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

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sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added