Unit 1 Chemistry Study guide: Measurement and Estimation *Click on each slide to see the answer

1 A B C 2 3 4 5 6 7 8 9 10 11 12

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