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lesantik [10]
3 years ago
7

All chemical reactions have a conservation of(1) mass, only(2) mass and charge, only(3) charge and energy, only(4) mass, charge,

and energy
Chemistry
2 answers:
Semenov [28]3 years ago
7 0
All chemical reactions have a conversation of mass and energy. 

Because:- There are only two laws for conversation in a chemical reaction. The conversation of mass, no mass can be created nor destroyed. Also, the law of conversation of mass states that no energy can be created nor destroyed in a chemical reaction. The charge can obviously change because they can bond and change charges. 
tankabanditka [31]3 years ago
3 0

<u>Answer:</u> The correct answer is option 4.

<u>Explanation: </u>

<u>Law of conservation of mass</u> states that mass can neither be created nor be destroyed, but it can only be transformed from one form to another. It always remain conserved. In a chemical reaction, mass on the reactant side will be equal to the mass on the product side.

For Example: Reaction of hydrogen and oxygen to form water.

2H_2+O_2\rightarrow 2H_2O

Mass on the reactant side: [tex][2(2\times 1)+(2\times 16)]=36g/mol

Mass on the product side: [2\times ((2\times 1)+16)]=36g/mol

<u>Law of conservation of energy</u> states that energy can neither be created not be destroyed, but it can only be transformed from one form to another. In a chemical reaction, energy given to the reactants is released in the forma of energy of the products.

For Example: Melting of ice. In this process, the energy given to the ice is released in the form of kinetic energy of the water molecules (product).

<u>Law of Conservation of charge</u> states that charge can neither be created not be destroyed, but it can only be transformed from one form to another. In a chemical reaction, total charge on the reactant side will always be equal to the total charge on the product side.

For Example: Reduction of chlorine gas. The chemical equation follows:

Cl_2+2e^-\rightarrow 2Cl^-

Total charge on the reactant side = -2

Total charge on the product side = -2

From the above information, the correct answer is Option 4.

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aliya0001 [1]
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3 0
3 years ago
A jeweler guarantees that a piece of jewelry is at least 95% gold, by mass. You consider buying a piece of gold jewelry that wei
ELEN [110]
The density of the sample is:
Density = mass / volume
Density = 9.85 / 0.675
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If the sample has 95% gold, and 5% silver, its density should be:
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8 0
3 years ago
Which formula is an empirical formula? (1) CH4 (2) C2 H6 (3) C3 H6 (4) C4 H10
rosijanka [135]
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3 0
3 years ago
Read the given expression. X = number of protons − number of core electrons Which of the following explains the identity of X an
shepuryov [24]

<u>Answer: </u>The correct statement is X is the effective nuclear charge, and it increases across a period.

<u>Explanation:</u>

We are given that:

X = number of protons − number of core electrons

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The formula used for the calculation of effective nuclear charge given by Slater is:

Z^*=Z-\sigma

where,

Z^* = effective nuclear charge

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The effective nuclear charge increases as we go from left to right in a period because nuclear charge increases with no effective increase in screening constant.

Hence, the correct answer is X is the effective nuclear charge, and it increases across a period.

5 0
3 years ago
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katrin [286]

Chlorine-35 and 37 both have the same number of protons. Chlorine-37 has two more neutrons.

hope this helps!

(:

3 0
3 years ago
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