Measurement and Matter
Periodic Table
Stoichiometry
100

What is the formula for mass and molar mass?

m=n*M

100

Define electron affinity.

energy needed to add 1 mole of electron to one mole of gaseous molecule

100

What is the Avogadro's number?

6.02x10^23 particles/mole

200

How many significant figures are there in 1230 grams of sugar?

three

200
State and explain which is bigger -- Iron or Cobalt atom?

Iron, more shielding effect

200

Balance the equation:

CO2 (g) + H2O (l) --> C6H12O6 (s) + O2 (g)

6 6 1 6

300

Rank the following from lowest to highest boiling point 

F2, NH3, I2

300

State and explain which is more reactive -- Oxygen or Fluorine atom?

Fluorine, higher electronegativity

300

Calculate the molar mass of Ba(OH)2

171.34 g/mol

400
What is the ratio you should set up to convert 600 torr to psi

14.7 psi  /  760 torr


400

Explain why a sulfide ion, S2–, is larger than a chloride ion, Cl-

S gained 2 electrons, Cl only gained 1

400

Calculate the percent composition of CO.

42.88%C, 57.12%O

500

What is the significant figures rule for pH?

Significant figures is the number of digits after the decimal place

500

Carbon has an average atomic mass of 12.011. Describe how this is possible when most carbons have 6 protons and 6 nuetrons.  

Carbon-12 is not the only isotope.  Carbon-13 and Carbon-14 exist in small quantities

500

What mass of carbon is needed to produce 8 moles of carbon dioxide in the reaction: C + O2 --> CO2

96.08grams

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