Free Printable chemistry

Worksheets

chemistry

Total questions: 28

Worksheet time: 2hrs 2mins

Name

Class

Date

Pure oxygen (O) is an example of...

an element

a mixture

a compound

Combination of two or more substances that are not chemically combined.

mixture

solution

solvent

solute

The amount of matter in an object is a measure of the object's ________________.

volume

density

mass

solubility

Steam is an example of what state of matter?

Solid

Liquid

Gas

Thermo

What is 78.5 rounded to one significant figure?

78.5

What is the volume of the water?

Use the correct number of significant figures.

20.6

21.61

21.6

Sig Figs include all certain digits and an estimated digit. Therefore, sig figs show the precision of the measurement.

True

False

Placeholder zeros are not significant figures. They are only there to give value (keep

in right place) to the other digits.

True

False

How many significant figures: 1000 mL

10.

How many significant figures: 4.20 cm

11.

Write the following number in scientific notation.

360

$3.6\times10^2$

$0.36\times10^2$

$3.6\times10^3$

$3.6\times10^{-2}$

12.

Choose the smaller number.

$9.5\times10^4$

$9.21\times10^7$

13.

Convert 62 miles/hour to feet/second

5,456 feet/second

.003 feet/second

90.9 feet/second

909 feet/second

14.

The waiting time to ride a roller coaster is 20 minutes when 150 people are in line. How long is the waiting time when 240 people are in line?

32 people

32 minutes

12.5 minutes

12.5 people

15.

What is the charge of a neutron?

Negative

Positive

Neutral

16.

What is the charge of a proton?

Negative

Positive

Neutral

17.

As an Na atom forms an Na+ ion, the number of protons in its nucleus

Decreases

Remains the Same

Increases

18.

Which atom contains exactly 7 protons?

sulfur - 32 (S)

phosphorus-32 (P)

oxygen-15 (O)

nitrogen-15 (N)

19.

Calcium has three different isotopes. One has a mass of 35.00 amu; another has a mass of 41.00 amu; and another has a mass of 40.00 amu. Which isotope is the most abundant of the three?

40.00 amu

41.00 amu

35.00 amu

impossible to tell

20.

4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?

41.97 amu

42.19 amu

10.43 amu

40.04 amu

21.

What is the correct order of scientists in order of their work related to the atomic theory from earliest to most recent?

Neils Bohr, Ernest Rutherford, JJ Thomson, John Dalton, & Democritus

JJ Thomson, John Dalton, Neils Bohr, Ernest Rutherford, & Democritus

Democritus, John Dalton, JJ Thomson, Ernest Rutherford, and Neils Bohr

John Dalton, Neils Bohr, JJ Thomson, Democritus, & Ernest Rutherford

22.

Ernest Rutherford discovered that the atom was mostly _________________ and has a _______________ charged nucleus.

empty space, positively

empty space, negatively

full of protons, positively

full of neutrons, negatively

23.

N₂ + 3H₂ → 2NH₃

What is the mole ratio between Nitrogen and Ammonium in the above reaction?

1 moles NH₃ / 2 moles N₂

2 moles NH₃ / 1 moles N₂

2 moles N₂ / 3 moles NH₃

1 moles N₂ / 3 moles NH₃

24.

6CO₂+ 6H₂O --> C₆H₁₂O₆ + 6O₂

What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

2.5

25.

When nuclei decay, massive amounts of __________ is released.

energy

electrons

protons

neutrons

26.

After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged. What was the original mass of the sample?

16g

32g

0.0625g

27.

Complete the nuclear equation and determine the type of decay that is occurring in this reaction.

alpha

beta

gamma

none

28.

This is the correct equation for the decay of Ra.

true

false

Reset

chemistry

Total questions: 28

Worksheet time: 2hrs 2mins

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