Chemistry Final Review

Which of the following best describes a solid?

• Has a definite shape and volume due to closely packed molecules.

• Has a definite volume but takes the shape of its container.

• Lacks a definite shape or volume; molecules are widely spaced.

• Changes shape and volume randomly.

What is the process called when a gas turns into a liquid, releasing energy?

• Freezing

• Condensation

• Melting

• Boiling

Tags

NGSS.MS-PS1-4

Which statement correctly explains the difference between water and steam?

• Steam is water in solid form with tightly packed molecules.

• Steam is water in gas form with spread-out molecules and higher energy.

• Steam is water in liquid form with less energy.

• Steam is water in liquid form with more tightly packed molecules.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is a crystalline structure?

• A random arrangement of atoms in solids.

• A specific arrangement of atoms in solids that gives them a defined shape and structure.

• The arrangement of molecules in gases.

• The arrangement of molecules in liquids.

Tags

NGSS.MS-PS1-1

Which of the following is an example of a physical change?

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

A student observes dew forming on grass in the morning. Which phase change is occurring, and what is happening to the energy of the molecules?

• Condensation; energy is released as gas turns into liquid.

• Freezing; energy is absorbed as liquid turns into solid.

• Melting; energy is absorbed as solid turns into liquid.

• Boiling; energy is released as liquid turns into gas.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following best describes a physical change?

• A change that alters the chemical composition of a substance.

• A change that creates a new substance.

• A change that does not alter the chemical composition of a substance.

• A change that only occurs in gases.

Which of the following best describes a chemical change?

• Ice melting into water

• Rusting of iron

• Mixing sugar in tea

• Dissolving salt in water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a homogeneous mixture?

• Salad

• Iced tea with sugar

• Saltwater

• Sand and iron filings

According to modern atomic theory, what are atoms made of?

• Only protons

• Protons and neutrons in the nucleus, with electrons in a surrounding cloud

• Only electrons

• Only neutrons

Tags

NGSS.MS-PS1-1