LV Chemical properties and changes

0.0(0)
studied byStudied by 0 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/24

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

25 Terms

1
New cards
What is a chemical change?
When particles change into different particles
2
New cards
What is a physical change?
A change in which particles do not change
3
New cards
Why do reactions with a gaseous reactant appear to increase in mass as the reaction occurs?
Because the mass of the gas that reacts is not measurable before the reaction
4
New cards
What is thermal decomposition?
A reaction in which a compound breaks into smaller compounds and elements by the action of heat
5
New cards
What is a salt?
A compound formed when the H atoms of an acid are replaced by a metal (or ammonium) in a neutralisation reaction
6
New cards
What is formed when an acid reacts with a metal
a salt + hydrogen
7
New cards
What is formed when an acid reacts with a metal carbonate
a salt + water + carbon dioxide
8
New cards
What is formed when an acid reacts with an alkali
a salt + water
9
New cards
What pH is neutral
7
10
New cards
What is an indicator
a compound that has different colours in different levels of acidity
11
New cards
What colour is UI in acid, neutral, alkali
red/orange, green, blue/purple
12
New cards
What conditions are required for rusting of iron to occur
presence of air and water
13
New cards
which metal can rust?
iron
14
New cards
What are some examples of physical changes
melting, boiling, freezing, condensing, dissolving, diffusing
15
New cards
How does the mass of reactants compare to that of products in a chemical change?
They are always the same
16
New cards
Why do reactions that produce a gas appear to decrease in mass as the reaction occurs?
Because the gas leaves the reaction system so its mass is gone
17
New cards
What salt is formed when nitric acid is neutralised?
a nitrate salt
18
New cards
What salt is formed when sulfuric acid is neutralised?
a sulfate salt
19
New cards
What salt is formed when hydrochloric acid is neutralised?
a chloride salt
20
New cards
What is the pH range of acids
6 and below
21
New cards
What is the pH range of alkalis
8 and above
22
New cards
What colour is phenolphthalein in acid, alkali
colourless, pink
23
New cards
What colour is litmus in acid, neutral, alkali
red, purple, blue
24
New cards
What conditions are required for rusting of iron to occur
presence of air and water
25
New cards
What elements do all acids contain?
Hydrogen