Question 1

Do the following calculation,and express the answer using correct scientific notation.
______ = (6.00 *1023)* (3.00)/ (284)

Accepted Answer

A)  6.34 * 1021 
B)  1.58 * 10-22 
C)  6.34 *10-2 
D)  15.8

Question 2

If the first ingredient on the label of a cosmetic is "active ingredient",the cosmetic is also regulated as a drug.

Accepted Answer

A) True 
 B)False

Question 3

The melting of ice to liquid water is correctly classified as

Accepted Answer

A)  a chemical change. 
B)  a physical change. 
C)  both a chemical and a physical change. 
D)  neither a chemical nor physical change.

Question 4

How can the volume of an irregular unknown object be measured?

Accepted Answer

A)  using a ruler to measure length,width,and depth 
B)  measuring the volume of water displaced by the object 
C)  obtaining the mass of the object 
D)  measure the radius and use V=$\pi$r2

Question 5

One system of rating food is to determine its energy density in kcal/g.If your 200 g snack contains 100 g fat (900 cal/g)and a total of 100 g of protein and carbohydrates (400 cal/gram).what is its energy density?

Accepted Answer

A)  1.3 kcal/g 
B)  6.5 kcal/g 
C)  9.0 kcal/g 
D)  13 kcal/g

Question 6

A furnace delivers 8.0 *104 BTU per hour.How many kilocalories per hour is this?
(hint: 1 cal = 0.00397 BTU)

Accepted Answer

A)  3.2 *10-5 kcal 
B)  3.2 *102 kcal 
C)  2.0 * 104 kcal 
D)  2.5 * 102 kcal

Question 7

The metric system is a measurement system that is

Accepted Answer

A)  the official system for all nations of the world. 
B)  only used by a few of the nations of the world. 
C)  commonly used by U.S.physical scientists. 
D)  used exclusively in chemical calculations.

Question 8

The basic unit of length in the metric system is the _____ .

Accepted Answer

A)  mil 
B)  millimeter 
C)  foot 
D)  meter

Question 9

If 6526 is added to 15.0,the answer should have two significant figures.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following numbers is correctly expressed using scientific notation?

Accepted Answer

A)  3489 
B)  5.248 * 104 
C)  45.78 * 106 
D)  .0987 * 103

Question 11

After heating,a pure substance,A,is found to produce both B and C.What can be said about the substance A?

Accepted Answer

A)  It is an element 
B)  It is a compound 
C)  It is either an element or compound 
D)  Impossible to predict

Question 12

The figure shown below is an example of what type of molecule?

Accepted Answer

A)  homoatomic,triatomic 
B)  heteroatomic,polyatomic 
C)  homoatomic,polyatomic 
D)  heteroatomic,triatomic

Question 13

Which of the following terms correctly applies to a molecule of CO2?

Accepted Answer

A)  triatomic,heteroatomic 
B)  polyatomic,diatomic 
C)  triatomic,homoatomic 
D)  diatomic,heteroatomic

Question 14

Do the following calculation and express the answer using the correct number of significant figures.______ = (342)* (0.0012)÷ 100.0

Accepted Answer

A)  0.00410 
B)  0.0041 
C)  4.10 *10-3 
D)  0.004*10S1U1P14S1S1P0

Question 15

Do the following calculation.How many significant figures are justified for the answer? ______= 6.02 + 5.119 + 0.04218

Accepted Answer

A)  three 
B)  four 
C)  five 
D)  seven

Question 16

Eighteen students in a class will get this question correct.If that represents 45% of the class,how large is the class?

Accepted Answer

A)  20 
B)  40 
C)  60 
D)  100

Question 17

The limit of physical subdivision of pure H2O is _____ .

Accepted Answer

A)  the atom 
B)  the molecule 
C)  the element 
D)  a proton

Question 18

If a 50 gram sample of iron alloy contains 40 grams if iron,it contains 80% iron by weight.

Accepted Answer

A) True 
 B)False

Question 19

How many significant figures are justified in a measurement of a length that is between 9 and 10 centimeters if the measuring device (ruler)has smallest divisions of 0.1 cm?

