Science: Substances and Fire Safety Quiz

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Chemistry and fire safety basics.

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Hongo Ochieng

Kenya

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Science: Substances and Fire Safety Quiz


Froggy Jumps Science: Substances and Fire Safety QuizOnline version Chemistry and fire safety basics. by Hongo Ochieng 1 What is meant by a pure substance? a A pure substance is always a compound. b A pure substance contains many different particles. c A pure substance contains only one type of particle. 2 Are elements pure substances? Give a reason. a Yes, because they contain only one type of atom. b No, elements are mixtures. c Yes, because they contain many types of atoms. 3 State one difference between metals and non-metals. a Metals are non-lustrous while non-metals are shiny. b Metals conduct electricity while non-metals do not. c Metals are gases at room temperature while non-metals are solids. 4 Name two metallic elements. a Oxygen and sulfur. b Hydrogen and helium. c Iron and copper. 5 Name two non-metallic elements. a Iron and copper. b Oxygen and sulphur. c Gold and silver. 6 What happens to elements during the formation of compounds? a They dissolve in water. b They mix physically in any ratio. c They chemically combine in fixed proportions. 7 State one property of compounds that is different from the elements that form them. a Compounds have different properties from their elements. b Compounds are always gases. c Compounds have identical properties to their elements. 8 Why is water not an element? a Because it is a mixture of substances. b Because it is a compound formed by metals. c Because it is made of two elements chemically combined. 9 State two examples of naturally occurring compounds. a Iron and copper. b Water and carbon dioxide. c Oxygen and nitrogen. 10 Explain why air is not a compound. a Because air contains only one gas. b Because air is a pure element. c Because its gases are not chemically combined. 11 State one use of oxygen. a It is used in insulation. b It is used to produce plastic. c It is used in respiration. 12 State one use of iron. a As a fertilizer. b As a fuel. c Making tools and buildings. 13 Why is a chemical formula important? a It shows the color of a substance. b It proves the substance is pure. c It shows the elements present in a compound. 14 State the chemical formula of water. a HO2. b H2O. c HHO. 15 Name one compound used in agriculture and state its use. a Fertilizers – to improve soil fertility. b Pesticides – to kill pests. c Water – to hydrate plants. 16 What type of change occurs when water freezes? a Nuclear change. b Physical change. c Chemical change. 17 Is boiling of water a chemical change? Explain. a Yes, it creates steam which is new. b No, because no new substance is formed. c Yes, it changes composition. 18 What change occurs when paper burns? a Chemical change. b No change. c Physical change. 19 State one visible sign of a chemical change. a Change in shape only. b Change in weight only. c Formation of ash or smoke. 20 State one example of an irreversible change. a Cooking food. b Melting ice. c Dissolving sugar in water. 21 Why is rusting harmful to iron structures? a It strengthens the metal. b It weakens the structure. c It makes iron shine. 22 State one way of preventing rusting. a Increasing iron exposure. b Adding more iron. c Painting or oiling. 23 Identify the change involved in dissolving salt in water. a Physical change. b Nuclear change. c Chemical change. 24 What type of change produces energy such as heat or light? a Chemical change. b Physical change. c No change. 25 State two differences between rusting and melting. a Rusting occurs only in air; melting only underwater. b Rusting is faster; melting is slower. c Rusting forms a new substance; melting does not. Rusting is irreversible; melting is reversible. 26 State one importance of chemical changes in daily life. a They help in cooking food. b They are always dangerous. c They have no daily impact. 27 Identify the change when milk turns sour. a Physical change. b Chemical change. c No change. 28 State one effect of chemical changes on the environment. a Can cause pollution. b Has no impact. c Always beneficial. 29 Give one example where heat causes a chemical change. a Dissolving sugar. b Baking bread. c Melting butter. 30 What is fuel in relation to fire? a Any substance that burns. b Only gases burn. c Only solids burn. 31 Which part of the fire triangle provides heat? a Heat source. b Fuel. c Oxygen. 32 Which class of fire involves paper and wood? a Class A fire. b Class B fire. c Class D fire. 33 Which class of fire is caused by petrol? a Class A fire. b Class B fire. c Class C fire. 34 Which class of fire is caused by gas leakage? a Class C fire. b Class A fire. c Class D fire. 35 State one danger of electrical fires. a Electric shock. b Watering plants. c Fewer fires. 36 Why is sand used to put out some fires? a It cuts off oxygen. b It cools the fire. c It fuels the fire. 37 State one example of a Class C fire. a Petrol spill. b Wood burning. c Burning electrical cable. 38 Name one fire extinguisher suitable for electrical fires. a Foam extinguisher. b Water extinguisher. c Carbon dioxide extinguisher. 39 Why should water not be used on petrol fires? a Water extinguishes petrol. b Petrol dissolves in water. c Petrol floats on water and spreads fire. 40 State one safety rule when using electricity at home. a Use metal extensions. b Do not overload sockets. c Leave switches on overnight. 41 State one safety rule when using gas at home. a Turn off gas after use. b Ignore gas smells. c Leave gas on while away. 42 State one way of preventing fire outbreaks in school. a Increase paper use. b Paint walls red. c Proper wiring of buildings. 43 What should be the first action during a fire outbreak? a Hide under desks. b Raise an alarm. c Continue classes. 44 State one role of fire extinguishers. a To put out fires. b To start fires. c To detect fires. 45 Explain how foam extinguishers put out fire. a They absorb water. b They fuel the fire. c They cut off oxygen. 46 State one benefit of learning fire safety. a It wastes time. b It increases risk. c It saves lives. 47 State one effect of uncontrolled fires. a Improved safety. b No impact. c Destruction of property. 48 State one fire safety symbol you know. a No smoking sign. b Fire exit sign. c Stop sign. 49 Give one reason why fire drills are important in schools. a They prepare learners for emergencies. b They waste time. c They test students only.

