nde-ewo (pronounced enday aywo)

nde-ewo(pronounced enday aywo)

• Turn in your Density Lab in the basket by the calculator caddy

• Get a calculator• Take out a sheet of

notebook paper

• Express the following to the correct number of significant figures

a) 334.54 g + 198 g

b) 34.1 grams / 1.1 mL

c) 2.11 x 103 joules /34 sec

d) 30 000 km/24.2600 hrs

e) 1.45 mL – 0.0003 mL

Thursday, September 13, 2012

Check Yourself

1. 533 g

2. 31 g/mL

3. 62 joules/sec

4. 1000 km/hr

5. 1.45 mL

GraphingGraphing is an important tool for expressing data so that it is easier to read and interpretRules for graphing:--place the manipulated/independent variable (the one that was changed) on the x axis.--place the dependent/responding variable (the results of that change) on the y axis.(dry mix)

DRY

MIX

y scale = largest y value – smallest y value x scale = largest x value – smallest x value# of lines on the y axis # of lines on the x axis

The graph should cover at least ¾ of the grid

Rules:

• Each person will have their own paper.

• Answer must be written correctly on your paper

• Use appropriate units (where it applies)

Question #1

• Roll the die then round to the correct number of significant figures in the following:

a) 0.58742005

b) 30 024 589

Question #2

• Roll the die then round to the correct number of significant figures in the following: :

a) 900007.0

b) 0.20470810

Question #3

• Calculate. Express your answer in the proper # of significant figures.

a) 1.44 m X 2.467 m =

b) 7082 ÷ 42 =

Question # 4

• Calculate. Express your answer in the proper # of significant figures or decimal places.

a) 7182 ÷ 52 =

b) 55.46 g – 36.2 g =

Question # 5

• Express in standard scientific notation.

a)0.00382

b)456 3000

Question # 6

• Express in normal notation.

a)4.53 X 105

b)2.1 X 10-4

Question #7

• Draw the metric conversion grid.

( Hint…King Henry….)

Question # 8

• Calculate density. Show all steps and units.

mass 537 g, volume 1002 mL

Question #9

• Calculate mass. Show all steps and units.

density 7g/mL, volume 222 mL

Question # 10

• Calculate volume. Show all steps and units.

density 3 g/mL, mass 2100 g

Question # 11

• What is the difference between accuracy and precision?

Question #12

• Tell if the following data is accurate, precise, both or neither.

A nail has a length of 3.04 cm.Measurements recorded were:

2.01, 2.02, 2.01, 2.03

Question #13

• Give the appropriate unit to measure the following:

a) The weight of a minivan

b) The volume of gas in a car’s tank

Question #14

• Give the appropriate unit to measure the following:

a) The length of a bar of soap

b) The volume of a tube of toothpaste

Question # 15

Answer the following questions:

a)How many decigrams are in a hectogram?

b)How many centimeters are in a kilometer?

Question # 16

The lines in the picture just touch the rim of the penny. Record the diameter of the penny in centimeters, recording the correct number of significant figures.

Answers

Question # 1

You rolled a…

Your answer should be

1 0.6

2 0.59

3 0.587

4 0.5874

5 0.58742

6 0.587420

a) b)

You rolled a…

Your answer should be

1 30 000 000

2 3.0 x 10 7

3 3.00 x 10 7

4 30 020 000

5 30 024 000

6 30 024 600

Question # 2

You rolled a…

Your answer should be

1 900000

2 9.0 x 10 5

3 9.00 x 10 5

4 9.000 x 10 5

5 9.0000 x 10 5

6 900007

a) b)

You rolled a…

Your answer should be

1 30 000 000

2 3.0 x 10 7

3 3.00 x 10 7

4 30 020 000

5 30 024 000

6 30 024 600

Question #3

a) 3.55 m

b) 170

Question #4

a) 140

b) 19.3

Question #5

a) 3.82 x 10 -3

b) 4.563 x 10 6

Question #6

a) 45300

b) 0.00021

Question #7

k h da BASE d cm

kilo hecto deka deci centimilli

Question #8

D = m/V = 537 g/1002 mL= 0.536 g/mL

Question #9

M = DV = (7 g/mL)(222 mL) = 2000 g

Question #10

V = m/D = 2100 g/ (3 g/mL) = 700 mL

Question #11

Accuracy: how close values are to the known (true) value

Precision: how close values are together

Question #12

Precise

Question #13

a) kg

b) L

Question #14

a) cm

b) mL

Question #15

a) 1000 or 103

b) 100 000 or 105

Question #16

1.92 cm

(make sure your answer has a 100ths place value; it doesn’t have to be a 2)