Scientific Notation
The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific notation?
1.54 x 10^⁻¹⁰ m
Accuracy
Which of the following contains 2 significant figures?
0.004 00 L, 0.004 04 L, 0.000 44 L, 0.004 40 L
0.000 44 L
A train travels at a speed of 30 miles per hour. If 1 mile=1.6 kilometers, how fast is the train traveling in kilometers per minute?
0.8 km/min
What is the result of multiplying 2.5 x 10¹⁰ by 3.5 x 10⁻⁷?
8.75 x 10³
Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of 7.32 g for the mass of the standard. These results simply imply that the balance that was used is _____.
Precise
Which of the following measurements is expressed in three significant figures?
0.007 m, 7077 mg, 7.30 x 10⁻⁷ km, 0.070 mm
7.30 x 10⁻⁷ km
What is the quantity 0.0075 meters expressed in centimeters?
0.75 cm
What is the result of adding 2.5 x 10³ and 3.5 x 10²?
2.9 x 10³
Which quantity is represented by the metric system prefix deci-?
0.1
How many significant figures are in the measurement 0.003 4 kg?
two
What is the density of an object having a mass of 8.0 g and a volume of 25 cm³?
0.32 g/cm³
Conversion factors are useful in solving problems in which a given measurement must be expressed in
a. Scientific notation
b. The correct number of significant digits
c. The correct precision
d. Some other unit of measure
D. some other unit of measure
Density is found by dividing _____.
Mass by volume
Express the sum of 1111 km and 222 km using the correct number of significant digits.
1333 km
The chief advantage of the metric system over the other systems of measurement is that it ______.
A. Has more units
b. Is in multiples of 10
c. Is in multiples of 15
d. Is derived from nature itself
b. Is in multiples of 10
Which group of measurements is the most precise? (Each group of measurements is for a different object)
a. 2 g, 3 g, 4 g
b. 2.0 g, 3.0 g, 4.0 g
c. 2 g, 2.5 g, 3 g
d. 1 g, 3 g, 5 g
C. 2 g, 2.5 g, 3 g
When multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in ______.
A. All of the measurements
b. The least and most precise measurements
c. The most precise measurement
d. the least precise measurement
d. The least precise measurement
What is the measurement of 111.009 mm rounded off to four significant digits?
111.0
If the temperature of a piece of steel decreases, what happens to its density?
the density increases