U2 - Building materials

Question 1

Def: Insulator

Answer 1

a material that prevents the loss or penetration of heat

Question 2

Properties of concrete

Answer 2

hard
high compressive strength due to ionic bonds

Question 3

Properties of wood

Answer 3

strong
flexible
high compressive strength due to covalent + electrostatic bonds

Question 4

Properties of metal (galvanized iron)

Answer 4

strong
hard
malleable
good conductor
high melting point due to metallic bonds
waterproof

Question 5

Properties of thatch (grass)

Answer 5

weak
not hard
good insulator
flexable

Question 6

Properties of glass

Answer 6

hard
breaks easily
weak
insulator
transparent

Question 7

Uses for concrete

Answer 7

bricks used for walls and foundations of buildings

Question 8

Uses for wood

Answer 8

roof structure
walls
window frames
floors

Question 9

Uses for metal

Answer 9

roofing
walls
window frames

Question 10

uses for thatch

Answer 10

roofs

Question 11

Uses for glass

Answer 11

window panes

Question 12

What is concrete made from

Answer 12

made by mixing together varying quantities of aggregate, cement and water

Question 13

Def: Aggregate

Answer 13

sand, gravel, crushed stone and sometimes pieces of recycled concrete.

Question 14

Why is concrete versatile

Answer 14

because it can be poured or molded into any shape.

Question 15

With what is concrete reinforced with

Answer 15

steel rods or mesh.

Question 16

How is concrete made

Answer 16

by adding sand,gravel, water and cement together. interlocking crystals in the cement is formed when water is added and makes the concrete hard and strong. its then left to slowly dry out making it stronger

Question 17

How is cement made

Answer 17

Made by heating limestone with clay in a gas-fired furnace and the result will be a mixture of calcium silicate and aluminium silicate. interlocking crystals form when water is added to the dry cement powder