Chapter 6 Quiz

The three particles that make up an atom are:

• protons, neutrons and isotopes.
• neutrons, isotopes and electrons.
• positives, negatives and electrons.
• protons, neutrons and electrons.

Isotopes are atoms of the same element with the same number of protons and:

• a different number of electrons.
• a different number of molecules.
• a different number of neutrons.
• the same number of neutrons.

If an atom contains 11 protons and 12 neutrons, its atomic mass is:

• 1.
• 11.
• 12.
• 23.

A covalent bond is formed as a result of:

• transferring electrons.
• sharing electrons.
• transferring protons.
• sharing protons.

What type of ion forms when an atom loses electrons?

• neutral
• positive
• negative
• possibly positive or negative

When salt is dissolved in water, water is the:

• reactant.
• solution.
• solute.
• solvent.

If the pH of stomach acid and oven cleaner (base) were measured,

• both would be below 7.
• both would be above 7.
• the pH of stomach acid would be above 7, but the pH of oven cleaner would be below 7.
• the pH of stomach acid would be below 7, but the pH of oven cleaner would be above 7.

Proteins are made up of:

• amino acids.
• DNA.
• sugar.
• lipids.

What is the term used to describe the energy needed to get a reaction started?

• adhesion energy
• activation energy
• cohesion energy
• chemical energy

Enzymes affect the reactions in living cells by changing the:

• products of the reaction.
• speed of the reaction.
• temperature of the reaction.
• pH of the reaction.