1st Quarter Reviewer: S.Y. 2011-2012 Ver 3

Hi there. Chemistry exam is hours away... chill, relax, chillax, whatever. Here's another reviewer to help you calm your nerves.

Time Frame: 30 minutes
Source:http://cwx.prenhall.com/bookbind/pubbooks/hill/chapter1/multiple1/deluxe-content.html

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1.	Which of the following is not an example of matter?
	air
	iron
	heat
	water
	wood
2.	A person tries to start his car in the morning and it does not start. He thinks that the car may be out of gas. His idea concerning why the car does not start is an example of:
	a hypothesis
	an experiment
	law
	theory
	data
3.	Which of the following represents a change of mass?
	An astronaut is in orbit about the earth and is in weightless condition.
	An astronaut is walking on the moon and can jump great distances.
	An astronaut takes off in a rocket ship and feels the effects of acceleration.
	The astronaut is in a rapidly dropping elevator at the Space Center.
	An astronaut goes on a diet and loses five kilograms.
4.	Which of the following is a homogeneous mixture?
	helium gas used to fill a balloon
	high octane gasoline
	Italian salad dressing
	nails in water
	sodium chloride
5.
6.	Convert 50.0 km to m.
	5.00 x 103 m
	5 x 104 m
	5.00 x 104 m
	20.0 m
	5.00 x 10-2 m
7.	Convert 87.6 µg to kg.
	8.76 x 104 kg
	8.76 x 10-8 kg
	8.76 x 108 kg
	8.76 x 10-5 kg
	0.0876 kg
8.	Convert 0.0962 km/min to m/s.
	9.62 m/s
	1.60 m/s
	1.60 x 10-3 m/s
	2.67 x 10 -2 m/s
	5.76 x 103 m/s
9.	Convert 10.1 meters per second to miles per hour.
	6.29 x 10-3 mi/h
	1.43 x 103 mi/h
	36.4 mi/h
	377 mi/h
	22.6 mi/h
10.	Convert 87.4 cm² to m².
	8.74 x 10-3 m²
	8.74 x 10³m²
	8.74 x 10+5m²
	0.874 m²
	8.74 x 10-5m²
11.	Convert 46.4 m³ to liters.
	46.4 L
	4.64 x 104 L
	4.64 L
	4.64 x 10² L
	4.64 x 10-8 L
12.	Which of the following is the greatest length?
	a 1.5 m chain
	a 1 dm pencil
	a 5.0 cm gold chain
	2500 grams of sugar
	a yardstick
13.	How many significant figures are there in this measured quantity? 0.040930
	3
	4
	6
	5
	7
14.	How many significant figures are there in this measured quantity? 5.010 x 10³
	5
	2
	6
	4
	3
15.	Express the following measured quantity in exponential notation. 2800 meters
	28.00 x 10² m
	2.8 x 10³ m
	2.80 x 10³ m
	2.800 x 10³ m
	2.800 x 10-3 m
16.	Express the following number in exponential notation rounded to three significant figures. 87,660
	8.77 x 10-4
	8.77 x 104
	0.877 x 105
	876.60 x 102
	8.76 x 104
17.	Perform the indicated operation and give an answer with the proper number of significant figures. 48.2 m + 3.87 m + 48.4394 m
	101 m
	100.4 m
	100.51 m
	100.5094 m
	100.5 m
18.	Perform the indicated operation and give an answer with the proper number of significant figures. 451 g - 15.46 g
	466 g
	435.54 g
	435.5 g
	4.4 x 102 g
	436 g
19.	Perform the indicated operations and give an answer with the proper number of significant figures. (33.58 x 1.007) / .00705
	4796
	4800
	4796.462411
	4.8 x 103
	4.80 x 103
20.	Perform the indicated operations and give an answer with the proper number of significant figures. (2.023 - 1.8 x 10-3) / 1.05 x 104
	1.92495 x 10-4
	2.02
	1.9 x 10-4
	1.92 x 10-4
	0.212
21.	What is the density of a salt solution if 50.0 mL has a mass of 57.0 g?
	1.14 g/mL
	2.85 x 103 g/mL
	3.51 x 10-4 g/mL
	0.877 mL/g
	1.14 g/L
22.	What is the mass, in kg, of 2.75 liters of the liquid glycerol, which has a density of 1.26 g/mL?
	0.458 kg
	2.18 kg
	3.47 x 103 kg
	3.47 kg
	0.00347 kg
23.	What is the volume of 5.79 mg of gold? The density of gold is 19.3 g/cm³.
	3,333 cm³
	0.112 cm³
	3.00cm³
	3 x 10-4 cm³
	3.00 x 10-4 cm³
24.	A rectangular block measures 3.00 cm by 1.25 cm by 1.50 cm and has a mass of 28.12 g. What is the density?
	9.37 g/cm³
	6.25 g/cm³
	7.50 g/cm³
	5.00 g/cm³
	0.200 g/cm³
25.	Dust from air that is not significantly polluted is deposited ("dustfall") at a typical rate of 10 tons/mi² per month. What is this dustfall expressed in mg/m² per hour? Assume a month of 30 days.
	2.44 x 10-3 mg / m²·hr
	4.87 mg / m²·hr
	4.87 x 10-3 mg / m²·hr
	12.6 mg / m²·hr
	7.83 mg / m²·hr

1st Quarter Reviewer: S.Y. 2011-2012 Ver 2

Time Frame: 10 mins

Source: http://www.avon-chemistry.com/nuclear_practice.htm

Hi everyone! This is a quick test for chapters 3 and 4 of our textbook. Have fun.

MULTIPLE CHOICE:

1.      Cathode rays are:

A

negatively charged particles

B

positively charged particles

C

nuclei of a helium atom

D

fast moving neutrons

2.     The neutral atoms of all of the isotopes of the same element have:

A

the same mass numbers

B

equal numbers of neutrons

C

the same number of electrons

D

different number of protons

3.      Which statement is true about an isotope?

A

There can be more than one type of isotope for an element.

B

All isotopes for an element has the same number of protons and the same mass number.

C

Isotopes can have different numbers of protons.

D

All isotopes are not radioactive.

4.      How many electrons are in an oxygen atom?
 

A

2

B

6

C

8

D

10

5.  Copper has an atomic mass of 63.5 grams per mole. Why is the atomic mass NOT a whole number?
 

A

All copper atoms have identical chemical properties.

B

The fractional number results from the fact that protons and neutrons have different masses.

C

Every copper atom has an atomic mass of 63.5 amu.

D

There are at least two naturally occurring isotopes of copper.

6.      Which symbol represents an atom that contains the largest number of neutrons?

 

A

U-235

B

Pa-231

C

Np-239

D

Pu-240

E

U-239

7. The number of protons in fluorine-23 is 

A

6

B

8

C

9

D

14

E

23

8. Find the average mass of an element if the relative amounts are as follows:
   Isotopic Mass: Percentage:
   75 amu ----------- 2.3%
   77 amu ----------- 15.7 %
   78 amu ----------- 4.5 %
   80 amu ----------- 7.1 %
   81 amu ----------- 70.4 % 

A

77.25 amu

B

78.01 amu

C

79.09 amu

D

80.03 amu

E

81.09 amu

9. Which of the following is NOT true about chemical reactions? 

A

After a chemical reaction, the protons and neutrons within the atom have not changed.

B

After a chemical reaction, there are new bonds formed while others bonds were broken.

C

After a chemical reaction, an electron may enter the nucleus and change a proton to a neutron.

D

After a chemical reaction, the boiling points and melting points of the new products are different.

10. How many protons, neutrons, and electrons are in one atom of Pb-212 (atomic number 82)?

A

212 p+, 82 n0, 212 e-

B

82 p+, 212 n0, 212 e-

C

82 p+, 212 n0, 82 e-

D

82 p+, 82 n0, 212 e-

E

none of the above are correct

Did you have fun? Here are the answers!

1. a

2. c

3. a

4. c

5. d

6. e

7. d

8. d

9. c

10. e

1st Quarter Reviewer S.Y. 2011-2012

Taking exams can be a time for stress and anxiety if you have not studied during the quarter; you will find yourself cramming for each test and studying late into the night. With a little time management, you not only minimize stress at exam time, but maximize productivity and results!

... And with this, I have prepared a reviewer for all you Chemistry Pals out there! All you have to do is take this mock test within a time limit. Get into the exam mode by clearing your work desk of everything except your paper and pen.

