1. List two differences between, elements, molecules, and compounds. Give an example of each.

2. List 4 polyatomic ions and combine them with the ion Fe³⁺, give the formula and compound name for each.

3. Discuss the solubility rule. Give two examples of ions that make a compound soluble and insoluble.

4. Balance the following equations. Solve for the mass of Fe₍ₛ₎ produced in equation a. if 116g of Fe₂O₃ react.
a. Fe₂O₃(s) + C(s)  Fe(s) + CO₂(g)

    b. Al(s) + FeO(s)  Fe(s) + Al₂O₃(s)

    c. Al(s) + H₂SO₄(aq)  Al₂(SO₄)₃(aq) +    H₂(g)

5. What is atmospheric pressure and how does a barometer tell the weather?

6. Name three antacids and give their formula.

7. List three properties of organic and inorganic molecules. Give two examples of each and their names.

8. What is the IUPAC name for these compounds. (for these pictures, see Questions.docx)

9. What is the difference between hemiacetal and acetal compounds and how are cyclic hemiacetals important in sugar formation?

10. Name two proteins important in enzymatic functions. Give the names and their function.

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A chemical element (simple substance, elementary substance) is a substance that consists of only one kind of atomic sort, it has all the atoms of the same atomic number of PTE. From all the substances available in nature, approximately 20 are available as chemical elements.
Those are N2, O2, H2, He, Ne, Ar, Kr, Xe, Rn, Hg, C, S, Cu, Ag, Au, and some platin metals. Difference - very small number of pure elements in nature.

When atoms bond in complex particles, they form molecules. A molecule can be made out of two or more atoms. If a molecule is made out of the same atoms, it is the molecule of an element, and if a molecule is made from different atoms it is a molecule of the compound.

The difference of a compound
When elements are mixed to produce a compound during a chemical reaction, elements lose their properties and the compound has different properties.
Also, different proportions give different compounds.

Eq. By mixing different amounts od C and O2, we may get two different molecules – compounds
On the other hand,elements always have the same properties....

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