Acids and Alkalis - 3rd

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

what is the pH for acids?

Back (Answer)

Front (Question)

what is the pH for neutral?

Back (Answer)

Front (Question)

what is the pH for alkaline?

Back (Answer)

> 7

Front (Question)

what colour is methyl orange in an acid?

Back (Answer)

red

Front (Question)

what colour is methyl orange in a neutral substance?

Back (Answer)

yellow

Front (Question)

what colour is methyl orange in an alkaline?

Back (Answer)

yellow

Front (Question)

what colour is phenolphthalein in an acid?

Back (Answer)

colourless

Front (Question)

what colour is phenolphthalein in a neutral substance?

Back (Answer)

colourless

Front (Question)

what colour is phenolphthalein in an alkaline?

Back (Answer)

pink

#10

Front (Question)

what colour is red litmus in an acid?

Back (Answer)

red

#11

Front (Question)

what colour is red litmus in a neutral substance?

Back (Answer)

(stays red)

#12

Front (Question)

what colour is red litmus in an alkaline?

Back (Answer)

blue

#13

Front (Question)

what colour is blue litmus in an acid?

Back (Answer)

red

#14

Front (Question)

what colour is blue litmus in a neutral substance?

Back (Answer)

(stays blue)

#15

Front (Question)

what colour is blue litmus in an alkaline?

Back (Answer)

blue

#16

Front (Question)

what are the colours on the universal indicator from 1-14?

Back (Answer)

0-2 : red 3-4: orange 5-6: yellow 7: green 8-10: light blue 11-13: dark blue 14: purple

#17

Front (Question)

what is air composed of?

Back (Answer)

nitrogen- 78% oxygen- 21% argon- 0.96% carbon dioxide- 0.04%

#18

Front (Question)

what is an experiment to measure the percentage of oxygen in the air ?

Back (Answer)

react oxygen with copper / any metal, the air gradually decreases in volume until all of the oxygen has been added to the metal. SEE FLASHCARD 1(A+A)

#19

Front (Question)

If in an experiment to measure the percentage of oxygen in the air, the results don’t show 21% of oxygen in the air, why must this be?

Back (Answer)

• the metal wasn’t heated for long enough for all the oxygen to be reacted • there’s a leak in the apparatus

#20

Front (Question)

what is element combustion?

Back (Answer)

when an element reacts with oxygen to produce an oxide. element +oxygen-> element oxide

#21

Front (Question)

what would be the oxide name and state symbol for a metal?

Back (Answer)

metal oxide - solid

#22

Front (Question)

what would be the oxide name and state symbol for non-metal?

Back (Answer)

non-metal dioxide - gas

#23

Front (Question)

describe the combustion for magnesium.

Back (Answer)

w.e.- magnesium + oxygen -> magnesium oxide s.e.- 2MG(s) + O2 (g) -> 2MgO (s) observation - bright white light and white powder formed

#24

Front (Question)

describe the combustion for sulphur.

Back (Answer)

w.e.- sulphur + oxygen -> sulphur dioxide s.e.- S(s) + O2 (g) -> SO2 (g) observation - blue flame