Answer:
m = 50.74 kg
Explanation:
We have,
Initial temperature of water is 20 degrees Celsius
Final temperature of water is 46.6 degrees Celsius
Heat absorbed is 5650 J
It is required to find the mass of the sample. The heat absorbed is given by the formula ad follows :
[tex]Q=mc\Delta T[/tex]
c is specific heat of water, c = 4.186 J/g°C
So,
[tex]m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{5650}{4.186\times (46.6-20)}\\\\m=50.74\ kg[/tex]
So, the mass of the sample is 50.74 kg.
Answer my question please
Answer:
Explanation:F
This is how osmium appears in the periodic table. Rounded to the nearest whole number, how many neutrons, on average, are in an atom of osmium?
76
114
190
266
Answer:
114
Explanation:
bottom number minus top number. just did the test
4. Which of these metals is a pure element? Brass Bronze Silver Steel 5. C is the correct chemical symbol for ....... Calcium Carbon Chlorine Cobalt 6. Which of these substances is an element? Air Fire Oxygen Water
Answer:
4) Silver
5) Carbon
6) Oxygen
Answer:
4) Silver (Rest are alloys)
5) Carbon (It stands for C)
6) Oxygen (Rest of them are either compounds or mixtures)
Why does sugar mix more in hot water than in cold water?
Answer:
this is because hot water has more energy than cold water
Use the information in the square to answer the questions about copper. A purple box has C u at the center and 29 above. Below it says copper and below that 63.55. How many protons are in an atom of copper? How many electrons are in an atom of copper? How many neutrons are in an atom of copper? Round your answer to the nearest whole number.
Answer:
29 protons
29 electrons
35 neutrons
Explanation:
Answer:
29
29
35
Explanation:
write 5.5 x 104 in standard form
Answer: 55,000
Explanation:
Scientific Notation: 5.5 x 10⁴
Standard form: move the decimal 4 places to the right
5 5 0 0 0 0.
= 55,000
Answer:
5.72×10^2
Explanation:
5.5×104
=55×104
=5720÷10
=572
=5.72×10^2
piece of copper iron silver and gold are dropped into a solution of iron sulphate the piece that will get a coating of a copper is known as
Pieces of copper, silver and gold are dropped into a solution of iron sulphate. The piece that will get a coating of copper is. ... Therefore, none of the three metals can displace iron from its salt solution. Hence, we observe that no reaction takes place and none of the pieces get coated.
Answer:
If it were a piece of iron dropped into a copper sulfate solution, precipitated copper would coat the iron
The solute will dissolve quicker if the solute is more shaken. saturated. cooled. settled. HELP 14 POINTS
Answer:
I believe the answer is A: shaken
Explanation:
The solute will dissolve quicker if the solute is more shaken.
What is solute?A solute is a substance that can be dissolved by a solvent to create a solution. A solute can come in many forms. It can be gas, liquid, or solid.
The solvent, or substance that dissolves the solute, breaks the solute apart and distributes the solute molecules equally. This creates a homogenous mixture, or solution that is equal throughout.
Solutes in solution are measured by their concentration. The concentration of a solute is the amount of solute divided by the total volume of solution.
A solvent can dilute various amounts of solute, depending on how strong of a solvent is used and how easily the solute molecules come apart. This property of solutes to dissolve in a solvent is known as solubility.
Therefore, The solute will dissolve quicker if the solute is more shaken.
To learn more about solute, refer to the link:
https://brainly.com/question/1616939
#SPJ3
When seeds germinate, roots grow downward and stems grow upward in response to gravity. This response to gravity is called _______.
Answer:
geotropism/gravitropism
Explanation:
Exponatial notation is used for a/ writing very small numbers b/writing very large numbers c/avoid tedious work d/all above
Answer:
The correct answer is option d/ "all above".
Explanation:
Exponential notation is a way of expressing mathematical equations by simplifying numbers that could be very small or very large. The number included within the exponential notation (the exponent) describe how many times the number included in the base is multiplied. If the exponent is an integer the number is very large, while if the exponent is a ratio the number is very small. This avoids the tedious work of writing the complete number that results from the exponential multiplication.
