PRACTICE FOR MIDTERM 1:

Please note that these questions were made to understand concepts I think are worthy of knowing before the exam. Please note that I have not seen any previously made exams and you SHOULD NOT only rely on this practice as preparation for the test. I highly recommend working through the Tro problems that the teacher assigned as well as reading the book/powerpoints. I also made these questions multiple choice AND free response to reflect the testing style of the teacher. (These problems are pulled from an MCAT practice book, me, and some are pulled from previous SI practice exams)

1. What is the multiple for the prefix nano-?a. 10-6

b. 10-9

c. 106

d. 109

2. Diamond has a density of 3500 mg/m3. What is the volume, in cm3, of a 1 3/4 -carat diamond (where, by definition, 1 carat = 0.2 g)a. 10 cm3

b. 1 cm3

c. 0.1 cm3

d. 0.01 cm3

3. What is the formula weight of calcium phosphate: Ca3(PO4)2?a. 310 amub. 350 amuc. 405 amud. 450 amu

4. THIS QUESTION CONTAINS TWO PARTS:

Which has the greater molecular weight: potassium dichromate (K2Cr2O7) or lead azide (PbN6)

Which contains more molecules: 1 mole sample of potassium dichromate or 1 mole sample of lead azide

5. How many molecules of hydrazine, N2H4, are in a sample whose mass is 96 grams?

6. What is the empirical formula for ethylene glycol, C2H6O2?a. CH3Ob. CH4Oc. CH6Od. C2H6O2

7. What is the percent composition by mass of each element in sodium azide, NaN3?a. Sodium 25%, nitrogen 75%b. Sodium 35%, nitrogen 65%c. Sodium 55%, nitrogen 45%d. Sodium 65%, nitrogen 35%

8. What is the percent composition by mass of carbon in glucose, C6H12O6?a. 40%b. 50%c. 67%d. 75%

9. What is the empirical formula of a compound that is, by mass, 90% Carbon and 10% Hydrogen?a. CH2

b. C2H3

c. C3H4

d. C4H5

10. An atom whose nucleus contains 7 neutrons and which has a mass number of 12 is an isotope of which element?a. Nitrogenb. Magnesiumc. Potassiumd. Boron

11. An atom contains 16 protons, 17 neutrons, and 18 electrons. Which of the following best indicates this atom?a. 33Cl-

b. 34Cl-

c. 33S2-

d. 34S2-

12. Boron has 2 naturally occurring isotopes: boron-10 with an atomic mass of 10.013 amu, and boron-11 with an atomic mass of 11.009 amu. Boron-10 accounts for 20% of all naturally occurring boron and boron-11 accounts for the other 80%. What is the atomic weight of boron?

13. Which of the following could describe an ion with the same electron configuration as a noble gas?a. An alkali metal that has gained an electronb. A halogen that has lost an electronc. A transition metal that has gained an electrond. An alkaline earth metal that has lost two electrons

14. Choose the pure substance from the list belowa. Airb. Carbon Monoxidec. Tead. Sodae. A and B

15. Choose the heterogenous mixture from the list belowa. Filtered waterb. Chicken noodle soupc. Aird. Sodium Chloridee. A and C

16. A chemical change occurs when _______.

a. Glucose is converted into energy within cells

b. Water vaporizes

c. CO2 sublimes

d. Dew forms on a blade of grass

e. A and C

17. The recommended dose adult dose of a drug used to treat asthma is 63.5 mg/kg of body mass calculate the dose in g for a 135-lb person. (1 lb = 453.59g)

18. Elements of group 2A in the periodic table tend to form ions of _____ charge.

a. +1

b. +2

c. 0

d. -1

e. -2

19. Name the compound H3PO4 (aq)

a. Phosphorous acid

b. Phosphoric acid

c. Phosphate acid

d. Hydrophosphorous acid

20. Name the compound Cs2S

a. Dicesium monosulfide

b. Cesium sulfide

c. Cesium sulfate

d. Dicesium monosulfate

Study Tips

· Go through questions posted in PowerPoints as they are good examples of test questions, plus the answers are worked out if you get stuck

· First go through the Tro problems assigned by the teacher, if you have extra time do additional textbook problems.

· Knowing the name, charge and formula of polyatomic Ions are very useful

· This practice test contains a majority of math questions because students tend to struggle on them the most, but major concepts will also be tested. Be familiar with concepts outlined at the end of each chapter.

· Review with a friend, watch videos, re-watch lectures to clear up any misunderstandings!