Unit 1 Chemistry

Study guide: Measurement and Estimation

*Click on each slide to see the answer

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Question 1A

• How many significant digits are there in the number 123.45?

• 5

Question 1B

• How many significant digits are in the number 0.00670?

• 3

Question 1C

• How many significant digits are there in the number 100.0?

• 4

Question 2 A

• Convert the following number into scientific notation: 3,450,700

• 3.45067 X 106

Question 2 B

• Convert the following number into scientific notation: 0.00045

• 4.5 x 10 -4

Question 2C

• Convert the following number into scientific notation: 1,000,000,000.00

• 1 x 10 9

Question 3 A

• Convert this number from scientific notation into standard notation: 6.02 x 105

• 602,000

Question 3B

• Convert this number from scientific notation into standard notation: 9.1 x 10 -3

• 0.0091

Question 3C

• Convert the following number from scientific notation into standard notation: 5.40 x 10 9

• 5,400,000,000

Question 4A

• What metric unit would be most useful for finding the volume of a swimming pool?

• Kiloliter

Question 4B

• What metric unit would be most useful for finding the distance across a room?

• meter

Question 4C

• What metric unit would be most useful for finding the mass of a paperclip?

• gram

Question 5A

• Convert the following: 50 m to Km

• 0.050 Km

Question 5B

• Convert the following: 0.0067 Kg to cg

• 670 cg

Question 5C

• Convert the following: 12 cm to mm

• 120 mm

Question 6A

• Convert the following: 1.3 x 10 -3 mL to L

• 1.3 x 10 -6 L

Question 6B

• Convert the following: 44 cm to m

• 0.44 m

Question 6C

• Convert the following: 7.4 Kg to g

• 7,400 g

Question 7A

• How many variables and controls should you have in any given experiment?

• One variable we are testing, one that will change because of the test and many controls.

Question 7B

• If we were going to test how sunlight affects the growth of a plant what might be some controls that we would need to have?

• Temperature, number of hours of light/dark, amount of food and water, time of day of watering, etc.

Question 7C

• One of the best ways to illustrate data is with a graph, what is a best fit line?

• It is a line that shows the general trend of your data, it gives us the average of the values.

Question 8A

• Round the following to 3 significant digits:30,450

• 30,400

Question 8B

• Round the following to 1 significant digit:0.00010

• 0.0001

Question 8C

• Round the following to 4 significant digits: 1,200,569

• 1,201,000

Question 9A

• Which of the following values is the most precise? 3.02; 3; 3.0

• 3.02

Question 9B

• Why is the hundredths place more precise than the tenths?

• Because it is a smaller value which indicates smaller (more precise) units on your measuring tool.

Question 9C

• An object measures exactly 3.445 cm; which of the following is the most accurate? 3.460; 3.500; 3.437

• 3.437

Question 10A

• What are some tools that we might use to measure volume in the laboratory?

• Beaker, graduated cylinders, Erlenmeyer flasks, burette, etc.

Question 10B

• How are ml and cm3 related to each other?

• 1 ml = 1 cm3

Question 10C

• What is 1000 cm3 equivalent to in liquid volume?

• 1L

Question 11A

• What is the difference between mass and weight?

• Mass does not change while weight is dependant on the pull of gravity so can change depending on your location.

Question 11B

• What types of tools do we use to measure mass?

• Balances such as triple beam or double pan.

Question 11C

• What is the standard unit of measurement for mass?

• Kilogram

Question 12A

• This graph indicates what type of relationship?

• Direct

Question 12B

• What type of relationship does this graph indicate?

• Inverse

Question 12C

• What is the equation for an inverse relationship?

• K = yx