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never [62]
3 years ago
10

Which statement best describes a physical change? Changes can occur to certain chemical properties of the substance, but the ove

rall shape of the substance will remain the same. Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same. Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same. Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.2
Ill give you brainliest
Chemistry
1 answer:
icang [17]3 years ago
3 0
<h3>Changes can occur to the physical properties of a substance, but the chemical composition of the substance remains the same.</h3>

Explanation:

A physical change can not change the chemical makeup of a substance. If it did, it would be considered a chemical change. It can, however, be physically changed.

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4 years ago
Calculate the percentage by mass of the indicated element in the following compounds.
jarptica [38.1K]

Answer: The mass percent of carbon in acetylene is 92.31 %.

Explanation:

In C_2H_2, there are 2 carbon atoms and 2 hydrogen atoms.

To calculate the mass percent of element in a given compound, we use the formula:

\text{Mass percent of carbon}=\frac{\text{Mass of carbon}}{\text{Molar mass of acetylene}}\times 100

Mass of carbon = 2\times 12g/mol=24g

Mass of acetylene = 2\times 12g/mol+2\times 1g/mol=26g

Putting values in above equation, we get:-

\text{Mass percent of carbon}=\frac{24}{26}\times 100=92.31\%

Hence, the mass percent of carbon in acetylene is 92.31 %.

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4 years ago
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