Chemistry-H Final Exam Review

Front

What makes up most of the mass in an atom?

Back

Protons and neutrons.

Front

What coefficient should be assigned to Fe in the balanced equation: ___Fe(s) + ___ O2(g) → ___ Fe2O3(s)?

Back

4.

Front

Which two particles make up most of the mass of a hydrogen-2 atom?

Back

Proton and neutron.

Front

What describes a chemical change?

Back

Glucose (C6H12O6) and oxygen produce CO2 and H2O.

Front

What is the total number of moles represented by 20 grams of CaCO3?

Back

0.2 moles.

Front

Define an atom.

Back

The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What is a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is a mole in chemistry?

Back

A unit that measures the amount of substance, defined as containing exactly 6.022 x 10^23 particles.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.