Chapter 1 - Chemistry And Measurements

Question 0

Branches of chemistry

Answer 0

General chemistry
Organic chemistry
Biological chemistry

Question 1

Chemistry

Answer 1

Study of composition, structure, properties, and ex of matter

Question 2

Matter

Answer 2

All substances that make up our world

Question 3

General chemistry

Answer 3

Study of composition, properties, and reaction of matter

Question 4

Organic chemistry

Answer 4

Study of substances that contain the element carbon

Question 5

Biological chemistry

Answer 5

Study of the chemical reactions that takes place in biological systems

Question 6

Who were the early chemists?

Answer 6

Alchemists

Question 7

What did early chemists study, and do?

Answer 7

Extracted metals from ore
designed some of the first lab equipments
Developed early lab procedure

Question 8

Chemical

Answer 8

Substance that has the same composition and properties wherever it is found. Aka substance

Question 9

What are the units of measurements?

Answer 9

Length, volume, mass, temperature, and time

Question 10

Length:
SI unit?
Metric unit?
Smaller unit?

Answer 10

Meter (m)
Meter (m)
Centimeter (cm)

Question 11

Define volume
Metric unit?
SI unit?

Answer 11

Amount of space a substance occupies
Metric: liter (L)
SI: cubic meter (cm^3)

Question 12

1m :__cm
1m: __in
1m:__yd
___cm:1in

Answer 12

1m. 100cm
1m. 39.4in
1m. 1.09yd
2. 54cm. 1 in

Question 13

1L :–mL
1L:–qt
–mL:1qt
1000L:–m^3

Answer 13

1L. 1000mL
1L. 1.06 qt
946 mL. 1 qt
1000L. 1 m^3

Question 14

Mass definition
SI unit
Metric unit

Answer 14

Measure if the quantity of material it contains
SI unit. Kilogram (kg)
Metric unit. Gram (g)

Question 15

1kg: –g
1kg: – lb
- -g:1lb

Answer 15

1kg:1000 g
1kg:2.20 lb
454 g:1lb

Question 16

What is the difference between weight and Mass? (Define weight)

Answer 16

Weight is the measure of the gravitational pull of an object.

Question 17

Temperature
Metric unit
SI unit

Answer 17

Measures how hot/cold a substance is
Metric. Celsius
SI. Kelvin

Question 19

Time metric unit

SI unit

Answer 19

Seconds (s) for both metric and SI

Question 20

What does a scientific notation equation consist of?

Answer 20

Coefficient, a power of 10, and a unit of measurement

Question 21

define measured numbers

Answer 21

Numbers you obtain when you measure a quantity using a measuring tool. These numbers are uncertain.

Question 22

Are non zero numbers significant? ex) 2.5 (How many significant figures?)

Answer 22

Yes, 2

Question 23

Are zeros at the end of a decimal significant? ex) 21.00 (How many significant figures?)

Answer 23

Yes, 4

Question 24

Are zeros between nonzero numbers significant? ex) 2.05 (How many significant figures?)

Answer 24

Yes, 3

Question 25

Are coefficients in a scientific notation equation significant? ex? 5.70 x 10^2 (How many significant figures?)

Answer 25

Yes, 3

Question 26

Are zeros at the beginning og a decimal number significant? Ex) 0.004 (How many significant figures?)

Answer 26

No, 1

Question 27

Are zeros used as a place holder in large numbers significant? Ex) 25,000,000

Answer 27

No, 2

Question 28

``` How many significant figures? 5.00 x 10^3 16.00 0.0040 4 x10 ^2 ```

Answer 28

5.00 x 10^3 : 3 16.00 : 4 0.0040 : 2 4 x 10 ^2 : 1

Question 29

What are exact numbers?

Answer 29

Numbers obtained by counting items, are not measured

Question 30

When do you drop numbers when rounding significant figures?

Answer 30

if the first digit to be dropped is 4 or less then all the following digits are simply dropped.

Question 31

When do you round up significant figures?

Answer 31

If the first digit to be dropped is 5 or greater then the last retained number is increased by 1.

Question 32

Round these to 3 and 2 significant figures: 14.780 3262

Answer 32

14. 780: - 3SF: 14.8 - 2SF: 15 3263: - 3SF: 3.26x10^3 - 2SF: 3.3.x 10^3

Question 33

What is/are the rule(s) for rounding off significant figures in multiplication and division?

Answer 33

The final answer is written so it has the same number of significant figures as the measurement with the fewest significant figures.

Question 34

What is/are the rule(s) for rounding off significant figures for addition/subtraction

Answer 34

the final answer has the same number of decimals as the measurement with the fewest decimals

Question 35

What are the prefixes that increase the size of a unit?

Answer 35

peta, tera, giga, mega, kilo

Question 36

Peta Symbol? Numerical Value? Scientific Notation?

Answer 36

Peta: P 1,000,000,000,000,000 10^15

Question 37

Tera Symbol? Numerical Value? Scientific Notation?

Answer 37

Tera T 1,000,000,000,000 10^12

Question 38

Giga Symbol? Numerical Value? Scientific Notation?

Answer 38

giga G 1,000,000,000 10^9

Question 39

Mega Symbol? Numerical Value? Scientific Notation?

Answer 39

mega M 1,000,000 10^6

Question 40

Kilo Symbol? Numerical Value? Scientific Notation?

Answer 40

Kilo k 1,000 10^3

Question 41

What are the prefixes that decrease the size of a unit?

Answer 41

deci, centi, milli, micro, nano, pico, femto

Question 42

deci Symbol? Numerical Value? Scientific Notation?

Answer 42

deci d 0.1 10^-1

Question 43

centi Symbol? Numerical Value? Scientific Notation?

Answer 43

centi c 0.01 10^-2

Question 44

milli Symbol? Numerical Value? Scientific Notation?

Answer 44

milli m 0.001 10^-3

Question 45

micro Symbol? Numerical Value? Scientific Notation?

Answer 45

micro μ(u) 0.000,001 10^-6

Question 46

nano Symbol? Numerical Value? Scientific Notation?

Answer 46

nano n 0.000,000,001 10^-9

Question 47

pico Symbol? Numerical Value? Scientific Notation?

Answer 47

pico p 0.000,000,000,001 10^-12

Question 48

femto Symbol? Numerical Value? Scientific Notation?

Answer 48

femto f 0.000,000,000,000,001 10^-15

Question 49

What is equality?

Answer 49

Equality shows the relationship between two units that measure the same quantity. (same length, different units)

Question 50

What is a cubic centimeter?

Answer 50

Volume of a cube with dimensions of 1 cm on each side, 1cm^3 has the same volume as mL

Question 51

ppm

Answer 51

parts per million (mg/kg)

Question 52

ppb

Answer 52

parts per billion (mg/kg)

Question 53

Formula for density?

Answer 53

Mass of substance/ volume of substance

Question 54

when will a substance float in water?

Answer 54

it it is less dense than water.

Question 55

when will a substance sink in water?

Answer 55

If it is denser than water.

Question 56

What is the density of water?

Answer 56

1