Question

select all the correct answers.
which three statements are true about all alloys?
□ theyre made from metals combined in equal amounts.
□ theyre harder than the pure metals theyre made of.
□ theyre good conductors of electricity.
□ theyre brittle and prone to cracking.
□ they have a metal as their main component.

Explanation:

1. Analyze "They’re made from metals combined in equal amounts": Alloys don't require equal amounts of metals; components can be in varying proportions. So this is false.
2. Analyze "They’re harder than the pure metals they’re made of": A key property of alloys is increased hardness compared to their constituent pure metals (e.g., brass vs. copper/zinc). This is true.
3. Analyze "They’re good conductors of electricity": Since alloys contain metals (good conductors), they generally conduct electricity well (e.g., bronze, steel). This is true.
4. Analyze "They’re brittle and prone to cracking": Most alloys are not brittle; they are designed for strength and ductility (e.g., stainless steel is ductile). This is false.
5. Analyze "They have a metal as their main component": By definition, an alloy has a metal (the base metal) as the primary component, with other elements (metals/non - metals) added. This is true.

Answer:

• They’re harder than the pure metals they’re made of.
• They’re good conductors of electricity.
• They have a metal as their main component.