This is how many extra electrons are in the Lewis structure of the sulfate ion, SO4^2–.
What is 2?
100
This acid is produced in the stomach.
What is hydrochloric acid?
100
The constant bombardment of gas molecules against the inside walls of a container produces this.
What is pressure?
100
Neon-22 contains 12 neutrons. It also contains this many protons.
What is 10?
200
These values were recorded as the mass of products when a chemical reaction was carried out three separate times: 9.83 g; 9.84 g; 9.82 g. The mass of products from that reaction is
8.60 g. The values are
What is precise but not accurate?
200
According to the law of conservation of mass, the total mass of the reacting substances is
What is always equal to the mass of the products?
200
A chemical reaction involving substances A and B stops when B is completely used. B is the
What is limiting reactant?
200
In the equation 2Al(s) + 3Fe(NO3)2(aq)--> 3Fe(s) + 2Al(NO3)3(aq), aluminum replaced
What is iron?
200
An atom is
What is the smallest unit of matter that maintains its chemical identity?
300
In drawing a Lewis structure, each nonmetal atom except hydrogen should be surrounded by
What is 8 electrons?
300
How many minutes are in 1 week?
What is 10,080 min?
300
In the reaction represented by the equation C + 2H2 ® CH4, what is the mole ratio of hydrogen to methane?
What is 2:1?
300
In most chemical reactions the amount of product obtained is
What is less than the theoretical yield?
300
The reaction represented by the equation 2HgO(s) --> 2Hg(l) + O2(g) is a(n)
What is decomposition reaction?
400
The half-life of an isotope is the time required for half the nuclei in a sample to
What is undergo radioactive decay?
400
For the reaction represented by the equation C + 2H2--> CH4, this is how many moles of hydrogen are required to produce 10 mol of methane, CH4.
What is 20 mol?
400
The molar mass of NH3 is 17.03 g/mol. This is how many moles of NH3 are present in 107.1 g.
What is 6.289 mol?
400
This is the molarity of an HCl solution if 125 mL is neutralized in a titration by 76.0 mL of 1.22 M KOH.
What is 0.742 M?
400
This is the molarity of a solution that contains 0.202 mol KCl in 7.98 L solution.
What is 0.0253 M?
500
For the reaction represented by the equation 2H2 + O2 --> 2H2O, this is how many grams of water are produced from 6.00 mol of hydrogen.
What is 108g?
500
When the equation NaI + Pb(SO4)2 ® PbI4 + Na2SO4 is correctly balanced, what is the coefficient of NaI?
What is 4?
500
The density of aluminum is 2.70 g/cm3. What is the mass of a solid piece of aluminum with a volume of 1.50 cm3?
What is 4.05g?
500
If the temperature of a fixed quantity and volume of gas changes, what also changes?
What is pressure?
500
Predict the product of the reaction represented by the following equation:
MgO + CO2 -->