Unit 3 Review

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

A student has a sample of an element. Which describes a trait the sample must have in order to be considered an element?

• The sample is a liquid at room temperature.

• The sample is made of only one type of atom.

• The sample contains different types of particles

• The sample can be seen only with a microscope.

Which of the samples shown represents a pure substance?

• substances 1 and 2

• substances 2 and 3

• substances 3 and 4

• substances 1 and 4

Tags

NGSS.MS-PS1-1

The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?

• Mixture

• Liquid

• Compound

• Element

When salt is dissolved in water, the resulting solution is a...

• element

• compound

• homogeneous mixture

• heterogeneous mixture

When salt, vinegar and spices are mixed in oil, the resulting solution is a...

• element

• compound

• homogeneous mixture

• heterogeneous mixture

Based on this table, which of the following statements is correct?

• Household ammonia is more acidic than bleach

• Toothpaste is more basic than household ammonia

• Pure water is more acidic than black coffee

• Pure water is more basic than toothpaste

Which statement below correctly describes what each of the substances is?

• Substance X and Z are mixtures and substance Y is a compound

• Substance X and Y are both compounds and substance Z is a mixture

• Substance Y is a compound and substance X and Z are both mixtures

• Substance X is a compound, substance Y is an element and substance Z is a mixture

Tags

NGSS.MS-PS1-1

H₂O is...

• a compound

• an element

• a heterogenous mixture

• a homogeneous mixture

Tags

NGSS.MS-PS1-1

H₂ is...

• a compound

• an element

• a heterogenous mixture

• a homogeneous mixture

Tags

NGSS.MS-PS1-1