Grade 8: Mixtures, Elements & Changes

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Test your knowledge on mixtures, elements, compounds and fire classes.

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Elisha Hongo Ochieng

Kenya

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Grade 8: Mixtures, Elements & Changes


Froggy Jumps Grade 8: Mixtures, Elements & ChangesOnline version Test your knowledge on mixtures, elements, compounds and fire classes. by Elisha Hongo Ochieng 1 Which is a pure substance that cannot be separated into simpler substances? a Mixture b Compound c Element 2 Water (H2O) is an example of a: a Mixture b Compound c Element 3 A solution like salt in water is a: a Heterogeneous mixture b Homogeneous mixture c Element 4 Boiling an egg is an example of which type of change? a Mixture formation b Chemical change c Physical change 5 Which is a physical change? a baking bread b Melting ice c Rusting iron 6 The process of separating a mixture by evaporation relies on: a Different boiling points b Solubility only c Color differences 7 Class A fires involve which materials? a Electrical equipment b Ordinary combustibles c Metals 8 Class B fires are caused by: a Electrical fires b Flammable liquids c Wood fires 9 Class C fires involve: a Metals b Electrical equipment c Paper products 10 Which statement best describes an alloy? a A solvent and solute only b A mixture of two or more elements, usually metals c A pure element 11 What is an element? a A compound formed by two elements b An element is a pure substance made up of only one type of atom and cannot be broken down chemically c A mixture of substances 12 State two characteristics of elements. a They are always liquids. They are always man-made. b They contain multiple types of atoms. They can be broken down chemically. c They contain only one type of atom. They cannot be broken down into simpler substances by chemical m 13 Give three examples of elements. a Water, salt, sugar. b Oxygen, iron, carbon. c Hydrogen peroxide, ammonia, methane. 14 What is a compound? a A single element in liquid form. b A mixture of elements not chemically bonded. c A compound is a substance formed when two or more elements chemically combine in fixed proportions. 15 State two differences between an element and a compound. a An element has one type of atom while a compound has two or more. Elements cannot be broken down che b An element is always man-made; a compound is natural. c An element is always a gas; a compound is a solid. 16 Which elements make up water? a Hydrogen and nitrogen. b Hydrogen and oxygen. c Oxygen and carbon. 17 Why is sodium chloride classified as a compound? a Because it is made of sodium and chlorine chemically combined. b Because it is a mixture of solids. c Because it contains only one element. 18 Distinguish between a compound and a mixture. a A compound is chemically combined, while a mixture is physically combined. b A compound is a single element; a mixture is multiple elements. c A compound is a gas; a mixture is a liquid. 19 State two methods used to separate mixtures. a Filtration and evaporation. b Distillation and crystallization. c Fermentation and decanting. 20 Give two compounds used at home and their uses. a Hydrochloric acid – flavoring; Ammonia – coloring. b Water – drinking and cooking; Salt – food seasoning and preservation c Alcohol – cleaning; Vinegar – fuel. 21 Why can elements not be broken down by chemical means? a Because they are always in pure form. b Because they are the simplest substances made of one type of atom. c Because they are mixtures of atoms. 22 Classify the following as element or compound: a) Oxygen b) Carbon dioxide a a) Mixture b) Element b a) Compound b) Element c a) Element b) Compound 23 State two sources of elements in nature. a Sunlight and wind. b Air and minerals in the earth. c Water and soil. 24 State one importance of compounds in daily life. a Compounds never react chemicals. b Compounds are used in food, medicine, and cleaning products. c Compounds are rare in nature. 25 Give one example of elements combining to form a compound and its use. a Hydrogen and oxygen form water, which is used for drinking. b Helium and neon form air, used for breathing. c Carbon and nitrogen form sugar, used for energy. 26 What is a physical change? a A change where a new substance is formed. b A physical change is a change where no new substance is formed. c A change that always releases energy. 27 Give two examples of physical changes. a Cooking an egg and burning wood. b Rusting iron and burning charcoal. c Melting ice and dissolving sugar in water. 28 State two characteristics of physical changes. a A new substance is formed. The change is irreversible. b The change is always exothermic. c No new substance is formed. The change is usually reversible. 29 What is a chemical change? a A change where no new substance is formed. b A chemical change is a change where a new substance is formed. c A change that only changes color. 30 Give two examples of chemical changes. a Dissolving salt in water and evaporating water. b Rusting of iron and burning charcoal. c Melting ice and dissolving sugar. 31 State two characteristics of chemical changes. a The change is always physical. b No new substance is formed. The change is reversible. c A new substance is formed. The change is usually irreversible. 32 Why is melting of ice a physical change? a Because a new substance is formed. b Because ice becomes gas. c Because water is still the same substance after melting. 33 Why is burning of charcoal a chemical change? a Because it only changes state. b Because it is reversible. c Because new substances such as ash and gases are formed.

Grade 8: Mixtures, Elements & Changes

Froggy Jumps

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Grade 8: Mixtures, Elements & ChangesOnline version

by Elisha Hongo Ochieng

Which is a pure substance that cannot be separated into simpler substances?

Water (H2O) is an example of a:

A solution like salt in water is a:

Boiling an egg is an example of which type of change?

Which is a physical change?

The process of separating a mixture by evaporation relies on:

Class A fires involve which materials?

Class B fires are caused by:

Class C fires involve:

Which statement best describes an alloy?

What is an element?

State two characteristics of elements.

Give three examples of elements.

What is a compound?

State two differences between an element and a compound.

Which elements make up water?

Why is sodium chloride classified as a compound?

Distinguish between a compound and a mixture.

State two methods used to separate mixtures.

Give two compounds used at home and their uses.

Why can elements not be broken down by chemical means?

Classify the following as element or compound: a) Oxygen b) Carbon dioxide

State two sources of elements in nature.

State one importance of compounds in daily life.

Give one example of elements combining to form a compound and its use.

What is a physical change?

Give two examples of physical changes.

State two characteristics of physical changes.

What is a chemical change?

Give two examples of chemical changes.

State two characteristics of chemical changes.

Why is melting of ice a physical change?

Why is burning of charcoal a chemical change?