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WorksheetsCHEMICAL CHANGES
Total questions: 20
Worksheet time: 16mins
Which of the following substances will react with hydrochloric acid to produce hydrogen gas?
calcium carbonate
sodium hydroxide
zinc oxide
calcium
Which reaction does NOT produce carbon dioxide gas?
Burning of fuel
Thermal decomposition of zinc carbonate
Reaction of calcium hydroxide and hydrochloric acid
Respiration
Which of the following is NOT a product formed when sulfuric acid reacts magnesium carbonate?
magnesium sulfate
hydrogen gas
water
carbon dioxide
The salt calcium nitrate is formed when two colourless solutions are mixed. What are the two possible solutions?
calcium + sodium nitrate
nitric acid + calcium hydroxide
potassium nitrate + hydrochloric acid
nitric acid + calcium sulfate
A sweet contains citric acid and some chemicals. When the sweet is put into your mouth, it mixes with the water and fizzes, producing a gas. Which of the following can be found in the sweet?
sodium carbonate
ammonium sulfate
sodium oxide
sodium hydroxide
A conical flask contains sodium hydroxide and methyl orange indicator. Hydrochloric acid is added to the conical flask drop by drop until there is excess acid. What is the expected colour change?
red to orange
yellow to orange
red to yellow
yellow to red
Which of the following is NOT an example of neutralisation in our daily lives?
Using a plastic container instead of a metal container to hold vinegar (ethanoic acid)
Washing our hair with conditioner(acidic) to reduce the effects of shampoo(alkaline) on our hair
Using vinegar (acidic) to clean a sting by a wasp (alkaline)
Brushing our teeth with toothpaste(alkaline)
What is the test for hydrogen gas?
It extinguishes a glowing splint with a pop sound.
It extinguishes a lighted splint with a pop sound.
It gives a white precipitate in limewater.
It produces effervescence in acid.
