Ch 3

Question 1

T/F in a solid substance, the atoms or molecules oscillate and vibrate abut a fixed point

Answer 1

T

Question 2

An energy diagram that shows the reactions having greater energy than they products illustrates an:
A. Impossible reaction
B. Exothermic reaction 
C. Endothermic reaction 
D. Isothermic reaction
E. none of the above

Answer 2

B. Exothermic reaction

Question 3

T/F even the most recent advances in microscopy, it is impossible to image an atom

Answer 3

F

Question 4

T/F in a chemical reaction, the substances present after the chemical change are called reactants

Answer 4

F

Question 5

An example of a chemical change is burning a wood log to give a pile of ashes

Answer 5

T

Question 6

T/F matter is defined as anything hat is visible to the human eye

Answer 6

F

Question 7

Which of the following is a heterogeneous mixture
A. Air 
B. Milk
C. Raisin bran
D. Sugar water
E. none of the above

Answer 7

C. Raisin bran

Question 8

If a solid piece if shiny sodium metal is exposed to chlorine gas, a large amount of heat is released and the white solid sodium chlorine (table salt) forms. Based on this information, which of the following statements is TRUE
A. This process represent a physical change
B. This process was exothermic
C. Sodium chloride is an element
D. Mass is lost during this process
E. none f the above

Answer 8

B. This process was exothermic

Question 9

What is the specific heat (J/g x C) if a metal object whose temp increase by 3.0C when 17.5 g of metal was heated with 38.5 J
A. 0.15
B. 1.4
C. 0.73
D. 4.18
E. none of the above

Answer 9

C. 0.73

Question 10

What type of energy is associated with the burning of gasoline 
A. kinetic 
B. Electrical 
C. Chemical 
D. Potential 
E. none of the above

Answer 10

C. Chemical

Question 11

T/F Gases are the only form f matter that is easily compressible

Answer 11

T

Question 12

How would you classify salt water 
A. Pure substance-compound 
B. Mixture-heterogeneous 
C. Pure substance-element
D. Mixture-homogeneous 
E. none of the above

Answer 12

D. Mixture-homogeneous

Question 13

Which of the following item is a pure substance
A. Brass
B. Seawater
C. Air
D. Ice 
E. none of the above

Answer 13

D. Ice

Question 14

How many joules are there in a 255 calorie snack bar 
A. 1.07 x 10^3
B. 2.55 x 10^5
C. 6.09 x 10^4 
D. 1.07 x 10^6
E. none of the above

Answer 14

A. 1.07 x 10^3

Question 15

Which of the following is NOT a common unit of energy 
A. Joule
B. Calorie
C. Torr
D. Kilowatt-hour
E. none of the above

Answer 15

C. Torr

Question 16

When methane is burned with oxygen the product are carbon dioxide and water.  If you produce 36 grams of water and 44 grams of carbon dioxide from 16 grams of methane, how many grams of oxygen were needed for the reaction 
A. 96
B. 32
C. 80
D. 64
E.none of the above

Answer 16

D. 64

Question 17

Which of the following is NOT an example of matter
A. A dust particle 
B. A pencil eraser
C. A balloon full of helium 
D. Heat from a burning candle
E. none of the above

Answer 17

D. Heat from a burning candle

Question 18

Consider the following specific heat of metals
Metal. Specific heat
Aluminum. 0.903
Copper 0.385
Gold 0.128
Iron. 0.449
Silver 0.235
If the same mount of heat was added to 50.0 g samples of each of the metals, which are all the same temp, which metal will reach the highes temp

Answer 18

Gold

Question 19

T/F liquids have definite volume and indefinite shape

Answer 19

T

Question 20

Which type of energy is associated with position 
A. Electrical 
B. Kinetic
C. Potential 
D. Chemical 
E. none of the above

Answer 20

C. Potential

Question 21

When methane is burned with oxygen, the products are carbon dioxide and water.  If you produce 9 grams of water and 11 grams of carbon dioxide from 16 grams of oxygen, how many grams of methane were needed for the reaction 
A. 4
B. 40 
C. 20 
D. 31
E. none of the above

Answer 21

A. 4

Question 22

T/F solids have indefinite shape and volume

Answer 22

F

Question 23

Which of the following is a chemical property
A. The paint color on a new red corvette
B. The melting and boiling point of water
C. The tarnishing of a copper statue
D. The odor of spearmint gum
E. none of the above

Answer 23

C. The tarnishing of a copper statue

Question 24

Which type of energy is associated with motion 
A. Potential 
B. Electrical
C. Chemical 
D. Kinetic 
E. none of the above

Answer 24

D. Kinetic

Question 25

``` When 49.5 J of heat was transferred to 7.3 g iron at 22 C, the temp of iron increases to 37 C. What is the specific heat of iron in J/g x C A. 2.2 B. 24 C. 4.5 D. 0.45 E. none of the above ```

Answer 25

D. 0.45

Question 26

A pre substance is A. Compose of only one type of atom or molecule B. Composed of 2 or more different types of atoms or molecules that has constant composition C. Composed f 2 or more regions with different composition D. Composed of 2 or more different types of atoms or molecules combined in variable proportions E. none of the above

Answer 26

A. Composed of only one type of atom or molecule

Question 27

T/F the melting of ice is a physical change

Answer 27

T

Question 28

``` In order, what is the freezing point, room temp and boiling point of water according to the Celsius scale A. 0-75-100 B. 0-298-373 C. 32-75-212 D. 0-25-100 E. none of the above ```

Answer 28

D. 0-25-100

Question 29

``` How many kilojoules are there in 95.0 Calories A. 397 B. 22.7 C. 2.27 x 10^7 D. 3.97 x 10^-4 E. none of the above ```

Answer 29

A. 397

Question 30

``` A solid form of matter in which there is long range repeating order is called _______ A. Fixed B. Rigid C. Amorphous D. Crystalline E. none of the above ```

Answer 30

D. Crystalline

Question 31

``` In order , what is the freezing point, room temp and boiling point of water according to the Fahrenheit scale A. 32-75-212 B. 0-298-373 C. 0-75-100 D. 0-25-100 E. none of the above ```

Answer 31

A. 32-75-212.

Question 32

``` What is the value of the 27C on the kelvin temp scale A. 273 B. 81 C. 300 D. 246 E. none of the above ```

Answer 32

C. 300