Answer:
Therefore 2 mole H2O will have 2.4088×10^24 hydrogen atoms. one mole of water contains 6.02 x 1023 molecules of water. But each molecule of water contains 2 H and 1 O atom = 3 atoms, so there are approximately 1.8 x 1024 atoms in a mole of water.
What energy is associated with random motion of particles in a sample of gas.
Answer:
internal energy
Explanation:
Using the periodic table, choose the more reactive non-metal.
S or As
Answer:
More reactive non-metal is Sulfur (S).
Explanation:
what change is length of metals?
Answer:
Metal gets bigger when it gets hot.
Explanation:
Length, surface area and volume will increase with temperature, therefore its called thermal expansion.
Question 8 of 10
How can a solvent be separated from a solute by distillation?
A. The solvent is allowed to separate into layers.
B. The solution is absorbed onto a paper.
C. The solvent is collected as it is boilefmff.
ОО
D. The solution is poured through a filter.
SUBMIT
Answer:
the solvent is collected as it is boiled off.
Explanation
A solvent can be separated from a solute by distillation when the solvent is collected as it is boil.
What happen in distillation?When we heat up the solution so that liquid with the lowest boiling point evaporates first and collected in another container whereas leaving the other solutes behind.
So we can conclude that a solvent can be separated from a solute by distillation when the solvent is collected as it is boil.
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Which type of compound does not contain a carbonyl group?.
If you spill a liquid chemical, what is the first thing you should do?.
which of these molecules is nonpolar?
a.CH3CI
b.CO
c.O2
d.PF3
Answer:
i think the answer is D
Explanation:
Answer:
C: O2
Explanation:
Hope it helps
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How long did the Cambrian period last for?
Answer: 541 million to 485.4 million years ago
Explanation:
The chemical substances in food that contribute to health, many of which are essential parts of a dietary pattern, are called:.
The chemical substances in food that contribute to health, many of which are essential parts of a dietary pattern, are called nutrients.
What is Nutrients?Nutrients are chemical compounds in food that are used by the body to function properly and maintain health.
Examples includes:
Proteins, Fats, Carbohydrates, Vitamins, and Minerals.Learn more about chemical substances:
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Consider the reaction below. H2(g) CO2(g) Right arrow. H2O(g) CO(g) At equilibrium at 600 K, the following are true. [CO2] = 9. 5 x 10-4 M [H2] = 4. 5 x 10-2 M [H2O] = 4. 6 x 10-3 M [CO] = 4. 6 x 10-3 M What is the value of the equilibrium constant for this reaction in correct scientific notation? 4. 9 x 10-3 4. 9 x 10-2 4. 9 x 10-1 4. 9 x 103.
The value of the equilibrium constant for the reaction is [tex]4.9\;\times\;10^{-1}[/tex]. Thus, option C is correct.
The equilibrium constant for the reaction is given as the ratio of the concentration of product to reactant raised to the stoichiometric coefficients.
Computation for the equilibrium constantThe balanced equation for the reaction is:
[tex]\rm H_2\;+\;CO_2\;\to\;H_2O\;+\;CO[/tex]
The equilibrium constant (K) for the given reaction is:
[tex]K=\rm \dfrac{[H_2O]\;[CO]}{[H_2]\;[CO_2]}[/tex]
Substituting the values for the concentration of the reactant and product:
[tex]K=\dfrac{[4.6\;\times\;10^{-3}]\;[4.6\;\times\;10^{-3}]}{[4.5\;\times\;10^{-2}]\;[9.5\;\times\;10^{-4}]} \\\\K=0.49\\\\K=4.9\;\times\;10^{-1}[/tex]
The value of the equilibrium constant for the reaction is [tex]4.9\;\times\;10^{-1}[/tex]. Thus, option C is correct.
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Which type of external structure would most help an animal to camouflage?
A fur
B strong legs
C keen eyes
D wings
Answer:
c
Explanation:
Answer:
a fur
Explanation:
I took the test
A reaction is occurring in a test tube. How is heat transmitted to the surroundings?
A-As bubbles are formed and gas escapes, the heat is carried with the rising bubbles.
B-Molecules collide with the glass, and the glass molecules then transmit that energy to the outside.
C-Heat is carried out with matter as the matter is changed with the surroundings.
D-All of the heat escapes out of the open top of the test tube as molecules collide with the air.
It should be noted that when a reaction is occurring in a test tube, heat transmitted to the surroundings when Molecules collide with the glass, and the glass molecules then transmit that energy to the outside.
What is heat?Heat can be regarded as a form of energy which is energy that is been transferred as a result of difference in temperature.
In the case above, Molecules collide with the glass, and the glass molecules then transmit that energy to the outside which is an exothermic reaction.
Therefore, option B is correct.
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How does the author communicate that a liquid is similar to a gas?
