WorksheetsCHEM 101 Chapter 2,3,4
Total questions: 68
Worksheet time: 2hrs 41mins
What is the chemical symbol for manganese?
Hg
Cu
Mg
Mn
Which element has the chemical symbol, P?
Lead
Phosphorus
Platinum
Potassium
Sodium belong to Which group of elements.....
halogens
noble gases
alkali metals
alkaline earth metals
Which subatomic particle has the smallest mass?
an electron
a proton
a neutron
an alpha particle
Which of the following two atoms are isotopes?
A
B
C
D
How many protons (p) neutrons (n), and (e) are in an atom of Sr?
38, 45,38
38, 40, 40
38, 49, 38
49, 38, 49
What is the chemical symbol for an atom that has 29 protons and 36 neutrons?
Cu
Kr
Zn
Ni
The formula for dinitrogen trioxide is
N(OH)3
(NO3)2
N2O3
N3O2
Use the periodic table below to answer the following question. Which is the correct formula of the binary fluoride of element A
AF2
AF3
AF5
AF6
Which of the following drawings represents a pure element?
Drawing A
Drawing B
Drawing C
The chemical formula of mercury (II) nitrate is:
Hg(NO3)2
Hg2(NO3)2
HgNO3
Hg2NO3
Which reaction below represents (232)Th(90) decay by alpha emission?
A
B
C
D
Given the following nuclear decay, the missing part is:
Alpha
Beta
Gamma
Positron
Which one of the following statements about balanced equations is true? A reaction is balanced by
changing the charge on an ion.
changing the formula of the molecule
multiplying by suitable coefficients
rearranging atoms in a molecule
What is the sum of the coefficients when the following equation is balanced using the lowest whole-numbered coefficients?
8
11
15
12
What is the mass of a single ozone molecule, O3 ?
2.656 × 10^-23 g
7.969 × 10^-23 g
16.0 g
48.0 g
What is the identity of substance X if 0.380 mol of X weighs 17.5 g?
NO2
NO3
N2O4
N2O
How many sodium atoms are in 3.00 g of sodium dichromate, Na2Cr2O7? (molar mass = 262 g/mol)
0.023 sodium atoms
2.82 × 10^20 sodium atoms
1.97 × 10^21 sodium atoms
1.38 × 10^22 sodium atoms
Which of the following has the greatest mass?
6.02 × 10^23 molecules of Cl2
35.45 g of Cl2
0.500 mol of Cl2
All of these have the same mass.
How many grams of calcium chloride are needed to produce 10.0 g of potassium chloride?
0.134 g
7.44
9.28
18.56
Which one of the following contains 38.7% carbon by mass?
C2H2
CH4
CH3NH2
CO2
The density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 10.00 g of CO2 according to the following chemical equation?
2.06 mL
6.62 mL
3.32 mL
13.34 mL
The density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 10.00 g of CO2 according to the following chemical equation?
C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l)
2.06 mL
3.32 mL
6.62 mL
13.3 mL
If the percent yield for the following reaction is 60.0%, and 45.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq), are produced?
24.6
41.1
54.8
69.3
If the percent yield for the following reaction is 60.0%, and 45.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq), are produced?
3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)
24.6 g
41.1 g
54.8 g
69.3 g
In the reaction between glucose and oxygen, 10.0 g of glucose reacts and 7.50 L of carbon dioxide is formed. What is the percent yield if the density of CO2 is 1.26 g/L?C6H12O6(s) + 6 O2(g) → 6 CO2(g) + 6 H2O(l)
26.1%
40.6%
43.1%
64.5%
In the reaction between glucose and oxygen, 10.0 g of glucose reacts and 7.50 L of carbon dioxide is formed. What is the percent yield if the density of CO2 is 1.26 g/L?
C6H12O6(s) + 6 O2(g) → 6 CO2(g) + 6 H2O(l)
26.1%
40.6%
43.1%
64.5%
The following diagram represents the reaction of A2 (unshaded spheres) with B (shaded spheres). What is the balanced chemical equation for this reaction, and what is the limiting reactant?
