1. When a mixture contains substances that are not evenly mixed, what is it called?

• a) Homogeneous mixture

• a) Heterogeneous mixture

• a) Substantial mixture

• a) Disharmonic mixture

1. What is a compound?

• a) Several elements that have chemically bonded together

• a) Any substance with more than two atoms

• a) Any chemical process involving oxygen

• a) One element consisting of chemically bonded atoms

1. Dissolving sugar in water leads to what kind of type of mixture?

• a) Heterogeneous mixture

• a) Syrup

• a) Isotonic water

• a) Homogeneous mixture

1. What is a feature of ALL substances?

• a) They all share the same boiling point

• a) They all have the same mass

• a) They all have the same density

• a) They all have their unique properties

1. What type of solution is saltwater?

• a) heterogeneous

• a) Compound

• a) element

• a) homogenous

1. An element consists of just one type of

• atom

• mixture

• compound

• electron

1. Each type of atom contains a different number of protons in its

• neutron

• electron

• nucleus

• atom

1. The number of protons in an atom determines an element’s

• composition

• a) atomic number.

• a) chemical formula.

• a) Atomic mass

1. The atoms of most elements exist

• a) as individual atoms.

• a) in pairs.

• a) in groups.

• a) In mixture

1. Which item is a substance?

• a) aluminum

• a) apple juice

• a) muddy water

• a) paper