SC 4 P 8 1

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

• protons and electrons

• electrons and neutrons

• protons and neutrons

Tags

NGSS.MS-PS1-1

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

• True

• False

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

Elian is testing his hypothesis that the more ripe an orange is, the more Vitamin C it contains. He takes four oranges of varying degrees of ripeness and squeezes samples of juice from each one. He then measures the concentration of Vitamin C in each sample of orange juice. He systematically adds a measured amount of a chemical called a titrant into the orange juice, waiting for its color to change. When its color changes, he knows that the amount of Vitamin C present in the juice is equal to the amount of the titrant he has added, which he can calculate. What does Elian think is the independent variable in this experiment?

• orange ripeness

• amount of titrant

• color of the solution

• amount of Vitamin C per orange

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

• true

• false

Atoms are not the smallest unit of all living and nonliving substances.

• True

• False

Tags

NGSS.MS-PS1-1

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.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Light travels in waves. Which of the following statements about light waves is NOT true.

• They travel in straight lines.

• They can come from natural or artificial sources.

• They can change directions when they are reflected or refracted.

• They can travel through any substance.

Tags

NGSS.MS-PS4-2

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