Ch. 3 Chemistry Review

transcript

7th Grade Science

Question 1

A pure substance made of two or more elements

that are chemically combined.

Answer 1

Compound

Question 2

When iced tea mix is combined with water,

this is the solvent.

Answer 2

Question 3

Choose the correct example of a physical property.(density, flammability,

reactivity)

Answer 3

Density

Question 4

How is a mixture different from a compound?

Answer 4

Each substance in a mixture keeps its chemical properties,

while each substance in a compound form together to create a new substance with

new chemical properties.

Question 5

A metal dissolved in a metal is known as

_________________. Steel is an example.

Answer 5

CO2CO2

Question 6

A salad would be referred to as a : (solution,

mixture, or compound)

Answer 6

Mixture

Question 7

An object that has properties of both

solutions and suspensions is know as a

……….

Answer 7

Colloid

Question 8

List two elements.

Answer 8

118 possible answers…use your periodic table

to ensure you are correct.

Question 9

Give an example of a solute that can be

dissolved into water.

Answer 9

Iced tea mix, lemonade mix, salt, sugar, etc.

Question 10

NaCl is classified as a ________________.

Answer 10

Compound

Question 11

What is formed when particles of two or more

substances are distributed evenly among

each other?

Answer 11

Solution

Question 12

What are three ways to dissolve a solute more quickly in a solvent?

Answer 12

Mix it more, crush it, heat the solute.

Question 13

This compound is used by plants during

photosynthesis.

Answer 13

CO2CO2

Question 14

List one element that is classified as a nonmetal.

Answer 14

Use your periodic table to check your answer. (You

will need this for the test!)

CO2CO2

Question 15

A smoothie is a great example of this type of

mixture: _______________.

Answer 15

suspension

CO2CO2

Question 16

Sand, Soil, and Dirt are all examples of

________________.

Answer 16

A mixture of solids.

CO2CO2

Question 17

What is a pure substance?

Answer 17

A single element or compound that has definite chemical or physical properties.

CO2CO2

Question 18

Give an example of a pure substance.

Answer 18

Any compound or element would be a

correct answer.

CO2CO2

Question 19

What ways can be used to separate a mixture?

Answer 19

A magnetA centrifugeDistillation

A Filter

CO2CO2

Question 20: Is the item shown below:A. ElementB. Compound and MoleculeC. Element and MoleculeD. None of the above

Answer 20: Element

Explain Why.

Answer 21: Element and Molecule

Explain Why.

Answer 22:

Compound and Molecule

Explain “Why.”

Question 23: Element, Compound or Mixture ?

Answer: Element

Answer: Mixture of different elements

Answer: Compound

Answer: A mixture of a compound and an element

Question 30:

How do you think you did on this review?

Answers will vary

Ch. 3 Chemistry Review

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