Chemical Changes in Daily Life

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Questions and Answers

What is the primary purpose of adding acid to zinc granules in Activity 1.3?

To catalyze the reaction

To observe the change in temperature (correct)

To handle the acid with care

To precipitate zinc oxide

What is the product formed when magnesium ribbon is burnt in oxygen?

Magnesium sulfate

Magnesium nitrate

Magnesium oxide (correct)

Magnesium hydroxide

What is the direction of the arrowhead in a word-equation?

Towards the products (correct)

Towards the reactants

Perpendicular to the reactants and products

Away from the reactants

What is the reactant that undergoes chemical change in the reaction mentioned in Activity 1.1?

Magnesium and oxygen Signup and view all the answers

What is the purpose of writing a chemical equation in a shorter form?

To make it more concise and useful Signup and view all the answers

What is the result of the reaction between magnesium and oxygen?

Formation of magnesium oxide Signup and view all the answers

What is the significance of the plus sign (+) in a word-equation?

It separates the reactants and products with a plus sign Signup and view all the answers

What is the term used to describe the new substance formed during a chemical reaction?

Product Signup and view all the answers

What is the primary purpose of Activity 1.1?

To demonstrate a chemical reaction Signup and view all the answers

What is the characteristic of a chemical reaction, as observed in the activities?

Change in state Signup and view all the answers

What is the outcome of burning a magnesium ribbon in air, as observed in Activity 1.1?

Formation of magnesium oxide Signup and view all the answers

What is the purpose of using sandpaper in Activity 1.1?

To clean the magnesium ribbon Signup and view all the answers

Which of the following is NOT a characteristic of a chemical reaction?

Change in shape Signup and view all the answers

What is the purpose of wearing eye protection in Activity 1.1?

To avoid any potential harm from the reaction Signup and view all the answers

What is the outcome of the action of dilute sulphuric acid on zinc, as observed in Activity 1.2?

Formation of hydrogen gas Signup and view all the answers

What is the quote 'Facts are not science — as the dictionary is not literature' implying?

Facts are a part of science, but not the whole of science Signup and view all the answers

Study Notes

Chemical Changes and Reactions

Daily life situations like leaving milk at room temperature, exposing iron to humid air, fermenting grapes, cooking, and digestion all involve changes in the nature and identity of the initial substance.

Chemical Reactions

A chemical reaction occurs when a chemical change takes place.
Ways to determine if a chemical reaction has occurred:
- Change in state
- Change in color
- Evolution of a gas
- Change in temperature
Chemical reactions are happening around us, and there is a large variety of them.

Chemical Equations

A chemical equation is a concise way to represent a chemical reaction using symbols.
A word-equation is a simple way to describe a chemical reaction in sentence form.
The word-equation for the reaction of magnesium and oxygen is: Magnesium + Oxygen → Magnesium oxide
Reactants (magnesium and oxygen) are written on the left-hand side (LHS) with a plus sign (+) between them.
Products (magnesium oxide) are written on the right-hand side (RHS) with a plus sign (+) between them.
The arrowhead points towards the products, showing the direction of the reaction.

Representing Chemical Equations

Chemical equations can be made more concise and useful by using chemical formulae instead of words.
A chemical equation represents a chemical reaction, and can be written in a concise and symbolic form.

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Description

This quiz explores the chemical changes that occur in everyday situations, such as when milk is left at room temperature, an iron object is exposed to humidity, and food is cooked or digested.