Oxidation & Reduction treasure hunt
Delve into the world of oxidation and reduction with our interactive GPS scavenger hunts. Discover how electrons are exchanged between atoms and molecules as you adventure through the real world.
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Be the first to create a chemistry treasure huntFeatured this week: example questions for Oxidation & Reduction
New example questions from the library every Monday. Updated on 12 October 2026.
What does a plant do with sunlight?
Plays with it
Turns it into food
Clogs it
Throws it away
What happens to wood in fire?
It becomes water
It burns
It becomes stone
It will be ice cream
Which fruit turns brown when you cut it?
Grapes
Apple
Strawberry
Kiwi
Why does an old car get rusty?
By driving too much
Through air and water
Due to too much noise
By too much light
What does fire need to burn?
Water
Oxygen
Candy
Music
What colour will an old copper coin be?
Red
Green-blue
Yellow
White
Why does bread turn dark in the toaster?
Due to the heat
By music
By water
By wind
What breaks a candle?
Too much light
No oxygen
Too much noise
Too much colour
What happens to dry leaves when you burn them?
They turn to ash
They turn greener
They start to grow
They turn into water
What happens when autumn leaves lie on the ground?
They slowly turn browner
They turn greener
They start to fly
They get bigger
What happens when dad lights the barbecue?
The charcoal burns with oxygen
The charcoal gets softer
The charcoal gets wetter
The charcoal gets greener
What happens when you hold marshmallows over a fire?
They turn brown and get softer
They turn blue
They start singing
They get bigger
What does a car need in order to burn gasoline?
Oxygen
Water
Milk
Juice
What makes the smoke in a campfire?
Burning wood
Water
Wind
Stones
What happens when leaves wither?
They turn brown and crispy
They turn greener
They start to fly
They turn purple
Why does meat turn brown when mom fries it?
Because of heat and oxygen
Because of salt
Because of the pan
Because of the table
What does oxygen do to a glowing piece of wood?
It catches fire
It turns white
Getting cold
It gets heavier
What happens when you set off fireworks?
Rapid oxidation takes place
Water is made
Ice cream is made
Sand is made
Which planets have oxygen in the air?
Earth alone
All planets
Mars and Venus
Jupiter and Saturn
What is fuel in a car?
Something that can oxidise for energy
Something that makes the car heavier
Something that makes the car more beautiful
Something that makes noise
What happens when you put lemon juice on an apple?
The apple is less likely to brown
The apple turns brown faster
The apple gets bigger
The apple gets harder
Which metal never rusts?
Gold
Iron
Steel
Tin
What happens when you burn sugar?
It turns black and smokes
It becomes white powder
It will be blue water
It becomes green crystals
What prevents food from spoiling?
Keeping away from oxygen
Giving more light
Shake harder
Softer treatment
Why can you extinguish a candle by putting a glass over it?
Oxygen is running out
It gets too hot
Too much light is coming in
The glass becomes too heavy
What happens when you burn a piece of magnesium?
It becomes white powder
It becomes black powder
It becomes red powder
It turns yellow powder
Why do firefighters have to wear oxygen masks?
Because fire consumes all the oxygen
Because fire consumes all the nitrogen
Because fire produces oxygen
Because fire produces water
What is the scientific term for combustion?
Rapid oxidation
Rapid reduction
Rapid evaporation
Fast condensation
What is rust anyway?
Iron combined with oxygen
Iron combined with water
Iron combined with salt
Iron combined with sand
Which metal does NOT rust?
Gold
Iron
Steel
Tin
What is created when wax candles burn?
Carbon dioxide and water vapour
Oxygen and water vapour
Nitrogen and carbon
Iron and water
What happens to an apple if you cut it up and leave it for a while?
It turns brown due to oxidation
He turns green by reduction
It turns blue by evaporation
It turns white due to condensation
What happens to magnesium when it burns?
It gives off a bright white light
It turns blue
It dissolves in the air
It liquefies
Why does copper turn green over time?
By oxidation with oxygen and moisture
Through contact with plastic
By magnetism
Due to radioactive radiation
Which factor delays rusting the most?
Dry air
Humid air
Saltwater
High temperature
What substance in the air causes rust?
Oxygen
Nitrogen
Argon
Helium
What happens to iron when it rusts?
