8th Grade - Final Exam Practice - Science

Use the periodic table provided to answer the following question:

Which of the following choices identifies a group on the periodic table with one electron available for bonding?

• a

• b

• c

• d

Use the periodic table provided to answer the following question:

Which of the following choices identifies a group on the periodic table with zero electrons available for bonding?

• a

• b

• c

• d

Use the periodic table provided to answer the following question:

Based on what you know about the periodic table, element 19 (K - potassium) must be a...

• metal

• metalloid

• nonmetal

• noble gas

All of the following actions will increase the rate at which a cube of sugar dissolves in water except...

• crushing the cube into smaller pieces

• heating the water

• adding more cubes of sugar to the water

• stirring the water

Tags

NGSS.MS-PS1-4

Shown is a table of observations made about a certain element. Based on the information in the table, it can be determined that the element is a...

• nonmetal

• metal

• metalloid

• liquid

The diagram shows a partially filled 10 mL graduated cylinder. The cylinder and liquid together have a mass of 13 grams. If the empty graduated cylinder has a mass of 4 grams, what is the density of the liquid?

• 0.78 mL/g

• 0.90 mL/g

• 1.29 g/mL

• 1.85 g/mL

Tags

NGSS.MS-PS1-2

Elements in the same group of the periodic table tend to have similar reactivities because they have the same number of...

• electrons

• electrons in their highest occupied energy level

• protons

• protons and neutrons in their nuclei

When sodium and sulfur bond, how many sodium atoms bond with each sulfur atom?

• 1

• 2

• 4

• 6

The noble gasses form very few compounds because they...

• are gases

• have stable electron arrangements

• are radioactive

• do not have electronegativity values

The image represents a bond forming between an atom of lithium and an atom of fluorine.

What type of bond is formed between atoms of lithium and fluorine? (HINT: lithium is a metal and fluorine is a nonmetal)

• covalent

• polar covalent

• ionic

• metallic