Unit 3 Measurement and Density

Ticket to Test

· Learning Targets      

· IC 3.1.  I can convert numbers in scientific notation and standard notation.

· IC 3.2.  I can select and correctly use appropriate tools for determining mass, volume, and temperature.

· IC 3.3.  I can read the meniscus of a graduated cylinder and record the volume correctly.

· IC 3.4.  I can discriminate between independent and dependent variables and recognize the correct placement of variables on the axes of a graph.

· IC 3.5.  I can differentiate between accuracy and precision.

· IC 3.6.  I can calculate the mass, volume, and density of an object from real world data.

· IC 3.7.  I can predict whether an object floats or sinks in a liquid based on density.

· IC 3.8.  I can identify the density of water as 1 g/mL at room temperature.

· IC 3.9.  I can describe density as a physical property that depends only on the type of substance, not the amount of substance.

· IC 3.10.  I can convert between metric measurements

· IC 3.11.  I can interpret metric prefixes in terms of relative size

· IC 3.12.  I can convert temperature between Celsius and Kelvin scale

· IC 3.13.  I can calculate the volume of objects by displacement and by formula (LxWxH)

IC 13.14.  *I can…apply significant figures correctly to scientific measurements.

IC 13.15.  *I can…identify the number of significant figures in a measurement.

Steps to Success:

1. Go to the website www.chemastery.weebly.com

2. View the tutorials.

3. Answer the questions.

4. Turn them in to your instructor 24 hours before you are ready to take the test (this will give your instructor time to grade your work before you retake the test).

1. Scientific Notation - Watch the Podcast    In this podcast you will learn to:        - Express numbers in the correct scientific notation.        - Convert from scientific to decimal notation.        - Convert from decimal to scientific notation.                - Use a calculator to solve problems in scientific notation.

Answer these questions WHILE watching the podcast. Pause the podcast when necessary.

Correct Form? (C = correct / I = incorrect)

9.2 x 102

_____

0.4 x 10-14

_____

1.8 x 25

_____

860 x 10-3

_____

9.898989887 x 101 _____

Problem Set One—Change from scientific notation to decimal notation:

a.________________________________________________________________________

b.________________________________________________________________________

c.________________________________________________________________________

d.________________________________________________________________________

e.________________________________________________________________________

Problem Set Two—Change from decimal notation to scientific notation:

a.________________________________________________________________________

b.________________________________________________________________________

c.________________________________________________________________________

d.________________________________________________________________________

e.________________________________________________________________________

Sample Problem: Volume of block

Answer the following questions AFTER viewing the podcast #1:

Scientific Notation WS 1:

Change the following numbers in decimal notation to scientific notation.

0.00004____________________________________

0.0025_____________________________________

310000____________________________________

Change the following numbers in scientific notation to decimal notation.

5.93 x 10-5 _________________________________

3 x 104 ____________________________________

1.5 x 103 __________________________________

Make the following calculations using your calculator.

1.3 x 103 + 2.5 x 102

2.6 x 104 - 1.7 x 103

(1.5 x 102)(2.3 x 10-5)

4.4 x 105

2.0 x 10-2

2. The Metric System - Watch the Podcast       In this podcast you will learn to:        - Define length, mass, volume, time and temperature.        - Name the SI Unit for each and an instrument used to measure each.        - Make measurements using the correct unit as well as the correct number of significant digits HONORS

ONLY!

Answer the following questions while watching the first podcast of #2:

Answer the following questions AFTER viewing podcast 2a:

View podcasts 2b and 2c (reading the meniscus and reading a graduated cylinder), then answer the following questions:

What mass does the balance above read? Remember to record your answer to two places past the decimal.

____________________________________

What mass does the balance above read? Remember to record your answer to two places past the decimal.

____________________________________

3. Independent and Dependent Variables - Watch the Podcast       In this podcast you will learn to:        -Identify the independent and dependent variables.        -Identify the control

Answer the following questions while AFTER viewing podcast of #3:

For the following examples, identify

1) The dependent variable

2) The independent variable

3) The experimental condition(s)/experimental group(s)

4) The experimental control/control group

Example 1

A researcher is studying the effect of sleep on aggression, thinking that less sleep will lead to more aggression. She has some people sleep 6 hours per night, some people sleep 3 hours per night and some people sleep as much as they want. She then monitors aggressive behavior during basketball games among participants.

1) ____________________________________________

2) ____________________________________________

3) ____________________________________________

4) ____________________________________________

Example 2

A researcher is curious to find out what effect classical music has on people’s level of relaxation (as measured by heart rate). He suspects that listening to classical music will make people feel more calm and relaxed. He lets one group listen to classical music for one hour. He lets another group sit in a quiet room for one hour (i.e they hear no music). After one hour, he monitors the heart rate of each participant to measure their level of relaxation.