METRIC CONVERSION WORKSHEET

Time Limit: 30 minutes
Source: Chemistry Text

Here's a practice worksheet for Metric Conversion.
Answers are shown on the right side of every item :)

1. One-Step Metric Conversions
1. 34.5 cm to m (0.345 m)
2. 56.8 km to m (56800 m)
3. 987 mm to m (0.987 m)
4. 0.981 seconds to centiseconds (98.1 cs)
5. 0.0872 kg to g (87.2 g)
6. 75600 microliters to liters (0.0756 L)
7. 9800 liters to kiloliters (9.8 kL)
8. 0.560 seconds to microseconds (560,000 µs)
9. 7960 centigrams to grams (79.6 g)
10. 89.5 megawatts to watts (89,500,000 watts)

2. Two-Step Conversion (When in doubt, first convert to the standard grams, liters, seconds, meters…)
1. 34.5 km to cm (3,450,000 cm)
2. 56800 cm to km (0.568 km)
3. 987,000 mm to km (0.987 km)
4. 0.981 kiloseconds to centiseconds (98,100 cs)
5. 0.0872 kg to mg (87,200 mg)

3. Numerator and Denominator Conversions
1. 30.0 m/s to km/min (1.8 km/min)
2. 15.6 km/hr to m/s (4.33 m/s)
3. 0.0098 L/min to mL/s (0.16 mL/s)
4. 46.7 kg/hr to g/sec (13.0 g/sec)
5. 2.3 km/hr to m/day (55,200 m/day)

4. Area and Volume Conversions
1. 5.0 mm³ to m³ (0.00000005 m³)
2. 67.3 µm² to m² ( 6.73 x 10^-11 m²)

MOCK TEST FOR CHAPTERS 1 AND 2

Time Limit: 25 minutes
Source: http://www.regentsprep.org/regents/core/questions

Hello fellow Chemistry lovers! This part covers Chapters 1 and 2 of your text book.

In case you've read the two chapters five times already, well here's a supplementary exercise for you. Try to answer this in 25 minutes... Have fun!

. Multiple choice (Answer to the questions will follow)

1. A hypothesis is...
a. a tentative explanation for a natural phenomenon
b. a description of a pattern or relationship in experimental data
c. a theory that has been proved
d. obeyed under any circumstances

2. The statement, "A chemical reaction never creates a product that weight more or less than the reactants", is based on three centuries of experimental observation. The statement is an example of:
a. a hypothesis b. a theory c. a datum d. a law

3. A number of people become ill after eating dinner in a restaurant. Which of the following statements is a hypothesis?
a. People got sick whether the oysters were raw or cooked.
b. Bacteria in the oysters may have caused the illness
c. Everyone who ate oysters got sick
d. The cook felt really bad about it
e. Symptoms include nausea and dizziness

4. The number of significant digits in 650600000 is
a. at most 4 b. exactly 9 c. exactly 3 d. at least 9 e. exactly 4

5. Rounded correctly, 2.000 cm x 10.0 cm =
a. 20 cm^2 b. 20.00 cm^2 c. 20.0 cm^2 d. 20.000 cm^2

6. How many significant figures in a measured mass of 0.010010 g?
a. 3 b. 1 c. 5 d. 0

7. Which of the following is a chemical property of a slice of chocolate cake?
a. dietary calories b. mass c. color d. temperature e. volume

8. Which of the following is an extensive (extrinsic) property of coffee in a mug?
a. temperature b. color c. percent sugar d. total mg of caffeine

9. Which of the following is an intensive (intrinsic) property?
a. volume b. number of atoms c. mass d. density e. weight

10. Which of the following is a physical property?
a. explosiveness b. corrosiveness c. flammability d. temperature

11. In order to decide whether a property is physical or chemical, you must know whether
a. chemical or physical changes occur when property is measured
b. the property involves matter or energy
c. the property in extrinsic or intrinsic
d. measuring the property changes mass or energy
e. the property in extensive or intensive

12. Solid melts gradually between 85 degrees Celsius and 95 degrees Celsius to give a milky, oily liquid. When a laser beam shines through the liquid, the path of light beam is clearly visible. The milky liquid is likely to be:
a. heterogeneous mixture b. an element c. a compound d. a solution

13. Smoke is an example of a (an):
a. gaseous solution
b. heterogeneous mixture
c. element
d. compound
e. homogeneous mixture

