Sc 4 P 9 1

An atom's atomic weight measures the total of the mass of the protons, neutrons, and electrons.

• True

• False

Tags

NGSS.MS-PS1-5

Protons are small, positively-charged atomic particles

• True

• False

Kyle wanted to see which gum had the most sugar. He chose four different brands of gum. He weighed each piece. Then he chewed each piece for 10 minutes. After that, he let the gum dry and weighed it again. He recorded his data in the table below. What is the independent variable in Kyle's experiment?

• the weight of the final dried gum

• the time chewed

• the change in weight of the gum

• the brand of gum

The period table of the elements is a tool used by scientists.

• true

• false

The __________ and _________ make up the majority of an atoms atomic mass.

• protons and electrons

• electrons and neutrons

• protons and neutrons

Latisha notices that when she rubs her hands together, they feel warm. Which of the following is the best explanation for why this happens?

• Energy is reflected into her hands.

• Heat energy is produced by friction.

• Light energy of the sun heats her hands.

• Energy is absorbed from the air by her hands.

Damian was studying mechanical energy in science class. He noticed several possible examples of mechanical energy in his environment. Which of the following is an example of mechanical energy?

• A lamp that is not plugged in.

• An unused battery.

• A windmill with no wind.

• A garden hose with moving water.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

The smooth, shiny surface of the water shows a hot air balloon. What causes the image of the hot air balloon to appear on the surface of the water?

• The refraction of light.

• The reflection of light.

• The absorption of light.

• The splitting of light.

Tags

NGSS.MS-PS4-2

What energy change occurs when an electric stove is turned on?

• Mechanical energy is converted into electrical energy

• Electrical energy is converted into chemical energy

• Mechanical energy is converted into heat energy

• Electrical energy is converted into heat energy

Jason stretches a rubber band between his fingers as shown. When he plucks the rubber band, it makes a sound. Which of the following BEST explains why the rubber band makes a sound when Jason plucks it?

• It heats the air.

• It vibrates the air.

• It absorbs energy from the air.

• It releases molecules into the air.

Tags

NGSS.MS-PS4-1