goood chemistry lab

Topics: Oxygen, Molecule, Sodium hydroxide Pages: 9 (1528 words) Published: April 3, 2014
(Chemistry IB)

1. How many molecules are present in 27.0 g of distilled water? A. 2.7 x 1024
B. 1.5
C. 9.0 x 1023
D. 4.5
2. How many moles of carbon dioxide will be formed when 32.0 g of methane, CH4, burns completely in oxygen?
A. 1.0
B. 2.0
C. 4.0
D. 8.0
3. How many oxygen atoms are present in 0.5 mole of pentahydrated copper(II) sulfate, CuSO4.5H2O?
A. 2.5
B. 4.5
C. 3.0 x 1023
D. 2.7 x 1024
4. What is the total number of atoms in 3.0 molecules of propanone, CH3COCH3? A. 10
B. 30
C. 1.8 x 1024
D. 1.8 x 1025
5. Which contains the same number of ions as the value of Avogadro’s constant? A. 0.5 mol KBr
B. 0.5 mol CaBr2
C. 1.0 mol CaO
D. 1.0 mol K2O
6. Which molecular formulas are possible for a compound which has an empirical formula of C2H4O?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
7. Which compound has the empirical formula with the largest mass? A. CH4
B. C2H4
C. C2H6
D. C6H6
8. What is the maximum mass, in grams, of magnesium oxide that can be formed when 4.8 g of magnesium reacts with oxygen?
A. 4.8C. 11.2
B. 8.0D. 12.8

9. Which is a correct statement about the molecular formula of a compound? A. It shows which functional groups are present in the molecule. B. It shows how all the atoms are bonded in a molecule.
C. It is the simplest ratio of the atoms of different elements in the molecule. D. It is an integral multiple of the empirical formula.
10. 98 g of a pure hydrocarbon contains 84 g of carbon. Which statements are correct? I. The compound has an empirical formula of CH2.
II. The compound has a molecular formula of C7H14.
III. Not enough information has been given to deduce the molecular formula. A. I and II only
B. I and III only
C. II and III only
D. I, II and III
11. 32 g of a metal, M, reacts with 8 g of oxygen to form an oxide. The formula of the oxide is MO. What is the atomic mass of M in g mol-1?
A. 16
B. 32
C. 64
D. 128
12. What is the maximum mass of iron, in tonnes, that can be obtained when 40 tonnes of iron(III) oxide, Fe2O3 (Mr = 160) are reduced in a blast furnace according to the equation below?
Fe2O3 + 3CO → 2Fe + 3CO2
A. 14
B. 28
C. 56
D. 80
13. When the equation for the combustion of 1 mole of propane is balanced what is the coefficient for oxygen, O2(g)?
C3H8(g) + __ O2(g) → __ CO2(g) + __ H2O(l)
A. 5
B. 7
C. 10
D. 14
14. What is the maximum amount of methanol, in mol, that could be formed when 4 mol of carbon dioxide and 6 mol of hydrogen gas are placed in a container and react according to the equation below?

CO2(g) + 3H2(g) → CH3OH(l) + H2O(l)
A. 1
B. 2
C. 3
D. 4
15. When the equation for the complete combustion of two mol of propyne, C3H4, is balanced what is the sum of all the coefficients?
2C3H4(g) + __ O2(g) → __ CO2(g) + __ H2O(l)
A. 16
B. 18
C. 20
D. 22
16. 1 mol of any gas occupies 24 dm3 at room temperature and pressure. When 32 g of methane burn completely in oxygen at room temperature and pressure what volume of carbon dioxide, in dm3, will be formed?

A. 16
B. 24
C. 32
D. 48
17. What volume of ammonia, in dm3, can be made from 30 dm3 of nitrogen and 60 dm3 of hydrogen? Assume that all volumes are measured at the same temperature and pressure and that the reaction goes to completion according to the equation: N2(g) + 3H2(g) → 2NH3(g)

A. 40
B. 60
C. 90
D. 180
18. Ethane burns in oxygen according to the equation below. What volume of oxygen, in dm3, reacts with 0.8 dm3 of ethane?
2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l)
A. 0.8
B. 1.6
C. 2.8
D. 5.6
19. Which solution contains the most amount of sodium hydroxide? A. 10.0 cm3 of 0.700 mol dm-3 NaOH
B. 20.0 cm3 of 0.600 mol dm-3 NaOH
C. 30.0 cm3 of 0.500 mol dm-3 NaOH
D. 40.0 cm3 of 0.400 mol dm-3 NaOH
20. Which is a correct statement about solutions?
A. When cholesterol dissolves in fat, cholesterol is the solute and fat is the...
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