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four

Question 20

Which of the following properties is characteristic of a mixture?

Accepted Answer

A)  constant composition 
B)  variation of physical properties 
C)  fixed melting point. 
D)  cannot be physically separated into simpler materials

Exam 1: Matter, measurements, and Calculations

Do the following calculation,and express the answer using correct scientific notation. ______ = (6.00 10²³) (3.00) / (284)

If the first ingredient on the label of a cosmetic is "active ingredient",the cosmetic is also regulated as a drug.

The melting of ice to liquid water is correctly classified as

How can the volume of an irregular unknown object be measured?

One system of rating food is to determine its energy density in kcal/g.If your 200 g snack contains 100 g fat (900 cal/g) and a total of 100 g of protein and carbohydrates (400 cal/gram) .what is its energy density?

A furnace delivers 8.0 *10⁴ BTU per hour.How many kilocalories per hour is this? (hint: 1 cal = 0.00397 BTU)

The metric system is a measurement system that is

The basic unit of length in the metric system is the _____ .

If 6526 is added to 15.0,the answer should have two significant figures.

Which of the following numbers is correctly expressed using scientific notation?

After heating,a pure substance,A,is found to produce both B and C.What can be said about the substance A?

The figure shown below is an example of what type of molecule?

Which of the following terms correctly applies to a molecule of CO₂?

Do the following calculation and express the answer using the correct number of significant figures.______ = (342) * (0.0012) ÷ 100.0

Do the following calculation.How many significant figures are justified for the answer? ______= 6.02 + 5.119 + 0.04218

Eighteen students in a class will get this question correct.If that represents 45% of the class,how large is the class?

The limit of physical subdivision of pure H₂O is _____ .

If a 50 gram sample of iron alloy contains 40 grams if iron,it contains 80% iron by weight.

How many significant figures are justified in a measurement of a length that is between 9 and 10 centimeters if the measuring device (ruler) has smallest divisions of 0.1 cm?

Which of the following properties is characteristic of a mixture?

Exam 1: Matter, measurements, and Calculations

Do the following calculation,and express the answer using correct scientific notation. ______ = (6.00 *1023) * (3.00) / (284)

If the first ingredient on the label of a cosmetic is "active ingredient",the cosmetic is also regulated as a drug.

The melting of ice to liquid water is correctly classified as

How can the volume of an irregular unknown object be measured?

One system of rating food is to determine its energy density in kcal/g.If your 200 g snack contains 100 g fat (900 cal/g) and a total of 100 g of protein and carbohydrates (400 cal/gram) .what is its energy density?

A furnace delivers 8.0 *104 BTU per hour.How many kilocalories per hour is this? (hint: 1 cal = 0.00397 BTU)

The metric system is a measurement system that is

The basic unit of length in the metric system is the _____ .

If 6526 is added to 15.0,the answer should have two significant figures.

Which of the following numbers is correctly expressed using scientific notation?

After heating,a pure substance,A,is found to produce both B and C.What can be said about the substance A?

The figure shown below is an example of what type of molecule?

Which of the following terms correctly applies to a molecule of CO2?

Do the following calculation and express the answer using the correct number of significant figures.______ = (342) * (0.0012) ÷ 100.0

Do the following calculation.How many significant figures are justified for the answer? ______= 6.02 + 5.119 + 0.04218

Eighteen students in a class will get this question correct.If that represents 45% of the class,how large is the class?

The limit of physical subdivision of pure H2O is _____ .

If a 50 gram sample of iron alloy contains 40 grams if iron,it contains 80% iron by weight.

How many significant figures are justified in a measurement of a length that is between 9 and 10 centimeters if the measuring device (ruler) has smallest divisions of 0.1 cm?

Which of the following properties is characteristic of a mixture?

Do the following calculation,and express the answer using correct scientific notation. ______ = (6.00 10²³) (3.00) / (284)

A furnace delivers 8.0 *10⁴ BTU per hour.How many kilocalories per hour is this? (hint: 1 cal = 0.00397 BTU)

Which of the following terms correctly applies to a molecule of CO₂?

The limit of physical subdivision of pure H₂O is _____ .