1. Naphthalene (Mothballs, C1oHs) is an example of a(n): a. Mixture b. Element c

Question

1. Naphthalene (Mothballs, C1oHs) is an example of a(n): a. Mixture b. Element c. Compound 2. The type of compound found in the air that can endanger our health is a. CO2 b. NO2 c. NaO2 d. SiO2 3. The substance that has definite shape and definite volume is known as: a. Mixture b. Liquid c. Gas d. solid 4. Rain water contains: a. dust b. particulate matter c. gases d. all of the above 5. The following are concentration terms except: b. Molarity a. Density c. Percentd. Parts per million 6. The smallest part of an element is known as a. molecule b. atom c.proton d. electrons 7. The following are compounds except a. Water b. Baking soda c. Chalk d. Air 8. When vinegar is added to baking soda, bubbles of gas are observed. The products are a. Bubbles of gas b. Vinegar & Baking soda d. Bubbles &vinegar; 9. The chemical formula of Baking soda is a. NaHCO3 10.Yeast is also used for the same purpose for which baking soda is used c. Vinegar d. CaCO3 because it produces the gas that makes the bread to rise. This gas is a. CO2 11. The ion formed when oxygen (O) atom gains electrons is called the a. Oxygen ion b. oxide ion C. oxidate ion d. oxonium ion 12.The following gain electrons to become anions except: c. CO d. C20 b. Oxygen c. Magnesium d. Fluorine a. Nitrogen 13.Which of the following elements is most likely to form cation a. Neon b. Phosphorus c. Sulfur d. Aluminum 14.When the reaction below is balanced, the coefficient on O2 will be c3Hs + O2 CO2 + H2O

Explanation / Answer

1.C(compound),

2.B,

3.D(solid),

4.D,

5.A(density),

6.B(atom),

7.A(water),

8.A,

9.A,

10._,

11.B,

12.C,

13.D,

14.9/2(C3H6+9/2O2®3CO2+3H2O).

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