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Questions in chemistry

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

[Terjawab] 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.

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

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

[Terjawab] 1. Ag (silver) tarnishes. Is this a physical or chemical property? 2. An apple is cut. Is this a physical or chemical property?

[Terjawab] How is an average mass different from a weighted average mass?

[Terjawab] Why can't color alone be used to identify most minerals?

[Terjawab] Could a mixture be made up of only elements and no compounds?

[Terjawab] As the elements in Period 3 are considered in order of increasing atomic number, there is a general decrease in: - atomic radius There is generally an increase in: - atomic mass - electronegativity - first ionization energy

[Terjawab] Why do copper ions go to the negative electrode?