Properties, Uses & Alloys Of Metals

Learn it by playing

Answer these questions to earn energy, then fish and explore. No account needed.

For teachers: ready-to-use lesson slides, revision notes, diagrams for Properties, Uses & Alloys Of Metals (Chemistry, CIE) — use them in your lesson, or run the topic as a live class game.

Notes

Physical Properties of Metals

Metals are **good conductors of heat and electricity** due to **delocalised electrons** that move through the structure.
Metals are **malleable** (can be hammered into shapes) and **ductile** (can be drawn into wires) because layers of positive ions can slide over each other.
Metals have **high melting and boiling points** because of strong **metallic bonding** (electrostatic attraction between positive ions and delocalised electrons).
Most metals are **solids at room temperature** (except mercury).
Metals are **sonorous** (make a ringing sound when struck).

Chemical Properties of Metals

Metals react with **water** (cold or steam) to produce a metal hydroxide/oxide and hydrogen.
Metals react with **dilute acids** to produce a salt and hydrogen gas.
Metals react with **oxygen** to form metal oxides.
The **reactivity series** ranks metals based on their reactions with water, acid, and oxygen.

Uses of Aluminium

Aluminium is used for **aeroplane bodies** because of its **low density** and **high strength-to-weight ratio**.
Aluminium is used for **overhead power cables** because it is a **good electrical conductor** and has **low density**.
Aluminium is used for **food cans** because it is **non-toxic** and **resistant to corrosion** (forms a protective oxide layer).

Uses of Copper

Copper is used for **electrical wiring** because it is a **very good conductor of electricity** and is **ductile**.
Copper is used for **pots and pans** because it is a **good conductor of heat**, **unreactive**, and **malleable**.
Copper is used for **water pipes** because it is **non-toxic**, **unreactive** with water, and **malleable**.

What is an Alloy?

An **alloy** is a **mixture** of a metal with other elements (often other metals, but may include non-metals).
Alloys are **not compounds**; they are physical mixtures.
Alloys have **different properties** from their constituent metals, often being **stronger**, **harder**, or more **resistant to corrosion**.

Examples of Alloys

**Brass** is an alloy of **copper and zinc**; it is stronger than either metal and used in musical instruments, ornaments, and door knobs.
**Stainless steel** is an alloy of **iron with chromium, nickel, and carbon**; it is hard and resistant to rusting, used in cutlery.
**Iron with tungsten** is extremely hard and resistant to high temperatures.
**Aluminium with copper, manganese, and silicon** is stronger but still low density, ideal for aircraft bodies.

Structure of Alloys (Extended Tier)

Pure metals have a **regular arrangement** of positive ions in layers surrounded by a **sea of delocalised electrons**.
In an alloy, atoms of **different sizes** distort the regular lattice, creating an **irregular arrangement**.
The distortion makes it **harder for layers to slide** over each other, so alloys are generally **harder and stronger** than pure metals.

Particle arrangement in solids, liquids, and gases. Metals are solid at room temperature (except mercury).

Comparison of particle arrangement in a pure metal (regular lattice) and an alloy (irregular due to different-sized atoms).

Practice questions

Free preview — 8 of 40 questions. Sign up to see them all.

1.Which of the following is a physical property of metals?
Easy
- AThey are brittle when solid.
- BThey are good conductors of electricity.
- CThey have low melting points.
- DThey are non-ductile.
2.What is the main reason metals are malleable?
Easy
- AThe atoms are arranged in a regular lattice that can slide.
- BThe delocalised electrons allow layers to slide over each other.
- CThe strong metallic bonds prevent any movement.
- DThe atoms are covalently bonded in a rigid structure.
3.Which property of aluminium makes it suitable for use in overhead power cables?
Medium
- AHigh density and good conductor of electricity.
- BLow density and good conductor of electricity.
- CHigh density and poor conductor of electricity.
- DLow density and poor conductor of electricity.
4.What is an alloy?
Easy
- AA pure metal element.
- BA compound of two metals.
- CA mixture of a metal with other elements.
- DA non-metal combined with oxygen.
5.Which of the following is an alloy of copper and zinc?
Medium
- AStainless steel
- BBronze
- CBrass
- DSolder
6.Why are alloys generally harder than pure metals?
Hard
- AAlloys have a regular arrangement of atoms that is easier to slide.
- BAlloys contain atoms of different sizes that distort the layers, making sliding harder.
- CAlloys have more delocalised electrons than pure metals.
- DAlloys have weaker metallic bonds than pure metals.
7.Which metal is commonly used for electrical wiring due to its high conductivity and ductility?
Easy
- AAluminium
- BCopper
- CIron
- DGold
8.Which of the following is a use of aluminium based on its low density?
Medium
- AFood cans
- BElectrical wiring
- CAeroplane bodies
- DCutlery

