Based on the intermolecular forces we can see that N2 will have the least boiling point and NaCl will have the highest boiling point.
An intermolecular force is an attractive force that arises between the positive components or also called as protons, of one molecule and the negative components that is the electrons of another molecule. Various physical and chemical properties of a substance are generally dependent on this force.
These forces are the weak attractive forces that keep the molecules together in a particular physical state.
The strength of these forces depends on the structure of the molecules of the substance and also on the nature of bonding between their atoms.
N2 is having London dispersion forces, NaCl = electrostatic forces, HBr = dipole dipole forces and HF = dipole dipole forces.
Since the boiling point of a substance increases with increasing strength of the intermolecular forces, we can say that N2 molecule has the least boiling point and NaCl has the maximum boiling point.
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One ounce of solution x contains only ingredients a and b in a ratio of 2:3. One ounce of solution y contains only ingredients a and b in a ratio of 1:2. If solution z is created by mixing solutions x and y in a ratio of 3:11, then 2520 ounces of solution z contains how many ounces of a?.
Then 2520 ounces of solution z contains ounces of a is 876 ounces.
given that ;
x contains a and b in the ratio = 2:3
y contains a and b in the ratio = 1:2
z contains the a and b in the ratio 3:11, that, means in 14 parts of solution.
therefore, 2520 ounces solution of z,
x = ( 2520 × 3 ) / 14 = 540
y = ( 2520 × 11 ) / 14 = 1980
x = 540 (2/5) = 216
y = 1980 / 3 = 660
thus, One ounce of solution x contains only ingredients a and b in a ratio of 2:3. One ounce of solution y contains only ingredients a and b in a ratio of 1:2. If solution z is created by mixing solutions x and y in a ratio of 3:11, then 2520 the ounces of solution of z = 876
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hydration of an alkyne c6h10 gave two ketones in approximately equal amounts which of the following alkynes would be expected to give these results
3-hexyne
1-hexyne
2-hexyne
3,3-dimethyl-butyne
The alkynes would be expected to give these results is 2 - hexyne.
The alkynes are the compounds which contains carbon triple bond carbon.
The 2- hexyne undergoes hydration forms two ketones . the reaction is given as follows :
CH₃CH₂CH₂C≡CCH₃ + H₂O ---->CH₃CH₂CH₂C=OCH₂CH₃ +
CH₃CH₂CH₂CH₂C=OCH₃
If the alkyne is symmetrical than the hydration product is single ketone product is formed. if the alkyne is asymmetrical than the hydration product is formation of two ketones takes place. so the the alkynes with from two ketones according to the given ques is 2 - hexyne. the terminal alkyne form only one ketone as a product.
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Using what you have learned about the nitrogen cycle, what do you predict are the o2 levels in the river?.
Low - The generation of nitrates (NO 3-) requires oxygen, so the oxygen levels will be low.
What predicts are the o2 levels in the river?.Nitrates are created when oxygen present in water reacts with ammonia. Not the oxygen in the water molecule, but rather the dissolved oxygen is the one that reacts with the ammonia. Aquatic animals breathe in this oxygen to survive. The formation of nitrates will result in a decrease in the amount of dissolved oxygen, which suffocates marine species and has a negative effect on them. This will also damage the ecosystem as a whole.Ammonia reacts with oxygen in water to generate nitrates. It is the dissolved oxygen, not the oxygen found in water molecules, that reacts with ammonia. Low - Oxygen will be in short supply because the production of nitrates (NO 3-) requires it.The complete question is :Nitrates are made by converting ammonia (NH3) to nitrite (NO2-) and then to nitrate (NO3-). What do you predict the O2 levels in the river will be? High - Nitrate (NO3-) contains more oxygen atoms than ammonia (NH3), so the O2 will be high. Normal - Even though oxygen atoms are added to nitrogen during the nitrogen cycle, the levels of O2 in the water will be normal. Low - The generation of nitrates (NO3-) requires oxygen, so the oxygen levels will be low.
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G proteins are a family of receptor proteins that are involved in transmitting signals from outside a cell to inside a cell. When a signaling molecule binds to a G protein, the G protein is activated. The G protein then activates an enzyme that produces a second messenger called cAMP.
