Unit 10
Unit 10
Unit 11
Unit 11
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100
Explain the definition of mixture and give example.
A mixture is made up of two or more substances that make up the mixture.(ex.steel, air, milkshakes.)
100
Is hammering a nail into a piece of wood physical changes or chemical changes.
Physical changes
100
Explain the definition of electrical conductivity.
Electrical conductivity is materials that allow electricity to flow through them.
100
Explain the definition of insulator.
Insulators are poor conductors of heat.
100
If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?
Five minutes.
200
Explain the definition of pure substance and give example.
A pure substance is made up of only one substance.(ex.sugar, salt, aluminium. )
200
What are good things to use fuel cell cars?
Ex.Using fuel cell cars does not cause pollution. Using fuel cell cars does not emit a lot of sound.
200
Explain the definition of density and give examples.
The density of a material is its mass per unit volume. (ex. wood boats, anchor of a ship.)
200
Explain the definition of heat conductivity.
The heat conductivity is materials that allows heat to flow through them quickly.
200
How many religions are there in the world?
10,000 distinct.
300
Explain the definition of chemical changes and give example.
A chemical change results in the formation of new materials. It involves a chemical change reaction. There may be a change in the colour, smell, shape or structure of the material.(ex. burnt paper, backed cake.)
300
What are the fuel cell cars?
Fuel cell cars have a special device called the hydrogen-oxygen fuel cell.
300
Explain the definition of elasticity and give examples.
Elasticity is the ability of a material to be able to return to its original shape after being stretched. (ex. catapult, rubber excercise band.)
300
Explain the definition of strength and give example.
The strength of a materials is its ability to withstand a heavy load without breaking or tearing.(ex.steel bridges.)
300
How are pearls formed?
Ask the teacher.
400
Explain the definition of physical changes and give example.
A physical change is a change only in the appearance of a material. There may be a change in size, shape, of the material. (ex. breaking glass, melting butter.)
400
Explain the definitions of constituents.
Components that objects are made up of.
400
Explain the definition of composite materials.
A new material that is made by combining two or more materials with different properities.
400
Explain the definition of hardness and give examples.
Hardness refers to the ability of a material to withstand wear and scratches. (ex. metal drink can, ceramic teapot.)
400
25.7
500
What are 4 things that causes materials to change?
Heat, light, electricity, mixed.
500
What is mineral water consist of.
Mineral water from natural springs commonly has a high content of calcium carbonate, magnesium sulfate, potassium, and sodium sulfate.
500
What are 7 properties of materials?
Hardness, elasticity, strength, density, degree of transparency, heat conductivity and electrical conductivity.
500
Explain the definition of degree of transparency, transparent, translucent, and opaque.
Degree of transparency refers to the amount of light that can pass through a material.Transparent is a materials allow almost all light to pass through them. Translucent is a material that allow some light to pass through them. Opaque is a material that do not allow light to pass through them.
500
What do Alexander the Great and Winnie the Pooh have in common?
Their middle names.