Chemistry

Question 1

Convert Kelvin to Celsius

Answer 1

-273

Question 2

Convert Celsius to Kelvin

Answer 2

+273

Question 3

Convert Fahrenheit to Celsius

Answer 3

-32/1.8

Question 4

Convert Celsius to Fahrenheit

Answer 4

X 1.8 + 32

Question 5

Convert Kelvin to Fahrenheit

Answer 5

-273 X 1.8 +32

Question 6

Convert Fahrenheit to Kelvin

Answer 6

-32/1.8 + 273

Question 7

1 foot in inches

Answer 7

12in

Question 8

1 pound in ounces

Answer 8

16 ounces

Question 9

1 kilogram into grams

Answer 9

1000

Question 10

1 gallon in quarts

Answer 10

4 quarts

Question 11

1000 milliliters in a liter

Answer 11

1 liter

Question 12

100 centigrams in a gram

Answer 12

1 gram

Question 13

10 decimeters in a meter

Answer 13

1 meter

Question 14

What are the 4 prefixes presented in the course?

Answer 14

Kilo 1000

Milli 1/1000

Centi 1/100

Deci 1/10

Question 15

What is density?

Answer 15

Mass of a substance in a unit volume of that substance

Question 16

What is density expressed as?

Answer 16

g/ml

Question 17

What is the equation used to calculate density?

Answer 17

D (g/ml) = Mass (grams)/V (milliliters)

Question 18

How do you calculate for Mass if you know the Density and Volume?

Answer 18

M(g) = D (g/ml) x V(ml)

Question 19

How to calculate for the volume if you know the mass and density?

Answer 19

V(ml) = M (g)/D(g/ml)

Question 20

What is accuracy?

Answer 20

It is the nearest of the measured value to the actual value of the quantity being measured

Question 21

What is Precision?

Answer 21

The degree of agreement between several measured values of quantity

Question 22

What are the rules for determining the significant figures in a Number?

Answer 22

1. All n on-zero digits are significant
2. All zeros between or following non-zero numbers are significant
3. Zeros to the left of a decimal or preceding other non-zero numbers are not significant

Question 23

Significant figures in addition/subtraction

Answer 23

Round off so that the same number if decimal places as the measurement with the fewest decimal places

ex. 8.612 + 4.51 + 0.20 + 3.9 = 17.222 = 17.2 because of 3.9

Question 24

Rules of significant figures in multiplication/division

Answer 24

Results should be rounded off as to contain the same number of significant figures with the least number of significant figures

128.61/51.20 (4 significant figures)= 2.51191 rounding —>2.512

Question 25

Order of operation

Answer 25

Parentheses Exponents Multiplication/division Addition/Subtraction

Question 26

Al

Answer 26

Aluminum

Question 27

Sb

Answer 27

Antimony

Question 28

Ar

Answer 28

Argon

Question 29

As

Answer 29

Arsenic

Question 30

Ba

Answer 30

Barium

Question 31

Be

Answer 31

Beryllium

Question 32

Bi

Answer 32

Bismuth

Question 33

B

Answer 33

Boron

Question 34

Br

Answer 34

Bromine

Question 35

Cd

Answer 35

Cadmium

Question 36

Ca

Answer 36

Calcium

Question 37

C

Answer 37

Carbon

Question 38

Cl

Answer 38

Chlorine

Question 39

Cr

Answer 39

Chromium

Question 40

Co

Answer 40

Cobalt

Question 41

Cu

Answer 41

Copper

Question 42

F

Answer 42

Flurine

Question 43

Au

Answer 43

Gold

Question 44

He

Answer 44

Helium

Question 45

H

Answer 45

Hydrogen

Question 46

I

Answer 46

Iodine

Question 47

Fe

Answer 47

Iron

Question 48

Pb

Answer 48

Lead

Question 49

Li

Answer 49

Lithium

Question 50

Mg

Answer 50

Magnesium

Question 51

Mn

Answer 51

Manganese

Question 52

Hg

Answer 52

Mercury

Question 53

Ne

Answer 53

Neon

Question 54

Ni

Answer 54

Nickel

Question 55

N

Answer 55

Nitrogen

Question 56

O

Answer 56

Oxygen

Question 57

P

Answer 57

Phosphorus

Question 58

Pt

Answer 58

Platinum

Question 59

K

Answer 59

Potassium

Question 60

Se

Answer 60

Selenium

Question 61

Si

Answer 61

Silicon

Question 62

Ag

Answer 62

Silver

Question 63

Na

Answer 63

Sodium

Question 64

Sr

Answer 64

Strontium

Question 65

S

Answer 65

Sulfur

Question 66

Sn

Answer 66

Tin

Question 67

Compound

Answer 67

Combination of two elements

Question 68

Homogeneous Mixture (Solution)

Answer 68

Combination of two elements but seen as one layer

Question 69

Heterogeneous Mixture

Answer 69

A combination of two compounds that appear as multiple layers

Question 70

Physical Change of a chemical

Answer 70

Does not change chemical composition Ex. Gasm solid, liquid and gas

Question 71

Chemical Change if a chemical

Answer 71

Changes composition of matter (Chemical Reaction) Often visible as heat or light, color change, production of an insoluble solid, and gas Ex. Burning (combustion), Rusting (oxidizing), Explosion or baking

Question 72

What is the third type of chemical change

Answer 72

Temperature change

Question 73

Calorimetry

Answer 73

The study of how much heat is involved in a temperature or physical change

Question 74

Thermochemistry

Answer 74

The study of how much heat in involved in chemical change

Question 75

Exothermic

Answer 75

Heat os given off (extracted)

Question 76

Nucleus

Answer 76

Mass in the center of atom, contains two types of particle: Protons and neutrons

Question 77

Protons

Answer 77

Have a positive charge (+)

Question 78

Neutrons

Answer 78

Have no charge

Question 79

What are the low mass particles that surround the nucleus of an atom? What is their charge?

Answer 79

Electrons, negative

Question 80

Atomic number

Answer 80

Whole number, represents # of protons and also the # of electrons.

Question 81

Atomic Charge

Answer 81

of protons - # of electrons which always = 0

Question 82

Atomic weight

Answer 82

The larger number, usually as a decimal. It is = to the sum of the number of protons and neutrons