Which of the following describes a critical role of cAMP during the transduction stage of a G protein signal transduction pathway?
cAMP results in the activation of an enzyme that amplifies the signal by acting on many substrate molecules.
cAMP results in the activation of an enzyme that amplifies the signal by acting on many substrate molecules.
This G protein - coupled receptor signaling mechanism involves the following events. When the ligand or first messenger binds to the receptor, the receptor changes its conformation and binds to the G protein complex. there is a molecular substitution in the Gα subunit GDP is replaced by a GTP. This replacement causes the activation of the Gα subunit. The active Gα subunit then separates from the β and γ subunits and moves laterally in the membrane to activate an effector. When the interaction is completed, the GTP bound to the Gα subunit is hydrolyzed back to GDP and dissociated from Gα.The two most common messengers are cAMP and calcium. This results in the activation of an enzyme.
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What happens to the reactivity left to right in a period?.
In a periodic table, reactivity falls off to the right. A tabular representation of the chemical elements is known as the periodic table, or periodic table of the (chemical) elements.
It is commonly regarded as an icon of chemistry and is utilized extensively in physics, chemistry, and other sciences. Down in periodic table, reactivity lessens. Because group 7 elements get an electron in reaction, this occurs. The quantity of electron shielding rises as you advance down the group, reducing the electron's attraction to the nucleus.
In a period, the reactivity of non-metals rises from left to right, whereas in a group, it falls as we move down the group because the propensity to take electrons declines. Is called as reactivity.
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The complete question is-
What happens to the reactivity left to right in a periodic table
what volume of a 0.189 m sodium hydroxide solution is required to neutralize 13.8 ml of a 0.171 m perchloric acid solution?
Volume of a 0.189 m sodium hydroxide solution is required to neutralize 13.8 ml of a 0.171 m perchloric acid solution is 80.42 L.
The balance chemical equation is given :
NaOH + HClO₄ -----> NaClO₄ + H₂O
given that :
molarity = 0.171 M
volume = 13.8 mL = 0.0138 L
moles of HClO₄ = molarity × volumes in L
= 0.171 × 0.0138
= 0.0023 mol
moles of HClO₄ = moles of NaOH
moles of NaOH = 0.0023 mol
volumes of NaOH = molarity / moles
= 0.189 / 0.00235
= 80.42 L
The volume of sodium hydroxide = 80.42 L.
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a gaseous hydrogen and carbon containing compound is decomposed and found to contain 74.98% c and 25.02% h by mass. the mass of 245 ml of the gas, measured at stp, was 0.879 g. what is the molecular formula of the compound?
The butene chemical formula is (CH2)4 = C4H8.
How do you calculate a compound's molecular formula?Examples of carbohydrates include glucose and sucrose. Sucrose is almost exactly twice as big as glucose, despite the fact that their empirical formulas are fairly close.Some people can tell the difference between them just on taste, but it is not advisable to stroll around tasting chemicals.The best way to tell glucose from sucrose is to find their molar masses because this makes it easy to distinguish between the two different substances.A molecular compound's formula specifies the kind and number of atoms of each element that are contained within it.The molecular formula and the empirical formula are frequently the same.The chemical formula will always be some integer multiple (n) of the empirical formula.Since the empirical formula for a molecule equals n, the molecular formula is equal to n.Divide the empirical formula mass, EFM, by the compound's molar mass, MM, to obtain the integer multiple, n.n=MM(molarmass)/EFM(empiricalformulamolarmass)The empirical and molecular formulas for methane, acetic acid, and glucose, as well as different n values, are compared in Table 6.9.1. Since methane only contains one carbon atom, its empirical formula, CH4, is also its chemical formula. The empirical formula and the molecular formula are sometimes merely multiples of one another, though. Acetic acid is the main organic acid found in vinegar. It has the chemical compound C2H4O2.Glucose, a simple sugar, serves as one of the primary sources of energy for cells. It has the chemical formula C6H12O6. They both have the same empirical formula, CH2O, despite the fact that they are quite different molecules.Example
100 g of gas are used.
C = 85.63 g / 12 g/mol = 7.1358 mol when the proper atomic mass is divided by it.
H = 14.37g/1g/mol = 14.37mol
C = 1 and H = 2 divided by smaller division
Data formula for empirical research: CH2
The volume of one mole of gas is 22.4 L at STP, or 22 400 mL.
