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Chemistry > Unit 1 > Flashcards

Unit 1 Flashcards

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1
Q

One side of a cube measures 2.0 m. The volume of this cube is _______ m^3.

A

8.0

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2
Q

How many significant figures are in the measurement 0.000221700?

A

Six

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3
Q

What is the answer to the following problem using the correct number of significant figures? 1.00 x 7.000 x 2.0=

A

14

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4
Q

What is the answer to the following problem using the correct number of significant figures? 1.50 + 3.010=

A

4.51

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5
Q

How many sig figs are in the following measurement? 1.30 x 10^3

A

3

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6
Q

The correct answer (reported to the proper number of significant figures) to the following is… 4.0 x 2.00 =

A

8.0

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7
Q

What is the purpose of using significant figures in the science laboratory?

A

To determine the precision of measurement

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8
Q

You have a 5.2 L sample of oil. How many milliliters is this?

A

5200 mL

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9
Q

A patient must take 220 mg of pain medication every six hours. How many grams is that?

A

.22 g

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10
Q

You have signed up for a 8-kilometer race; how many centimeters will you be running?

A

8 x 10^5

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11
Q

3 kilogram = ______ milligrams

A

3 x 10^6

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12
Q

If you do not understand a direction or part of a lab procedure, you should ….

A

ask the instructor before proceeding

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13
Q

After completing an experiment, all chemical wastes should be …

A

disposed of according to your instructor’s directions.

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14
Q

A substance that can be separated by filtration might be a(n)

A

Heterogeneous Mixture

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15
Q

If matter is uniform throughout and cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a(n) …

A

Compound

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16
Q

The teacher performs an experiment before the class. The student observes the following: gas given off, odor, gives off heat, change of color. What type of change has likely taken place?

A

A chemical change

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17
Q

Which phase change is occurring when solid carbon dioxide turns into a gas?

A

sublimation

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18
Q

If molecules go from flowing around one another to a state where they are much closer and vibrating about a fixed point, which phase change has occurred?

A

Freezing

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19
Q

Solids have a _____ shape and are ______.

A

definite, not easily compressed

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20
Q

You are given a large piece of wood. You cut the wood in half. What happens to the density?

A

The density does not change.

21
Q

The density of aluminum is 3.00 g/mL. The volume of a piece of aluminum is 2.00 mL. Find its mass.

A

6.00 g

22
Q

The density of a pure diamond is 4.0 g/mL. The mass of a diamond is 1.0 g. What is the volume?

A

.25 mL

23
Q

The mass of a 10.0 mL sample of kerosene is 5.00g. The density of the kerosene is:

A

.500 g/mL

24
Q

What is the density of distilled water?

A

1.0 g/mL

25
Q

Look at the diagram attached. Which board shows precision but not accuracy?

A

Bottom left

26
Q

True or False: Salt water, & salad can ONLY be separated by a chemical reaction.

A

False

27
Q

True or False: Sodium chloride can ONLY be separated by a chemical reaction.

A

True.

28
Q

True or False: Sodium, Salad and Sodium Chloride are classified as a homogeneous mixture.

A

False

29
Q

True or False: Salt water is classified as a homogeneous mixture.

A

True

30
Q

True or False: Sodium, salad, & salt water are classified as compounds.

A

False

31
Q

True or False: Sodium Chloride is classified as a compound.

A

True

32
Q

Is reactivity a chemical or physical property?

A

Chemical

33
Q

Three physical properties of water are:

A

It has a boiling point of 100 degree Celsius. It is a colorless liquid. Sugar dissolves in it.

34
Q

Is corrosion of metal a physical or chemical change?

A

Chemical

35
Q

Is density an intensive or extensive physical property?

A

Intensive

36
Q

Is mass an intensive or extensive physical property?

A

Extensive

37
Q

When a metal rusts, is it a chemical or physical change?

A

Chemical

38
Q

What kind of volume and shape does oil have at room temperature?

A

Definite volume, Indefinite shape

39
Q

What kind of volume and shape does nitrogen take at room temperature?

A

Indefinite volume and indefinite shape

40
Q

True or False: Water at 175 degrees Celsius is more easily compressed than water at 25 degrees Celsius or -10 degrees Celsius.

A

True

41
Q

True or False: Two samples of a pure substance may have different densities

A

False

42
Q

True or false: density is a chemical property

A

False

43
Q

True or false: the density of a sample depends on its location on earth

A

false

44
Q

True or false: density is a physical property

A

true

45
Q

Look at the diagram attached. At which point will this compound be a liquid?

A

G

46
Q

Look at the diagram attached. After the compound undergoes a decrease in pressure from point G to F; which phase change does it experience?

A

Evaporation

47
Q

At point A, the compound is a ________. At point G, the compound is a ________.

A

Solid; Liquid.

(When the compound is below the line it is a gas.)

48
Q
A

Chemistry (11 decks)

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