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Test: Pure substances and mixtures - Year 8 MCQ


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10 Questions MCQ Test - Test: Pure substances and mixtures

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Test: Pure substances and mixtures - Question 1

A pure substance has a melting point which is always .......

Detailed Solution for Test: Pure substances and mixtures - Question 1

For a pure substance, the melting point is always the same across all samples of that substance, as it is a characteristic physical property.

Test: Pure substances and mixtures - Question 2

How would you separate a mixture of iron filings and sulfur?

Detailed Solution for Test: Pure substances and mixtures - Question 2

Iron filings are magnetic, while sulfur is non-magnetic. Using a magnet will attract the iron filings, separating them from the sulfur.

Test: Pure substances and mixtures - Question 3

Which of these substances is a mixture?

Detailed Solution for Test: Pure substances and mixtures - Question 3

Sea water is a mixture containing water, salts, and other dissolved substances. Oxygen is an element, and water and salt (sodium chloride) are compounds, making them pure substances.

Test: Pure substances and mixtures - Question 4

Alloys are mixtures of metals. Which is NOT an alloy?

Detailed Solution for Test: Pure substances and mixtures - Question 4

Brass, bronze, and solder are alloys; chromium is an element.

Test: Pure substances and mixtures - Question 5

The method used to separate coloured dyes in ink is .......

Detailed Solution for Test: Pure substances and mixtures - Question 5

Chromatography is used to separate colored dyes in ink by allowing the components to move at different rates across a medium, such as paper, based on their solubility and attraction to the medium.

Test: Pure substances and mixtures - Question 6

Which of the following is a pure substance?

Detailed Solution for Test: Pure substances and mixtures - Question 6

A pure substance consists of only one type of substance with definite chemical and physical properties. Gold (option C) is an element and hence a pure substance. Options A, B, and D are mixtures: air is a mixture of gases, saltwater is a mixture of salt and water, and salad is a mixture of various ingredients.

Test: Pure substances and mixtures - Question 7

The best description of a mixture is .......

Detailed Solution for Test: Pure substances and mixtures - Question 7

A mixture consists of two or more substances that are physically combined and can often be separated by physical means, unlike compounds, which are chemically bonded.

Test: Pure substances and mixtures - Question 8

Which of the following is not a characteristic of mixtures?

Detailed Solution for Test: Pure substances and mixtures - Question 8

Mixtures are not chemically combined (option D). Their components can be separated by physical means (option A), retain their individual properties (option B), and can be either homogeneous or heterogeneous (option C).

Test: Pure substances and mixtures - Question 9

In a solution made by dissolving a solid in a liquid, the hotter the solvent .......

Detailed Solution for Test: Pure substances and mixtures - Question 9

Higher temperatures increase the kinetic energy of solvent molecules, allowing the soluble solid (solute) to dissolve more quickly in the liquid (solvent).

Test: Pure substances and mixtures - Question 10

Which of the following is a homogeneous mixture?

Detailed Solution for Test: Pure substances and mixtures - Question 10

A homogeneous mixture has a uniform composition throughout. Orange juice (option A), when well-mixed or pulp-free, is a homogeneous mixture of water, sugars, acids, and other components. Pizza (option B), granite (option C), and trail mix (option D) are heterogeneous mixtures with visibly distinct components.

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