8th Grade Physical Science Unit 1 Part B Review

Which region above is labeled as metals?

• Region A

• Region B

• Region ARegion C

• Region D

Which of the following is NOT true of a compound?

• It is made of two or more elements.

• It contains elements that are chemically combined.

• It contains elements combined in a specific ratio.

• It is made of substances that keep their individual properties.

From an element's location on the periodic table you can predict ________.

• its chemical symbol

• its properties

• when it was discovered

• its chemical name

An atom of gold with 6 protons, 6 electrons, and 7 neutrons would have a mass number of ______.

• 6

• 12

• 13

• 19

Tags

NGSS.MS-PS1-1

What is the key difference that makes an atom of one element so different from all others?

• The number of electrons

• The number of neutrons

• The number of protons

• The number of mass

Tags

NGSS.MS-PS1-1

Atoms with the same number of protons but a different number of electrons are ______.

• isotopes

• ions

• different elements

• different compounds

Which statement below is TRUE?

• In heterogeneous mixtures, all the parts look the same throughout.

• An example of a heterogeneous mixture is tea.

• In homogeneous mixtures, all the parts look the same throughout.

• All the parts in both heterogeneous and homogeneous mixtures look the same throughout.

Why are noble gases (Group 18) unreactive?

• Because they have 2 valence electrons.

• Because they have full outermost energy levels.

• Because they have empty outermost energy levels.

• They have 8 protons.

Identify the charges for the following parts of an atom:

Proton

• No Charge

• Negative

• Positive

Identify the charges for the following parts of an atom:

Neutron

• No Charge

• Negative

• Positive