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Chemistry (10th) > Unit 1 Test > Flashcards

Unit 1 Test Flashcards

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1
Q

How many seconds are in 1.50 weeks?

A

907 s

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2
Q

how many sig. figs. are in the number 0.02?

A

1

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3
Q

Matter (define)

A

Anything that has mass + volume (everything)

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4
Q

What are the steps of the scientific method?

A

Observe - Define the problem (use 5 senses)

Hypothesis - Reasonable explanations for what was observed (educated guess)

Experiments - Test each hypothesis in order to prove/disapprove them

Analysis - Compares the results from the experiments to the original hypothesis

Conclusion (Theory) - A hypothesis supported by experimental evidence

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5
Q

How many g are equal to 345.7 mg?

A

0.3457

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6
Q

How many Micrograms (μg), Microliters (μL), and Micrometers (μm) are in grams (g), liters (L), and meters (m)?

A

10^-6μg = 1g
10^-6μL = 1L
10^-6μm = 1m

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7
Q

Write out 3.5 x 10^-5 in long form.

A

0.000035

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8
Q

Mass (define)

A

The amount of matter in an object

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9
Q

Write out 7,123 in scientific notation

A

7.123 x 10^3

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10
Q

Scientific Method (define)

A

organized approach to solve a problem

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11
Q

how many sig. figs. are in the number 0.020?

A

2

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12
Q

How many feet are equal to 54.7 inches?

A

4.56 ft

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13
Q

How many Kg are equal to 45,000 mg?

A

0.045 kg

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14
Q

How many Milligrams (mg), Milliliters (mL), and Millimeters (mm) are in grams (g), liters (L), and meters (m)?

A

1000mg = 1g
1000mL = 1L
1000mm = 1m

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15
Q

Answer the equation with the correct amt of sig. figs.
16.590/1.8 = ?

A

9.2

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16
Q

how many sig. figs. are in the number 2.0x10^-3?

A

2

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17
Q

How many mins are in an hour?

A

60 mins.

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18
Q

What are the properties of a gas?

A
  • Indefinite shape
  • Indefinite volume
  • Compressible
  • Very low density
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19
Q

How much feet are in a mile?

A

5280 feet

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20
Q

Energy (define)

A

Anything that can do work or produce heat

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21
Q

Mount Everest is approximately 8,000 meters high. How many miles high is Mount Everest?

A

5 miles

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22
Q

What is the symbol and meaning for the prefix micro?

A

Symbol: μ
Meaning: millionth (10 ^-6)

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23
Q

Write out 0.000000081 in scientific notation

A

8.1 x 10^-8

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24
Q

Give examples of a compound.

A

CO2 (carbon dioxide), NO2 (nitrogen dioxide)
(formed when elements chemically combine)

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25
Q

Answer the equation with the correct amt of sig. figs.
3.085 + 2.77448 = ?

A

1.112

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26
Q

Write out 8 x 10^8 in long form.

A

800,000,000

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27
Q

Answer the equation with the correct amt of sig. figs.
3.42 + 8.132 = ?

A

11.55

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28
Q

How many hours are in a day?

A

24 hours

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29
Q

What is the difference between an element and a compound?

A

Elements = made up of one atom but compounds = made up of 2 or more diff. elements (multiple atoms)

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30
Q

how many sig. figs. are in the number 2,002?

A

4

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31
Q

Answer the equation with the correct amt of sig. figs.
1.2 x 1.3 = ?

A

1.6

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32
Q

Answer the equation with the correct amt of sig. figs.
32.88/4.38 = ?

A

7.51

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33
Q

Answer (6 x 10^-8) x (4x10^-4) in proper scientific notation.

A

2.4 x 10^-11

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34
Q

A homerun in a baseball game was measured at 450 ft. How many meters is this equal to?

A

14 meters

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35
Q

Weight (define)

A

Force of gravity acting on an object’s mass

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36
Q

What is the rule for Multiplication and Division when solving an equation with sig. figs.?

A

the answer is rounded to the same # of sig. figs. as the # used in the calculation with the least sig. figs.

Ex #1: 17.85/2.13 = 8.38028 = 8.38
(You divide the 2 #’s and get that long number but since 2.13 is the # with the least sig. figs. you round your answer to get the same amt of sig. figs., which is 3, this will lead you to get the answer 8.38)
Ex #2: 0.0561 x 0.030 = 0.001683 = 0.0017 (rounded)

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37
Q

How many ounces are in a pound?

