Unit 1 Review

How are isotopes different from one another?

• They have different numbers of neutrons

• They have different numbers of valence electrons

• They have different chemical properties

• They have different numbers of protons

What is the reaction between an acid and a base called?

• corrosion

• an indicator

• neutralization

• condensation

Gold has an atomic number of 79 and an atomic mass of 197. How many protons, neutrons, and electrons are in the atom?

• 79 protons, 79 electrons, 118 neutrons

• 197 protons, 79 electrons, 118 neutrons

• 118 protons, 79 electrons, 79 neutrons

• 197 protons, 118 electrons, 79 neutrons

What is the group of elements called that includes argon, neon, and helium?

• the metalloids

• the alkaline earth metals

• the halogens

• the noble gases

What is the charge of the sodium ion after it bonds with chlorine?

• unchanged

• negative

• neutral

• positive

What substance reacts with metals to produce hydrogen gas, tastes sour, and turns blue litmus paper red?

• a base

• a metal

• a salt

• an acid

What is the difference between ionic and covalent bonds?

• Ionic bonds form when a metal combines with a nonmetal, but covalent bonds form between nonmetals.

• Ionic bonds form between nonmetals, and covalent bonds form between metals.

• Ionic bonds form when metals combine, but covalent bonds form between nonmetals.

• Ionic bonds form between metal and nonmetal, but covalent bonds form between metals.

Aluminum atoms have three valence electrons. How does aluminum's reactivity compare to other metals with one or two valence electrons?

• Aluminum has a higher reactivity compared to the other metals

• Aluminum and the other metals have similar reactivity levels

• Aluminum has a lower reactivity than the other metals

• Aluminum has the same reactivity as the other metals

Elliott grows a sunflower, and it seems to grow out of nothing, contrary to the Law of Conservation of Mass. What is the sunflower an example of?

• a reactant

• a closed system

• an open system

• a product

Which of the following is not a benefit of synthetic foods?

• They take less time to produce

• They are less expensive

• They make food last longer

• They have no known health risks