2A2 + B → A4B; A2 is the limiting reactant.
2A2 + B → A4B; B is the limiting reactant.
4A2 + 6B → 2A4B; A2 is the limiting reactant
4A2 + 6B → 2A4B; B is the limiting reactant.
What is the empirical formula for ethyl fluoride if the compound contains 49.97% carbon, 10.51% hydrogen, and 39.52% fluorine by mass?
C2H5F
C4H10F2
C4H10F4
C25F2
What is the empirical formula for ethyl fluoride if the compound contains 49.97% carbon, 10.51% hydrogen, and 39.52% fluorine by mass?
C2H5F
C4H10F2
C4H10F4
C25F2
In a solution prepared by mixing CH3OH with H2O the major species present are
CH3OH and H2O
CH3OH, H+, and OH-.
CH3+, OH-, and H2O.
CH3O-, H+, and H2O
The reaction C6H12O6(s) + 6 O2(g) → 6 CO2(g) + 6 H2O(l) is best classified as:
acid-base neutralization reaction.
double replacement reaction.
oxidation-reduction reaction.
precipitation reaction.
What volume of a 0.540 M NaOH solution contains 15.5 g of NaOH?
1.39 L
0.718 L
0.209 L
4.78 L
Which one of the following compounds is insoluble in water?
NH4SO4
KOH
Ca3(PO4)2
Rb2CO3
Write a balanced net ionic equation for the reaction of Pb(NO3)2(aq) with NaI(aq).
Pb(NO3)2(aq) + 2 NaI(aq) → PbI2(s) + 2 NaNO3(aq)
Pb2+(aq) + 2 NO3-(aq) + 2 Na+(aq) + 2 I-(aq) → Pb2+(aq) + 2 I-(aq) + 2 Na+(aq) + 2 NO3-(aq)
Pb2+(aq) + 2 NO3-(aq) + 2 Na+(aq) + 2 I-(aq) → PbI2(s) + 2 Na+(aq) + 2 NO3-(aq)
Pb2+(aq) + 2 I-(aq) → PbI2(s)
Which of the following compounds is an Arrhenius base in water?
CH3CH3
CH3SH
HOCl
KOH
Which of the following is not a strong acid?
HCl
HBr
HI
HF
When dissolved in water, of HClO4, NH3, KOH, HI, and CH3OH which are acids?
NH3 and KOH
HClO4 and HI
only HI
only KOH
Write a net ionic equation for the neutralization reaction of HCN(aq) with NaOH(aq).
HCN(aq) + NaOH(aq) → NaCN(aq) + H2O(l)
HCN(aq) + Na+(aq) + OH-(aq) → Na+(aq) + CN-(aq) + H2O(l)
HCN(aq) + OH-(aq) → CN-(aq) + H2O(l)
H+(aq) + OH-(aq) → H2O(l)
In the following reaction, Cl2 is
2 Rb(s) + Cl2(g) → 2 RbCl(s)
the reducing agent.
the oxidizing agent.
oxidized
the electron donor.
What is the oxidation number of the sulfur atom in S8?
-2
+2
0
+1
What is the oxidation number of the sulfur atom in SO2?
+2
-4
+4
zero
What is the oxidation number change for the iron atom in the following reaction?
2 Fe2O3(s) + 3 C(s) → 4 Fe(s) + 3 CO2(g)
-6
+3
-3
+6
Which species functions as the reducing agent in the following reduction-oxidation reaction?
FeO(s) + C(s) → Fe(s) + CO(g)
FeO(s)
C(s)
CO(g)
Fe(s)
Lithium belongs to the ( blank ) group of the periodic table
Alkaline earth metal
Halogen
Noble gas
Alkali metal
Bromine belongs to the ( blank) group of the periodic table
Noble gas
Halogen
Alkali metal
Alkaline earth metals
Which subatomic particle has the smallest mass?
An alpha particle
An electron
A neutron
A proton
How many protons, neutrons, and electrons are in one atom of 23/12 Mg?