22400 mL divided by 258 mL and 0.646 g, or 56.868 g/mol, is the gaseous mass per mole.
CH2 mass in formula equals 14g/formula units in 1 mol, which is equal to 56.868 g/mol/14g/formula unit, or 4formula units per mol.
(CH2)4 = C4H8 is the butene chemical formula.
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What is the use of Brainly?.
Brainly is a platform where students, parents, and teachers can assist others with their homework questions. The website is designed to help students improve their skills in subjects such as English, mathematics, science, and social studies.
"Brainly is an excellent website for getting assistance with any homework assignment." There is a wonderful community that responds to your questions promptly, as well as a community of moderators who keep the site safe for all users." Free Homework Help- Brainly Basic is completely free! 24/7 Homework App - Unrestricted access, anywhere and at any time. Superfast, Homework Answers and Explanations - Questions are answered in minutes and moderated.
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Answer:
to help you find answers to your questions.
Explanation:
What is the function of the thick albumen in an egg?.
The function of the thick albumen in an egg is it provides the liquid medium to which the embryo develops. it serve to keep yolk in center.
The albumen consist of the 4 layers that thick and in thin consistencies. the yolk outward, they are designated. the thinner thick layer is chalaziferous white. the albumen provide the liquid medium in which the embryo develops it contains the large amount of the protein that is very necessary for the proper development in the egg. the fresh egg contain white cords attached to the yolk sac.
Egg albumen contains essential amino acids and full of protein.
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the index of refraction of carbon tetrachloride is 1.461. determine the speed of light in carbon tetrachloride.
Carbon tetrachloride has a refractive index of 1.461. In carbon tetrachloride, light will travel at a speed of 2.05 x 108 m/s.
What is the purpose of carbon tetrachloride?
Carbon tetrachloride, sometimes known as carbon tet, is an odorless, colorless liquid that is non-flammable. Prior to 1970, both commercial and domestic usage of carbon tet as a cleaning agent was common. The substance was employed as just a grain fumigant up to 1986. The production of rocket fuel and other industrial compounds still uses carbon tet.
Does carbon tetrachloride harm people?
The kidneys and liver could be gravely harmed by breathing carbon tetrachloride. Other side effects include fatigue or lightheadedness, headache or vertigo. Some individuals who breathe carbon tetrachloride appear confused. Additionally, vomiting and stomach pain might result from breathing carbon tetrachloride.
Briefing:
c = 3 x 10^8 m/s
μ = c / v
where, μ is the refractive index, c be the velocity of light in air and v be the velocity of light in the medium.
μ = 1.461
1.461 = 3 x 10^8 / v
v = 3 x 10^8 / 1.461
v = 2.05 x 10^8 m /s
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Is alcohol free a trend?.
People drink them carefully. And that has completely changed now. The non-alcoholic trend started a year or two before the pandemic. Non-alcoholic bars have sprung up in some cities for the so-called sober curious and continue to grow at a rapid pace.
This category is growing not because the consumer suddenly decides to quit alcohol, but because the consumer who drinks alcohol wants his NA option which tastes great like Heineken 0.0 in his life. It's because he's found it fits the style he said Manso Salinas. The term alcohol-free can only be used in the United States if the product does not contain detectable alcohol.
Can lead to traffic accidents violence alcoholism and other health problems. Drinking at a young age greatly increases the risk of developing alcohol problems later in life. Talking openly to children about the dangers of alcohol use early on can help prevent them from developing drinking problems.
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For which of these sets of data would all the points be displayed on a scatterplot if the window size on a regression calculator were set to 5 less-than-or-equal-to x less-than-or-equal-to 15; 25 less-than-or-equal-to y less-than-or-equal-to 75?
Answer:
This is the correct answer:
The table with the following:
X=6,7,9,11,13,14
Y=27,33,39,49,58,71
Lol, I didn't realize that was all this was.
Anyways, the table that matches that is correct, that's actually a bit obvious. The numbers you gave me are parameters, a limit. The numbers for x per y have to fall between those numbers listed.
1. which material property of glasses allows them to be expanded to large dimensions by blowing (i.e. bottle making)? can metals undergo such behavior as glass?
