Physical and Chemical Changes Quiz

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Questions and Answers

Which substance is formed when carbon dioxide is passed through lime water?

Water (H2O)
Lime water
Carbon Dioxide (CO2)
Calcium Carbonate (CaCO3) (correct)

What is the standard test for carbon dioxide?

Reacting copper sulphate with iron
Passing it through lime water (correct)
Burning magnesium in air
Mixing vinegar and baking soda

In Activity 5.6, what new substance was formed when magnesium was burnt in air?

Lime water
Water (H2O)
Carbon Dioxide (CO2)
Ash (correct)

What are the new substances formed when copper sulphate reacts with iron?

<p>Iron Sulphate and Copper (A)</p> Signup and view all the answers

What is the new substance formed when vinegar and baking soda react?

<p>Carbon Dioxide (CO2) (B)</p> Signup and view all the answers

Flashcards

What is formed when carbon dioxide reacts with lime water?

Calcium carbonate (CaCO3) is a white, powdery substance formed when carbon dioxide gas is bubbled through lime water (calcium hydroxide solution).

What is the standard test for carbon dioxide?

Passing carbon dioxide gas through lime water (a clear solution of calcium hydroxide) is a standard test to identify the presence of carbon dioxide. The solution turns milky white due to the formation of calcium carbonate.

What is formed when magnesium is burnt in air?

When magnesium is burnt in air, it reacts with oxygen to form a white powdery ash, which is mainly magnesium oxide (MgO).

What are the products of the reaction between copper sulfate and iron?

When copper sulfate solution reacts with iron nails, a displacement reaction occurs. Iron, being more reactive, displaces copper from the solution, forming iron sulfate (dissolved in the solution) and solid copper (deposited on the iron nail).

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What is formed when vinegar and baking soda react?

When vinegar (dilute acetic acid) reacts with baking soda (sodium bicarbonate), carbon dioxide gas is released, along with water and sodium acetate. This reaction is often observed as fizzing or bubbling.

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