12p ,11n, 14e
12p , 11n, 10e
12p , 12n, 12e
12p , 11n, 12e
In which of the following set do all species have the same number of protons?
Br- , Kr, Sr2+
C, N3- , O2-
O ,O2- , O2+
Mg2+, Sr2+,Ba2+
How many electrons are in the ion, P3-?
18
28
12
34
Identify the chemical symbol Q in 80/34 Q
Hg
Br
Pd
Se
Which of the following represents isotopes?
A : 25/21 B:21/25 C:27/21 D:25/23
A and B
A and D
A and C
C and D
Which reaction below represents 232/90 Th decay by alpha emission?
232/90 Th to 2/4 He + 230/86 Ra
232/90 Th to 1/0 n + 231/90 Ra
232/90 Th to 4/2 He + 228/88 Ra
232/90 Th to 1/1 P + 231/89 Ra
An element has two naturally occurring isotopes. One has an abundance of 37.4% and an isotopic mass of 184.953 amu , and the other has an abundance of 62.6% and a mass of 186.956 amu. What is the atomic weight of the element?
186.207 amu
186.956 amu
185.954 amu
185.702 amu
How many moles of BCI3 are needed to produce 25.0g of HCI(aq) in the following reaction?
4.38 mol
0.686 mol
2.06 mol
0.229 mol
Balance the chemical equation given below, and determine the number of grams of MgO needed to produce 15.0g of Fe2O3
(MgO + Fe = Fe2O3+Mg)
3.78g
0.0877g
11.4g
1.26g
When 10.0g of calcium metal is reacted with water, 5.00g of calcium hydroxide is produced. Using the following balanced equation, calculate the percent yield of the reaction.
(Ca+2H2O= Ca(OH)2+H2)
27.1%
92.4%
13.5%
50.0%
10g of nitrogen is reacted with 5.0g of hydrogen to produce ammonia according to the chemical equation shown below. Which of the following statements is false?
2.8 grams of hydrogen are left over
The theoretical yield of ammonia is 15g
Nitrogen is the limiting reactant
Hydrogen is the excess reactant
How many grams of CaCI2 are formed when 35.00ml of 0.00237M Ca(OH)2 reacts with excess CI2 gas?
(2 Ca(OH)2 + 2CI2 = Ca(OCI)2 + CaCI2 + 2H2O)
0.0184g
0.00460g
0.0217g
0.00921g
What is the concentration of FeCI3 in a solution prepared by dissolving 10.0g of FeCI3 in enough water to make 275 ml of solution?
2.24 x 10^-4
4.46 x 10^3
0.224M
4.46M
What volume of a 0.540M NaOH solution contains 15.5g of NaOH?
1.39L
0.718L
0.209L
4.78L
The reaction Pb(NO3)+K2SO4=PbSO4+2KNO3 is best classified as an
Acid-base neutralization reaction
Precipitation reaction
oxidation-reduction reaction
Single replacement reaction
The reaction 2HNO3 +Ba(OH)2 = Ba(NO3)2 +2H2O is best classified as an
Acid-base neutralization reaction
Precipitation reaction
oxidation-reduction reaction
Single replacement reaction
Water (H2O) , methyl alcohol (CH3OH) , ethyl alcohol (CH3CH2OH) , ethylene glycol (HOCH2CH2OH) , and sucrose (C12H22O11) are commonly classified as
Weak electrolytes
Strong electrolytes
bases
Nonelectrolytes
HBr, HCI, HCIO4, KBr, and NaCI are all classified as
Nonelectrolytes
Strong electrolytes
Bases
Nonelectrolytes
Which pair of compounds is insoluble in water?
(NH4)2SO4 and AgI
AgNO3 and KNO3
Na2S and CuS
PbSO4 and Pb3(PO4)2
Predict the product of a reaction between AgNO3 and KBr
AgNO3 and KBr
Ag and NO
AgBr and KNO3
Ag and Br2
The mixing of which pair of reactants will result in a precipitation reaction?
NaNO3 + NH4CI
Cs + NaOH
HCI + Ca(OH)2
K2SO4 + Ba(NO3)2
