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Questions in chemistry

[Done] What are the components of clean air?

[Done] What reactions are involved in making plastic bags, and what are the molecules that make up a plastic bag like?

[Done] What two particles account for almost all of the mass of an atom?

[Done] How many liters of a 4M solution can be made using 100 grams of lithium bromide?

[Done] A golf ball and a bowling ball are moving and both have the same kinetic energy. Which one is moving faster? If they move at the same speed, which one has more kinetic energy?

[Done] How do you decide whether an observed property of matter is a physical or a chemical property?

[Done] How does one recognize the highest occupied energy level?

[Done] A solution is either an acid or a base and it doesn't react with metal. Is its pH more likely to be 4 or 9? Explain your answer.

[Done] Do all substances have the same melting point and boiling point as water? (Consider using the particle theory to answer this question.)

[Done] Does it react with air? Is this a physical or chemical property?