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Type your answer in the box. All work must be shown for mathematical based problems. For the mathematical problems: Do not round between steps. Round your final answers to 3 significant figures. All answers must have units if needed. Partial credit may be given if work is shown. Some questions will require conversion factors. Please refer to Periodic Table handout. If the density of a cube of Iron (Fe) is 0.459g/cm3 with a mass of 0.0355 Kg, what is the volume of the cube in cm3?

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Isotopes are formed when A) atoms of the same element have the same number of neutronsB) atoms of the same element have the different number of protons           C) atoms of the same element have the same number of electronsD) atoms of the same element have a different number of neutronsE) none of the above

Ions are formed when atoms  A) gain or lose electrons          B) gain or lose protons         C) gain or lose neutrons    D) None of these 

A Compound is _____.A)     a pure substance that can be broken down into simpler substances by a chemical change. B)      a substance that is composed of two or more types of matter that can be separated by physical changes.C)      a pure substance that cannot be broken down into simpler substances by chemical changes.D)     a mixture that can be broken down into simpler substances by physical changes.

What is the common charge for an element in group 1A when they react to form a compound with another element?

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The empirical formula for CH2O is C6H12O6