Chapter 3 Chemistry Test #2

Which of the following measurements contains two significant figures?

0.000 44 L

What quantity is represented by the metric system prefix deci-?

0.1

What is the measurement 1042 L rounded off to two significant digits?

1.0 x 10^3 L

The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific notation?

1.54x 10^-10 m

What is the measurement 111.009 mm rounded off to four significant digits?

111.00mm

Express the product of 2.2 mm and 5.000 mm using the correct number of significant digits

11mm^2

Express the sum of 7.68 m and 5.0 m using the correct number of significant digits

12.7

Express the sum of 1111 km and 222 km using the correct number of significant digits

1333 km

Which group of measurements is the most precise? (Each group of measurement is or a different)

2 g, 2.5 g, 3 g

What is the volume of a salt crystal measuring 2.44 x 10^-2 m by 1.4 x 10^-3 m by 8.4 x 10^-3 m ?

2.9 x 10^-7 m ^3

What is the result of adding 2.5 x 10^3 and 3.5 x 10^2 ?

2.9 x 10^3

In the measurement 0.503 L, which digit is the estimated digit

3

Which of the following measurement (of different masses) is the most accurate?

3.000 000 g

Express the product of 4.0 x 10^-2 m and 8.1 x 10^2 m using the correct number of significant digits

3.2 x 10^1

The expression of 5008 km in scientific notation is _____

5.008 x 10^3 km

Which of the following measurements is expressed to three significant figures?

7.30 x 10^-7 km

What is the result of multiplying 2.5 x 10^10 by 3.5 x 10^-7 ?

8.75 x 10^3

The closeness of a measurement to its true value is a measure of its _____

accuracy

When a test instrument is calibrated, does its accuracy, precision, or reliability improve?

accuracy

How many significant figures are in the measurement 811.40 grams?

five

What is the metric system prefix for the quantit 0.000 001

micro-

Three different people weigh a standard mass of 2 g on the same balance. Each person obtains 7.32 grams for the mass of the standard. These results imply that the balance that was used is

precise

When multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in

the least precise measurement

How many significant figures are in the measurement 40,500 mg?

three

How many significant figures are in the measurement 0.003 4 kg?

two