IB Chemistry Summer Review #4... lots of miscellaneous review

What is the number of sig figs in the datum, 125 g?

• 1
• 2
• 3
• 4

Answer explanation

All non-zero digits (numbers that aren't zero) are significant, so all three of the digits in 125 are significant.

Datum = singular piece of data

Data = plural

How many protons in one sodium atom?

• 1
• 11
• 12
• 23

Which of these is/are a p block element?

• Se
• Sc
• S
• Sr

How many electrons in one F^- ion?

• 9
• 10
• 19
• 20

What is the correct name of the compound NaNO₃?

• sodium nitrate
• nitrogen trioxygen
• sodium nitrotrioxide
• sodium nitrite

A positively charged particle is called what?

• acidic
• basic
• cation
• anion

The gain of electrons and/or protons is...

• oxidation
• reduction
• synthesis
• single replacement

Answer explanation

Remember that LEO says GER...

Lose Electrons/protons is Oxidation

Gain Electrons/protons is Reduction

In the formula PV=nRT, the T represents what?

• temperature in Celsius
• temperature in Kelvin
• time in hours
• time in seconds

Answer explanation

This is the ideal gas law where...

P = pressure

V = volume

n = the number of moles

R = ideal gas constant

T = temperature in KELVIN!

Which of these is/are a noble gas?

• hydrogen
• helium
• radium
• xenon

Deduce the molar mass of C₂H₄ in g mol^-1.

Answer explanation

To find molar mass, add the masses of the atoms from the periodic table...

C = 12.01

H = 1.01

C₂H₄ = (2 x 12.01) + (4 x 1.01) = 28.06 g mol^-1

g mol^-1 means grams (g) times moles to the -1 power... -1 power means it's in the denominator of a fraction which means divided by