Chemistry Unit Review

What is the smallest unit of an element that retains the properties of that element?

• electron

• molecule

• neutron

• atom

A student passes a magnet over 10 grams of a powder. Four grams of the powder stick to the

magnet, while 6 grams do not. Which of these identifies the substance?

• element

• compound

• mixture

• solution

Sodium chloride (NaCl) is formed in a chemical reaction between sodium (Na) and chlorine (Cl₂). What is sodium chloride?

• element

• mixture

• compound

• atom

Tags

NGSS.MS-PS1-1

Which of these are broken down during chemical, but not physical, changes?

• elements

• mixtures

• solutions

• compounds

Structural differences between different chemicals can be represented in models of the

particles. Which drawing BEST represents a compound?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

Which type of matter can be separated by physical means?

• atom

• element

• compound

• mixture

Which of the following is an example of a compound?

• copper

• water

• iron

• carbon

Tags

NGSS.MS-PS1-1

A student studies four chemicals in a laboratory investigation. Which chemical cannot be further broken down into other chemicals using ordinary

laboratory processes?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Which element has 7 valence electrons?

• hydrogen (H)

• fluorine (F)

• lead (Pb)

• gold (Au)

What do the atomic numbers represent?

• protons

• neutrons

• atoms

• nucleus