Unit 6 Chemistry Test Review

Which is the best example of a pure substance?

• peanuts

• milk

• gold

• air

Which pair of elements has the most similar properties? (Hint: Look @ Periodic Table)

• Li and B

• I and Ca

• K and He

• N and P

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

• During a chemical reaction, the total amount of matter stays the same.

• During a chemical reaction, matter is destroyed.

• During a chemical reaction, one or more new substances are formed.

• During a chemical reaction, the total number of atoms increases.

How can mixtures best be described?

• made of one element

• made of different elements that are all chemically bonded together

• made of different elements that are not all chemically bonded together

In which state of matter will the atoms of an element be tightly packed together?

• solid

• liquid

• gas

Mg(OH)₂ is a compound. How many different elements are found in this compound?

• 1

• 2

• 3

If an element has no electrons to share and is stable, what family is it found in? (Hint: Periodic Table)

• alkali metals

• noble gases

• halogens

What is the significance of metalloids in the periodic table?

• They separate liquids from solids.

• They separate metals from nonmetals.

• They combine elements and compounds.

What chemical reaction results in the formation of a solid?

• acid base reaction

• endothermic

• precipitate

When baking soda and vinegar react, the product includes bubbles. What has most likely occurred?

• gas formation

• exothermic reaction

• precipitate formation