unit 1

Question 1

what is the SI unit for Temperature

Answer 1

Kelvin

Addition : Least Decimal Place. ( Tempt need to be in Celcius)

Question 2

3 Chemical Property

Answer 2

1. Flammability
2. Redox ( ability to rust)
3. Reactivity/ toxicity

Question 3

Endothermic Process?

Answer 3

1. Energy of the reactant - lower than prod.
2. absorb energy from its surrounding
   eg. Melting ice

Question 4

3 example of Exothermic Process

Answer 4

1. Condensation of Steam
2. Freezing water
3. Combustion of gasoline

Exothermic process : releases heat into the surrounding.

note : Surrounding absorbs the energy that is release by reaction.

Question 5

metric conversion
(name 10)

Answer 5

1. kilo =10^3 = 1,000 meters
2. hecta =10^2
3. deca = 10^1
4. base = 0 meters = 1,000 milimeters
5. deci = 10^ -1 = 0.1
6. centi =10^-2 = 0.01
7. mili = 10^-3 = 0.03
8. micro = 10^-6
9. nano =10^-9
10. pico = 10^-12

Scientific notation : 1, 2, 3 SKIP by 3

Question 6

Scientific Notation
50.0 significant
500 ambigous

Answer 6

Decimal place is important when writing scientific notation :
eg . 50.0 = 5.00 x 10^1 b/c initial had 3 sigfigs
eg. 500 = 5 x 10 ^ 3 b/c its ambigious : trailing zero.

Question 7

what is accuracy
what is precision

Answer 7

1. precision is the cloness of set value obtain from identical measurement of a quantity.
2. accuracy closeness of a single measur. to its true value

significant figures

Question 8

2 Relationship of Precision and Accuracy

Answer 8

1. High %Error = Low Accuracy
2. High Deviation = Low Precision

deviation : is how far away from true value.

Question 9

Significant Figures

45.872
What value is certain ,what value is uncertain.

Answer 9

1. the last value 2 is uncertain
2. the rest are certain 45.8

Question 10

Significant Figures

Unlimited Significant figure

Answer 10

1. Exact Number
   counting number, fixed by definition, (1 dozen = 12) conversion factors.
2. measurement
   fixed quanties like 3.14, tempt 1.8, 273

Question 11

chapter 2

What is Mass ?
What is Weight?
what are the SI Unit

Answer 11

1. Mass SI unit Kilogram
   mass - measure of quantity of matter.
   2.Weight Si unit Newton
   measure of force of gravitational pull.

Question 12

Chapter 2

True or False
incrs. mass = incrs. weight
decrs. in mass = decrs. in weight.

Answer 12

True :
Mass and Weight are directly proportional to each other

Question 12

chapter 2

True of False
Weight depends on gravity
and mass does not.

Answer 12

True

Question 12

what is the formula for Volume
what is the SI unit?

Answer 12

**Formula **V= L x W X h
answer must be in cm3 (cubic centimeter)
SI Unit for Vol1mL(liquid) = cm3 (solid)

Question 13

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Formula for Density

Answer 13

density = mass / volume

density = grams / mL or gram/ cm3

Question 14

1.

Conversion formula

Answer 14

given unit = desired/ (given) = desired unit
note : the bigger unit always followed by 1Kilo=1meter or 1 meter = 1,000milimeter

Question 15

chapter 1

name 3 characteristic that is necessary for us to understand chemistry

Answer 15

1.curiosity
2.calcualtion
3.commitment

Question 16

chapter 1

what is a law

Answer 16

a short statement that summarizes a large number of observation.

Question 17

chapter 1

what is a hypothesis

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Answer 17

1. a tentative interpretation or explanation of the observation : “if statement”
2. it can be falsifiable : a scientific problem, that can be tested, for further investigation.

Question 18

Observation

Answer 18

quantitative :measure or describe something about the natural word.
eg : when a metal is burned in a close container, the sum of the masses of container and its content does not chage.
eg: Matter is conserved in chemical reaction.
eg : the Earth is moving away from earth in high speed.
eg.: a stone dropped from an altitude of 450 m and falls to the ground at 96 second

Question 19

what is Crystallin Solid
what is Amorphous Solid

Answer 19

Crystallain Solid : atoms are arrange in neat repeating patterns. *properies are consitent. eg NaCl
Amorphous Solid w/out shape no pattern or arrangement. * properties behave more like liquid

Question 20

Example of Amorphis Solid

Answer 20

1. Glass
2. Plastic
3. Rubber