Science Metal.

Question 1

Properties of metal- high electricity and thermal conductitivy

Answer 1

Metals are excellent conductors of electricity and heat. This is due to the presence of free-moving electrons in their structure

Question 2

Properties of metal - Luster

Answer 2

Means it is shiny and reflective

Question 3

Properties in metal -Malleability and Ductility

Answer 3

Metals can be hammered into sheets or stretched into wires without breaking. This is because their atoms can slide past each other easily without breaking the structure.

Question 4

Properties in metal- high density

Answer 4

Most metals are relatively dense, meaning they have a high mass per unit volume. This is because metal atoms are closely packed together

Question 5

Properties in metal - High melting and boiling points

Answer 5

Metals generally have high melting and boiling points due to the strong bonds between atoms in the metallic structure, requiring considerable energy to break.

Question 6

Properties in metal- Hardness and Strength

Answer 6

Many metals are strong and hard, resisting deformation. This depends on the type of metal and its alloy

Question 7

Properties of metal- Sonorous

Answer 7

Metals often produce a ringing sound when struck, which is why they are used in making bells and musical instruments. This property is called sonority.

Question 8

Metals and their uses- iron

Answer 8

Iron: Used in construction (steel), tools, vehicles, and machinery due to its strength and durability.

Question 9

Metals and their uses- Copper

Answer 9

Copper- Essential for electrical wiring and plumbing because it conducts electricity and resists corrosion.

Question 10

Metals and their uses-aluminium

Answer 10

Lightweight and resistant to corrosion , aluminum is often used in aircraft, automobiles, packaging (like cans)

Question 11

Metal and theyre properties-silver

Answer 11

Silver: With the highest electrical conductivity of all metals, silver is used in electronics, solar panels, jewelry,

Question 12

Metals and its properties- zinc

Answer 12

Zinc: Often used in galvanizing (coating iron or steel to prevent rust), zinc is also an essential component in batteries

Question 13

Define and know how to measure the density of an object

Answer 13

m is the mass of the object (in grams or kilograms),
• V is the volume of the object (in cubic centimeters, cubic meters, etc.).
Mass over volume.

Question 14

Compound?

Answer 14

A compound is a substance formed when two or more elements chemically bond together in a fixed ratio.

Compounds have unique properties that are different from the elements that make them up. For example, water (H₂O) is a compound made from hydrogen and oxygen.

Salt (sodium chloride, NaCl), where sodium and chlorine are chemically bonded.

Question 15

Compound?

Answer 15

A compound is a substance formed when two or more elements chemically bond together in a fixed ratio.

Compounds have unique properties that are different from the elements that make them up. For example, water (H₂O) is a compound made from hydrogen and oxygen.

Salt (sodium chloride, NaCl), where sodium and chlorine are chemically bonded.

Question 16

Mixture

Answer 16

A mixture is a combitation of two or more stubstances that are physically blended but not chemically bonded.
Mixtures can often be seperated into their physical means. An example is air (a mixture of gases like nitrogen and oyxen and carbon dioxide)

Question 17

Alloy

Answer 17

An alloy is a specific type of mixture where two or metals are combinded to create a material. Alloys often have improved strength and durabiling or resistance to corrosion compared to the individual metals
Alloys can be seperated into their components through chemical processes,
Example: steel is an ally of iron and carbon.

Question 18

Explain how the composition of an alloy affects properties such as hardness and melting point.

Answer 18

An alloy’s composition affects its hardness, melting point, and resistance to corrosion. Added elements can strengthen the metal, adjust melting temperatures, and make it more durable or flexible for specific uses.

Question 19

Distinguish between the terms corrosion and rusting.

Answer 19

Corrosion is the breakdown of metals from environmental reactions, while rusting is a specific type of corrosion that happens only to iron when it reacts with moisture and oxygen. All rusting is corrosion, but not all corrosion is rusting.

Question 20

Justify how different methods of protecting metals from corrosion work

Answer 20

Coating- applying a protective layer prevents direct contaxt between the metal and corrosive elements

Galvanization- this involves coating steel or iron with a layer of sink it corrodes instead of the under lying metal protecting it from rusting

Alloying- mixing metals with elements that are more resistant to corrosion (stainless steals) improves durability.

Question 21

Justify how different methods of protecting metals from corrosion work

Answer 21

Coating- applying a protective layer prevents direct contaxt between the metal and corrosive elements

Galvanization- this involves coating steel or iron with a layer of sink it corrodes instead of the under lying metal protecting it from rusting

Alloying- mixing metals with elements that are more resistant to corrosion (stainless steals) improves durability.

Question 22

Word equations for the reactions of different metals with oxygen

Answer 22

Magnesium + Oxygen → Magnesium
Iron + Oxygen → Iron Oxide
Aluminum + Oxygen → Aluminum Oxide
Zinc + Oxygen → Zinc Oxide
Copper + Oxygen → Copper Oxide
Calcium + Oxygen → Calcium Oxide