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Chemical Reactions and Equations: Introduction to Physical and Chemical Changes

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Chemical Reactions and Equations: Introduction to Physical and Chemical Changes

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Questions and Answers

Which observation can help determine a chemical reaction?

Change in pressure

Change in volume

Change in density

Evolution of a gas (correct)

In a physical change, what typically occurs?

Formation of new substances

Evolution of gas

Change in temperature

Change in state but no new substance is formed (correct)

What is an example of a chemical change?

Melting ice

Boiling water

Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s) (correct)

Mixing sugar in water

Which factor is NOT indicative of a chemical reaction?

Change in volume Signup and view all the answers

What is the main difference between chemical and physical changes?

Formation of new substances Signup and view all the answers

Which type of change involves bonds being made or broken between atoms?

Chemical change Signup and view all the answers

What does a word equation help identify in a chemical reaction?

Reactants and products Signup and view all the answers

What does the symbol '(l)' represent in a chemical equation?

Liquids Signup and view all the answers

Which law states that no atoms can be created or destroyed in a chemical reaction?

Law of Conservation of Mass Signup and view all the answers

What is the purpose of balancing a chemical equation?

To ensure the law of conservation of mass is followed Signup and view all the answers

What is the shortcut technique for balancing a chemical equation mentioned in the text?

Simultaneous equations method Signup and view all the answers

In the chemical equation: aCaCO3 + bH3PO4 → cCa3(PO4)2 + dH2CO3, what are the values of a, b, c, and d when c=1?

a=3, b=2, c=1, d=3 Signup and view all the answers