Free Printable AP Chemistry First Nine Weeks

Worksheets

AP Chemistry First Nine Weeks

Total questions: 30

Worksheet time: 47mins

Name

Class

Date

4) A combination of sand, salt, and water is an example of a __________.

A) homogeneous mixture

B) heterogeneous mixture

C) compound

D) pure substance

E) solid

5) A small amount of salt dissolved in water is an example of a __________.

A) homogeneous mixture

B) heterogeneous mixture

C) compound

D) pure substance

E) solid

Find the number of moles in 75 grams of $NaHCO_3$

89mol

0.90mol

0.89mol

84mol

Find the molar mass of $NaHCO_3$

84g

.8401g

84.01g

81.04g

How many atoms are found in 1 mol of Xenon atoms?

6.022x10²³

3.011x10²³

1.204x10²⁴

6.022x10²⁴

Which of the following dimensional analysis setups will correctly convert 27.76 g of Li to atoms of Li?

Which of the following dimensional analysis setups will correctly convert 4.00x10²³atoms of cobalt to moles of cobalt? How many moles of colbalt are there?

setup B : 0.664 mol Co

setup A: 2.41x10⁴⁷mol Co

setup A : 0.664 mol Co

setup B: 2.41x10⁴⁷mol Co

What are the units for molar mass?

grams

amu

grams/mole

liters

Measuring the volume of a block uses which equation

$Length\ \times Width\times Height$

$\left(radius\right)^2\times Length\times\pi$

10.

Which liquid is the least dense?

oil

water

syrup

plastic bottle

11.

Why do some substances float on water?

they are warmer than water

they are cooler than water

they are more dense than water

they are less dense than water

12.

If an object has a density of 3.6 g/mL and you put it into water, will it sink or float?

sink

float

13.

A block has a mass of 20.0 g and a volume of 40.0 cm³. What is its density?

2.0 g/cm³

1.2 g/cm³

0.5 g/cm³

4.0 g/cm³

14.

A mechanical pencil has the density of 3.000 g/cm³. The volume of the pencil is 15.8 cubic centimeters. What is the mass of the pencil?

47.4 g

50 g

0.190 g

5.27 g

15.

If a block of wood has a density of 0.6 g/cm3 and a mass of 120 g, what is its volume?

300 cm3

200 cm3

100 mL

150 cm3

16.

What is the molar mass of Mg₃N₂?

191.6 g/mol

76.64 g/mol

38.32 g/mol

100.95 g/mol

17.

How many moles of carbon atoms are there in 5g of carbon?

60 mol

17 mol

0.42 mol

7 mol

18.

How many atoms of iodine are in a mole of iodine?

63.55g

126.9

6.02 x 10²³

19.

What is a mole?

6.022 x 10²³ particles of any substance

A small burrowing animal

A dark spot on your skin

A spy

20.

Find the mass in grams of 0.75 moles of magnesium (Mg).

32 grams

18 grams

2.21 x 10 ^23 grams

21.

How many molecules are present in 25 g of NaBr?

102.96 molecules

0.24 molecules

1.45x10²³ molecules

2.34 x 10²⁰molecules

22.

What is the mass of 54.3x10⁴⁵molecules of BeO?

3.27x10⁷⁰ g

9.01 x10²²g

2.25 x10²⁴ g

1.31 x10⁶⁹g

23.

A pure substance that cannot be broken down into any other substance.

Elements

Compounds

Mixtures

24.

A ___________ is a combination of many different elements not chemically combined.

Element

Compound

Mixture

25.

Brass is a metal that is bright red and gold. It is formed by combining, not chemically, two elements, zinc and copper. Based on the information, how would brass be classified?

an element

compound

mixture

suspension

26.

How would you write the isotope name from this nuclide symbol?

Sodium-23

Sodium-11

Sodium-12

Sodium-22

27.

These three isotopes of carbon have different -

Atomic numbers

Mass numbers

Numbers of protons

Symbols

28.

How many protons does this isotope of titanium have?

29.

How many electrons are in a neutral atom of the isotope fluorine-20?

30.

What is the name of the isotope with 54 protons and 79 neutrons?

Xenon-79

Gold-79

Gold-133

Xenon-133

100 %

AP Chemistry First Nine Weeks

Total questions: 30

Worksheet time: 47mins

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