More questions

9.Which statement about the structure of an alloy is correct?
Hard
- AIt has a regular arrangement of identical atoms.
- BIt has an irregular arrangement of atoms of different sizes.
- CIt has a regular arrangement of atoms of different sizes.
- DIt has an irregular arrangement of identical atoms.
10.Which property of copper makes it suitable for use in cooking pots?
Easy
- AIt is a poor conductor of heat.
- BIt is a good conductor of heat and unreactive.
- CIt has a low density.
- DIt is very hard.
11.What is the main reason stainless steel is used for cutlery?
Medium
- AIt is lightweight.
- BIt is hard and resistant to corrosion.
- CIt is a good conductor of electricity.
- DIt has a low melting point.
12.Which diagram best represents the structure of an alloy?
Hard
- ARegular rows of identical circles.
- BIrregular rows of circles of different sizes.
- CRandomly scattered individual circles.
- DRegular rows of circles of different sizes.
13.A student reacted equal lengths of magnesium ribbon with excess dilute sulfuric acid of different concentrations. The temperature change was recorded. Which factor is most likely to cause the largest temperature change?
Medium
- AUsing a higher concentration of acid
- BUsing a lower concentration of acid
- CUsing a larger volume of acid
- DUsing a shorter length of magnesium ribbon
14.In the reaction between magnesium and dilute sulfuric acid, what type of reaction occurs?
Medium
- AExothermic
- BEndothermic
- CNeutralisation
- DDecomposition
15.A student used 20 cm³ of sulfuric acid solution A and measured a temperature change of 8°C. If the experiment was repeated using 40 cm³ of the same solution A with the same length of magnesium ribbon, what would be the expected temperature change?
Medium
- A8°C
- B4°C
- C16°C
- D0°C
16.In an experiment, equal masses of magnesium powder were used instead of equal lengths of magnesium ribbon. How would the temperature changes compare?
Hard
- ATemperature changes would be larger with powder
- BTemperature changes would be smaller with powder
- CTemperature changes would be the same
- DTemperature changes would be unpredictable
17.The table shows the initial and highest temperatures for five experiments. Experiment 3 had the largest temperature change. Which is the most likely reason?
Hard
- AIt used the most concentrated acid
- BIt used the longest magnesium ribbon
- CIt had the lowest initial temperature
- DIt had the highest initial temperature
18.Which property of copper makes it suitable for use in electrical wiring?
Easy
- AVery good conductor of electricity and ductile
- BVery good conductor of heat and malleable
- CLow density and resistant to corrosion
- DHigh strength and low reactivity
19.Brass is an alloy of copper and zinc. Which statement about brass is correct?
Medium
- ABrass is stronger than pure copper or zinc
- BBrass is weaker than pure copper or zinc
- CBrass is more ductile than pure copper
- DBrass is more malleable than pure copper
20.Which diagram best represents the structure of an alloy? (Consider the arrangement of atoms)
Medium
- AIrregular arrangement of different-sized atoms
- BRegular arrangement of identical atoms
- CIrregular arrangement of identical atoms
- DRegular arrangement of different-sized atoms
21.Stainless steel is an alloy of iron with chromium and nickel. Why is stainless steel used for cutlery?
Hard
- AIt is hard and resistant to corrosion
- BIt is soft and malleable
- CIt is a good conductor of heat
- DIt has a low density
22.A student investigates the reaction of magnesium with dilute sulfuric acid. Which is a possible source of experimental error?
Hard
- ANot measuring the temperature immediately after adding magnesium
- BUsing a measuring cylinder to measure acid volume
- CStirring the solution
- DUsing excess acid
23.A student investigates the temperature change when equal lengths of magnesium ribbon react with excess dilute sulfuric acid of different concentrations. In Experiment 1, 20 cm³ of solution A is used. The initial temperature is 20.0 °C and the highest temperature is 28.5 °C. What is the temperature change?
Medium
- A8.5 °C
- B48.5 °C
- C20.0 °C
- D28.5 °C
24.In the same investigation, which experiment is expected to produce the largest temperature change?
Medium
- AThe experiment with the most concentrated acid
- BThe experiment with the least concentrated acid
- CThe experiment with the largest volume of acid
- DThe experiment with the smallest length of magnesium
25.If the student repeats Experiment 1 using 40 cm³ of the same sulfuric acid solution A instead of 20 cm³, what would be the effect on the temperature change?
Hard
- AThe temperature change would be the same
- BThe temperature change would be larger
- CThe temperature change would be smaller
- DThe temperature change would be zero
