7th Grade Science Unit 1 Test Review

What is the chemical symbol for the element Chlorine?

• C

• Co

• Cl

• Ci

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DOK Level 1: Recall

Which substances are compounds?​ (a)   ​ (b)   ​ (c)  

​

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NGSS.MS-PS1-1

• 1

• 2

• 3

• 4

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DOK Level 1: Recall

Categorize each scenario as physical or chemical change.

Groups:

(a) Physical Change

,

(b) Chemical Change

• Chewing food

• Burning wood

• Saliva breaking down food in the mouth.

• Cutting paper

• Stomach acid breaking down food in the stomach.

• Muscles in the esophagus pushing food down to the stomach

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NGSS.MS-PS1-2

What is the role of a solvent in an aqueous solution?

• It is the substance being dissolved.

• It is the substance that dissolves the solute.

• It is the solid part of the solution.

• It is the gaseous part of the solution.

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DOK Level 1: Recall

How does increasing the temperature affect the rate of dissolution of a solid solute in water?

• It decreases the rate.

• It has no effect.

• It increases the rate.

• It stops the dissolution.

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DOK Level 1: Recall

What is the difference between elements and compounds?

• Elements are made of one type of atom; compounds are made of two or more types of atoms.

• Elements are made of molecules; compounds are made of atoms.

• Elements are made of compounds; compounds are made of elements.

• Elements and compounds are both made of the same type of atoms.

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DOK Level 2: Skill/Concept

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NGSS.MS-PS1-1

Which of the following scenarios is an example of a chemical change?

• Dissolving sugar in water

• Freezing water into ice

• Burning a piece of paper

• Cutting a piece of paper

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DOK Level 2: Skill/Concept

How does dilution affects the concentration of a solution?

• It increases the concentration.

• It decreases the concentration.

• It has no effect on the concentration.

• It doubles the concentration.

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DOK Level 2: Skill/Concept