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Chemical Reactions and Equations Chapter 1 Quiz

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Chemical Reactions and Equations Chapter 1 Quiz

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Questions and Answers

What is one of the examples given in the text where a chemical change occurs?

Leaving milk at room temperature during summers

Burning magnesium ribbon (correct)

Respiring

Cooking food

What is the nature of the initial substance when a chemical change occurs?

It completely changes

It partially changes (correct)

It becomes unrecognizable

It remains the same

What is the purpose of burning magnesium ribbon in the activity described in the text?

To create ash for another experiment

To produce heat

To measure the energy produced

To observe a chemical change (correct)

Which statement best describes the difference between physical and chemical changes?

Physical changes involve a change in chemical composition, while chemical changes do not. (D) Signup and view all the answers

How does the text suggest recognizing when a chemical reaction has taken place?

By observing a change in color or odor (B) Signup and view all the answers

What would be an example of a physical change based on the given text?

Melting ice (B) Signup and view all the answers

What is the chemical name of the white powder formed when magnesium ribbon burns in air?

Magnesium oxide (D) Signup and view all the answers

Which of the following observations helps to determine whether a chemical reaction has taken place?

Change in state (B) Signup and view all the answers

In a word-equation, where are the reactants written?

On the left-hand side with a plus sign between them (C) Signup and view all the answers

What is the chemical equation for the reaction between magnesium and oxygen?

Mg + O → MgO (D) Signup and view all the answers

What can make chemical equations more concise and useful?

Using chemical formulae instead of words (A) Signup and view all the answers

What substance is formed when lead nitrate solution is mixed with potassium iodide solution?

Lead iodide (D) Signup and view all the answers

What is formed by the action of dilute sulphuric acid on zinc?

Hydrogen gas (B) Signup and view all the answers

Which of the following is NOT an observation that helps determine whether a chemical reaction has taken place?

$5(7 + 3)$ (A) Signup and view all the answers

$2 \times 3$

$6$ (A) Signup and view all the answers