The author communicate that a liquid is similar to a gas due to its indefinite shape.
How liquid and gas are similar?Gas and liquid are similar in one property which is that gas and a liquid is able to flow and take the shape of a container due to indefinite shape but both are different from one another due to the presence of definite volume of liquid which is not the property of a gas so we can conclude that indefinite shape is the property of both liquid and gas.
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Dimensional analysis can only be used for time, distance, mass, speed, volume, and chemical quantities.
Group of answer choices
True
False
Dimensional analysis can only be used for time, distance, mass, speed, volume, and chemical quantities: False.
What is dimensional analysis?A dimensional analysis can be defined as an analysis of the relationships that exist between different physical quantities by identifying their fundamental (base) quantities, especially for the purpose of inferences.
Dimensional analysis is also referred to as unit-factor method or factor-label method and it is typically used to convert a different type of unit to another.
Generally, dimensional analysis can only be used for the following physical quantities:
TimeDistanceMassVolumeSpeedIn conclusion, a dimensional analysis cannot be used for chemical quantities such as a mole i.e it has no dimensional formula.
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ASAP, the diagram shows the electron arrangement…
Which element does not form an covalent bond
Answer:
A doesn’t form a covalent bond
Explanation:
There is a couple different ways to determine if a bond is ionic or covalent. By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals.
The most malleable metal is _________
Answer:
Gold
.........
..........
Answer:
Gold
Explanation:
Gold is the known most malleable metal, as it is especially soft and can be stretched so much that it becomes transparent.
That is due to his unique composition, which makes its atoms very tightly packed together but at the same time they have the ability to “slide” past one another.
How many molecules of co2 are in a 500. 0 ml container at 780 mm hg and 135°c? 8. 76 × 1021 molecules 9. 23 × 1021 molecules 5. 50 × 1021 molecules 2. 65 × 1022 molecules 2. 79 × 1022 molecules.
Step 1:
ok we have to use the formula PV=nRT
p=Pressure (must be converted to atm)= 780 mmHg
1 amt= 760 mmHg use this as a conversion factor
780 mmHg (1 atm/760 mmHg)= 1.026
V= Volume= 5.00 mL = o.5 L
n=number of moles which we have to find first
R= 0.0821
T(convert to Kelvins by adding 273.15 to the celsius temperature)= 135 C + 273.15= 408.15 k
Now plug in->
(1.026 atm)(o.5 L)= n(0.0821)(408.15 K)
(1.026 atm)(0.5 L)= n(33.509115)
(0.513)= n(33.509115)
n(number of moles)= 0.01532 mol
Now we have to convert to moles using Avagodro's number which states that 1 mol = 6.022 x 10^23 molecules or atoms
So 0.01532 mol (6.022 x 10^23 number of molesules)/ (1 mol) = 9.225704 x 10^21 = 9.226 x 10^21 colecules
Step 2
You must transfer pressure into pascals, 780 mm Hg = 103991 Pa
135*C = 408.15 k
then from the equation pV = nRt
n = pV / RT (T in Kelvins, V in M^3)
n = 103991 x 500 x 10^-6 / (8.314 x 408.15)= 0.015322 moles of N2
1 mol of everything is 6.022 x 10^23 particles, so 0.15322 moles is 0.15322 x 6.022 x 10^23 = 9.2269084 x 10^21 molecules
Explanation:
Hope this helps :)
Are the following pairs of structures resonance contributors or different compounds?.
Answer:Determine whether the following pairs of structures are actually different compounds or simply resonance forms of the same
Explanation:
12pm MWF SEC 100 Professor Thomas Teets Units and Significant Figures 01-20-2016 Units: required to make a measurement have meaning; ALL MEASURED QUANTITES NEED UNITS SI Units to Know: Mass Kilogram (kg) Length Meter (m) Time Seconds (s) Temperature Kelvin (K) *NO degree symbol* Amount of substance Mole (mol) Prefixes to Know: Table R-2 in Textbook When these prefixes are added to units, it changes the size of that unit by the given amount (in multiples of 10 ) Mega (M)
evaluate the strengths and weaknesses of the different types of sunscreens
Answer:
sunscreens helps of nut burning and the weakness it has polymen so it's bas
What two structures in plant leaves help prevent the loss of water?.
Answer:
Upper cuticle and guard cells
Find the distance between two points rounding to the nearest tenth
(-7,-1) and (-4,3)
which element has the largest atom phosphorus, sulfur, chlorine, or fluorine
Answer:
Chlorine
Explanation:
It has the greatest mass out of the elements listed
Where does the radiation for the EM spectrum originate from?
Answer:
produced whenever a charged particle, such as an electron
Explanation:
Electromagnetic radiation is produced whenever a charged particle, such as an electron, changes its velocity—i.e., whenever it is accelerated or decelerated. The energy of the electromagnetic radiation thus produced comes from the charged particle and is therefore lost by it.
