Chemistry Semester 1 Practice Final (minus mole)

Front

What is the formula for calculating density?

Back

Density = \frac{mass}{volume}

Front

What is the density of a block measuring 2 cm x 2 cm x 5 cm with a mass of 54 grams?

Back

2.7 g/cm³

Front

Is rusting a chemical or physical change?

Back

Chemical change

Front

What happens to an atom when it gains electrons?

Back

It becomes negatively charged.

Front

What is an isotope?

Back

An isotope is an atom that has the same number of protons but a different number of neutrons.

Front

How do you balance the equation HgO -> Hg + O2?

Back

2HgO -> 2Hg + O2

Front

What is the charge of an ion that has lost electrons?

Back

Positive charge

Front

What is the charge of an ion that has gained electrons?

Back

Negative charge

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that retain their individual properties, while a compound is a substance formed when two or more elements chemically bond.

Front

What is the law of conservation of mass?

Back

The law states that mass is neither created nor destroyed in a chemical reaction.