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Chem 4 > Chapter Two > Flashcards

Chapter Two Flashcards

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1
Q

In every measurement, a _____ is followed by a _____

A

number is followed by a unit

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2
Q

What happens if you don’t put a unit behind your measurements during lab?

A

You lose a point

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3
Q

The metric system (SI international system) is a decimal system based on ___, used most in the world, and used everywhere by scientist

A

10

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4
Q

The width of human hair is 0.000 008m is written as _______ in SN

A

8 x 10(-6)m

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5
Q

4,500,000 in SN is _______

A

4.5 x 10(6)s.

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6
Q

Going from a small number to a large number means your scientific notation exp. will be positive or negative?

A

Negative

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7
Q

Going from a large number to a small number means your scientific notation exp. will be positive or negative?

A

Positive

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8
Q

For scientific notation, do you move the decimal point left or right when going from a large number to a small number??

A

Left

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9
Q

For scientific notation, do you move the decimal point left or right when going from a small number to a large number?

A

Right

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10
Q

52,000.0 in SN?

A

5.2 x 10(4)

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11
Q

0.00378 in SN?

A

3.78 x 10(-3)

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12
Q

move the decimal so it’s greater than zero and less than _____

A

10

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13
Q

2.0 x 10(-2) in standard form?

A

0.020

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14
Q

To turn a scientific notation into standard form and the exp is negative, do you move the decimal left or right?

A

left

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15
Q

To turn a SN into standard form and the exp is positive, do you move the decimal left or right?

A

Right

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16
Q

4.5 x 10(3) is:

A

4,500.0

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17
Q

In measurement, your last digit is obtained by______

A

estimating

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18
Q

In measurement, if the line is a bit past 2.7 and just before 2.8, your answer should be:

A

2.75

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19
Q

In measurement, the length is 2.76cm. Identify each number.

A

2 and 7 are certain (known)
final digit, 6, is estimated (uncertain)
All three digits are still significant, INCLUDING the estimated digit.

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20
Q

In measurement, are all reported numbers significant digits, including the estimated digit?

A

Yes.

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21
Q

If a line is just past 9.0, it is not 9.0. It is either ____ or ____

A

9.03 or 9.04 because it has not passed the 9.1 line either

22
Q

If a line ends right at a line such as 4.5, the final estimation is _____ not _____

A

4.50, not 4.5

23
Q

1L = _____ mL

A

1,000mL

24
Q

1L = ___ qt

A

1.06qt

25
Q

946mL = ___ qt

A

one quart

26
Q

1m = ____cm

A

100

27
Q

1m = _____ in

A

39.4 inches

28
Q

1m = _____yd

A

1.09yd

29
Q

2.54cm = ___in

A

one inch

30
Q

1kg = ______g

A

1,000g

31
Q

1kg = ____lb

A

2.20lb

32
Q

454g = ____lb

A

1 lb

33
Q

Water freezes at ___ celsius and boils at ____ celsius

A

0 and 100

34
Q

Water freezes at ____ F and boils at ______F

A

32F and 212F

35
Q

The SI unit for volume is the ______

A

cubic meter (m3)

36
Q

The SI unit for mass is the _____

A

Kilogram (kg)

37
Q

The SI unit for length is the ____

A

meter (m)

38
Q

The SI unit for temperature is the ___

A

Kelvin

39
Q

Is a number a significant figure if it is not a zero?

A

YEs

40
Q

Is a number a significant figure if it is a zero between nonzero digits?

A

Yes

41
Q

Is a number a significant figure if it’s a zero at the end of a decimal number? (i.e 50. or 16.00)?

A

Yes (2 and 4 sig fig)

42
Q

True or false, a zero is not a significant figure if it is at the beginning of a decimal number?

A

True

43
Q

True or false, a zero is a significant figure if it is used as a placeholder in a large number without a decimal point.

A

False, it is NOT a sig fig if there is no decimal place (850,000 only has two sig fig. 250 only has two sig fig)

44
Q

If a person weighs 178b, what is the body mass in kilograms?

A

80.9kg

45
Q

A rattlesnake is 2.44m long. How many cm is that?

A

244cm

46
Q

How many minutes are in 1.6 days?

A

2,300 min

47
Q

What’s the formula to find density?

A

D=m/v

48
Q

What’s the formula to find volume?

A

V=m/d

49
Q

density is written as:

A

g/mL (liquid and solid)

g/L (gas)

50
Q

Density of water?

A

1.00g/mL

51
Q

Specific gravity is the relationship between what?

A

Between the density of a substance and the density of water

52
Q

Specific gravity is calculated by dividing the density of a sample by the density of water. True or false?

A

True

Chem 4 (15 decks)

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