Free Printable Chemistry pre-assessment

1.

$3+2\left(7-4\right)$

a)

9

b)

13

c)

15

d)

31

2.

0.000786 in scientific notation is

a)

$7.86\ \times10^{-3}$

b)

$7.86\times10^{-4}$

c)

$7.86\times10^4$

d)

$7.86\ \times10^3$

3.

$2^4$

a)

4

b)

8

c)

16

d)

32

4.

$\frac{9cm^3}{3cm^2}$

a)

$3cm^5$

b)

$3cm^1$

c)

$3cm^{-1}$

d)

$3cm^{-5}$

5.

If 2a = 3b, and a = 6, what does b equal?

a)

2

b)

4

c)

6

d)

12

6.

Density is defined as mass per unit volume or

d=\frac{m}{v}

Solve the density equation for variable v.

a)

$v=d+m$

b)

$v=\frac{d}{m}$

c)

$v=dm$

d)

$v=\frac{m}{d}$

7.

The value of a fraction is less than 1 when…

a)

numerator > denominator

b)

denominator > numerator

c)

abscissa > ordinate

d)

ordinate > abscissa

8.

How many small cubes are in the larger cube?

a)

15

b)

20

c)

30

d)

60

9.

If a variable X is directly proportional to variable Y, it means…

a)

as Y increases, X increases.

b)

as Y increases, X decreases

c)

there is no relationship between X and Y

d)

none of these answers are correct

10.

A spontaneous reaction occurs...

a)

very slowly

b)

by giving off large amounts of heat

c)

without any outside influence

d)

under high pressure

11.

Which of the following is a unit of volume?

a)

cm

b)

$\frac{lb}{in^2}$

c)

$cm^3$

d)

miles

12.

Which of the following is a hypothesis?

a)

The beaker weighs 4.65 g.

b)

When the two solutions were mixed, they turned into a solid.

c)

The liquid turned solid because there was a change in the molecular structure.

d)

The solid turned back into a liquid when it was heated.

13.

An aqueous solution is one…

a)

that is pale blue-green in color.

b)

does not leave a solid when evaporated.

c)

contains dissolved solids.

d)

is dissolved in water.

14.

A biology student conducted an experiment to find out how light and plant food affect the growth of a particular type of plant. She grew four plants and treated them differently. After three weeks, the plants looked as shown.

This experiment shows that…

a)

both light and plant food affect the growth of the plants.

b)

neither light nor food are factors affecting the growth of the plants.

c)

the greatest factor affecting the growth of this plant is plant food, not light.

d)

plants grow better with light, but plant food does not affect them.

15.

A biology student conducted an experiment to find out how light and plant food affect the growth of a particular type of plant. She grew four plants and treated them differently. After three weeks, the plants looked as shown

To show the effects of plant food on the growth of these plants, you should compare…

a)

plants A and D

b)

Plants B and D

c)

Plants A and B

d)

Plants C and D

16.

Some chemistry students designed an experiment to see how different metals react with strong and weak acids. They have added small amounts of metal filings (copper and iron) to beakers containing different acids (concentrated and dilute sulfuric and hydrochloric acids). They have carefully recorded the experimental conditions.

To observe the effects of how different metals react, the students should compare…

a)

A and B or E and F

b)

B and C or F and G

c)

A and D or E and H

d)

C and H or D and G

17.

Some chemistry students designed an experiment to see how different metals react with strong and weak acids. They have added small amounts of metal filings (copper and iron) to beakers containing different acids (concentrated and dilute sulfuric and hydrochloric acids). They have carefully recorded the experimental conditions.

Which of the following would be a correct procedure for the students to follow?

a)

Compare E and H to see if the reaction rate depends on the strength of the acid.

b)

Compare A and D to see if the reaction rate depends on which metal is added to the acid.

c)

Compare A and C to see if the reaction rate depends on the strength of the acid.

d)

Compare A and H to see if the reaction rate depends on which acid is used.

18.

When baking soda is added to vinegar, the solution produces a gas (carbon dioxide). A student is trying to see if there is a relationship between the amount of vinegar added and the amount of gas produced. He added one gram of baking soda to different amounts of vinegar in a test tube, and collected the gas in a balloon. The data is graphed.

What is a valid conclusion to draw from this data?

a)

The amount of gas continues to increase as the amount of vinegar increases

b)

Adding more than 10 ml of vinegar does not lead to additional gas production

c)

The amount of gas produced depends only on the amount of baking soda in the test tube

d)

There is no relationship between the amount of gas produced and the amount of vinegar added

19.

When baking soda is added to vinegar, the solution produces a gas (carbon dioxide). A student is trying to see if there is a relationship between the amount of vinegar added and the amount of gas produced. He added one gram of baking soda to different amounts of vinegar in a test tube, and collected the gas in a balloon. The data is graphed.

What would be a valid conclusion if the student had added vinegar in the range of 0 - 10 ml only?

a)

The amount of gas produced continues to increase as the amount of vinegar increases

b)

Adding more than 10 ml of vinegar does not lead to additional gas production

c)

The amount of gas produced depends only on the amount of baking soda in the test tube

d)

There is no relationship between the amount of gas produced and the amount of vinegar added

20.

If brass is 25% (by weight) copper, how many grams of copper are in 12 grams of brass?

a)

3 g

b)

37 g

c)

48 g

d)

300 g

Chemistry pre-assessment

Total questions: 20

Worksheet time: 40mins

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