A

16 ounces

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38
Q

Write out 453,000 in scientific notation

A

4.53 x 10^5

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39
Q

What is the symbol and meaning for the prefix Kilo?

A

Symbol: K
Meaning: thousand

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40
Q

Answer the equation with the correct amt of sig. figs.
2.16 x 1.8 = ?

A

3.9

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41
Q

Chemistry (define)

A

The study of matter + the changes it undergoes

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42
Q

how many sig. figs. are in the number 20,000?

A

1

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43
Q

Answer the equation with the correct amt of sig. figs.
4.55 + 3.45 = ?

A

8.00

44
Q

What is the symbol and meaning for the prefix Milli?

A

Symbol: m
Meaning: thousandth

45
Q

Theory (define)

A

A hypothesis supported by experimental evidence

46
Q

how many sig. figs. are in the number 20,020?

A

4

47
Q

A chemistry student has a weight of 155 lbs. What is the student’s weight in grams? (1oz = 28.34 g)

A

70,300 g

48
Q

Measurement (define)

A

A type of observation

49
Q

What is Dimensional Analysis?

A

A method used to convert units

50
Q

What is the rule for Addition and Subtraction when solving an equation with sig. figs.?

A

the answer is rounded to the same # of decimal places as the # used in the calculation with the least decimal places.

Ex #1: 7.12 - 1.345 = 5.775 = 5.78
(7.12 has the least number of decimal places in the equation so we would round our answer 5.775 to have the same amt of decimal places. This would make the answer 5.78, which is also rounded to the nearest hundredth, DONT FORGET TO ROUND)
Ex #2: 5.7 + 2.11 = 7.81 = 7.8

51
Q

What is the symbol and meaning for the prefix Centi?

A

Symbol: c
Meaning: hundredth (0.01)

52
Q

Answer the equation with the correct amt of sig. figs.
4.3324 x 1.2 = ?

A

5.2

53
Q

How many Decigrams (dg), Deciliters (dL), and Decimeters (dm) are in grams (g), liters (L), and meters (m)?

A

10dg = 1g
10dL = 1L
10dm = 1m

54
Q

What is the symbol and meaning for the prefix Deci?

A

Symbol: d
Meaning: tenth (0.1)

55
Q

Qualitative Measurements (define) + examples

A

Descripted
Ex: hot, cold, heavy, light, big, blue, furry

56
Q

how many sig. figs. are in the number 1.09x10^4?

A

3

57
Q

How many grams (g), liters (L), and meters (m) are in Megagrams (Mg), Megaliters (ML), and Megameters (Mm)?

A

1Mg = 1,000,000g
1ML = 1,000,000L
1Mm = 1,000,000m

58
Q

Law (define)

A

Used to describe a natural phenomenon which has been tested over a long period of time under diff. conditions

59
Q

Is breaking chalk a chemical or physical chnange?

A

Physical change

60
Q

Write out 0.000157 in scientific notation

A

1.57 x 10^-4

61
Q

What are the properties of a liquid?

A
  • Indefinite shape
  • Definite volume
  • Not compressible
  • Less dense than solids
62
Q

What is the symbol and meaning for the prefix Mega?

A

Symbol: M
Meaning: Milllion

63
Q

Quantitative measurements (define) + examples

A

Observation made w/ a measuring instrument + includes both a # and a unit
Ex: ruler, balance, thermometer

64
Q

Give an example to show a measurement that is percise but not accurate.

A

30.00 mL
29.97 mL
30.00 mL

65
Q

Give examples of an element?

A

Hydrogen, Helium, Carbon etc. (anything on the Periodic Table)

66
Q

How many centimeters are in an inch?

A

2.45cm

67
Q

The Empire State Building is approximately 381 meters high. How many miles high is the Empire State Building?

A

0.237 miles

68
Q

Solve: 30,000 x 0.0004 in scientific form

A

1.2 x 10^1

69
Q

Change 0.00765 into mL

A

765 mL

70
Q

What are the base units?

A

mass: in grams (g)
volume: in liters (L)
length: in meters (m)

71
Q

how many sig. figs. are in the number 0.055870?