1) ____________________________________________

2) ____________________________________________

3) ____________________________________________

4) ____________________________________________

Example 3

A researcher conducts an experiment to assess the effects of alcohol on people's sense of balance. He divides his subjects into three groups: in one group the participants drink one ounce of alcohol, in another they drink two ounces of alcohol and in a third group the participants drink soda. He then watches as each participant tries to walk on a straight line from one corner of the room to the next and notes how many times they stumble outside the line.

1) ____________________________________________

2) ____________________________________________

3) ____________________________________________

4) ____________________________________________

4. Metric Conversions - Watch the podcast

       In this podcast you will learn to:

- Define metric prefixes mega, kilo, deci, centi, milli, and micro.        - Use conversion factors to perform one and two step metric conversions.

Answer these questions WHILE watching podcast #4. Pause the podcast when necessary.

Metric Prefixes

One _______________ thing equals _______________ _______________things.

Prefix Questions

1. _______________ m = 1 km

2. _______________ km = 1 m

Which is larger?

3. milliliter or centiliter

4. kilogram or megagram

5. millimeter or kilometer

6. a penny = 1 _______________dollar

7. a dime = 1 _______________dollar

8. a megabuck = _______________dollars

9. a kilopenny = _______________ dollars

Prefix and Base Unit Questions

1. _______________

2. _______________

3. _______________

4. _______________

5. _______________

Conversions:

Convert 152 cm to m

conversion factor— a ____________ of fact expressed as a_____________ equaling _______________

Fact: 1 m = 100 cm

1 m

100 cm

100 cm 1 m

Convert __________kg to grams

Convert __________μs to ds

___________mm = ______ km

Problem Set One

1)___________________________

2)___________________________

3)___________________________

4)___________________________

5)___________________________

How many yards are in km?

Chemistry Quiz

CR1____________ CR2__________ 1__________ 2___________

3___________ 4 ____________ 5___________

Answer these questions AFTER viewing podcast #4:

Convert these:

0.057 m = ____________ km

56 mL = _____________ cm3

13 cm3 = ____________ mL

507 cL = _____________ L

3.004 L = ____________ mL

29 kg = _____________ cg

86 kg = ____________ g

0.546 km = _____________ μm

24 mL = ____________ L

69,000 dg = _____________ kg

56,000 mg = ____________ kg

56 km = ____________ mm

32 cm = ____________ m

5. Separation of Mixtures - Watch the podcast

In this podcast you will learn to:       

- Identify various ways to separate mixtures.       

- Define density.       

- Solve density problems.

Answer these questions WHILE watching podcast #5. Pause the podcast when necessary.

Problem Set 1

1

2

3

Problem Set 2

1

2

3

Chemistry Quiz

CR1____________ CR2__________ 1__________ 2___________

3___________ 4 ____________ 5___________

Answer these questions AFTER viewing podcast #5:

Problem Set 1

1. Given a mass of 12 g and a volume of 3 mL, calculate the density.

2. What is the mass of 50 mL of water?

3. Given that the density of iron is 7.9 g/cm3, what would be the volume of a 15.8 g piece of iron?

Problem Set 2

1. Find the density of a block with a length of 4.0 centimeters, a width of 3.0 centimeters, a height of 2.0 centimeters, and a mass of 36 grams.

2. Find the density of an 8.0 g rock if the water in a graduated cylinder rises from 20.0 mL to 23.5 mL when the rock is placed into the graduated cylinder.

3. You have a piece of silver with a mass of 31.5 g. Silver has a density of 10.5 g/cm3. What would be the new level of water if this piece of silver is placed into 15 mL of water?

Density WS 1

1. Given a mass of 14 g and a volume of 28 mL, calculate the density.

2. What is the mass of an object with a density of 4.0 g/cm3 that displaces 3.0 cm3 of water?

3. Given that the density of iron is 11.35 grams per centimeter cubed, what would be the volume of a 1.1 gram piece of iron?

4. Find the density of a block with a length of 8.0 cm, a width of 4.0 cm, a height 2.0 cm, and a mass of 32 g. Would this block float or sink in water?

5. You have two pieces of jewelry. One of them is supposed to be pure silver. The first piece has a mass of 20.0 g and the other piece has a mass of 44.0 g. Both pieces displace 4.0 mL of water. Silver has a density of 10.5 g/cm3. Which piece is actually silver?

Density WS 2

1. Density describes the relationship between the ____________ and____________ of a sample of a substance.

2. The most common units for density are _______ and _______.

3. The density of water is ____________.

4. A small beaker contains 55.0 mL of water. What would be the mass of the water?

5. Object A has a mass of 500 g and a density of 5.0 g/cm3. Object B has a mass of 650 g and a density of 6.5 g/cm3.

a. Which object would displace the most liquid? EXPLAIN.

b. Could the two objects be made of the same substance? EXPLAIN.

