What is the point of having units in the sciences?
They distinguish our numbers as measurements instead of #'s
They distinguish our #'s as pure #'s instead of measurements
There really is no point; it's just a formality.
We use units to tell us we are working with the metric
Simge's guinea pig weighs exactly 560. grams. Which of the following most accurately expresses the weight of Simge's guinea pig in scientific notation?
56 X 10 ^1
5.60 x 10 ^2
5.60 x 10^-2
5.6 x 10 ^2
Why should you wait for temperature to stabilize before taking a reading?
Energy is transferring from the warm system to the cooler 1
Because temperature should always be taken after 5 minutes.
Kinetic energy is apt to change on a whim.
It takes time for the colder particles to transfer
The area of a rectangle can be found by multiplying its length by its width. What is the area of a rectangle that is 5.6 cm in length and 9.24 cm wide? Report your answer with the correct number of significant figures.
51.744 cm squared
51.74 cm squared
52 cm squared
51.7 cm squared
If you are driving at a speed of 55.0 miles per hour, then what is your speed in meters per second? (Hint: 1 mile = 1,609 meters.)
1,470 meters/second
2.06 meters/second
84,400 meters/second
24.6 meters/second
An empty container has a mass of 62.000 grams. You fill it with 24.6 mL of a liquid. The final mass of the container is 81.34 grams. What is the density?
0.786 g/mL
1.27 g/mL
0.79 g/mL
0.7862 g/mL
How many significant figures are in the number 0.220?
Two, only the non-zeros are significant.
Three, the leading zero is not significant, but the rest are
Four, every digit is significant.
None. Any number less than one is not significant.
If you add 50.0 mL of water to a beaker containing 22 mL of water, then how much water do you have in the beaker?
72.0 mL
70 mL
72 mL
70.0 mL
How many significant figures should the product of 1.2 x 1.4592 contain?
Six
Three
Five
Two
Which of the following is an example of a unit?
force
meter
time
volume
The density of mercury is 13.6 g/mL. What is its density in lbs/L? (Hint: 1 lb = 0.454 kg)
6.17 lbs/L
30.0 lbs/L
6,170 lbs/L
30,000 lbs/L
How many mL are in 3.4 L?
3.4 mL
0.0034 mL
3,400 mL
0.34 mL
What is the mass of a liquid with a density of 2.12 g/mL and a volume of 53.0 mL (to the nearest gram)?
0.0400 g
112 g
55.1 g
50.9 g
Which of the following are arranged from smallest unit to largest unit?
km, m, cm, mm
mm, cm, m, km
cm, m, mm, km
cm, mm, m, km
One mole of aluminum atoms has a mass of 27.0 grams. How many grams are in 9.00 moles of aluminum?
0.333 grams
81.0 grams
3.00 grams
243 grams
What is temperature a measurement of?
The amount of heat.
The average kinetic energy of a system.
The change in temperature at equilibrium.
The amount of cold particles in the system.
What is SI units shorthand for?
International System of Units
Imperial System of Units
Scientific Invention Units
Intrinsic System of Units
When measuring temperature, why should you keep your thermometer suspended in the system?
To decrease the chances of breaking the therm or the contain
All of the answers are correct.
To ensure only the temperature of the system is taken.
To avoid taking the temperature of the container.
What are the best units for measuring temperature in a physical science lab?
Kelvin and Celsius.
Fahrenheit and Celsius.
Joules or Fahrenheit.
Calories and Kilojoules.
Use dimensional analysis to convert 4 days into seconds.
345,600 seconds
20,736,000 seconds
14,400 seconds
96 seconds
Which of the following is a conversion factor?
1,000 m per
60 seconds/1 minute
30 lbs.
55-60 hours
What do we call an SI unit that is created by combining base units using algebra?
a multiplied unit
a basic unit
a derived unit
a divided unita
How many significant figures are in 54,050?
5
3
4
1
Which measurement has higher uncertainty?
123.4
123
120
123.45
What is kinetic energy?
Heat energy.
Energy in motion.
Potential energy
The average energy of a system.
You are measuring the volume of a liquid that is 20.31 mL. What are your certain digits in this measurement?
2, 0, and 3
1 only
2 and 0
3 and 1
Which of the following is the closest to a mass of 500 mL of water?
0.500 g
5 kg
500 g
500 kg
What would give you a more precise reading, a yard stick with feet as its smallest unit or a yard stick with inches as its smallest unit?
The yard stick with inches.
It depends on what is being measured.
Both are equally precise.
The yard stick with feet.
In the SI units, what makes the base units special?
They are the largest units in scale.
They are the most basic units from which others are obtained
They are the smallest units in scale.
They are created by combining other units algebraically.
What is the density of a solid that has a mass of 9.2 grams and a volume of 12.3 cm3 ? Would this object float or sink in water?
1.4 g/cm3, sink
1.4 g/cm3, float
0.75 g/cm3, float
3.1 g/cm3, sink