Quiz 2

Question 1

What is a conversion factor?

Answer 1

A ratio of equivalent quantities used to express a quantity in different units.

Question 2

What is density?

Answer 2

Mass/Volume (a physical property and has a specific value)

Question 3

What is the density of water? (H2O)

Answer 3

Approximately 1 g/cm^3

Question 4

How to find K when you have C?

Answer 4

C + 273.15 = K

Question 5

How to find C when you have K?

Answer 5

K - 273.15 = C

Question 6

How to find F when you have C?

Answer 6

(9/5)(C) + 32 = F

Question 7

How to find C when you have F?

Answer 7

(5/9)(F - 32) = C

Question 8

Sig Figs

Answer 8

The greater number of significant figures in a quantity, the greater its certainty.

Question 9

What sig figs are important?

Answer 9

All sig figs are important EXCEPT zeros that are used only to position the decimal point.
i.e.) 0.000356 –> only three sig figs

Question 10

How many sig figs are in 1.030?

Answer 10

Four

Question 11

How many sig figs are in 5300?

Answer 11

Two

Question 12

What are the sig fig rules for multiplication and division?

Answer 12

Same as the sig figs in the measurements –> least amount of sig figs

Question 13

What are the sig fig rules for addition and subtraction?

Answer 13

Count the number of least sig figs from the decimal point. (DON’T WORRY ABOUT THE LEFT SIDE OF THE DECIMAL)

Question 14

What are rounding rules for sig figs if the number is 5 and is not greater or less than the preceding number?

Answer 14

If the preceding number before the five is odd, round the preceding number up.
If the preceding number before the five is even, keep the preceding number the same.

Question 15

What is precision?

Answer 15

Precision refers to how close the measurements in a series are to each other.

Question 16

What is accuracy?

Answer 16

Accuracy refers to how close each measurement is to the actual value.

Question 17

What is systematic error?

Answer 17

Systematic error produces values that are either all higher or all lower than the actual value.

Question 18

What is random error (noise)?

Answer 18

Random error produces values that are both higher and lower than the actual value.

Question 19

What is an element?

Answer 19

The simplest type of substance with unique physical and chemical properties. An element consists of only one type of atom It cannot be broken down into any simpler substances by physical or chemical means.

Question 20

What is a molecule?

Answer 20

A structure that consists of two or more atoms that are chemically bound together and thus behaves as an independent unit.

Question 21

What is a compound?

Answer 21

A substance composed of two or more different elements which are chemically combined.

Question 22

What is a mixture?

Answer 22

A group of two or more elements and/or compounds that are physically intermingled.

Question 23

What is a heterogenous (different) mixture?

Answer 23

It has one or more visible boundaries between the components.

Question 24

What is a homogenous (same) mixture?

Answer 24

It has no visible boundaries because the components are mixed as individual atoms, ions, and molecules. Also called a solution.

Question 25

What is a pure substance?

Answer 25

Matter that cannot be separated by a physical process. Such as compounds and elements.

Question 26

What is the Law of Definite Composition?

Answer 26

It is that a particular compound is composed of the same elements in the same parts (fractions) by mass.

Question 27

What is Dalton's Atomic Theory?

Answer 27

All matter consists of atoms, atoms of one element cannot be converted into atoms of another element, atoms of an element are identical in mass and other properties and are different from the atoms of any other element, and compounds result from the chemical combination of a specific ratio of atoms of different elements.

Question 28

What is the Law of Conversation of Mass?

Answer 28

Matter can not be created or destroyed.