Topic 5 Mass calculations, electrolysis, metals and equilibria Flashcards
1
Q
- What is the formula of water?
A
H2O
2
Q
- What is the formula of sodium chloride?
A
NaCl
3
Q
- What is the formula of carbon dioxide?
A
CO2
4
Q
- The formula of sulfuric acid is H2SO4. How many atoms of each element are in the formula?
A
(H = 2, S = 1, O = 4)
5
Q
- Sodium chloride has the formula NaCl. The relative atomic mass of sodium is 23 and that of chlorine is 35.5. What is the relative formula mass of NaCl?
A
58.5
6
Q
- The relative atomic mass of hydrogen is 1. What is the relative formula mass of hydrogen molecules?
A
2
7
Q
- A water molecule has the formula H2O; the relative atomic mass of hydrogen is 1 and that of oxygen is 16. What is the relative formula mass of water?
A
18
8
Q
- A carbon dioxide molecule has the formula CO2; the relative atomic mass of carbon is 12 and that of oxygen is 16. What is the relative formula mass of carbon dioxide?
A
44
9
Q
- What is the empirical formula of a compound with molecular formula C2H4?
A
CH2
10
Q
- What is the empirical formula of a compound with molecular formula C3H8?
A
C3H8
11
Q
- A sample of magnesium carbonate was heated in an open test tube. Why did it lose mass?
A
gas/carbon dioxide escaped
12
Q
- Why does magnesium increase in mass when it is heated in air?
A
combines with oxygen
13
Q
- How many cm3 are there in 1 dm3?
A
1000
14
Q
- 100 cm3 of a solution contains 1.5 g of salt. What is the concentration of the salt solution in g d3?
A
15
15
Q
- What name is given to an atom that has gained or lost electrons?
A
ion
16
Q
- What type of charge is on metal and hydrogen ions?
A
positive
17
Q
- What type of charge is on most non-metal ions?
A
negative
18
Q
- What is another name for a positive ion?
A
cation
19
Q
- What is another name for a negative ion?
A
anion
20
Q
- What is the symbol for a sodium ion?
A
Na+
21
Q
- What is the symbol for a magnesium ion?
A
Mg2+
22
Q
- What is the symbol for a chloride ion?
A
Cl<span>-</span>
23
Q
- In what states do ionic compounds conduct electricity?
A
when molten or dissolved in water
24
Q
- What is the name of the positively charged electrode?
A
anode
25
43. What type of ions are attracted to the positively charged electrode?
anions / negative ions
26
44. What is the name of the negatively charged electrode?
cathode
27
45. What type of ions are attracted to the negatively charged electrode?
cations / positive ions
28
50. What is produced at the cathode when molten lead bromide is electrolysed?
lead
29
54. What gas is formed when magnesium is added to dilute sulfuric acid?
hydrogen
30
56. What would you see when magnesium is added to dilute sulfuric acid?
effervescence/fizzing/bubbles/magnesium disappears
31
57. Name a metal that does not react with water or dilute acids.
copper/silver/gold/platinum
32
58. What products are formed when zinc is added to copper sulfate solution?
zinc sulfate and copper
33
59. What type of reaction takes place when zinc is added to copper sulfate solution?
displacement
34
61. Name a metal that reacts vigorously with cold water.
potassium/sodium/rubidium/caesium/lithium/calcium
35
62. What gas is produced when a metal reacts with water?
hydrogen
36
63. How do you test for Hydrogen?
It pops a lighted splint.
37
66. Complete the word equation, magnesium + copper sulfate makes ...
copper + magnesium sulfate
38
68. What type of reaction takes place when a substance loses oxygen?
reduction
39
69. Name a metal that occurs uncombined in the Earths crust.
gold/silver/platinum
40
70. Name a metal that could be extracted from its metal oxide by heating with carbon.
zinc/iron/copper
41
72. Name a metal, other than iron, that could be extracted from its metal oxide by heating with carbon.
zinc/copper
42
79. What type of reaction takes place when a metal is extracted from its ore?
reduction/redox
43
80. What type of reaction takes place when a metal corrodes?
oxidation/redox
44
81. What is the definition of oxidation, in terms of oxygen?
gain of oxygen
45
84. What is the specific name for the corrosion of iron?
rusting
46
85. Which of these metals will corrode most quickly - iron, sodium, copper?
sodium
47
86. Why does sodium corrode most quickly.
most reactive metal corrodes most quickly
48
89. What name is given to a process that converts an unwanted product into a new, useful product?
recycling
49
90. Name a type of substance that can be recycled.
metal, plastic, paper, cardboard, glass, etc.
50
99. What can happen in a reversible reaction?
the products can reform the reactants
51
100. What does the term equilibrium describe?
a position of balance
