8th grade Unit 2 Comp. Science Test

When combined in the correct ratio, hydrogen and oxygen atoms can form water as shown. In this example, water is an example of which of the following?

• A. Molecules of an element

• B. Molecules of a compound

• C. Atoms of a compound

• D. A mixture

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Copper (Cu) reacts with oxygen (O) to form copper oxide (CuO). The properties of copper oxide (CuO) are most likely:

• A. Different from copper or oxygen

• B. Similar to both copper and oxygen

• C. Similar to only copper

• D. Similar to only oxygen

Tags

NGSS.MS-PS1-2

Different arrangements of atoms are shown in the figure. Which figure represents a mixture?

• A. Figure 1

• B. Figure 2

• C. Figure 3

• D. Figure 4

Tags

NGSS.MS-PS1-1

The diagram below represents reaction of reactant A and reactant B combining to form product C. Reactant A illustrates an example of which of the following?

• A. Molecules of an element

• B. Atoms of an element

• C. Molecules of a compound

• D. A mixture

Tags

NGSS.MS-PS1-1

Which of the following best describes an atom?

• A. Protons, neutrons, and electrons all grouped together in the center.

• B. A core of negatively and positively charged particles surrounded by neutral particles.

• C. A core of positive and neutral particles surrounded by negative particles.

• D. A core of electrons and neutrons surrounded by protons.

Tags

NGSS.MS-PS1-1

Atoms are comprised of subatomic particles. Which of the following is a subatomic particle NOT found in the nucleus of an atom?

• A. The core

• B. Protons

• C. Electrons

• D. Neutrons

Tags

NGSS.MS-PS1-1

Use the picture of an atom to answer the question. Which statement best describes the part of the atom that is shown by the arrow?

• A. It is an electron, and it has a negative charge.

• B. It is an electron, and it has a positive charge.

• C. It is a proton, and it has a negative charge.

• D. It is a proton, and it has a positive charge.

Tags

NGSS.MS-PS1-1

Which of the pictures demonstrates a state of matter with a fixed shape and a fixed volume?

• A. J

• B. K

• C. L

• D. M

Which statement correctly describes both gases and liquids?

• A. Their shapes stay the same in any container.

• B. Their shapes change when they are in different containers.

• C. Their volumes stay the same in any container.

• D. Their volumes change when they are in different containers.

What best explains the reason solids have a definite shape and volume?

• A. the molecules in solids move past each other easily.

• B. the molecules in solids stay in a definite location and vibrate.

• C. the molecules in solids move freely in all directions.

• D. the molecules in solids do not move at all.