Matter and Measurement

Question 1

The specific heat of water is 4.184 J/gC.
What amount of heat is needed to chance the temperature of 0.0134g of water from 29.1 C to 44.3 C ? (in joules).

Answer 1

Heat = m x change in temp. x SH

858 J (3 sig. figs.).

Question 2

Name the following transitions between states…

Solid -> liquid
Liquid -> gas
Solid -> gas
Liquid -> solid
Gas -> liquid
Gas -> solid

Answer 2

Deposition.

Melting.

Evaporation.

Sublimation.

Freezing.

Condensation.

Question 3

How would you represent the correct # of significant figures for the following equation?
0.00205 x 3.3300

Answer 3

= 0.00683

(3 sig. figs. - rounded properly)

Question 4

If the density of gold is 1.93 g/L and you have a 1.92g sample, what is the volume of the sample?

Answer 4

D = m/v

v = 0.995 L

Question 5

What is the numerical value of (2.1 x 10 ^4) x 4.0 x 10 ^-2) expressed to the correct significant figure?

Answer 5

8.4 x 10 ^2

Question 6

Which measurement is the smallest quantity?

A) 29.5 mg
B) 2.95 x 10^3 mcg
C) 2.95 x 10^-6 g
D) 2.95 x 10^-6 kg
E 2950 ng

Answer 6

E) 2950 ng

Question 7

True or False:
If a chemical change occurs, it must be able to be represented by a chemical reaction.

Answer 7

True.

Question 8

True or False:
Mass and weight can be used interchangeably.

Answer 8

False.

They are 2 different types of measurement.

Question 9

Is the following a physical or chemical property?

Steel is a silver-grey.

Answer 9

Physical property.

It is an observation of the color without modifying it.

Question 10

Is the following a physical or chemical property?

Hydrogen reacts readily with oxygen.

Answer 10

Chemical property.

This can only be determined by altering the substance.

Question 11

Is the following a physical or chemical property?

A patient has a temperature of 40.2 C.

Answer 11

Physical property.

Question 12

Is the following a physical or chemical property?

Butane gas in an igniter burns in oxygen.

Answer 12

Chemical property.

Question 13

Is the following a physical or chemical change?

Water vapor condenses to form rain.

Answer 13

Physical change.

This is a change of state, there is no chemical alteration.

Question 14

Classify the following as heterogenous or homogeneous mixtures:

1. Vegetable soup.
2. Salt water.
3. Raspberry tea.
4. Tea with ice and lemon slices.
5. Fruit salad.

Answer 14

1. Vegetable soup = heterogenous
2. Salt water = homogeneous
3. Raspberry tea = homogeneous
4. Tea with ice and lemon slices = heterogenous
5. Fruit salad = heterogenous

Question 15

Name each as an element or a compound:

1. A silicon (Si) chip.
2. Hydrogen peroxide (H2O2).
3. Oxygen (O2).
4. Rust (Fe2O3).

Answer 15

1. Element.
2. Compound
3. Element.
4. Compound

Question 16

Is NaHCO3 (baking soda) a pure substance or a mixture?

Answer 16

Pure substance.

Has an even distribution throughout.

Question 17

Identify if it is a liquid, solid, or gas:

The air in a scuba tank has no definite shape or volume.

Answer 17

Gas.

It has no definite shape or volume.

Question 18

Describe the following property of fluorine (F2) as a physical or chemical property.

It is highly reactive.

Answer 18

Chemical.

Question 19

Is this a physical or chemical change?

Cesium metal reacts explosively with metal.

Answer 19

Chemical property.

Question 20

What is the definition of density?

Answer 20

Mass per unit volume.

Question 21

Is a blueberry muffin a pure substance or a mixture?

Answer 21

Mixture.

A blend of 2 or more substances of which retain their chemical identity.

Question 22

How would you define volume and shape of a gas?

Answer 22

It has no definite shape or volume.

The volume and shape of a gas is defined by its container.

Question 23

How are the elements in a pure substance distributed?

Answer 23

Distributed evenly of the elements its comprised.