26.If the student uses equal masses of magnesium powder instead of equal lengths of magnesium ribbon, how would the temperature changes compare?
Hard
- AThe temperature changes would be larger
- BThe temperature changes would be smaller
- CThe temperature changes would be the same
- DNo reaction would occur
27.What type of chemical reaction occurs when magnesium reacts with dilute sulfuric acid?
Medium
- AExothermic
- BEndothermic
- CNeutralisation
- DPrecipitation
28.In the investigation, which of the following is a possible source of experimental error?
Hard
- ANot stirring the mixture
- BUsing a measuring cylinder to measure acid
- CUsing magnesium ribbon from the same reel
- DRecording the highest temperature after 5 minutes
29.Why is aluminium used extensively in the manufacture of aeroplanes?
Medium
- AIt has a high strength-to-weight ratio and low density
- BIt is very dense and strong
- CIt is cheap and readily available
- DIt is a good conductor of electricity
30.Why is copper a suitable material for making cooking utensils?
Medium
- AIt is a good conductor of heat and is unreactive
- BIt is a good conductor of electricity and is ductile
- CIt has a low density and is malleable
- DIt is resistant to corrosion and has a high melting point
31.In the reaction between magnesium and dilute sulfuric acid, the temperature change is measured. If equal lengths of magnesium ribbon are used with excess acid of different concentrations, which factor is most likely to affect the temperature change?
Medium
- AThe concentration of the acid
- BThe volume of the acid
- CThe length of the magnesium ribbon
- DThe initial temperature of the acid
32.In an experiment, equal masses of magnesium powder are used instead of equal lengths of magnesium ribbon. How would the temperature changes compare to using ribbon?
Medium
- AThey would be larger because powder has a larger surface area
- BThey would be smaller because powder reacts more slowly
- CThey would be the same because the mass of magnesium is the same
- DThey would be smaller because powder is less reactive
33.A student investigates the temperature change when equal lengths of magnesium ribbon react with excess dilute sulfuric acid. The results are shown in the table. Which experiment likely used the most concentrated acid?
Hard
- AThe one with the largest temperature change
- BThe one with the smallest temperature change
- CThe one with the highest initial temperature
- DThe one with the longest reaction time
34.In the reaction between magnesium and dilute sulfuric acid, if 40 cm³ of acid is used instead of 20 cm³ (same concentration), what is the effect on the temperature change?
Medium
- AThe temperature change is about the same because the same amount of magnesium reacts
- BThe temperature change is larger because more acid is present
- CThe temperature change is smaller because the heat is spread over more volume
- DThe temperature change is zero because the reaction does not occur
35.Which type of chemical reaction occurs when magnesium reacts with dilute sulfuric acid?
Easy
- ANeutralisation
- BDisplacement
- CCombustion
- DOxidation
36.In an experiment to investigate the reaction of magnesium with sulfuric acid, a student uses a thermometer to measure temperature. What is a possible source of experimental error?
Medium
- ANot stirring the mixture
- BUsing a measuring cylinder for the acid
- CUsing magnesium ribbon of the same length
- DRecording the highest temperature reached
37.A student repeats an experiment using magnesium powder instead of ribbon, and uses the same mass. The temperature change is larger. What is the most likely reason?
Hard
- APowder has a larger surface area, so reaction is faster and more heat is released in a shorter time
- BPowder has a smaller surface area, so reaction is slower and heat is lost
- CPowder is more reactive than ribbon
- DPowder reacts with a different mechanism
38.In an experiment, equal lengths of magnesium ribbon are added to 20 cm³ of sulfuric acid of different concentrations. The temperature change is recorded. Which graph best shows the expected relationship between concentration and temperature change?
Hard
- AA positive linear relationship
- BA negative linear relationship
- CNo relationship
- DA curve that increases then levels off
39.A student measures the temperature change when 1 g of magnesium powder reacts with excess sulfuric acid. The experiment is repeated using 2 g of magnesium powder. How does the temperature change compare?
Medium
- AIt is about double
- BIt is about the same
- CIt is half
- DIt is four times
40.In an experiment, 20 cm³ of sulfuric acid at 20°C is reacted with magnesium. The highest temperature reached is 28°C. If the experiment is repeated with the same volume of acid at 30°C, what would be the expected highest temperature?
Hard
- A38°C
- B28°C
- C30°C
- D48°C

