JJJ Good Luck JJJ

Chemistry Test 1  Good Luck 

Name______

Class______Date______

I. Identify (4points each) a. Density

b. Independent Variable

c. Dimensional Analysis

d. Accuracy

e. Significant Figures

f. Hypothesis

II. Multiple Choice (3 points each)

1. Why should chemicals be removed from stock containers in small amounts? a. It is easier to measure small amounts of chemicals b. Returning large amounts of chemicals to their stock containers can result in spills c. Carrying large amounts of chemicals in test tubes is difficult d. Returning unused chemicals to the stock container can result in contamination

2. How should you prepare an acid solution? a. Add the acid to the water all at once b. Add the water to the acid very slowly c. Add the acid to the water very slowly d. Add the water to the acid all at once

3. Which term refers to how close a series of measurements are to one another? a. Precision b. Accuracy c. Percent error d. Derived unit Chemistry Test 1  Good Luck 

Name______

Class______Date______4. A means of expressing numbers as a multiple of two factors: A number between 1 and 10, and ten raised to a power, or exponent is called: a. Base unit b. Dimensional analysis c. Scientific notation d. Derived unit

5. Look at the figure above. What aspect of measurement evaluation does the figure on the far right represent? a. Precision only b. Accuracy only c. Both precision and accuracy d. Neither precision nor accuracy

6. A control is a ____. a. variable that changes during an experiment. b. standard for comparison. c. type of dependent variable. d. type of experiment

III. Short Answer

1. The SI base unit for length is the ______(2 pts)

2. The SI base unit of electric current is the ______(2 pts)

3. Susan decided she wanted to determine which brand of antacid was most effective in neutralizing stomach acid. She purchased 5 types of antacid tablets. . She measured the recommended dosage of each of the five antacids, which she pulverized. She then measured out 6 equal samples of Hydrochloric acid. She measured the pH of each of the samples, then she Chemistry Test 1  Good Luck 

Name______

Class______Date______added the antacid to 5 of the test tubes. After mixing the antacid into the sample, she measured the pH again.

Is this a valid experiment? Why or why not? (2 pts)

4. Identify the control in the above experiment (2 pts)

5. Identify the independent & dependent variable in the above experiment (2pts)

6. Determine the number of significant figures in the following measurements (10 pts)

a. 2434l00 mL ______b. 0.6590 L ______c. 123001200 g ______d. 2.43 x 104 kg______e. 35201.10 ns ______

IV. Calculations (YOU MUST SHOW ALL YOUR WORK!!!)

1. (4.60 x 10-9/6.0 x 10-9)/(342 *1.04) (3 pts)

2. Convert 4310 centimeters to meters.(5 pts)

3. The volume of a sample of iron is 86.3 cubic centimeters. What is the density of a sample containing 354.2 g of Iron? (5 points)

4. 0.75 kg to milligrams (4pts)

5. 2390 cg to kg (4pts) Chemistry Test 1  Good Luck 

Name______

Class______Date______

6. 750 milligrams to g (3pts)

7. 0.25 Decameters to m (4 pts)

8 2.77 ng to mg (4 pts)

9 45.6 centiliters to megaliters (4 pts)

10 9.57 x 10¯8 mm to kilometers (4 pts)