6. The density of silver is 10.5 g/cm3. What will be the volume of a piece of silver having a mass of 31.5 g?

7. A sample of iron occupies a volume of 10.0 cm3. If the density of iron is 7.9 g/cm3, what is the mass of the sample?

6.  The Concept of Density  - Watch the podcast           

In this podcast you will learn to:

-Predict whether an object floats or sinks in a liquid based on density.            -Identify the density of water as 1 g/mL at room temperature.

Answer these questions AFTER viewing podcast #6:

Densities of Some Common Substances

Liquid

Gas

Solid

Name

Density (g/ml)

Name

Density (g/ml)

Name

Density (g/ml)

Carbon Tetrachloride

1.5

Air

.0013

Ash wood

.65

Formalin

.815

Carbon dioxide

.0018

Balsa wood

.37

Methanol

.796

Helium

.00018

Glass

2.6

Sulfuric Acid

1.63

Hydrogen

.00009

Oak wood

.68

Water

1.0

nitrogen

.0012

tin

7.18

Arrange the substances in the columns above in order of their densities. Begin with the least dense and end with the most dense.

Liquid

1__________________2________________3____________________4___________________5__________________

Gasses

1__________________2________________3____________________4___________________5__________________

Solids

1__________________2________________3____________________4___________________5__________________

Density and Floating – A substance will float if the density is less than or equal to the density of the fluid it is immersed.

TRUE OR FALSE – Write true if the statement is true on the line in front of the number. If it is false – change the underlined word to make it true

____________________1. A block of ash wood will float in methanol

____________________2. Carbon tetrachloride will sink in sulfuric acid.

____________________3. To float in air, a blimp could be filled with helium.

____________________4. The same blimp might also be filled with carbon dioxide

These four balloons escaped from the seller in the park. Each one is filled with one of the gases listed on the preceding page. In the spaces write the name of the gas you think each balloon contains.

SHAPE \* MERGEFORMAT

1.________________________________________

2. ________________________________________

3.________________________________________

4. ________________________________________

If a beaker contains two different liquids, water and carbon tetrachloride. Which liquid would float of top? How wold you know?________________________________________________________________________________

If you were making a model airplane, which of the three woods would you use?

_________________________________________________________________________________

Which state of matter is the least dense? How can you tell?

_________________________________________________________________________________

_________________________________________________________________________________

Three blocks of wood – ash, oak, and balsa, are floating in water . The blocks are all exactly the same size and shape. Which sinks the deepest in to the water?

_________________________________________________________________________________

7.  Temperature Conversions  - Watch the podcast        

In this podcast you will learn how to:

-Convert Celsius to Kelvin         -Convert Kelvin to Celsium

Answer these questions AFTER viewing podcast #7:

Ko= Co + 273

Convert the following to Kelvin

1) 0o C ________ 2) -50o C ________ 3) 90o C ________ 4) -20o C ________

Convert the following to Celsius

5) 100o K ________ 6) 200o K ________ 7) 273o K ________ 8) 350o K ________

9.) What is “Absolute Zero”? EXPLAIN.

8.  Accuracy and Precision - Watch the podcast

In this podcast you will learn how to:        

-Differentiate between accuracy and precision

Answer these questions AFTER viewing podcast #8:

1. Three students made multiple weightings of a copper rod, each using a different balance. The correct mass of the cylinder had been previously determined to be 47.32g. Describe the accuracy and precision of each student’s measurements.

Marie

Albert

Ernest

Weigh 1

47.13

47.45

47.95

Weigh 2

47.94

47.39

47.91

Weigh 3

46.83

47.42

47.89

Weigh 4

47.47

47.41

47.93

Marie:

Albert:

Ernest:

2. Three scientists measure the standard meter bar kept at the International Bureau of Standards. Their measurements are 1.09 m, 1.09 m, and 1.08 m. Are their measurements accurate, precise, or both? Why?

3. An archer shoots three arrows at a target and each lands within 1 cm of the others but none of the arrows is within 30 cm of the bull's-eye. Discuss both the accuracy and the precision of the archer.

9.  Significant Figures - Watch the podcast

-In this podcast you will learn how to:

  -Apply significant figures correctly to scientific measurements - HONORS ONLY        -Identify the number of significant figures in a measurement - HONORS ONLY

Answer these questions WHIILE viewing podcast #9, you will need to pause the podcast:

State the rules for determining Significant Figures in a measurement

1

2

3

4

5

Answer these questions AFTER viewing podcast #9, you will need to pause the podcast:

Lecture Link #3

Lecture Link #2

Lecture Link #1

Lecture Link #4

Lecture Link #5

Lecture Link #6

3

4

2

1

Lecture Link #7

Lecture Link #8

Lecture Link #9