Slides

Physical Properties of Metals

Metals are good conductors of heat and electricity because they have delocalised electrons that can move through the structure.
Metals are malleable (can be hammered into shapes) and ductile (can be drawn into wires) because layers of positive ions can slide over each other.
Metals usually have high melting and boiling points due to strong metallic bonding between positive ions and delocalised electrons.

Why are metals good conductors of electricity?

They have delocalised electrons that can move.
They have a giant covalent structure.
They have weak intermolecular forces.
They are brittle.

Uses of Aluminium

Aluminium is used in aeroplane bodies because it has a high strength-to-weight ratio and low density.
Aluminium is used in overhead power cables because it is a good electrical conductor and has low density.
Aluminium is used for food cans because it is non-toxic and resistant to corrosion (forms a protective oxide layer).

Which of these are uses of aluminium?

Aeroplane bodies
Electrical wiring (inside walls)
Overhead power cables
Water pipes

Uses of Copper

Copper is used in electrical wiring because it is a very good conductor of electricity and is ductile.
Copper is used in pots and pans because it is a good conductor of heat, unreactive, and malleable.
Copper is used in water pipes because it is non-toxic, unreactive with water, and malleable.

Which property makes copper suitable for electrical wiring?

Low density
Very good conductor of electricity and ductile
Resistant to corrosion
High melting point

What is an Alloy?

An alloy is a mixture of a metal with other elements (often other metals, but sometimes non-metals).
Alloys are not compounds; they are mixtures.
Examples: brass (copper and zinc), stainless steel (iron with chromium, nickel, and carbon).

An alloy is a ____ of a metal with other elements.

Properties of Alloys

Alloys are often stronger and harder than pure metals.
Alloys can be more resistant to corrosion and extreme temperatures.
These enhanced properties make alloys more useful than pure metals for many applications.

Why are alloys usually harder than pure metals?

They have a regular arrangement of atoms.
The different-sized atoms distort the layers, making it harder for them to slide.
They have delocalised electrons.
They have lower melting points.

Structure of Alloys vs Pure Metals

Pure metals have a regular arrangement of positive ions in layers.
Alloys have an irregular arrangement of atoms due to different-sized atoms.
This irregularity distorts the metal lattice, making alloys harder.

Which statements about alloys are true?

Alloys are mixtures.
Alloys have a regular arrangement of atoms.
Alloys are usually harder than pure metals.
Brass is an alloy of copper and zinc.

Examples of Alloys and Their Uses

Brass (copper + zinc) is used in musical instruments, ornaments, and door knobs.
Stainless steel (iron + chromium, nickel, carbon) is used in cutlery due to hardness and corrosion resistance.
Aluminium alloys (with copper, manganese, silicon) are used in aircraft bodies because they are strong yet low density.

Which alloy is used for cutlery because it is hard and resistant to rusting?

Brass
Stainless steel
Bronze
Aluminium alloy

Metallic Bonding (Extended)

In a metal, positive ions are arranged in a regular lattice surrounded by a 'sea' of delocalised electrons.
The strong electrostatic attraction between positive ions and delocalised electrons is called metallic bonding.
This bonding explains properties like high melting points and electrical conductivity.

In metallic bonding, positive ions are surrounded by a sea of ____ electrons.

Summary of Key Points

Metals conduct electricity, are malleable/ductile, and have high melting points.
Aluminium is used for aircraft and power cables; copper for wiring and pipes.
Alloys are mixtures with distorted structures, making them harder and stronger than pure metals.

Unlock all 40 questions, slides & more

Create a free account to see every question, the slides, flashcards and revision notes for this topic.

Past papers

Past-paper practice for this topic is coming soon.

🗂️ Coming soon