T3_W4_Science_6I1

What is an alloy?

• A pure metal

• A mixture of metals

• A non-metal gas

Why can’t you use tin for nails?

• It is too soft.

• It is too expensive.

• It conducts electricity.

What elements make bronze?

• Tin and lead

• Tin and copper

• Iron and carbon

What elements make steel?

• Tin and lead

• Tin and copper

• Iron and carbon

Why are alloys often harder than pure metals?

• The layers of atoms cannot slide over each other

• Atoms in an alloy are the same size

• The atoms are arranged in neat columns and rows

The melting point of solder is ………… tin and lead?

• Higher than

• The same as

• Lower than

What is the test for hydrogen gas?

• Bubble through limewater, turns it cloudy

• Relights a glowing splint

• Goes pop when a lit splint is put into gas

Calcium reacts with sulfuric acid. What salt I made??

• Calcium sulfate

• Calcium sulphide

• Calcium nitrate

In pure metals, the atoms are the same ​ (a)   . When a force is applied they ​ (b)   over each other easily (soft metal).

In an alloy, the atoms are a ​ (c)   size. This ​ (d)   the structure so metals cannot easily slide over each other.

• size
• slide
• different
• distorts