The ability of glass to behave in some kind of a superplastic manner and to experience extremely large uniform elongations above high temperatures is a feature that makes it possible to produce bottles.
A material? What would you mean by that?The term "material" describes something that is used to create another item. Cloth or any other item formed of matter that exists throughout the physical world can be referred to as material. As just a noun and also an adjective, "material" has several more meanings.
What kinds of materials are there?Metals, polymers, plus ceramics are the three main categories of materials. Steel, fabric, and ceramics are a few examples of them. These classes often have quite distinct origins, traits, and uses.
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Manganese metal can be prepared by the thermite process:
4Al(s)
+
3MnO2(s)
→
3Mn(l)
+
2Al2O3(s)
If 175 g of Al and 472 g of MnO2 are mixed, how many moles of Mn could be produced from the reaction?
Relative Atomic Mass Data: Ca = 40; Mn = 55; I = 127; Li = 7; Ag = 108; Al = 27; Na = 23; H = 1; K = 39; Br = 80; N =14; O =16; Cl = 35
Manganese metal can be prepared by the thermite process as it is the limiting reactant.
What is the balanced equation for the reaction?The balanced equation for the reaction. This is given below:
[tex]4Al(s) + 3MnO2(s) — > 3Mn(l) + 2Al2O3(s)[/tex]
Determination of the masses of [tex]Al[/tex] and [tex]MnO2[/tex] that reacted from the balanced equation. This is illustrated below:
Molar Mass of Al = 26.98g/mol
Mass of Al from the balanced equation = 4 x 26.98 = 107.92g
Molar Mass of MnO2 = 86.94g/mol
Mass of [tex]MnO2[/tex] from the balanced equation = 3 x 86.94 = 260.82g
From the balanced equation above,
107.92g of Al reacted with 260.82g of MnO2 reacted.
Determination of the limiting reactant. This is illustrated below:
Let us consider using all the 203g of Al given to verify if there will be any leftover for [tex]MnO2.[/tex] This is illustrated below:
From the balanced equation above,
107.92g of Al reacted with 260.82g of MnO2,
Therefore, 203 g of Al will react with = (203 x 260.82)/107.92 = 490.61g of [tex]MnO2.[/tex]
Therefore, Manganese metal can be prepared by the thermite process as it is the limiting reactant.
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Why you should not store fruit juices in a pewter pitcher?.
Because even little amounts of the natural acids present in some meals can cause metal to pit or discolor, it is not advised to use pewter as a food container.
What is the purpose of a pewter pitcher?Elegant pewter pitchers are excellent for serving iced tea, iced water, or even wine. We make each of handmade pewter pitchers using techniques that have been in use for generations. They are lead-free and food-safe, just as all other our pewter goods are.
Are pewter pitcher secure?Modern pewter is safe to use and lead-free. It is mostly comprised of tin, with some copper and antimony. The goods have been guaranteed lead-free and perfectly safe to be used for all types of food and drink, according to one maker.
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What is the charge of an atom if it loses 3 electrons?.
gizmo warm-up a chemical change, (or chemical reaction) occurs when one or more substances, called reactants, are transformed into different substances, or products. in the chemical changes gizmo, you will look for evidence of chemical changes by looking at changes you can see, touch, or smell. to begin, check that reactant 1 is sodium and reactant 2 is water. sodium is a metal so soft you can cut it with a knife. click play (). what do you observe? the mass increased science. we took sodium and added it to the water. do you think a chemical reaction has taken place? explain.
When water and sodium react, caustic soda (NaOH) and hydrogen gas are produced.
Reaction of sodium and waterWater-insoluble hydrogen gas is formed and enters the atmosphere, so bubbles are observed coming out of the water when sodium reacts with it.
reaction product
Metallic sodium reacts rapidly with water to form caustic soda (NaOH) and hydrogen gas (H2). Since this chemical reaction is an exothermic reaction in which a large amount of heat is released from the solution, we can conclude that sodium hydroxide solution and hydrogen gas are formed by the reaction of water and sodium.
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fluorine gas and water vapor react to form hydrogen fluoride gas and oxygen. what volume of hydrogen fluoride would be produced by this reaction if 3.05 ml of water were consumed? also, be sure your answer has a unit symbol, and is rounded to 3 significant digits.