14. The meteorite ALH84001 contains tiny bubbles trapped in the rock. The chemical composition of the gas in these bubbles matches the composition of the Martian atmosphere as determined by the Viking spacecraft in the 1970's. The meteorite is an example of a(an):
a. solution
b. element
c. homogeneous mixture
d. heterogeneous mixture
e. binary compound

15. Antoine Lavoisier, the "Father of Chemistry", listed lime (lime = calcium oxide, not the fruit!)as a chemical element in his table of 33 known elements. Which of the following observations shows that lime cannot be an element?
a. when a certain soft metal is burned in oxygen, lime is produced (with no other products)
b. lime and carbon dioxide are produced when limestone is roasted
c. lime reacts with water, generating a large amount of heat
d. lime melts at a temperature of 2572 degrees Celsius

16. A blue crystalline material is heated strongly in a test tube. A clear liquid condenses around the mouth of the test tube and the crystals gradually lose their blue color and become white powder. Every grain of blue crystal produces 0.36 g of clear liquid and 0.64 g of colorless powder. The same weight relationships are observed for samples of the crystals taken from many different sources. These observations are consistent with the hypothesis that the blue crystals are:
a. a solution
b. a compound
c. a wet salt
d. an element
e. a heterogeneous mixture

17. A measurement that closely agrees with accepted values is said to be
a. accurate
b. precise
c. reliable
d. significant

18. A student measure the mass of one mole of Carbon and finds it to be 12.22 grams. If the accepted value is 12.11 grams, what is the student % error?
a. 0.0091%
b. 0.091%
c. 0.91%
d. 9.1%

19. 3 groups of students measures the mass of a product from the same chemical reaction. The groups recorded the data of 8.83 g, 8.84 g and 8.82 g. The known mass of the product from the reaction is 8.80g. The group values are
a. accurate
b. precise
c. precise and accurate
d. neither precise nor accurate

20. As ice cools from 273 K to 263 K, the average kinetic energy of its molecules will
a. decrease
b. increase
c. remain the same
d. there is no kinetic energy in ice molecules

21. The phase change represented by the vaporization of iodine crystals is called
a. boiling
b. condensation
c. melting
d. sublimation

22. Which substance cannot be decomposed into simpler substances?
a. ammonia
b. aluminum
c. methane
d. ethanol

23. Which statement describes a chemical property?
a. its crystals are metallic gray
b. it dissolves in alcohol
c. it forms violet-colored gas
d. it reacts with hydrogen to form a gas

24. Petroleum is classified chemically as a
a. a substance
b. a compound
c. an element
d. a mixture

25. A student investigated the physical and chemical properties of a sample of unknown gas. Which statement represents a conclusion rather than an experimental observation?
a. the gas is colorless
b. the gas is carbon dioxide
c. when gas bubbled in lime water, the liquid becomes cloudy
d. when placed in the gas, the flaming splint stops burning

26. What is the sum of 6.6412 g + 12.85 g + 0.046 g + 3.48 g expressed to the correct number of significant figures?
a. 23 g
b. 23.0 g
c. 23.02 g
d. 23.017 g

27. What occurs as potassium nitrate is dissolved in a beaker of water, indicating that the process is endothermic?
a. the temperature of the solution decreases
b. the temperature of the solution increases
c. the solution changes color
d. the solution gives off gas

28. In a laboratory exercise to determine the volume of a mole of a gas at STP, a student determines the volume to be 2.25 liters greater than the accepted value of 22.4 liters. The percent error in the student's value is
a. 2.25%
b. 10.0%
c. 20.2%
d. 24.7%

29. To determine the density of an irregularly shaped object, a student immersed the object in 21.2 milliliters of H₂O in a graduated cylinder, causing the level of the H₂O to rise to 27.8 milliliters. If the object had a mass of 22.4 grams, what was the density of the object.
a. 27.8 g/ml
b. 6.6 g/ml
c. 3.4 g/ml
d. 34. g/ml

30. Under the same conditions of temperature and pressure, a liquid differs from a gas because the particles of the liquid
a. are in constant linear motion
b. take the shape of the container they occupy
c. have no regular arrangement
d. have stronger forces of attraction between them


ANSWERS FOR NUMBERS 1-30

a
d
b
e
c
c
a
d
d
d
a
a
b
d
a
b
a
c
c
a
d
b
d
d
b
c
b
b
c
d