Chapter Two Flashcards
In every measurement, a _____ is followed by a _____
number is followed by a unit
What happens if you don’t put a unit behind your measurements during lab?
You lose a point
The metric system (SI international system) is a decimal system based on ___, used most in the world, and used everywhere by scientist
10
The width of human hair is 0.000 008m is written as _______ in SN
8 x 10(-6)m
4,500,000 in SN is _______
4.5 x 10(6)s.
Going from a small number to a large number means your scientific notation exp. will be positive or negative?
Negative
Going from a large number to a small number means your scientific notation exp. will be positive or negative?
Positive
For scientific notation, do you move the decimal point left or right when going from a large number to a small number??
Left
For scientific notation, do you move the decimal point left or right when going from a small number to a large number?
Right
52,000.0 in SN?
5.2 x 10(4)
0.00378 in SN?
3.78 x 10(-3)
move the decimal so it’s greater than zero and less than _____
10
2.0 x 10(-2) in standard form?
0.020
To turn a scientific notation into standard form and the exp is negative, do you move the decimal left or right?
left
To turn a SN into standard form and the exp is positive, do you move the decimal left or right?
Right
4.5 x 10(3) is:
4,500.0
In measurement, your last digit is obtained by______
estimating
In measurement, if the line is a bit past 2.7 and just before 2.8, your answer should be:
2.75
In measurement, the length is 2.76cm. Identify each number.
2 and 7 are certain (known)
final digit, 6, is estimated (uncertain)
All three digits are still significant, INCLUDING the estimated digit.
In measurement, are all reported numbers significant digits, including the estimated digit?
Yes.
If a line is just past 9.0, it is not 9.0. It is either ____ or ____
9.03 or 9.04 because it has not passed the 9.1 line either
If a line ends right at a line such as 4.5, the final estimation is _____ not _____
4.50, not 4.5
1L = _____ mL
1,000mL
1L = ___ qt
1.06qt
946mL = ___ qt
one quart
1m = ____cm
100
1m = _____ in
39.4 inches
1m = _____yd
1.09yd
2.54cm = ___in
one inch
1kg = ______g
1,000g
1kg = ____lb
2.20lb
454g = ____lb
1 lb
Water freezes at ___ celsius and boils at ____ celsius
0 and 100
Water freezes at ____ F and boils at ______F
32F and 212F
The SI unit for volume is the ______
cubic meter (m3)
The SI unit for mass is the _____
Kilogram (kg)
The SI unit for length is the ____
meter (m)
The SI unit for temperature is the ___
Kelvin
Is a number a significant figure if it is not a zero?
YEs
Is a number a significant figure if it is a zero between nonzero digits?
Yes
Is a number a significant figure if it’s a zero at the end of a decimal number? (i.e 50. or 16.00)?
Yes (2 and 4 sig fig)
True or false, a zero is not a significant figure if it is at the beginning of a decimal number?
True
True or false, a zero is a significant figure if it is used as a placeholder in a large number without a decimal point.
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)
If a person weighs 178b, what is the body mass in kilograms?
80.9kg
A rattlesnake is 2.44m long. How many cm is that?
244cm
How many minutes are in 1.6 days?
2,300 min
What’s the formula to find density?
D=m/v
What’s the formula to find volume?
V=m/d
density is written as:
g/mL (liquid and solid)
g/L (gas)
Density of water?
1.00g/mL
Specific gravity is the relationship between what?
Between the density of a substance and the density of water
Specific gravity is calculated by dividing the density of a sample by the density of water. True or false?
True
