Element Mass
Compound Mass
Periodic Table
% Composition
Lab Experiments
100

The "standard" weight of Hydrogen

What is 1?

100

The mass of sodium chloride, to 2 decimal points

NaCl: Na= 22.99, Cl= 35.45: total =58.44 amu, daltons

100

The number of naturally occurring elements

What is 92?

100

If Mg weighs 24.31 and Oxygen weighs 16, then MgO weighs this..

What is 40.31

100

The reaction of Mg + O2 is an example of this reaction

What is combustion?

200

The "Standard" weight of Nitrogen

What is 14?

200

The "Standard" mass of Oxygen

What is 32?

200

All of the members of a "family" on the periodic table are in a vertical row. All of the family members have the same number of these.

What are valence electrons?

200

Al weighs 26.98 and O weighs 16, AND they combine to form Al2O3. The mass % of Al in the compound must be this.

what is 52.9%

Al: 26.98 x 2= 53.96

O: 16 x 3 = 48

Al2O3 = 101.96

200

The balanced equation for the reaction of Mg + O2 yielding MgO would be 

What is 2 Mg + O2 yields 2 MgO

300

The "Standard" Weight of the most abundant isotope of Carbon

What is 12?

300

The mass of sodium hydroxide: NaOH

Na=22.99 + O (16) + H (1.01) =40

300

All chemistry takes place "here"- at what location- be specific

What is the valence shell

300

A compound of Al and Cl weighs 17.82. If the Al in the compound weighs 3.60, the Cl must weigh what.

What is 79.79: 79.8%

Al + Cl = 17.82, if Al = 3.6, Cl must =14.22

The % Cl is 14.22/17.82

300

The formula to determine % error

What is [(Actual - Theoretical)/Theoretical] * 100

400

The "Standard weight of elemental oxygen.

What is 16?

400

The mass of table sugar, whose structure is C (12) H (22) O (11)

What is: 

12 x 12 = 144

1  x 22 = 22

11 x 16 = 176

[342]

400

There are multiple designs for the periodic table. The one we use w=is based on this person's work.

Who is Mendeleev?

400

1.2 grams of H2 and  13.88 grams O2 are reacted. At the end of the reaction, there is an excess of 5 grams of O2 remaining. The percent by mass of oxygen in water must be what..

What is... a trick question. Water is H2O, H = 1 and O = 16. The % O in H2O is 16/18 = 88.89%

400

The theoretical yield of MgO if you start with 35.4 mg of Mg, would be..

What is 58.7 mg?

500

The "Standard" weight of of either a proton or a neutron

What is 1?

500

The mass % of Al in a sample that contains 1.85 grams of Al and 1.65 grams of O.

What is 52.9%

1.85 / (1.85 + 1.65) = 0.528575: becomes 52.9%

500

The periodic table is organized by the number of these

What are protons?

500

Using the Law of Multiple Proportions, in Compound 1 the ratio of Cu:Cl is 1.793, in Compound 2 the ratio of Cu:Cl is 0.8964. Why, and justify your answer

C1= 1.793, C2= 0.8964, C1/C2 = 2;

C1= Copper (1) Chloride, C2= Copper (II) Chloride

500

The % error in a reaction that has an actual yield of 0.78 mg, but a theoretical yield of 0.8 mg

What is 2.5% error