Topic 4 Acids and alkalis Flashcards
1
Q
- What term describes a substance that attacks metals, stonework and skin?
A
corrosive
2
Q
- Name an acidic solution found in the kitchen.
A
vinegar or fruit juice, etc.
3
Q
- Name an alkaline solution used in the kitchen.
A
bleach or oven cleaner or soap, etc.
4
Q
- What type of substance turns litmus paper red?
A
acid
5
Q
- How does an indicator show the acidity or alkalinity of solutions?
A
by changing colour
6
Q
- What pH values represent alkaline solutions?
A
above 7 or 8 to 14
7
Q
- What kind of reaction occurs between an acid and an alkali?
A
neutralisation
8
Q
- What do you call a solution that is neither acidic nor alkaline.
A
neutral
9
Q
- Which ion is in excess in all acidic solutions?
A
hydrogen ions or H+ ions
10
Q
- Which ion is in excess in all alkaline solutions?
A
hydroxide ions or OH- ions
11
Q
- What scale is used for measuring acidic and alkaline properties?
A
the pH scale
12
Q
- Name three examples of acid/alkali indicators apart from universal indicator.
A
litmus, methyl orange and phenolphthalein
13
Q
- What would you use to measure pH to one decimal place?
A
a pH meter
14
Q
- What pH values are acidic?
A
below 7
15
Q
- What word describes a solution that contains a large amount of solute in a small volume of solvent?
A
concentrated
16
Q
- How can a solution be made more dilute?
A
by adding solvent/water
17
Q
- What kind of reaction occurs between an acid and a base?
A
neutralisation
18
Q
- What acid would be used to make zinc sulfate from zinc oxide?
A
sulfuric acid
19
Q
- How can a sample of a dissolved salt be obtained from a salt solution?
A
evaporation of the water
20
Q
- Which salt is formed when copper oxide reacts with sulfuric acid?
A
copper sulfate
21
Q
- Name the acid that has the formula HCl.
A
hydrochloric acid
22
Q
- What colour is phenolphthalein in alkaline solutions?
A
pink
23
Q
- What is the formula for sulfuric acid?
A
H2SO4
24
Q
- What is the formula for hydrochloric acid?
A
HCl
25
47. What colour is phenolphthalein in acidic solutions?
colourless not clear
26
48. Name a piece of apparatus used to measure volumes of liquid.
measuring cylinder/pipette/burette
27
49. Name the separation method used to produce crystals from a solution.
crystallisation
28
50. Name the acid needed to make ammonium nitrate.
nitric acid
29
51. Which acid can be used to make copper sulfate?
sulfuric acid
30
59. Which gas is formed when dilute hydrochloric acid reacts with magnesium?
hydrogen
31
60. Which gas is formed when dilute hydrochloric acid reacts with magnesium carbonate?
carbon dioxide
32
61. What acid can be used to make copper chloride?
hydrochloric acid
33
63. How do you identify hydrogen gas?
gives a squeaky pop with a lighted splint
34
64. What is seen when magnesium is added to dilute sulfuric acid?
effervescence/fizzing/bubbles
35
66. What gas is produced when copper carbonate is added to dilute nitric acid?
carbon dioxide
36
67. How do you test for carbon dioxide?
it turns limewater milky
