123s of Chemistry Review

Front

What is photosynthesis an example of?

Back

Chemical change.

Front

What is coloring an example of?

Back

Physical change.

Front

What is an expression that tells the number and type of atoms in a molecule called?

Back

Chemical formula.

Front

In a chemical symbol, how are the letters capitalized?

Back

Only the first letter of the symbol is capitalized.

Front

Was mass conserved during the reaction Cl2 + 2NaBr -> 2NaCl + Br2?

Back

Yes.

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What does a chemical formula represent?

Back

The number and type of atoms in a molecule.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate the number of molecules.