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Practice Paper

Prepared by: learnloophq@gmail.com

Last edited 25 days ago by Learn LoopHQ.

Answer key

Chapter: 03. Elements And Compounds

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Chapter 3: Elements and Compounds - Practice Exam

Student Name: _________________________ Date: _________________________ Total Marks: 50

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Part A: Multiple Choice Questions (8 Marks)

Choose the best answer for each question.

Which of the following is an example of a pure substance? a) Soil b) Air c) Sugar d) Saltwater

What is the smallest unit of an element called? a) Molecule b) Compound c) Atom d) Mixture

Which metal is a liquid at room temperature? a) Iron b) Copper c) Mercury d) Aluminium

Which non-metal is known for being very hard and used to cut glass? a) Sulphur b) Carbon (as diamond) c) Oxygen d) Nitrogen

Elements that show properties of both metals and non-metals are called: a) Noble gases b) Metalloids c) Alloys d) Mixtures

What is the main purpose of filling argon or neon in electric bulbs? a) To make them brighter b) To make them stronger c) To prevent the filament from reacting d) To make them cheaper

How many atoms of oxygen are in one molecule of ozone (O_3)? a) 1 b) 2 c) 3 d) 4

Which of the following describes a compound? a) Two or more substances physically mixed b) Made of only one type of atom c) Elements chemically combined in a fixed proportion d) Can be easily separated by filtering

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Part B: Fill in the Blanks (8 Marks)

Complete the following sentences with the correct word(s).

A substance that contains two or more pure substances physically mixed is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

Pure substances have _ _ _ _ _ _ _ _ _ _ _ _ _ _ melting and boiling points.

Metals can be drawn into thin wires, meaning they are _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

_ _ _ _ _ _ _ _ _ _ _ _ _ _ is the most abundant element in the atmosphere.

The abbreviation used to denote an element is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

The smallest unit of a compound that exhibits all its properties is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

A molecule containing four atoms is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _ molecule.

The chemical formula for carbon dioxide is _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

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Part C: True/False Questions (6 Marks)

State whether each statement is True or False.

Particles of soil are similar in color, shape, and size.

Sodium is a soft metal that can be cut with a knife.

Non-metals are generally good conductors of heat and electricity.

Iron is present in chlorophyll pigment in plants.

John Dalton was the first scientist to use systematic symbols to represent elements.

During the formation of a compound, energy is always released.

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Part D: Explanations of Terms (6 Marks)

Explain the following terms in one or two sentences.

Malleability:

Atomicity:

Noble Gases:

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Part E: Identifying and Differentiate Concepts (6 Marks)

Answer the following questions clearly.

Differentiate between homogeneous and heterogeneous substances.

How are elements different from compounds? (Give two differences)

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Part F: Short Answer Questions (10 Marks)

Answer the following questions in 2-3 sentences.

Why is water considered a pure substance, and what happens to its boiling point if sugar is mixed in it?

Give two reasons why gold is suitable for making jewellery.

How are modern symbols for elements derived from their English names? Give an example for each rule.

Describe two ways in which the properties of a compound differ from its constituent elements.

What is the importance of a chemical formula?

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Part G: Diagram-Based Question (6 Marks)

Observe the picture below and answer the questions.

The image shows a common instrument for measuring temperature.

{

"image_description": "A glass thermometer displaying a temperature reading between 37 and 38 degrees Celsius, with the column slightly above the 37 mark. The scale ranges from 35 to 42 degrees Celsius.",

"style": "simple, clear, close-up",

"elements_to_include": [

"Glass thermometer with a bulb at the bottom",

"A silvery liquid column indicating a temperature reading",

"Celsius scale markings (e.g., 35, 36, 37, 38, 39, 40, 41, 42)",

"Small text 'degrees Celsius' or '°C'"

"keywords_for_ai_generator": [

"clinical thermometer",

"mercury thermometer",

"temperature measurement",

"science instrument",

"laboratory equipment",

"healthcare tool"

]

}

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Name the substance filled inside this instrument.

Is this substance a metal or non-metal?

Why is this particular substance chosen for this instrument, considering its properties?

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