Fluorine gas and water vapor react to form hydrogen fluoride gas and oxygen. The volume of hydrogen fluoride produced by a reaction if 3.05 ml of water were consumed is 6.10 ml.
The balanced reaction between fluorine gas and water vapor is
2F₂(g)+2H₂O(g)→4HF(g)+O₂(g)
To find out the volume of hydrogen fluoride produce, we need to use Avogadro's law equation which is given as
V₁/n₁=V₂/n₂
Where, V₁=3.05 ml, n₁=2, n₂=4, V₂=?
Rearrange the formula for V₂
V₂=(V₁×n₂/n₁)
Plug all the values in the formula
V₂=(3.05 ml×4/2)
V₂=12.2 ml/2
V₂=6.10 ml
Therefore, the volume of hydrogen fluoride(HF) produced by the reaction if 3.05 ml of water were consumed is 6.10 ml.
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ethnopharmacology is a subdiscipline in the field of ethnomedicine. identify what someone within the ethnopharmacology field might do during their res
jot down the varieties of teas and herbs that may be found in a traditional chemical pharmacy, ask amchis what plants they use to make their medicinal products, is referred to as ethnopharmacology.
There are essentially only two parts to a traditional chemical pharmacy. A formula, which denotes the creation of a new medicinal by combining two or more ingredients, is different from a single medicinal, which refers to one specific chemicals. Ethnopharmacology focuses on the exchange of knowledge and understandings about how people use plants, fungi, animals, microbes, minerals, and their biological and pharmacological effects based on the standards established by international treaties. With the exception of vegetables and other plants used for macronutrients, herbs are a commonly used and prevalent group of plants. Is called as ethnopharmacology.
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A student decides to conduct an investigation to determine the boiling points of water and ethanol. The student will heat samples of water and ethanol, and measure the temperature at which the samples boil. The student will conduct the investigation three times. Which aspect is missing from the experimental design?(1 point).
Answer: deciding on the appropriate equipment
A student prepares 100 mL of a 0.10 M solution of sulfadiazine The molecular weight of sulfadiazine is 250 g/mol. What volume of a 0.25M potassium hydroxide solution is needed to deprotonate 50% of the solution of sulfadiazine?
It can be summed up as the mass of solute dissolved in a 100 mL volume of solution. Therefore, 75 g of NaOH would be present in 300 ml of a $25 (m/v) NaOH solution.
Caustic Soda Solution (NaOH 50%) Caustic Soda Solution is a clear, flavorless, odorless liquid that has a slight viscosity. Any ratio results in its miscibility with water. Caustic soda solution reacts strongly with alkaline and is extremely corrosive to a variety of materials.
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Now consider the difference in the types of charges formed by na and cl. What is the charge of the ions formed by na and by cl?.
The ions formed by Na and by Cl is Na forms a +1 ion, and Cl forms a -1 ion.
What is ions?
An molecule or atom with such a net electrical current is known as an ion. Conventionally, the charge of the an electron is thought to be negative; this charge is equal to and opposite to a charge of the a proton, which would be thought to be positive. Because the total amount of electrons in an ion is greater than the total number of protons, the net charge of the an ion is not zero. A negatively charged ion called an anion has more protons than electrons compared to a chloride ion called a cation. Electrostatic force causes opposite electric charges to be drawn towards one another, causing cations and anions to attract one another and easily form ionic compounds.
Na forms a +1 ion, and Cl forms a -1 ion.
This is because Na has one valence electron and Cl has 7 valence electrons.
When Na loses its valence electron it becomes a +1 ion, and when Cl gains one more electron it becomes a -1 ion.
This is due to the fact that Na has a lower electronegativity than Cl, and thus is more likely to lose an electron in a chemical reaction.
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Estimate the change in enthalpy and entropy when liquid ammonia at 270K is compressed from its saturation pressure of 38/ kPato 1200 Wa. For saturated liquid ammonia at 270K,Vl=1.551×10−3m3kg−1, and β=2.095×10−3K−1.
