Element Mass
The "standard" weight of Hydrogen
What is 1?
The mass of sodium chloride, to 2 decimal points
NaCl: Na= 22.99, Cl= 35.45: total =58.44 amu, daltons
The number of naturally occurring elements
What is 92?
If Mg weighs 24.31 and Oxygen weighs 16, then MgO weighs this..
What is 40.31
The reaction of Mg + O2 is an example of this reaction
What is combustion?
The "Standard" weight of Nitrogen
What is 14?
The "Standard" mass of Oxygen
What is 32?
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?
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
The balanced equation for the reaction of Mg + O2 yielding MgO would be
What is 2 Mg + O2 yields 2 MgO
The "Standard" Weight of the most abundant isotope of Carbon
What is 12?
The mass of sodium hydroxide: NaOH
Na=22.99 + O (16) + H (1.01) =40
All chemistry takes place "here"- at what location- be specific
What is the valence shell
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
The formula to determine % error
What is [(Actual - Theoretical)/Theoretical] * 100
The "Standard weight of elemental oxygen.
What is 16?
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]
There are multiple designs for the periodic table. The one we use w=is based on this person's work.
Who is Mendeleev?
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%
The theoretical yield of MgO if you start with 35.4 mg of Mg, would be..
What is 58.7 mg?
The "Standard" weight of of either a proton or a neutron
What is 1?
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%
The periodic table is organized by the number of these
What are protons?
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
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