A welder has 1. 873 × 102 g Fe2O3 and 94. 51 g Al in his welding kit. Which reactant will he run out of first? Fe2O3 Al.
The reactant that run out first in the reaction is [tex]\rm Fe_2O_3[/tex].
The balanced chemical reaction for welding is:
[tex]\rm Fe_2O_3\;+\;2\;Al\;\rightarrow\;Al_2O_3\;+\;2\;Fe[/tex]
The balanced chemical equation gives the 2 moles of Al reacts with 1 moles of iron oxide.
Computation for limiting reactantThe reactant that exhausts prior in the reaction is known as limiting reactant.
The moles of a sample is given as:
[tex]\rm Moles=\dfrac{Mass}{Molar\;mass}[/tex]
The available moles of iron oxide is:
[tex]\rm Moles\;Fe_2O_3=\dfrac{ 1. 873\;\times\;10^2\;g}{159.69 \;g/mol} \\ Moles\;Fe_2O_3=1.1\;mol[/tex]
The available moles of iron oxide is 1.1 mol
The available moles of Al are:
[tex]\rm Moles\;Al=\dfrac{94. 51\;g}{26.9\;g/mol} \\Moles\;Al=3.5\;mol[/tex]
From the balanced chemical equation, for the reaction with 1 mole iron oxide 2 moles Al is required.
Thus, for the reaction with 1.1 moles Iron oxide, 2.2 moles Al is required.
The available moles of Al is more than the required, therefore, Al is the excess reactant and [tex]\rm Fe_2O_3[/tex] is the limiting reactant.
The reactant that run out first in the reaction is [tex]\rm Fe_2O_3[/tex].
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A burning splint will burn more vigorously in pure oxygen than in air because ________.
Answer:
oxygen is a reactant in combustion and the concentration of oxygen is higher in pure oxygen than it is in air.
A sample of argon gas is cooled and its volume went from 380 mL to 250 20 points
ml. If its final temperature was -55°C, what was its original temperature?
Answer:
Applying the Laws of Thermodynamics we get as,
Explanation:
V1/T1 = V2/T2
According to the law of Gaseous states.
so we get as,
V1 = 380 ml, V2 = 250 ml, T2 = -55°C ==> 273-55 ==> 218 Kelvin.
so now substituting we get as,
380/ T1 =250/218
==> 380*(218) /250 = T1
==> T1 = 331.36 ===>T1 = 331 K approx
So the Original Temperature was 331 K,
Option 1.) is correct.
As the force increases, the ________ increases, too.
Answer:
Pressure?
Explanation:
...........
Can someone please notice me explain the other parts such as the petal and receptacle do in the flower. Pretty please put in your own words I can’t use the internet so please use your own words
The receptacle or torus (an earlier name, thalamus, as in Thalamiflorae) is the thickened section of a stem (pedicel) from which the flower organs develop in angiosperms. The receptacle of some accessory fruits, such as the pome and strawberry, gives birth to the edible section of the fruit. Receptacle: The section of a flower stem to which the flower's components are connected. Sepal: The outer components of the flower that envelop a growing bud (typically green and leaf-like). Petals are the sections of a flower that are frequently brightly coloreda
molecule of oxygen (O2) has a speed of 473 m/s at a certain temperature. Determine the speed of the molecule in kilometers per hour (km/h).
Please show work.
You can use dimensional analysis to answer this question.
[tex]=\frac{473\ m}{1\ s}[/tex] × [tex]\frac{1\ km}{1000\ m}[/tex] × [tex]\frac{60\ s}{1\ min}[/tex] × [tex]\frac{60\ min}{1\ hour}[/tex]
= 1702.8 km/h
If you did this correctly, all your units should cancel out, leaving you with km/h
Molecules have been defined by the two or more elements joined chemically. The speed of oxygen molecules in kilometers per hour (km/h) will be 1702.8 km/h.
What is speed?Speed has been defined as the rate at which the particle or the object moves from one point to another. It has been defined as the pace that is given by the distance traveled by the object in a period of time.
The international system of Units (SI unit) for speed is m/s where the distance is in meters and time in seconds. The units from m/s are converted into Km/hr by dimensional analysis as:
Given,
Speed = 473 m/s
It is known that 1 m = 1 ÷ 1000 km
So, 473 m = 0.473 km
Similarly, 1 hour = 60 minutes
And 60 minutes = 3600 seconds
(0.43 km × 60 sec × 60 minutes) ÷ (1 sec × 1 minute × 1 hour)
= 1702.8 km/h
Therefore, the speed is 1702.8 km/h.
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What is the hydrogen ion concentration of a solution with ph = 2. 25?.
