Quiz 1 basic chemistry

1. The following substance consist of molecules except
A. Chlorine gas
B. Oxygen gas
C. Hydrogen gas
D. Argon gas
2. Identify the correct pair for atomic symbol and its name
A. Iron, Ir
B. Magnesium, Mg
C. Cobalt, CO
D. Tin, Ti
3. The correct name for CCl4 is
A. Carbon chloride
B. Carbon chloromethane
C. Carbon tetrachlorate
D. Carbon tetrachloride
4. Select the correct definition of ion.
A. A non-charged particle
B. A charged particle either positive or negative
C. A substance that cannot be separated into a simpler substance
D. The basic unit of element
5. Identify the correct name of the following compounds
A. N2O4
C. Mg(OH)2
D. Ca3(PO4)2
nitrogen dioxide
carbon dioxide
magnesium hydride
calcium phosphate
6. Identify the element that contain 1.5 x 1023 atoms
A. 8 g O2
B. 10 g Ca
C. 17 g Mg
D. 5 g N2
7. 2.00 mol of CO2
A. Have a mass of 56.0 g
B. Contain 1.20 x 1024 molecules
C. Have a mass of 44 g
D. Contain 6 molar masses of CO2
8. Calculate the number of Nitrogen atoms in 40 g of NH4NO3.
(Avogadro’s number= 6.02 x1023)
(RMM NH4NO3= 80 g/mol)
A. 1.0 mol
B. 80 mol
C. 3.01 x 1023
D. 6.02 x 1023
9. Determine the percentage by mass of sodium in Na2CO3
A. 12.6%
B. 23.0%
C. 47.7%
D. 43.4%
10.Identify the compound that contain 35% N
C. NH4Cl
11.Compound X has the empirical formula of CH2. Given the molar mass of
compound X is 112 g/mol, determine its molecular formula
A. C8H16
B. CH2
C. C5H10
D. C8H18
12.Select the incorrect balance chemical equation
A. 2N2O5
C. P4O10 + 6H2O
D. 2Al + 3H2SO4
2N2O4 + 3O2
N2 + 2H2O
Al2(SO4)3 + 3H2
13. Excess reagent is
A. The left over reagent after the reaction has completed
B. The reagent that has the largest mass
C. The reagent has the smallest mass
D. The one that has larger atomic mass

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