Final review CR

Oh no!!! The person across from you spills a container of an unknown substance on the table!! They see Mr. Dake did not notice and quickly clean it up. Its extremely obvious to you that they don't plan on telling Mr. Dake Which safety Guideline should you follow?

• 9
• 1
• 2
• 3
• 4

Scale in science means?

• The object you weigh yourself on
• It's what fish have on there sides
• Something that is made of all the same atoms or groups of atoms
• The relative size of things

During a chemical reaction, all of the atoms that make up the 1._____________ rearrange to form the 2.___________.

• 1. chemicals 2. atoms
• 1. reactants 2. products
• 1. items 2. other items
• 1. products 2. reactants

Jessie is a student chemist who assists Dr. Yung in her lab. While she was working, Jessie added some chlorine gas to a container she thought was empty. After Jessie added the chlorine gas, however, a solid, yellow substance formed in the container. Jessie tested the substance and identified it as sulfur. When Dr. Yung asked Jessie to explain what had happened in the container, she claimed that a chemical reaction had changed the chlorine into sulfur. Jessie’s Claim: A chemical reaction changed the chlorine into sulfur. Do you think that Jessie’s claim is correct?

• Yes
• No

Jessie is a student chemist who assists Dr. Yung in her lab. While she was working, Jessie added some chlorine gas to a container she thought was empty. After Jessie added the chlorine gas, however, a solid, yellow substance formed in the container. Jessie tested the substance and identified it as sulfur. When Dr. Yung asked Jessie to explain what had happened in the container, she claimed that a chemical reaction had changed the chlorine into sulfur. Jessie’s Claim: A chemical reaction changed the chlorine into sulfur. Do you think that the container was actually empty before Jessie added the chlorine?

• Yes
• No

What was in the jar Jessie put the chlorine gas into?

• hydrogen sulfide (H2S)
• iron sulfide (FeS)
• sodium sulfide (Na2S)
• hydrogen (H2)
• sulfuric acid (H2SO4)

Which Claim was correct?

• Claim 1: During the chemical reaction, only the rust was produced.
• Claim 2: During the chemical reaction, the rust and another substance were produced.

Based on these atomic-scale models, what other substance could be in the water besides rust?

• Sodium nitrite
• Potassium chromate
• Both
• Neither

During a chemical reaction, atoms cannot be created or destroyed.

• True
• False

What is the science definition of Product?

• An ending substance that is made during a chemical reaction
• A starting substance that is part of a chemical reaction
• Something a company makes to make money
• An object, diagram, or computer program that helps us understand something by making it simpler or easier to see