What volume (in liters) does 2.895 moles of oxygen occupy at stp?
Answer:
64.9 L
Explanation:
pls mark as brainliest
Name the first 20 elements of the pereodic table
Answer:
alkali metals hydrogen lithium sodium potassium rubidium cesium francium alkaline earth metals beryllium magnesium calcium strontium barium radium group 3 boron aluminium gallium indium thalium carbon family carbon silicon germanium tin lead
Explanation:
i hope this will help you :)
There's Hydrogen and Helium
Then Lithium, Beryllium
Boron, Carbon everywhere
Nitrogen all through the air
With Oxygen so you can breathe
And Fluorine for your pretty teeth
Neon to light up the signs
Sodium for salty times
Silicon
(Phosphorus, then Sulfur) Chlorine and Argon
(Potassium) And Calcium so you'll grow strong
(Scandium) Titanium, Vanadium and Chromium and Manganese
This is the Periodic Table
Noble gas is stable
Halogens and Alkali react aggressively
Each period will see new outer shells
While electrons are added moving to the right
Iron is the 26th
Then Cobalt, Nickel coins you get
Copper, Zinc and Gallium
Germanium and Arsenic
Selenium and Bromine film
When an electron moves from a lower to a higher energy level, the electron _____.
A. moves closer to the nucleus
B. absorbs a continuously variable amount of energy
C. always doubles its energy
D. absorbs a quantum of energy
Answer:
When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. So B.
Explanation:
When an electron moves from a higher to a lower energy level, energy is released (often as light).
When an electron moves from a lower to a higher energy level, the electron absorbs a quantum of energy (Option D).
When an electron moves from a lower to a higher energy level, the electron:
A. moves closer to the nucleus. FALSE. It moves farther from the nucleus since lower energy levels are closer to it.
B. absorbs a continuously variable amount of energy. FALSE. According to the quantum theory, it absorbs a discrete (not continuously variable) amount of energy.
C. always doubles its energy. FALSE. The increase in the energy depends on the energy of the quantum absorbed.
D. absorbs a quantum of energy. TRUE. This is stated by the quantum theory.
When an electron moves from a lower to a higher energy level, the electron absorbs a quantum of energy (Option D).
You can learn more about energy levels here: https://brainly.com/question/3473333?referrer=searchResults
An element has an electron arrangement of 2,8,1. Which group does it belong to?
Answer:
group 1
Explanation:
because it is an Alkali metal
A sample of wood with a mass of 30 g has its
temperature changed from 10° to 45° C. In the
process, it releases 90 J of heat. What is its specific
heat?
Answer:
0.086J/g°C
Explanation:
The following data were obtained from the question:
Mass (M) = 30g
Initial temperature (T1) = 10°C
Final temperature (T2) = 45°C
Change in temperature (ΔT) = T2 – T1 = 45°C – 10°C = 35°C
Heat (Q) released = 90J
Specific heat capacity (C) of wood =..?
We can obtain the specific heat capacity of the wood as follow:
Q = MCΔT
90 = 30 x C x 35
Divide both side by 30 x 35
C = 90/(30 x 35)
C = 0.086J/g°C.
Therefore, the specific heat capacity of the wood is 0.086J/g°C.
What does biodiversity mean?
Having as wide a range of organisms as possible
Having as narrow a range of organisms as possible
Species at risk of extinction
Answer:
Having as wide a range of organisms as possible.
Hope it helps! :)
Answer:
Having as wide a range of organisms as possible
Explanation:
Just saying I learned this at school in geography.
What happens if atoms lose energy during a change of state? The atoms are pushed apart by repulsive forces and become less organized. The atoms are pulled together by attractive forces and become less organized. The atoms are pushed apart by repulsive forces and become more organized. The atoms are pulled together by attractive forces and become more organized.
Answer:
The atoms are pulled together by attractive forces and become more organized.
Explanation:
According to the gas laws, the temperature is the measure of the average kinetic energy of the atoms of a molecule. State of change is primary driven by energy gain or loss. When molecules absorb energy, they transit into a phase in which their atoms are more mobile and move about more freely, staying relatively from, one from the other. When there is loss of energy, the molecules change into a less mobile state in which their atoms move with lesser energy, and stay relatively closer to each other than they were.