The change in enthalpy and entropy when liquid ammonia at 270 K is compressed from its saturation pressure of 381 KPa to 1200 KPa (in the question / and w are the typo mistakes) will be -2.66 × 10⁻³ KJ/Kg.K
Initial volume (V1) = 1.551 × 10⁻³ m³Kg⁻¹
β = 2.095 × 10⁻³K⁻¹
ΔH = CpΔT + [V-T(ΔV/ΔT)]ΔP
ΔS = CpΔT - (ΔV/ΔT)p ΔP
For isothermal conditions
ΔH = [V-T(ΔV/ΔT)]p ΔP
ΔH = V - (1 - βT) ΔP
Let V and β constant
ΔH = V (1 - βT) ΔP
ΔH = 1.551 × 10⁻³ m³Kg⁻¹ [1 - ( 2.095 × 10⁻³ × 270)] (1200 - 381)
ΔH = 0.557 KJ/Kg
Now calculate dS
ΔS = -(ΔV/ΔT)p ΔP = - βV ΔP
ΔS = βV ΔP
ΔS = -1.55 × 10⁻³ × 2.095 × 10⁻³ (1200 -381)
ΔS = -2.66 × 10⁻³ KJ/Kg.K
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Complete the equations to show how 1-phenylcyclopentene can be synthesized from cyclopentanol. Part 1 Select all the suitable oxidizing agents for the previous reaction. A. LiAlH4 in diethyl ether, then H2O B. PCC in CH2Cl2 C. H2 and a Pt, Pd, Ni, or Ru catalyst D. NaBH4 in CH3OH 1. H2CrO4 generated from Na2Cr2O7 in aqueous sulfuric acid
The appropriate oxidizing agents for the preceding procedure are PCC in CH2Cl2 and H2CrO4 produced from Na2Cr2O7 in aqueous sulfuric acid. demonstrating the ability to manufacture 1-phenylcyclopentene
The organic compound 1-phenylcyclopentene has the chemical formula CH3C5H9. It is a colourless, combustible liquid with a light scent. It belongs to the petroleum fraction called naphthene which is oxidizing agent. The most common way to get it is in a combination with cyclohexane. It is primarily transformed to benzene in naphthene reformers.
Since it is not exactly planar, the C6 core of 1-phenylcyclopentene has the ability to pucker and reduce structural stress. Through a chemical reaction, 1-phenylcyclopentene is created when cyclopentanol is oxidizing to yield cyclopentanone. This is the method used to make 1-phenylcyclopentene.
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From the following list of observations, select the one that best supports the idea that electromagnetic radiation has the properties of particles. Explain your reasoning.
(a) Black-body radiation.
(b) Electron diffraction.
(c) Atomic spectra.
(d) The photoelectric effect.
Photoelectric effect. So in the experiment, a certain light (i.e. EM radiation) was used to attempt to eject an electron from a metal. If light were a wave, then simply increasing the intensity would increase the energy. However, increasing the intensity of the light did not result in ejection. Only changing the type of light (lower wavelength) worked. This proves light's particle properties. Increasing intensity just increases the number of particles, nothing more. The right energy is needed before intensity becomes a factor. Hope this helped.
The photoelectric effect best supports the idea that EMR has the properties of particles. To explain the photoelectric effect, Einstein proposed that EMR consists of particles (or packets of energy called photons, each photon having a energy equal to hv.
The following list of observations, select the one that best supports the idea that electromagnetic radiation has the properties of particles : The Photoelectric effect.
The photoelectric effect best supports the idea of the electromagnetic radiation. In the photoelectric effect the electromagnetic radiation falls on the metal surface and the emission of electrons or ejection of electrons takes place. to explains the photoelectric effect Einstein says that EMR consist of the particles called ad the packets of energy or called as the photons. the energy of each photons is given as : hv.
Thus, The following list of observations, select the one that best supports the idea that electromagnetic radiation has the properties of particles : The Photoelectric effect.
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why do reactions of the alkaline earth metals differ from those of the Group 1 metals?
Answer:
Alkaline earths have larger lattice energies than alkali metals due to small size and high charge. Hence, alkaline earth metal hydroxides have lower solubility than alkali metals.
Answer:
hope this will help youExplanation:
alkaline earth metals have two valance electrons whereas group 1 metals(Alkali metals) have one valance electrons.so, it takes more energy to remove two valance electrons from an atom than one valance electrons.therefore the reactions of the alkaline earth metals are differ from those of the group 1 metals( Alkali metals).Does albumin have a quaternary structure?.
