Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry GCSE Edexcel > Topic 3- Chemical Changes > Flashcards

Topic 3- Chemical Changes Flashcards

You may prefer our related Brainscape-certified flashcards:
GCSE Geography - AQA flashcards AP® Chemistry flashcards GCSE Religious Studies - Edexcel Route B flashcards GCSE Religious Studies - Eduqas Route A flashcards GCSE Religious Studies - Edexcel Route A flashcards GCSE Religious Studies - Eduqas Route B flashcards Periodic Table flashcards Chemistry 101 flashcards Organic Chemistry 101 flashcards
1
Q

What colours does litmus paper turn?

A

Red In acidic solutions

Purple in neutral solutions

Blue in alkaline solutions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What colours does methyl orange turn?

A

Red in acidic solutions

Yellow in neutral and alkaline

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What colours does phenolphthalein turn?

A

Colourless in acidic and neutral

Pink in alkaline solutions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is an acid?

A
  • An acid is a substance with a pH of less than 7
  • Acids form H+ ions in water
  • The higher the concentration of hydrogen ions in the solution the more acidic
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is an alkali?

A
  • An alkali is a base that is soluble in water
  • Alkalis have a pH of more than 7
  • They form OH- ions (hydroxide ions) in water
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is a base?

A

A base is a substance that reacts with an acid to produce a salt and water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is a neutral substance?

A

A neutral substance has a pH of 7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is a strong acid?

A

•strong acids ionise completely in a solution

•they usually have low pHs (pH 0-2)
Eg. Sulphuric, hydrochloric, nitric

(Not to be confused with high concentration)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is a weak acid?

A
  • weak acids don’t fully ionise in a solution

* There pHs are usually 2-6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What happens when acids react with bases?

A

•A salt is formed

Salts are formed during a neutralisation reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What happens when acids react with a metal?

A

•Salts form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How do you test for hydrogen?

A

•using a lit splint, if a hydrogen is present you’ll hear a squeaky pop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How do you test for carbon dioxide?

A

To see if a gas is carbon dioxide you can test it by bubbling it through limewater

If it’s carbon dioxide the limewater will turn cloudy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is electrolysis?

A
  • Electrolysis is the breaking down of a substance using electricity
  • In electrolysis oxidation and reduction occur
  • oxidation is the loss of electrons
  • reduction is the gain of electrons
How well did you know this?
1
Not at all
2
3
4
5
Perfectly

Chemistry GCSE Edexcel (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions