Unit 2: 7SC_Chemical Reactions Quiz

The substance that is formed after a chemical reaction is called the ________.

• Reactants

• Products

• Heat

• Chemicals

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

During a science experiment, Favour and Easton noticed that when they mixed two substances together, ____________ was one of the signs that a chemical reaction was taking place.

• A. Bubbles were produced.

• B. The substances were not combining.

• C. No new products were forming.

• D. The shape of the substances was changing.

Tags

NGSS.MS-PS1-2

Joshua and Miracle are in a chemistry lab. They are given a pure substance made of two or more elements that are chemically combined. What would they call this substance?

• A. Element

• B. Compound

• C. Mixture

• D. Solution

Tags

NGSS.MS-PS1-1

A physical change is ____________.

• Where the substance or substances are modified but a new substance is not formed.

• Where two substances react to become something with new properties.

• When you mix two substances together and it changes color.

• When a substance or substances are rearranged to produce a new substance.

Tags

NGSS.MS-PS1-4

Kevin, Zaiden, and Gustavo are in a science class. They are experimenting with different substances. In one of their experiments, they noticed that the substance they were working with was modified, but a new substance was not formed. What is this called?

• It's when two substances react to become something with new properties.

• It's when you mix two substances together and it changes color.

• It's when a substance or substances are rearranged to produce a new substance.

• A physical change

Tags

NGSS.MS-PS1-2

Mason, Jordyn, and Evelyn were observing different processes during their science experiment. They noticed that ice melting, dry ice sublimating, water evaporating, and steam condensing are examples of what?

• A chemical change

• A physical change

• Exothermic reaction

• Endothermic reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Abby, Alyssa, and Lance are studying the properties of gases. They came across a statement and are having a debate about it. Which of the following is not true about gases?

• They spread out to fill their containers, like the perfume Nora sprayed in the room.

• The particles move very quickly, like the smoke from Harper's incense stick.

• The particles move very slowly, like the steam from Abigail's hot coffee.

• They have an indefinite volume, like the air in the classroom.

Tags

NGSS.MS-PS1-4

When magnesium is ignited it produces a great amount of light. This is an example of an ___.

• Exothermic chemical reaction

• Endothermic chemical reaction

• Exothermic physical change

• Phase change

Tags

NGSS.MS-PS1-2

You are given a mystery object in science class. Your teacher asks you to determine if your object is denser than water. You place the object in the water, and it sinks. What statement would best describe this situation?

• Water is denser than the mystery substance.

• They both have the same mass.

• The mystery substance must be hollow.

• The mystery substance is denser than water.

Tags

NGSS.MS-PS1-2

During a science experiment, Joshua, Geovanna, and Jaxsen observed that all particles in the air around them, like dust and pollen, are constantly _______.

• Growing

• Contracting

• Reacting

• Moving

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5