A

5

72
Q

Write out 2 x 10^3 in long form.

A

2000

73
Q

Solve: (3 x 10^-8) x (7 x 10^6)

A

2.1 x 10^-1

74
Q

Is molding clay a chemical or physical change?

A

Physical Change

75
Q

Law of Conservation of Matter/Mass (define)

A

In any chemical or physical change, matter cannot be created or destroyed (mass of reactants = mass of products)

76
Q

Write out 0.0029 in scientific notation.

A

2.9 x 10^-3

77
Q

Homogeneous mixture (define) + examples

A

Has a uniform compostion (parts of the mixture + cannot be picked out)
Ex: milk, sugar

78
Q

Is buring toast physical or chemical change?

A

Chemical change

79
Q

Heterogeneous mixture (define) + examples

A

Doesn’t have a uniform composition (Parts of the mixture can be physically seen + picked out)
Ex: cereal, salad, pizza

80
Q

How many grams (g), liters (L), and meters (m) are in Kilograms (kg), Kiloliters (kL), and Kilometers (km)?

A

1kg = 1,000g
1kL = 1,000L
1km = 1,000m

81
Q

A chemistry student’s height is measured at 68.5 inches. How tall is the student in cm?

A

17.4 cm

82
Q

Solve: 37,000 x 7,000 in scientific notation

A

2.59 x 10^8

83
Q

How many mm are equal to 4.75 x 10^-2 m?

A

47.5 mm

84
Q

How many ML are equal to 4.567 x 10^4 mL?

A

4.567 x 10^-5 mL

85
Q

Chemical changes (define) + examples

A

One or more substances react to form new substances w/ diff. chemical + physical properties (The beginning substances w/ diff. than the ending substances)
Ex: rusting, burning, decaying

86
Q

Write out 41,000 in scientific notation.

A

4.1 x 10^4

87
Q

Give an example to show a measurement that is neither accurate and percise.

A

31.57 mL
25.06 mL
29.72 mL

88
Q

What are the 2 major areas that matter is classified into?

A

1) Pure substances
2) Mixtures

89
Q

Pure Substances (define) + examples

A

Have uniform + definite composition
Ex: Elements + Compounds

90
Q

How many seconds are there in 2.5 days?

A

21 seconds

91
Q

Is rusting iron a physical or chemical change?

A

Chemical change

92
Q

List the rules for Significant Figures

A

1) All non-zero digits are significant
2) Leading zeros are never significant (zeros to the left)
3) Captive zeros are always significant (zeros in the middle)
4) Trailing zeros are sometimes significant (zeros at the end)
- they are sig. if the # contains a decimal point
- they aren’t sig. if # does NOT contain a decimal point

93
Q

What is the difference between compounds and mixtures?

A

In compounds = elements are bonded to each other but in Mixtures = the substances are blended (no definite composition - cannot assign a fixed ration)

94
Q

Write out 60,007,000 in scientific notation.

A

6.0007 x 10^7

95
Q

What are the properties of a solid?

A
  • Definite shape
  • Definite volume
  • Not compressible
  • High density
96
Q

Chemistry (define)

A

The study of matter + the changes it undergoes

97
Q

Physical changes (define) + examples

A

Changes in appearance w/o changing composition
Ex: cutting, breaking, freezing, boiling, melting

98
Q

Explain the difference between accuracy and precision.

A

Accuracy = How close a measurement is to the true or accepted value and Precision = How close multiple measurements are to each other

99
Q

How many Centigrams (cg), Centiliters (cL), and Centimeters (cm) are in grams (g), liters (L), and meters (m)?

A

100cg= 1g
100cL = 1L
100cm= 1m

100
Q

How many centimeters are in a meter?

A

100 centimeters

101
Q

How many inches are in a foot?

A

12 inches

102
Q

Give an example to show a measurement that is accurate and percise.

A

27.00 mL
27.00 mL
27.00 mL

103
Q

Physical Properties (define) + examples

A

Properties that can be measured or observed w/o chnaging the identity (or composition) of a substance
Ex: color, odor, texture, taste

104
Q

Chemical Properties (define) + examples

A

Properties that indicate how a substance reacts w/ other substances.
Ex: flammable, combustible, burnable

105
Q
A

Chemistry (10th) (6 decks)

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