Chemistry Review

Develop a model to describe the atomic composition of a water molecule. Which of the following best represents this model?

• Two hydrogen atoms and one oxygen atom

• One hydrogen atom and two oxygen atoms

• Two oxygen atoms and one nitrogen atom

• One hydrogen atom and one oxygen atom

Tags

OK.SCI.7.PS1.1

Analyze the following data: Before a reaction, a substance is a shiny, malleable metal. After the reaction, it is a brittle, dull powder. What can you infer about the reaction?

• A physical change occurred

• A chemical reaction occurred

• The substance was dissolved in water

• The substance was heated but not changed

Tags

OK.SCI.7.PS1.2

Gather information about synthetic materials. Which of the following statements is true regarding synthetic materials?

• Synthetic materials are made entirely from artificial resources

• Synthetic materials have no impact on society

• Synthetic materials are derived from natural resources

• Synthetic materials are always biodegradable

Tags

OK.SCI.7.PS1.3

Develop a model to describe how the total number of atoms does not change in a chemical reaction. Which of the following best represents this concept?

• Atoms are destroyed during a chemical reaction

• Atoms are created during a chemical reaction

• The number of each type of atom remains the same before and after the reaction

• The number of atoms decreases after the reaction

Tags

OK.SCI.7.PS1.5

Construct a device that releases thermal energy through a chemical process. Which of the following is an example of such a device?

• A solar panel

• A hand warmer

• A refrigerator

• A wind turbine

Tags

OK.SCI.7.PS1.6

Strategically plan a model to describe the atomic composition of carbon dioxide. Which of the following best represents this model?

• One carbon atom and two oxygen atoms

• Two carbon atoms and one oxygen atom

• One carbon atom and one oxygen atom

• Two carbon atoms and two oxygen atoms

Tags

OK.SCI.7.PS1.1

Interpret the following pattern: A substance changes color and temperature when mixed with another substance. What does this pattern suggest?

• A physical change

• A chemical reaction

• No change occurred

• The substances are immiscible

Tags

OK.SCI.7.PS1.2

Plan a report on the impact of synthetic materials on society. Which of the following should be included in your report?

• Synthetic materials have no environmental impact

• Synthetic materials are only used in the fashion industry

• Synthetic materials can lead to pollution and waste

• Synthetic materials are always more expensive than natural materials

Tags

OK.SCI.7.PS1.3

Use evidence to describe how mass is conserved in a chemical reaction. Which of the following statements is correct?

• Mass is lost during a chemical reaction

• Mass is gained during a chemical reaction

• Mass remains constant before and after a chemical reaction

• Mass is irrelevant in chemical reactions

Tags

OK.SCI.7.PS1.5

Design a device that absorbs thermal energy through a chemical process. Which of the following is an example of such a device?

• A solar oven

• An ice pack

• A microwave

• A light bulb

Tags

OK.SCI.7.PS1.6