C0 Chemical literacy

Question 1

what are the 7 core units in the SI system?

Answer 1

• mass
• length
• time
• electrical current
• temperature
• amount of substance
• light intensity

Question 2

what are the units for mass in the SI system?

Answer 2

grams, g

Question 3

what are the units for length in the SI system?

Answer 3

metre, m

Question 4

what are the units for time in the SI system?

Answer 4

seconds, s

Question 5

what are the units for electrical current in the SI system?

Answer 5

amperes, A

Question 6

what are the units for temperature in the SI system?

Answer 6

kelvin, K

Question 7

what are the units for amount of substance in the SI system?

Answer 7

moles, mol

Question 8

what are the units for light intensity in the SI system?

Answer 8

candela, cd

Question 9

what are derived units?

Answer 9

units defined by the core units in a system of equations

eg.
area is metres squared (derived from length)

Question 10

10¹² prefix

Answer 10

tera, T

Question 11

10⁹ prefix

Answer 11

giga, G

Question 12

10⁶ prefix

Answer 12

mega, M

Question 13

10³ prefix

Answer 13

kilo, k

Question 14

10² prefix

Answer 14

hecto, h

Question 15

10¹ prefix

Answer 15

deca, da

Question 16

10⁻¹ prefix

Answer 16

deci, d

Question 17

10⁻² prefix

Answer 17

centi, c

Question 18

10⁻⁶ prefix

Answer 18

micro, μ

Question 19

10⁻⁹ prefix

Answer 19

nano, n

Question 20

10⁻¹² prefix

Answer 20

pico, p

Question 21

10⁻¹⁵ prefix

Answer 21

femto, f

Question 22

10⁻¹⁸ prefix

Answer 22

atto, a

Question 23

when referring to volume in concentrations, what unit should be used?

Answer 23

litres, L
NOT decimetres

Question 24

what are 1mL, 1L and 1000L in decimetres cubed?

Answer 24

• 1L = 1dm³
• 1000L = 1m³
• 1mL = 1cm³

Question 25

what is the difference between molar and mole?

Answer 25

• molar is the unit of concentration (M)
• mole is the unit of amount of substance (mol)

Question 26

what is 1M in concentration?

Answer 26

1 M = 1 mol/L

Question 27

what are isotopes?

Answer 27

• same atomic number
• different mass number
• different number of neutrons

Question 28

what is the mass of an atom expressed as? (the unit, what it is equivalent to and its symbol)

Answer 28

• ‘unified atomic mass units’
• 1 unified atomic mass unit = 1/12 of the mass of an atom of carbon-12
• symbol: u

Question 29

what is the numerical value of Avogadro’s constant?

Answer 29

6.022 x 10^23

Question 30

why is there a difference between the theoretical mass of a carbon-12 atom (12.094 atomic mass units) and the actual mass (12 atomic mass units)?

Answer 30

• the differences resembles the energy which is released when the subatomic particles (protons, neutrons and electrons) come together to form the atom
• the difference (0.094 atomic mass units) is called the mass deficit/mass defect