Kingdom of Saudi Arabia
Ministry of Higher Education
Prince Sattam Bin Abdulaziz University
College of Science and Humanity
Department of Chemistry
« QUIZ -1- »
Wednesday, 15 ‫ ﺟﻣﺎدى اﻷوﻟﻰ‬1437
CHEM 1010, Second Term
Name : ............................................................................................ Student No.: ...............................................
MULTIPLE CHOICE. Choose the single choice that best answers the question.
1) The number of units (atoms, molecules, ions) in one mole of a substance is called : __________
A) Its atomic number
B) Avogadro’s Number
C) Its mass number
2) Avogadro’s Number of atoms of any element is equivalent to :
A) 100 g of that element
C) 6.022 x 1023 particles
B) The mass number of that element
3) What is the number of moles of atoms in 9.03 x 1024 atoms ?
A) 1.5 mol
________________________
B) 10 mol
_______________________
C) 15 mol
4) The sum of the atomic masses of the elements or atoms forming the molecule is called : ______
A) Molecular Weight
B) Avogadro’s Number
5) What is the Molecular Weight of (NH4)2SO4 ?
A) 114.09 g/mole
B) 118.34 g/mole
C) Aatomic number
_________________________
C) 132 g/mole
6) The Mwt of NO2 is 46.01 g/mole. How many moles of NO2 are present in 69.02 g ? _________
A) 6.9 mol
B) 1.5 mole
7) What is the percent composition of CO ?
A) 12 % C, 88 % O
B) 25 % C, 75 % O
C) 4.6 mole
_______________________
C) 43 % C, 57 % O
8) What is the Empirical Formula for a compound that is 53.3 % O and 46.7 % Si ? ___________
A) SiO
B) SiO2
9) True or False ? The MF for H2O is the same as the EF
A) True
_____________________
B) False
10) What is the relationship between Mole and Mass ?
A) 𝑛 =
C) Si2O
𝑚
𝑀𝑤𝑡
B) 𝑛 =
𝑀𝑤𝑡
𝑚
_____________________
C) 𝑛 = 𝑀𝑤𝑡 𝑥 𝑚
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Kingdom of Saudi Arabia
Ministry of Higher Education
Prince Sattam Bin Abdulaziz University
College of Science and Humanity
Department of Chemistry
11) Propane (C3H8) is a component of natural gas and is used in domestic cooking and heating.
The balanced reaction for its combustion is given by which of the following : ________________
A) C3H8 + 5 O2
B) C3H8 + 5 O2
C) C3H8 + 4 O2
→
→
→
3 CO2 + 4 H2O
3 CO2 + 3 H2O
2 CO3 + 4 H2O
12) According to the balanced reaction, how many grams of carbon dioxide (CO2) is produced by
burning 3.85 moles of propane ?
_________________________
A) 408.2 g
B) 508.2 g
C) 520.2 g
13) Limiting Reactant (LR) is :
_________________________
A) The reactant that is present in excess
B) The reactant that is completely consumed
C) The reactant that is not completely consumed
14) 3H2 + N2 → 2NH3. If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce
ammonia, which element is the excess reactant ?
___________________________
A) Hydrogen (H2)
B) Nitrogen (N2)
15) Percentage Yield is defined as :
___________________________
𝐴𝑐𝑡𝑢𝑎𝑙 𝑌𝑖𝑒𝑙𝑑
A) 𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑌𝑖𝑒𝑙𝑑 = 𝑇ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝑌𝑖𝑒𝑙𝑑 𝑥 100
B) 𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑌𝑖𝑒𝑙𝑑 =
𝑇ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝑌𝑖𝑒𝑙𝑑
𝐴𝑐𝑡𝑢𝑎𝑙 𝑌𝑖𝑒𝑙𝑑
𝑥 100
C) 𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑌𝑖𝑒𝑙𝑑 = 𝑇ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝑌𝑖𝑒𝑙𝑑 𝑥 𝐴𝑐𝑡𝑢𝑎𝑙 𝑌𝑖𝑒𝑙𝑑
16) Molarity is defined as :
___________________________
𝑀𝑜𝑙𝑒𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒 (𝑛)
A) 𝑀𝑜𝑙𝑎𝑟𝑖𝑡𝑦 = 𝐿𝑖𝑡𝑒𝑟𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 (𝑉)
B) 𝑀𝑜𝑙𝑎𝑟𝑖𝑡𝑦 = 𝑀𝑜𝑙𝑒𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒 (𝑛) 𝑥 𝐿𝑖𝑡𝑒𝑟𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 (𝑉)
C) 𝑀𝑜𝑙𝑎𝑟𝑖𝑡𝑦 =
𝐿𝑖𝑡𝑒𝑟𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 (𝑉)
𝑀𝑜𝑙𝑒𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒 (𝑛)
17) A 31.4 mL of a solution of (KOH) requires 22 ml of 0.5 M (H2SO4) for complete reaction:
2KOH + H2SO4 → K2SO4 + 2H2O. What is the Molarity of the (KOH) ? ____________________
A) 0.07 M
B) 0.5 M
C) 0.7 M
18) When electrons are gained during the reaction, this is what called a : ___________________
A) Oxidation
B) Reduction
C) Redox
19) When electrons are lost during the reaction, this is what called a : ______________________
A) Oxidation
B) Reduction
C) Redox
20) In the following oxidation-reduction reaction : NO3- + SO32- → SO42- + NO2- ___________
A) NO3- is the reducing agent ; SO32- is the oxidizing agent
B) NO3- is the oxidizing agent ; SO32- is the reducing agent
C) Both NO3- and SO32- are oxidizing agent
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