Yes, albumin have quaternary structure.
The egg white contains large number of protein called albumin. the four level of protein structures are : primary , secondary , tertiary , quaternary structure. the proteins are made up of single polypeptide chain . the some of proteins are made up of multiple polypeptide chain called as subunits. these subunit together for the protein structure called as the quaternary structure. the same type of the interaction which is tertiary are formed are present in between the subunits that form the quaternary structure.
Thus, the protein formed by the polypeptide chain called albumin have quaternary structure.
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a pure sodium rystal 100g sits inn a steel cup. one drop watre is added. hydrogen gas is produced. what else happens. explain as
The reaction is: Na + H20 --> [tex]\frac{1}{2}[/tex]H2 + NaoH
ΔHr = (-1)(-285.84)+1(-425.9)
=-140KJ/gmol
1ml water = 1g water = 0.056gmol . 100gNa = 4.35gmoles
If water reacts, about 4.35 - 0.056 = 4.29gmol
or about 98.7g of Na remain.
The heat capacity of Na is 28J/gmol°C
The energy blance is :
(-140) × 0.056 + (4.29) × 28 ××ΔT=0
ΔT = 65°C
The heat is released up on reaction is sufficient to warm the Na metal up by about 65°C or to about 85-90°C from room temperature.This may be enough to cause the hydrogen °gas to expolde.
Hence above given is a correct answer.
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observe: some chemical reactions release heat, and others absorb heat. in an exothermic reaction, heat is released and the temperature of the system rises. in an endothermic reaction, heat is absorbed and the temperature of the system decreases. to remember: exo-thermic
The statement ' some chemical reactions release heat, and others absorb heat. In an exothermic reaction, heat is released and the temperature of the system rises. In an endothermic reaction, heat is absorbed and the temperature of the system decreases' is true.
In the field of science, an exothermic reaction can be described as such a reaction in which heat is released. On the other hand, an endothermic reaction is such a reaction in which heat is absorbed from the environment.
As heat is released into the atmosphere, the temperature will rise for an exothermic reaction. On the other hand, as heat is taken, the temperature of the surrounding atmosphere will lower for an endothermic reaction.
The question will correctly be written as:
observe: some chemical reactions release heat, and others absorb heat. in an exothermic reaction, heat is released and the temperature of the system rises. in an endothermic reaction, heat is absorbed and the temperature of the system decreases. Is the observation true or false?
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calculate the total concentration, in molarity, of hydroxide ions when 1,186.8 milligrams of gold(iii) hydroxide are completely dissolved into 0.154 l of 1.76 x10-1 m naoh. assume the added solute does not contribute significantly to the total volume. Report your answer to three significant digits.
The correct answer is 0.292 M.
Molarity or molar concentration is the number of moles of solute per liter of solution or molarity can be defined to be as number of moles of solute in volume of solution.
Mass of Gold(III) hydroxide = 1.1868 g
Moles of gold(III) hydroxide = mass of Au(OH)₃ / Molar mass of Au(OH)₃
Moles of Gold(III) = 1.1868/247.98 = 0. 004 moles
Moles of hydroxide ion from Au(OH)₃ will be,
Au(OH)₃ ⇔ Au³⁺ + OH⁻
Here,
if 1 mole of Au(OH)₃ gives 3 moles of OH⁻ ion then,
0.006 moles of Au(OH)₃ will give,
= 3 x 0.006 moles of OH⁻ ions
= 0.018 moles of OH⁻ ions
Again,
NaOH ⇔Na⁺ + OH⁻
Since, [OH⁻] = [NaOH] = 1.76 x 10⁻¹ = 0.176 M = molarity.
Hence, the moles of OH⁻ = Molarity of OH⁻ x VH of OH⁻
= 0.176 M x 0.154L
= 0.0271 moles
Now, total moles of OH⁻ will be
= OH⁻ from Au(OH)₃ + OH⁻ from NaOH
= (0.018 + 0.0271) moles
= 0.0451 moles of OH⁻
To find the concentration of hydroxide ion, we need to just apply the formula of molarity:
[OH⁻] = moles of OH⁻ / Volume of the solution
= 0.0451 / 0.154
= 0.292 M
Therefore, the the total concentration of hydroxide ion, in molarity is 0.292 M.
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