11u chemistry practice problems workbook unit 1 answer key

• View
265

5

Embed Size (px)

DESCRIPTION

Â

Text of 11u chemistry practice problems workbook unit 1 answer key

• Francis Libermann Catholic High School

Science Department

SCH 3U1 Course Workbook

• 1/2 1.1.02.1.2 - Significant Digits Homework 2010.pdf(#26)

2011-10-03 17:21:16

name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL Chemistry Unit Significant Digits Science Department

1

Significant Digits Understanding Concepts

KNOWLEDGE THINKING COMMUNICATION APPLICATION

1. Do the following calculations. Express each answer using the correct number of decimal places or significant digits.

a.) 55.671g + 45.78g e.)

!

5.841g " 6.03g

b.) 1.9mm + 0.62mm f.)

!

0.6kg15L

c.) 87.9478L 86.25L g.)

!

17.51g2.2cm3

d.) 0.350mL + 1.70mL + 1.019mL

2. Explain in your own words the difference between accuracy and precision.

• 2/2 1.1.02.1.2 - Significant Digits Homework 2010.pdf(2/2)

2011-10-03 17:21:16

name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL Chemistry Unit Significant Digits Science Department

2

3. Communication: What SI-derived unit of measurement would you use to describe:

a.) the mass of a person __________ d.) length of your desk __________

b.) the mass of a mouse __________ e.) length of the classroom _________

c.) the volume of a glass of orange juice __________

4. Calculate the following.

a.)

!

(3.2"103)(1.52"106) b.)

!

8.435"1033.9"107 c.)

!

1.53"1098"10#4

d.)

!

(6.982"10#5) " (9.7"108) e.)

!

(4.81"103)(7.59"10#5)(9.2"108)

5. Record the number of significant digits in each of the following values:

a.) 3.545 b.) 308 c.) 0.000876

d.) 1.000300 e.) 4.20!104 f.) 0.00410

g.) 1 000 000 000 h.) 1 000 000.00 i.) 0.0300280

j.) 40.00100

• name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL

Chemistry Unit Topic Science Department

1

Separation of Mixtures Understanding Concepts

KNOWLEDGE THINKING COMMUNICATION APPLICATION

Taking advantage of various physical and chemical properties, how would you separate the following mixtures into their various components?

a.) sand and water

b.) sugar and water

c.) oil and water

d.) sand and gravel

e.) A mixture of heptane (boiling point 98C) and heptanol (boiling point 176C)

• name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL

Chemistry Unit Topic Science Department

2

f.) A mixture of iodine solid and sodium chloride (Hint: Iodine is not soluble in water)

g.) A mixture of lead and aluminum pellets

h.) A mixture of salt and iron fillings

• name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL

Chemistry Unit Observing Matter Science Department

1

Observing Matter Understanding Concepts

KNOWLEDGE THINKING COMMUNICATION APPLICATION

Knowledge/Understanding

1. Identify each property as either physical or chemical.

a.) Hydrogen gas is extremely flammable

__________________ c.) Chlorine gas is pale green in colour

__________________

b.) The boiling point of ethanol is 78.5C

__________________ d.) Sodium metal reacts violently with water

__________________

2. How can you tell the difference between a physical and chemical change?

3. Name the property that each change depends on. Then classify the property as either chemical or physical.

a.) You separate a mixture of gravel and road salt by adding water to it.

b.) You add baking soda to vinegar, and the mixture bubbles and froths.

c.) You use a magnet to locate iron nails that were dropped in a barn filled knee-deep with straw.

d.) Carbon dioxide gas freezes at a temperature of 78C.

• name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL

Chemistry Unit Observing Matter Science Department

2

e.) You recover salt from a solution of saltwater by heating the solution until all the water has evaporated.

f.) The temperature of a compost pile rises as the activity of bacteria inside the pile increases.

4. Use the terms accuracy and precision to describe the results on the dartboards shown below. Assume that the darts represent data and the bull-eye represents the expected value.

Exp I: _____________________________________

Exp II: _____________________________________

Exp III: _____________________________________

Exp IV: _____________________________________

5. Examine the containers shown below.

• name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL

Chemistry Unit Observing Matter Science Department

3

a.) What volume of liquid does each container contain? Be as accurate and precise as possible in your answers.

b.) Assume that the liquid in all three containers is water. If the flask and the graduated cylinder are emptied into the beaker, what is the total volume of water in the beaker? Report your answer to the correct number of significant digits.

c.) Which container is the best choice for measuring volume in a laboratory? Explain why.

6. Convert the following.

a.) 10 kg g c.) 52 mL cm3

b.) 22.3 cm m d.) 1.0 L cm3

• name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL

Chemistry Unit Observing Matter Science Department

4

7. Identify the number of significant digits in each value.

a.) 0.002 cm _________ e.) 4.0003 mL _________

b.) 3107 km _________ f.) 5.432109 km2 _________

c.) 5 g _________ g.) 91 511 L _________

d.) 8.6109 m3 _________ h.) 0.003 001 00 _________

a.) Explain why the value 5700 km could have two, three or four significant digits.

b.) Write 5700 km with two significant digits. _________________

c.) Write 5700 km with four significant digits. _________________

9. Complete each calculation. Express your answer to the correct number of significant digits.

a.)

4.02mL + 3.76mL + 0.95mL d.)

2 0.3+ 6 7

b.)

(2.7102m) (4.2310

2m) e.)

(6.853103L) + (5.4010

3L)

c.)

5092kg 23L f.)

(572.3g + 794.1g) (24mL + 52mL)

10. Round each value to the given number of significant digits.

a.) 62 091 to three significant digits

_____________ c.) 583 to one significant digit

_____________

b.) 27 to one significant digit _____________ d.) 17.25 to three significant digits

_____________

• name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL

Chemistry Unit Observing Matter Science Department

5

11. A plumber installs a pipe that has a diameter of 10 cm and a length of 2.4 cm. Calculate the volume of water in (cm3) that the pipe will hold. Express your answer to the correct number of significant

digits. NOTE: The formula for the volume of a cylinder is

V = r 2h , where r is the radius and h is the height or length.

12. During an investigation, a student monitors the temperature of water in a beaker. The data from the investigation are shown in the following table.

a.) What was the average temperature of the water? Express your answer to the appropriate number of significant digits.

b.) The thermometer that the student used has a scale marked at 1 intervals. Which digits in the table are estimated?

13. Identify each change as either physical or chemical.

a.) Over time, an iron swing set becomes covered with rust. ______________________

b.) Juice crystals disappear when they are stirred into a glass of water. ___________________

c.) Litmus paper turns pink when exposed to acid. _____________________

d.) Butter melts when you spread it on hot toast. _____________________

Time (min) Temperature (C)

0.0 25

1 24.3

2 24

3 23.7

4 23.6

• name: date:

KNOWLEDGE THINKING COMMUNICATION APPLICATION FRANCIS LIBERMANN CATHOLIC HIGH SCHOOL

Chemistry Unit Observing Matter Science Department

6

Inquiry

Recommended

Documents
Documents
Documents
Documents
Documents