During a the process in which atoms lose energy, its atoms are pulled together by the attractive force, and become more organised, since they now possess less kinetic energy.
Answer:
The answer is D: The atoms are pulled together by attractive forces and become more organized.
Explanation: I just took the test and I got the answer write.
I hope this is right for you guys too!
Give examples of partially miscible liquids.
Answer:
honey and water, butanol and water, and potassium chloride and water.
Explanation:
Answer:
A pair of liquids, like 1-butanol and water, which separates into two layers, but still partially mix, is said to be partially miscible.A pair of liquids is considered partially miscible if there is a set of compositions over which the liquids will form a two-phase liquid system. ... And then at some temperature (known as the upper critical temperature), the liquids become miscible in all compositions.Some examples of miscible solutions include water and organic compounds such as alcohols, aldehydes and ketones. Immiscible solutions include water and many types of oils. A miscible solution is any solution that can be mixed together to form one liquid phase.This idea of solubility can be extended to the interactions between two liquids. If two liquids with similar polarities (and, therefore, similar intermolecular interactions) are combined, the liquids are said to be miscible with each other because the will mix to form a homogeneous solution.
Describe 4 differences between short chain hydrocarbons and long chain hydrocarbons and explain how this determines their uses
Ill give brainliest
Answer:
The term HYDROCARBONS means organic compounds which contain only carbon and hydrogen. By using this definition, four classes of hydrocarbons are included: alkanes, alkenes, alkynes and aromatic.
Hydrocarbons are organic compounds composed of only carbon and hydrogen. The alkanes are saturated hydrocarbons—that is, hydrocarbons that contain only single bonds. Alkenes contain one or more carbon-carbon double bonds.
The amino acid Prolinehas a pk1 of 1.99, pk2 of 10.60. The amino acid Serine has pk1 of 2.21 and a of pk2 of 9.15. If these two amino acids bind together by peptide bond creating the peptide sequence Pro-Ser . What will be the overall charge of this peptide at the physiological pH of 7?
a) overall charge will be neutral
b) overall charge will be neutral on Pro and negatively charged on the Ser
c) overall charge will be negative
d) overall charge will be positive due to the presence of the peptide bond
Answer:
a) overall charge will be neutral.
Explanation:
The Ph value for Pro will be neutral and neutral charge on the Ser. Molecules of atoms generally have neutral electrical charge. If the overall charge of a peptide is negative then it is considered as negative. Pro and Ser amino acids have neutral Ph values.
What is Chromatography?
Answer:
Chromatography is the separation of a mixture by passing it in solution or suspension or as a vapor. It's mainly used for separation and analytical study of organic and inorganic mixtures.
Hope this helps :)
Answer:
Chromatography is a laboratory technique for the separation of a mixture. The mixture is dissolved in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase.
Explanation:
Which of the following is sold on a commodity market A. bicycles B. Wool C. Sweaters D. Jewelry
Answer:
wool
Explanation:
this is because wool is used in manufacturing clothes and other materials for human use.
The structures of four organic compounds are shown below. Which statement is not correct?
A. Only one of the compounds is an alcohol.
B. Only one of the compounds is an alkane .
C. Only one of the compounds is unsaturated
D. Only three of the compounds are hydrocarbons.
Answer:
Option B. Only one of the compounds is an alkane
Explanation:
To know which option is wrong us, we simply determine the class to which each diagram belongs.
Diagram 1:
CH4 is called methane and it is a member of the alkane series which are saturated hydrocarbon.
Diagram 2:
CH3CH3 is called ethane and it is a member of the alkane series which are saturated hydrocarbon.
Diameter 3:
CH2=CH2 is called ethene and it is a member alkene series which are unsaturated hydrocarbon.
Diagram 4:
CH3CH2OH is called ethanol which is a member of the alcohol family. CH3CH2OH is also a saturated alcohol as it only contains single bonds.
