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Judge the followig statements as true or false. If you believe a statement to be false, provide a corrected version. (a) Air and water are both elements.

(b) All mixtures contain at least one element and one compound.

(c) Compounds can be decomposed into two or more other substances; elements cannot.

(d) Elements can exist in any of the three states of matter.

(e) When yellow stains in a kitchen sink are treated with bleach water, the disappearance of the stains is due to a physical change.

(f) A hypothesis is more weakly supported by experimental evidence than a theory.

(g) The number 0.0033 has more significant figures than 0.033.

(h) Conversion factors used in converting units always have a numerical value of one.

(i) Compounds always contain at least two different elements.

State the law of conservation of energy in a complete sentence.