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3 years ago

Why is mass conserved in a chemical change?

1 answer:

3 0

The Law of Conservation of Mass tells us that in an isolated system (the chemical reaction in this case), mass is neither created or destroyed. Furthermore, the mass of the reactants must be equal to the mass of the products. Chemical equations must always be balanced in that exactly how many atoms you used of each element in the reaction will make up the result. For example, the formation of water:

2H₂ + O₂ <span>→ </span>2H₂O

On each side we have 2 hydrogen atoms and 2 oxygen atoms. Thus, the mass on each side is the same. The elements have simply rearranged to form new compounds.

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6. Using the rules of significant figures, calculate the following:

Burka [1]

Answer:

A. 3

B . 2

C. 2

D. 2

E. 4 significant figures

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3 years ago

An unfortunate squirrel is hit by a car. A small bit of gas originally 0.005 L in volume is trapped in the squirrel's body at a

kykrilka [37]

Answer: The volume of the gas in the squirrel now is 0.00532 L

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=0.005L\\T_1=308K\\V_2=?\\T_2=328K$

Putting values in above equation, we get:

$\frac{0.005}{308}=\frac{V_2}{328}\\\\V_2=0.0053L$

Thus the volume of the gas in the squirrel now is 0.00532 L

3 0

3 years ago

2. A chemical reaction occurs when substances interact and their atoms

enot [183]

Answer:Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

Explanation:

4 0

3 years ago

D: ____________________________________________

Vikki [24]

Answer:

I think the awnser would be c urf mom

Explanation:

4 0

3 years ago

Catalysts are substances that ____________ the rate of a chemical reaction

ss7ja [257]

Catalysts are substances that speed up the rate of a chemical reaction. It is important to know that reacting species must first possess a minimum amount of energy equal to the activation energy for the reaction to proceed. The catalyst works in a way that lowers the activation energy required for the reaction to proceed. In this way, the reaction occurs at a faster rate than without a catalyst. Catalysts do not react with the chemical species in the reaction, thus, they are not consumed. However, over time, catalysts tend to degrade and their function is also reduced. When this happens, new catalysts replace the poisoned ones. Catalysts are widely used today since they bring an increase in the production rate of commercial chemicals.

8 0

3 years ago