Chapter 3 Matter and Energy

Question 1

what contains a fixed chemical composition?

Answer 1

pure substance such as any one of the 118 elements or compounds of 2 or more elements

Question 2

what contains a variable chemical composition?

Answer 2

heterogenous mixtures (such as 2 or 3 pure substances or oil and water)
or homogenous mixtures (such as sugar and water)

Question 3

In order to separate mixtures, what processes would you need to perform?

Answer 3

evaporation, distillation, chromatography or filtration

Question 4

memorize

Question 5

what is the difference between a chemical change and a physical change?

Answer 5

chemical: changes the chemical composition (such as changing solid form of sodium and chlorine into table salt)
Physical: changes the physical composition without changing the overall chemical state (such as changing H2O from a solid to liquid)

Question 6

what is the freezing point of Celsius, Keltic, and Fahrenheit?

Answer 6

C = 0
K = 273
F = 32

Question 7

what is the boiling point of Celsius, Keltic, and Fahrenheit?

Answer 7

C = 100
K = 373
F = 212

Question 8

what is the formula for converting C to F?

Answer 8

Question 9

Given -22C convert to Fahrenheit

Answer 9

Question 10

what is the formula for Keltic to Celsius?

Answer 10

Question 11

Given 35 Celsius convert to Keltic

Answer 11

Question 12

Given 828 Keltic, convert to Celsius

Answer 12

Question 13

How many cal in 1 kcal?

Answer 13

1000 cal = 1 kcal

Question 14

how many joules in 1 kJ?

Answer 14

1000 = 1 kJ

Question 15

Given: 605 cal, convert to joules?
1 cal = 4.184 J

Answer 15

Question 16

how many cal in 1 Cal?

Answer 16

1000 cal = 1 Cal

Question 17

Given: 350. Cal, convert to Joules
1 cal = 4.184 Joules

Answer 17

Question 18

what is the formula for Calorimeter?

Answer 18

Question 19

Answer 19

Question 20

what is fusion?

Answer 20

when something goes from solid to liquid

Question 21

what is vaporization?

Answer 21

when something goes from liquid to gas

Question 22

what is condensation?

Answer 22

when something goes from gas to liquid

Question 23

what is freezing?

Answer 23

when something goes from liquid to solid

Question 24

what is sublimation?

Answer 24

when something goes from solid immediately to gas (such as dry ice)

Question 25

what is deposition?

Answer 25

when something goes from gas immediately to solid (such as steam to ice)

Question 26

memorize

Question 27

Given 205 g of water (ice), calculate the heat of melting? Use one correct conversion below

Answer 27

Question 28

Given: 24,000 cal, calculate the mass (g) of water needed for freezing. Use one correct conversion below

Answer 28

Question 29

how many kcal/g and kJ/g are found in Carbohydrates?

Answer 29

4 kcal/g
17 kJ/g

Question 30

how many kcal/g and kJ/g are found in Fat?

Answer 30

9 kcal/g
38 kJ/g

Question 31

how many kcal/g and kJ/g are found in Protein?

Answer 31

4 kcal/g
17 kJ/g

Question 32

Given: 26g carbohydrates; 1 g protein,
how many kcal?

Answer 32

Question 33

Given: 85.0 miles/hr
how many km/s?
1 km = 0.621 miles

Answer 33

Question 34

Convert 215 seconds to nanoseconds?

Answer 34