Chemical & Physical Reactions

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

Card preview (24)

Front (Question)

What is a chemical reaction?

Back (Answer)

When a chemical reaction takes place, one or two new substances are made. A chemical reaction CANNOT be reversed

Front (Question)

Name 5 points from which we know a chemical reaction is taking place

Back (Answer)

• A change in colour • Bubbles that show us a gas is being made • A change in mass as a gas escapes • Light energy being given out • A change in temperature

Front (Question)

What is a physical change?

Back (Answer)

Something that CANNOT create a new substance. Something that CAN be reversed

Front (Question)

Examples of CR and PC…

Back (Answer)

PC: Boiling the kettle Alcohol evaporating Freezing yoghurt CR: Making toast Frying an egg Neutralising an acid

Front (Question)

Why is neutralising an acid not a physical change?

Back (Answer)

Because you have 2 reactants that create a new product

Front (Question)

Testing for Hydrogen is also called the…

Back (Answer)

Squeaky pop test

Front (Question)

What gas is produced in the Squeaky Pop Test?

Back (Answer)

Hydrogen

Front (Question)

Hydrogen is lighter than air. What proof of this have you seen in this experiment?

Back (Answer)

The pop was at the top of the test tube as this is where most of the gas was as the hydrogen went up meaning it was lighter than air.

Front (Question)

Is hydrogen gas flammable

Back (Answer)

Yes

#10

Front (Question)

Do metals always make hydrogen gas when reacting with acids?

Back (Answer)

No, Copper for example doesn’t react with acids because it’s lower down on the reaction table.

#11

Front (Question)

What is the test called when magnesium reacted with hydrochloric acid?

Back (Answer)

The Squeaky pop test

#12

Front (Question)

What is the test for Carbon dioxide?

Back (Answer)

Putting gas through limewater. Positive result: limewater turns milky and cloudy

#13

Front (Question)

What is the test for hydrogen?

Back (Answer)

Hold a lit splint in the gas Positive result! Burns with a squeaky pop

#14

Front (Question)

What is the test for oxygen?

Back (Answer)

Hold a glowing splint in the gas Positive result: Relights splint

#15

Front (Question)

Metal + acid

Back (Answer)

Salt + hydrogen

#16

Front (Question)

Carbonate + acid

Back (Answer)

Salt + water + Carbon Dioxide

#17

Front (Question)

In air - Carbon

Back (Answer)

Orange flame

#18

Front (Question)

In air - Sulphur

Back (Answer)

Blue, small flame

#19

Front (Question)

In air - zinc

Back (Answer)

Blue silver

#20

Front (Question)

In air - calcium

Back (Answer)

Orange flame - rocks go white

#21

Front (Question)

in air - Iron

Back (Answer)

Orange/ gold like a sparkler

#22

Front (Question)

in air - Magnesium

Back (Answer)

Bright white flame

#23

Front (Question)

Test for water

Back (Answer)

Putting cobalt chloride paper into water Positive result: turns pink

#24

Front (Question)

Independent

Back (Answer)

The variable that you change