Ch's 1, 2 & 3

Question 1

64,000

.021

Answer 1

6. 4 x 10^4

2. 1 x x 10^-2

Question 2

Density =

Answer 2

mass/volume (typically g/cm^3 or g/mL

Question 3

specific gravity =

Answer 3

density of sample / density of water (UNITLESS!!!!)

Question 4

Tf =

Answer 4

Tf = 1.8 (Tc) + 32

Question 5

K =

Answer 5

Tc + 273

Question 6

1 K =

Answer 6

1 C

Question 7

Boiling point of water in F, C, and K

Answer 7

212F, 100C, 373K

Question 8

Normal body temp in F, C, and K

Answer 8

98.6F, 37C, 310K

Question 9

Freezing point of water in F, C, and K

Answer 9

32F, 0C, 273K

Question 10

energy of motion (examples)

Answer 10

kinetic energy

swimming, water flowing over dam, working out

Question 11

_____ is energy stored for use at a later time. It
is determined by the position of an object or the
chemical composition of a substance. Examples?

Answer 11

Potential energy

are the following:
• water at the top of a dam
• a compressed spring
• chemical bonds in gasoline, coal, or food

Question 12

____ is the energy associated with the movement of particles.

The ___ the particles move, the greater the heat or thermal energy of the substance.

Given an ice cube, as heat is added, the H2O molecules
• that are moving slowly increase their motion.
• eventually have enough energy to change the ice cube from a solid to a liquid.

Answer 12

Heat

faster

Question 13

The ____ is defined as the amount of energy needed to raise the temperature of 1 g of water by 1 °C.

Answer 13

calorie

Question 14

Nutritionists burn food in a ____ that

• is used to measure heat transfer.
• consists of a steel container filled with oxygen and a measured amount of water.
• indicates the heat gained by water, which is the heat lost by a sample during combustion.

In a calorimeter, the burning of a food sample increases the temperature of the water, which is used to calculate the energy value of the food.

Answer 14

calorimeter

Question 15

_____ from burning a food sample in a calorimeter is used to determine the energy value for the food.

Answer 15

Heat released

Question 16

1 Cal =

Answer 16

1000 calories

Question 17

A measure of toxicity which is the concentration of the substance that causes death in 50% of the test animals

Answer 17

LD50

Question 18

dosage is typically measure in:

Answer 18

mg/kg
mcg/kg

LD50 of caffeine is 192mg/kg (slow down Calvin)

Question 19

density =

Answer 19

mass of a substance / volume of a substance

Question 20

specific gravity =

Answer 20

density of sample / density of water

Question 21

specific gravity

Answer 21

relationship of a substance and the density of water

is calculated by dividing the density of a sample by the density of water, which is 1.00 g/ mL at 4 deg C

UNITLESS!

Question 22

Normal range of temperatures for human:

Answer 22

100.4 to 96.8 (average of 98.6)

Question 23

hypothermia in human

Answer 23

95

Question 24

hyperthermia in human

Answer 24

105.8 (death possibly impending)

Question 25

On Celsius scale there are ___ degrees between boiling and freezing points

Answer 25

100

Question 26

On Fahreneit scale there are ____ degrees between boiling and freezing points

Answer 26

180

Question 27

Scientists have learned that the coldest temperature possible is:

Answer 27

-273 deg C | 0K

Question 28

absolute zero

Answer 28

0 K (-273 deg C)

Question 29

freezing point of water

Answer 29

32 deg F 0 deg C 273 deg K

Question 30

normal body temp

Answer 30

98.6 deg F 37 deg C 310 K

Question 31

boiling point of water

Answer 31

212 deg F 100 deg C 373 K

Question 32

the number obtained by counting

Answer 32

exact number

Question 33

a part of the name of a metric unit that precedes the base unit and specifies the size of the measurement

Answer 33

prefix

Question 34

a ratio in which the numerator and denominator are quantities from an equality

Answer 34

conversion factor

Question 35

the relationship between two units that measure the same quantity

Answer 35

equality

Question 36

the digits recorded in a measurement

Answer 36

significant figures (degree of accuracy)

Question 37

the number obtained when a quantity is determined by using a measure device

Answer 37

measured number

Question 38

the relationship of the mass of an object specified to its volume expressed as grams per cubic centimeter or grams per milliliter

Answer 38

density

Question 39

the relationship between the density of a substance and the density of water

Answer 39

specific gravity

Question 40

the ability to do work

Answer 40

energy

Question 41

the SI unit of energy

Answer 41

Joule

Question 42

the energy of motion

Answer 42

kinetic energy

Question 43

the amount of heat that raises the temp of exactly 1 gram of water exactly 1 deg Celsius

Answer 43

calorie

Question 44

a change in physical properties of a substance with no change in its identity

Answer 44

physical change

Question 45

a type of energy that is stored for future use

Answer 45

potential energy

Question 46

1000 cal

Answer 46

kilocalorie

Question 47

raise 1 gram of water by 1 deg celsius

Answer 47

calorie

Question 48

the nutritional calorie

Answer 48

Cal

Question 49

Cal =

Answer 49

1 kcal, or 1000 calories

Question 50

the energy content of a food is the sum of kilocalories or kilojoules from....

Answer 50

carbs, fat, protein

Question 51

when a substance is burned in a calorimeter, the water that surrounds the reaction chamber absorbs the heat given off. What is calculated?

Answer 51

The heat absorbed by the water is calculated, and the energy content for the substance (energy per gram) is determined