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1.1 Chemistry > Units > Flashcards

Units Flashcards

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1
Q

What are the two different types of units?

A

Fundamental

Derived

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2
Q

What is a fundamental measurement?

2

A

Fundamental units consist of one expression

They are independent of each other

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3
Q

What is a derived measurement?

A

Two or more expressions e.g. volume (l x w x h)

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4
Q

What is the SI unit for length?

A

The meter (m)

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5
Q

What is the SI unit for mass?

A

The kilogram (kg)

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6
Q

What is the SI unit for time?

A

The second (s)

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7
Q

What is the SI unit for temperature?

A

The Kelvin (K)

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8
Q

What is the SI unit for amount of substance?

A

The Mole (mol)

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9
Q

What is the SI unit for current?

A

The Ampere (A)

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10
Q

What is the SI unit for light intensity?

A

Candela (cd)

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11
Q

What is the numerical value of deci?

A

0.1 or 10^-1

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12
Q

What is the numerical value of centi?

A

0.01 or 10^-2

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13
Q

What is the numerical value of milli?

A

0.001 or 10^-3

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14
Q

What is the numerical value of micro?

A

0.0000001 or 10^-6

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15
Q

What is the numerical value of nano?

A

0.0000000001 or 10^-9

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16
Q

What is the numerical value of kilo?

A

1,000 or 10^3

17
Q

List the most frequently used prefixes in descending order.

A 
Kilo
Deci
Centi
Milli
Micro
Nano
18
Q

What is the symbol for nano?

A

n

19
Q

What is the symbol for micro?

A

u (mu)

20
Q

What is the symbol for milli?

A

m

21
Q

How do you set up a conversion factor?

A

Put the unit that you want on tip and what you’ve got on the bottom

22
Q

What is mass?

3

A

The amount of matter in an object

Measured using a balance

Independent of the location of the object

23
Q

What is weight?

3

A

Weight is a measure of the effect of gravity on the object

Measured using a scale which measures force against a spring

Depends on the location of the object

24
Q

What is the formula for density?

A

Density = mass/volume

25
Q

How do you convert K to Celsius?

A

Add 273.15 to C

26
Q

What is ppm?

2

A

Parts per million

A useful measurement for trace analysis

27
Q

Explain how ppm is used.

2

A

1 part in a million is 1x10^6 or 0.0000001

100% is 1,000,000 parts of 10^6 and 1% is 10,000 ppm

28
Q

Give an example of ppm

A

mg/L

1.1 Chemistry (19 decks)

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