14.2 Alloys

• Chem
• Secondary Education

Lesson 14.3 Alloys

12-09-2022

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REVIEW OF PREVIOUS

 LESSON

• describe an alloy ;
• state the comparison of alloys and pure metals ;
• describe the uses of alloys ;
• identify representations of alloys from diagrams of structure ; and
• explain in terms of structure how alloys can be harder and stronger.

I can...

_____ is mixture of two or more metals or metal with a non-metal such as carbon.

1. noble gas
2. alloy
3. mixture
4. heterogeneous

Which of the following properties DOES NOT describe an alloy?

1. more strength
2. harder than pure metal
3. low resistance to corrosion
4. withstand high temperature

Which is more useful?

1. alloys
2. pure metals

The regular arrangement of a metal ________ structure is distorted in alloys.

1. lattice
2. complex
3. simple
4. crystal

Which of the following alloys is a mixture of copper and zinc?

1. Brass
2. Stainless steel
3. Iron alloys
4. Aluminium alloys

Which of the following alloys is a mixture of iron and other elements like chromium, nickel, and carbon?

1. Brass
2. Stainless steel
3. Iron alloys
4. Aluminium alloys

Which special property of iron + tungsten iron has?

1. resistance to high temperature
2. resistance to high pressure
3. resistance to electricity
4. resistance to corrosion

Which alloy is resistant to corrosion?

1. iron + nickel
2. iron + copper
3. iron + chromium
4. A and C

Which of the following alloys is NOT stronger than other alloys but still has a low density and is used in aircrafts?

1. Al + Cu
2. Al + Mn
3. Al + Si
4. Al + Fe

Alloys are mixture of substances, they are chemically combined and an alloy is NOT a compound.

1. TRUE
2. FALSE

Alloys contain atoms of similar sizes, which distorts the normally regular arrangements of atoms in metals.

1. TRUE
2. FALSE

Cite ONE reason why alloys are stronger and much harder than pure metals. (Focus on particle structure.)

Practice

12-09-2022

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