Chemical Reactions Observations
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Questions and Answers

What are the two observations when iron is added to aqueous copper sulfate?

The blue solution turns green, and a reddish-brown deposit of copper is formed.

When lead nitrate is strongly heated, what three products are formed?

Light yellow lead monoxide, reddish-brown nitrogen dioxide, and colorless oxygen gas.

What is the observation when hydrogen sulfide gas is passed through aqueous copper sulfate?

The blue solution becomes colorless and a black precipitate of copper sulfide is formed.

What gas is produced when zinc is added to dilute sulfuric acid and how is it identified?

<p>Hydrogen gas is produced, and it is identified by extinguishing a burning splinter with a 'pop' sound.</p> Signup and view all the answers

Describe the observation when potassium chlorate is heated.

<p>A colorless, odorless gas is produced, which reignites a glowing splinter.</p> Signup and view all the answers

What is the observation when mercuric oxide is heated?

<p>It decomposes into carbon mercury and a colorless, odorless gas is released which reignites a glowing splinter.</p> Signup and view all the answers

What two products are formed when hydrogen sulfide gas reacts with chlorine gas?

<p>Sulfur and hydrogen chloride are produced.</p> Signup and view all the answers

What happens when calcium carbonate is heated, and what gas is released when tested with lime water?

<p>A colorless, odorless gas which turns lime water milky is released. This gas is carbon dioxide.</p> Signup and view all the answers

Study Notes

Chemical Reactions - Observations

  • Zinc + Dilute Sulphuric Acid: A colourless, odourless gas is produced, extinguishing a burning splinter with a "pop" sound.

  • Zinc + Dilute Hydrochloric Acid: A colourless, odourless gas is produced, extinguishing a burning splinter with a "pop" sound (hydrogen).

  • Potassium Chlorate Heated: A colourless, odourless gas is produced that reignites a glowing splint (oxygen).

  • Sodium Sulphate + Dilute Hydrochloric Acid: A colourless gas with a suffocating, burning sulphur odour is released.

  • Iron + Aqueous Copper Sulphate: The blue solution turns green, accompanied by a reddish-brown copper deposit.

  • Hydrogen Sulphide + Aqueous Copper Sulphate: The blue solution becomes colourless and a black copper sulphide precipitate is formed.

  • Lead Nitrate Heated: When strongly heated, it decomposes to light yellow solid lead monoxide, reddish-brown nitrogen dioxide, and colourless oxygen gas.

  • Silver Nitrate + Sodium Chloride: A white precipitate of silver chloride is formed.

  • Silver Nitrate + Dilute Hydrochloric Acid: A white precipitate of silver chloride is formed.

  • Ferrous Sulphate + Sodium Hydroxide: A dirty green precipitate of ferrous hydroxide is produced.

  • Barium Chloride + Sulphuric Acid: A white precipitate of barium sulphate is formed.

  • Barium Chloride + Aqueous Sodium Sulphate: A white precipitate of barium sulphate is produced

  • Hydrogen Sulphide + Chlorine Gas: Sulphur and hydrogen chloride are obtained.

  • Ammonia + Hydrogen Chloride: Dense white fumes of ammonium chloride form.

  • Sodium/Potassium + Water: An explosive reaction occurs, producing a gas which extinguishes a burning splint with a "pop" sound.

  • Iron + Sulphur: Ferrous iron sulphide, a black solid, is created.

  • Mercuric Oxide Heated: Decomposition yields mercury and a colourless, odourless gas that reignites a glowing splint (oxygen).

  • Potassium Nitrate Heated: A colourless, odourless gas that reignites a glowing splint is produced (oxygen).

  • Calcium Carbonate Heated: A colourless odourless gas releases, turning limewater milky (carbon dioxide).

  • Copper Hydroxide Heated: The blue solid changes to black copper oxide.

  • Copper Carbonate Heated: A greenish-blue solid turns black copper oxide. A colourless, odourless gas is produced, turning limewater milky (carbon dioxide)

  • Hydrogen Peroxide Heated: A colourless, odourless gas that reignites a glowing splint is evolved (oxygen).

  • Zinc + Aqueous Copper Sulphate: The blue solution turns colourless, with a reddish-brown copper deposit.

  • Copper Sulphate + Sodium Hydroxide: A blue precipitate of copper hydroxide is formed.

  • Lead Nitrate + Ammonium Hydroxide: A white precipitate of lead hydroxide is formed.

  • Calcium Chloride + Sodium Hydroxide: A white precipitate of calcium hydroxide is formed.

  • Copper + Silver Nitrate: The colourless solution turns blue, with a deposit of silver.

  • Copper Sulphate Crystals Heated: Blue crystalline salt changes to white powder.

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Chemical Reactions PDF - Observations

Description

Explore the fascinating world of chemical reactions through this quiz. You'll learn about the observations and outcomes of various reactions involving zinc, potassium chlorate, and more. Test your knowledge on gas production, color changes, and precipitate formation in these reactions.

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