Brainscape's Knowledge GenomeTM

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


See full index

Chemistry > Chemical changes > Flashcards

Chemical changes Flashcards

You may prefer our related Brainscape-certified flashcards:
Chemistry 101 flashcards AP® Chemistry flashcards Periodic Table flashcards Organic Chemistry 101 flashcards
1
Q

What are the different pH’s?

A

pH 7- neutral
pH0-6- acid
pH 8-14- alkalis

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

How can you measure the pH of a solution?

A
  • using an indicator
  • using a pH probe attached to a pH meter- place it in solution and it will give you a numerical value
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is an acid?

A

a substance that forms aqueous solutions with a pH of less than 7 and forms H+ ions

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

What is a base?

A

a substance with a pH greater than 7

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

What is an alkali?

A

a base that dissolves in water to form a solution with a pH greater than 7 and form OH- ions in water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the reaction between acids and bases called?

A

neutralisation

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

What is the word equation for neutralisation?

A

acid+base–> salt+water

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

What is titration used for?

A

allow you to find out exactly how much acid is needed to neutralise a quantity of alkali

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

Describe the process of titration

A
  1. use a pipette to add a set volume of alkali to a conical flask and add 2-3 drops of indicator
  2. use a funnel to fill a burette with some acid of known concentration- do this below eye level incase acid spills over and record the initial volume of acid
  3. add the acid to the alkali a bit at a time swirling flask in between
  4. the indicator changes colour when all the alkali has been neutralised
  5. record the final volume of acid in burette and calculate volume of acid used to neutralise the alkali
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How do you increase the accuracy of your titration?

A
  • first do a rough titration
  • repeat the whole thing several times to check if you are getting consistent results
  • calculate the mean of your results
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are some single indicators and what colours are they in acids and alkalis?

A
  • litmus (blue in alkalis and red in acids)
  • phenolphthalein (pink in alkalis and colourless in acids)
  • methyl orange (yellow in alkalis and red in acids)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is meant by a strong acid?

A

when an acid ionises completely in water and all acid particles dissociate to release H+ ions

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

What are some examples of strong acids?

A
  • sulfuric acid
  • hydrochloric acid
  • nitric acid
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is meant by a weak acid?

A

an acid that does not fully ionise in solution and only a small proportion of acid particles dissociate to release H+ ions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are some examples of weak acids?

A
  • ethanoic acid
  • citric acid
  • carbonic acid
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the concentration of an acid?

A

measures how much acid there is in a certain volume of water

17
Q

What is the reactivity series?

A

Potassium
Sodium
Lithium
Calcium
Magensium
Carbon
Zinc
Iron
Hydrogen
Copper

18
Q
A

Chemistry (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions