Metals and Non Metals, Alloys and Acids Alkalis

Which of the following properties is most commonly associated with metals?

• • Brittle

• • Poor conductor of electricity

• • Malleable

• • Dull

Why are alloys often preferred over pure metals for everyday objects?

• • Alloys often have improved properties, such as being stronger and more resistant to corrosion.

• • Alloys are always lighter than pure metals.

• • Alloys are cheaper to produce.

• • Alloys have lower melting points than pure metals.

What pH range is considered slightly basic and suitable for swimming pools?

• • 0-6

• • 6-7

• • 8-14

• • 7.2-7.8

Which property of metals makes them suitable for use in electrical wiring?

• • They are ductile.

• • They are brittle.

• • They have low melting points.

• • They are insulating.

6. Why are pure metals usually easy to shape, while alloys are harder?

• Pure metals have particles arranged randomly, which makes them easy to bend. Alloys have particles in straight lines, making them harder.

• Pure metals have same-sized particles in layers that slide over each other, making them easy to shape. Alloys have different-sized particles that make sliding harder, so they are stronger.

• Pure metals have weaker bonds, so they are easier to shape. Alloys have stronger bonds, making them harder.

• Pure metals have both large and small particles, so they are easy to bend. Alloys only have small particles, making them harder to shape.

Which of the following pH values indicates a strongly acidic solution?

• 3

• 7

• 8

• 12

Which statement about the melting points of metals and non-metals is correct?

• Metals have low melting points, while non-metals have high melting points.

• Most metals have high melting points, while non-metals have low melting points.

• All metals are gases at room temperature, while non-metals are solids.

• Metals and non-metals have the same melting points.

What property of non-metals makes them useful as insulators?

• • They are brittle.

• • They conduct electricity.

• • They are good conductors of heat.

• • They do not conduct electricity well.

Explain how the pH of a substance can affect its uses or safety in everyday life.

Why do you think alloys are often used in place of pure metals for making objects like coins, jewelry, and airplane parts?