Science: Substances and Fire Safety Quiz

Froggy Jumps

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Science: Substances and Fire Safety QuizOnline version

by Hongo Ochieng

What is meant by a pure substance?

Are elements pure substances? Give a reason.

State one difference between metals and non-metals.

Name two metallic elements.

Name two non-metallic elements.

What happens to elements during the formation of compounds?

State one property of compounds that is different from the elements that form them.

Why is water not an element?

State two examples of naturally occurring compounds.

Explain why air is not a compound.

State one use of oxygen.

State one use of iron.

Why is a chemical formula important?

State the chemical formula of water.

Name one compound used in agriculture and state its use.

What type of change occurs when water freezes?

Is boiling of water a chemical change? Explain.

What change occurs when paper burns?

State one visible sign of a chemical change.

State one example of an irreversible change.

Why is rusting harmful to iron structures?

State one way of preventing rusting.

Identify the change involved in dissolving salt in water.

What type of change produces energy such as heat or light?

State two differences between rusting and melting.

State one importance of chemical changes in daily life.

Identify the change when milk turns sour.

State one effect of chemical changes on the environment.

Give one example where heat causes a chemical change.

What is fuel in relation to fire?

Which part of the fire triangle provides heat?

Which class of fire involves paper and wood?

Which class of fire is caused by petrol?

Which class of fire is caused by gas leakage?

State one danger of electrical fires.

Why is sand used to put out some fires?

State one example of a Class C fire.

Name one fire extinguisher suitable for electrical fires.

Why should water not be used on petrol fires?

State one safety rule when using electricity at home.

State one safety rule when using gas at home.

State one way of preventing fire outbreaks in school.

What should be the first action during a fire outbreak?

State one role of fire extinguishers.

Explain how foam extinguishers put out fire.

State one benefit of learning fire safety.

State one effect of uncontrolled fires.

State one fire safety symbol you know.

Give one reason why fire drills are important in schools.