REVIEW CHEMISTRY FINAL PREP for Dec 2024

Front

What happens to a chemical reaction in a sealed flask when the temperature is increased?

Back

The reaction will shift to the left and the concentration of HCl will decrease.

Front

Which sample will react faster: a large chunk of metal or many smaller shards of the same metal?

Back

Sample 2 because it has more surface area.

Front

What does a 'barking' sound indicate when a glowing wood splint is placed over a flask after reacting hydrochloric acid with zinc?

Back

The reaction had produced hydrogen gas.

Front

What can be true about three ground state atoms of different elements that each have one valence electron?

Back

They could be group 1 elements.

Front

Which sample has more thermal energy: 100 mL of boiling water or 500 mL of boiling water?

Back

Water in sample 2 has more thermal energy than water in sample 1.

Front

What is the definition of thermal energy?

Back

Thermal energy is the total kinetic energy of particles in a substance.

Front

What is the principle of conservation of mass in a chemical reaction?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is a catalyst and how does it affect a chemical reaction?

Back

A catalyst is a substance that increases the rate of a chemical reaction without being consumed.

Front

What is the difference between an endothermic and exothermic reaction?

Back

Endothermic reactions absorb heat, while exothermic reactions release heat.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons determine how an atom can bond with other atoms.