From the above, we can see that:
1. Only one compound is alcohol i.e CH3CH2OH.
2. There are two members of the alkane series i.e CH4 and CH3CH3.
3. Only one compound is unsaturated i.e CH2=CH2. Unsaturated compound has one or more double bond.
4. Only three compounds are hydrocarbon i.e CH4, CH3CH3 and CH2=CH2. Hydrocarbons are compounds containg only carbon and hydrogen.
Therefore, option B is wrong as there are two members of the alkane present.
An ionic bond occurs between what particles?
two negative ions
a positive and negative ion
two positive ions
two neutral atoms
Answer:
A positive and a negative ion.
Explanation:
Consider these two electron configurations for neutral atoms L and M.
L - 1s22s22p63s2
M - 1s22s22p63s13p1
What is the difference between atom L and atom M?
One of the 2p electrons in L has jumped to an excited state
One of the 3p electrons in L has jumped down to a lower energy state
One of the 3s electrons in M has jumped to an excited stat
One of the 3p electrons in M has jumped down to a lower energy state
Answer:
The 3p electron in M has jumped down to a lower energy state
Explanation:
L - 1s² 2s²2p⁶ 3s²
M - 1s² 2s²2p⁶ 3s3p
L and M have the same number of electrons, so they are atoms of the same element.
Atom M is an excited state of atom L.
Either atom L has been excited to atom M or atom M has dropped to the ground state to form atom L.
A is wrong. Both atoms have two 2p electrons.
B is wrong. Atom L has no 3p electrons.
C is wrong. The 3s electron of atom L is already in its lowest energy state.
How many of the following are true concerning balanced chemical equations? I. The number of molecules is conserved. II. The coefficients for the reactants tell you how much of each reactant you are given. III. Atoms are neither created nor destroyed. IV. The coefficients indicate the mass ratios of the substances used. V. The sum of the coefficients on the reactant side equals the sum of the coefficients on the product side.
Answer: I. The number of molecules is conserved.
III. Atoms are neither created nor destroyed
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
For example: [tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]
Thus in the reactants, there are 4 atoms of hydrogen , 2 atoms of oxygen and 2 atoms of sodium.Thus there will be 4 atoms of hydrogen, 2 atoms of oxygen and 2 atoms of sodium in the product as well.
When a solution of NaI reacts with a solution of AgNO3, what is the net ionic equation?
Na+ (aq) + NO3- (aq) → NaNO3 (s)
Na (aq) + NO3 (aq) → NaNO3 (s)
No reaction
Ag+ (aq) + Cl- (aq) → AgCl (s)
Answer:
Ag⁺(aq) + I⁻(aq) → AgI(s)
Explanation:
Net ionic equation is a way to write a chemical equation in which you are listing only the species that are participating in the reaction.
In the reaction:
AgNO₃(aq) + NaI(aq) → AgI(s) + NaNO₃(aq).
The ionic equation is:
Ag⁺(aq) + NO₃⁻(aq) + Na⁺(aq) + I⁻(aq) → AgI(s) + Na⁺(aq) + NO₃⁻(aq).
Now, listing only the species that are participating in the reaction:
Ag⁺(aq) + I⁻(aq) → AgI(s)Complete the following ionic equation: [tex]Zn + 2Ag^{+} ---\ \textgreater \ ......... + ..........[/tex]
Answer: [tex]Zn+2Ag^+\rightarrow Zn^{2+}+2Ag[/tex]
Explanation:
Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously and the number of electrons lost is equal to the number of electrons gained.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
Anode : [tex]Zn\rightarrow Zn^{2+}+2e^-[/tex]
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
Cathode : [tex]2Ag^++2e^-\rightarrow 2Ag[/tex]
Thus the complete ionic equation will be :
[tex]Zn+2Ag^+\rightarrow Zn^{2+}+2Ag[/tex]
Help please!!, It is URGENT
Can two different liquids have the same density? Explain.
(if you don't know don't answer).
Answer:
No
Explanation:
There is a chart made just for density. It finds whatever liquid you want based on the density. 2 liquids cannot have the same density.
Formation of heat and/or light when two substances are combined indicate a _______ change.
Answer:
It's a chemical change
