Which of the following is NOT part of Dalton's atomic theory:
a.) the law of multiple proportions
b.) atoms contain a dense center called a nucleus
c.) the law of definite proportions
d.) chemical reactions only involve the separation, combination, or rearrangement of atoms
c.
100
What is the molecular mass of: Cu(NO3)2
187.57 g
100
What is the difference between an electrolyte and nonelectrolyte?
An electrolyte conducts electricity.
100
How can you tell the difference between an ionic and binary compound?
Ionic compound is formed between a metal and nonmetal or polyatomic ion. Binary compound is formed between two nonmetals.
200
How many significant figures will be in the answer of the following problem: 23.86+13.89+30.5
3, 68.3
200
What machine was used in the discovery of the atom?
Cathode Ray Tube
200
What is the average atomic mass of K if its natural abundance is 39 amu, 93.26%, 40 amu, .0117%, and 41 amu, 6.73%
39.14 amu
200
Which of the following is a soluble compound?
a.) Pb(Cl)2
b.) CaSO4
c.) CuSO4
d.) Hg2Br2
c.
200
How many electrons are in the following: F-
10
300
Solve the following and express with correct scientific notation: 8.467 x 10^3 + 4.9 x 10^5
4.98 x 10^3
300
What is the correct formula for chloric acid
HClO3
300
How many molecules of Ca are present in a 20.55 g sample of CaCO3?
1.236 x 10^23 molecules of Ca
300
In the following, what acts as the Bronsted acid?
HF + H2O <--> F- + H3O+
HF (donates a H+)
300
What is the percent of N in ammonium sulfate (NH4)2SO4?
21.22%
400
If a sample has a density of .889 g/cm^3, what would the mass be of a sample that has a volume of 30.2 mL?
26.8 g
400
What is the correct name for the following: AlPO4
aluminum phosphate
400
What are the coefficients needed to balance the following reaction: _NH3 + _CuO --> _Cu + _N2+ _H2O
2 NH3 + 3 CuO --> 3 Cu + N2+ 3 H2O
400
What is the basic formula for a neutralization reaction?
acid + base --> salt + water
400
If the experimental yield is 45.8 g and only 39.2 g are produced, what is the percent yield?
85.6%
500
Convert from 11.28 Mg/cm^3 to ng/L
1.128 x 10^19
500
What is the correct name for the following compound: CuCO3
copper (II) corbonate
500
Given the following chemical equation, how many grams of water are produced when 50.22 g of methane are burned?
CH4 + 2 O2 --> CO2 + 2 H2O
6.274 g
500
What is the net ionic equation for the following:
NiCl2 + K2CO3
Ni+2 + CO3-2 --> NiCO3
500
If 18.6 g of NH3 is reacted with 20.7 g of O2 how much NO will be produced?
4 NH3 + 5 O2 --> 4 NO + 6 H2O