Iron is oxidised
Iron is reduced
Iron dissolves in water
Iron hardens
What is the colour of copper oxide?
Green
Red
Yellow
Purple
What is photosynthesis?
The reverse of combustion
A kind of combustion
Taking pictures
Growing plants
What can you do to put out a fire?
Taking away oxygen
Add more fuel
Increasing the temperature
Adding more air
What happens to the pH during oxidation of NH₃ to NO₂-?
pH drops
pH rises
The pH remains the same
The pH becomes neutral
What process takes place when an apple turns brown?
Oxidation
Reduction
Hydrolysis
Fermentation
What colour will copper oxide (CuO) be?
Black
Green
Blue
Red
Which substance is always reduced in combustion?
Oxygen
Carbon
Hydrogen
Nitrogen
What is the role of NADH in cellular respiration?
It is a reductor
It is an oxidiser
It is an enzyme
It is a substrate
What happens to electrons during oxidation?
They are ceded
They are recorded
They change colour
They disappear
What happens to aluminium when exposed to air?
A protective oxide layer forms
It dissolves completely
It becomes magnetic
It changes colour to green
What process takes place in metal electroplating?
Reduction of metal ions
Oxidation of metal atoms
Neutralisation of acids
Evaporation of water
Baeyer-Villiger oxidation results from ketones:
Esters
Aldehydes
Alcohols
Carboxylic acids
What is the oxidation state of oxygen in OF₂?
+2
-2
-1
What is the oxidation state of carbon in CH₄?
-4
+4
-2
At the Jones reduction is used:
Zinc in hydrochloric acid
Magnesium in water
Aluminium in base
Iron in acetic acid
What is the oxidation state of iron in Fe(CO)₅?
+2
+3
-2
When zinc reacts with hydrochloric acid, it forms:
ZnCl₂ + H₂
ZnCl + H₂O
Zn(OH)₂ + Cl₂
ZnO + HCl
What is the oxidation state of sulphur in H₂S₂O₈?
+6
+4
+8
+7
What is the oxidation state of tin in SnO₂?
+4
+2
+6
-2
What is the oxidation state of manganese in MnO₂?
+4
+2
+6
+7
In the electrolysis of molten NaCl, what product is formed at the cathode?
After
Cl₂
H₂
NaOH
What is the oxidation state of sulphur in H₂SO₃?
+4
+6
+2
-2
In the half equation Cr₂O₇²- → Cr³⁺, how many electrons are included?
6
3
12
9
In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, what is reduced?
Cu²⁺
Zn
Zn²⁺
Cu
What is the standard electrode potential of hydrogen?
0,00 V
1,00 V
-1,00 V
2,00 V
What happens at the cathode during electrolysis?
Reduction
Oxidation
Disproportionate
Neutralisation
In the reaction MnO₄- + 8H⁺ + 5e- → Mn²⁺ + 4H₂O, how many electrons are taken up?
5
3
8
1
What is the oxidation state of nitrogen in nitrite anion (NO₂-)?
+3
+5
+1
+4
Which substance acts as an electron carrier in photosynthesis?
NADPH
ATP
Glucose
Chlorophyll
In the electrolysis of molten sodium chloride, which product is formed at the cathode?
Sodium
Chlorine
Hydrogen
Oxygen
What name is given to a reaction in which one substance is simultaneously oxidised and reduced?
Dismutation
Comproportion
Symproportioning
Disproportionate
What substance is formed when copper is oxidised by nitric acid?
Copper(II) nitrate
Copper (I) oxide
Copper(II) oxide
Copper (I) nitrate
What is the oxidation state of chromium in potassium dichromate (K₂Cr₂O₇)?
+6
+3
+4
+7
What is the oxidation state of phosphorus in phosphorus pentachloride (PCl₅)?
+5
+3
+1
-3
Which reaction takes place at the anode during the electrolysis of water?
2H₂O → O₂ + 4H⁺ + 4e-
2H⁺ + 2e- → H₂
O₂ + 4e- → 2O²-
H₂ → 2H⁺ + 2e-
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A Oxidation & Reduction scavenger hunt is a GPS-guided outdoor activity with quiz questions about Oxidation & Reduction, part of the theme Chemistry. You walk a route past various locations and answer fun questions along the way.
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