1. Unit 1 Clicker Review

2. What is the following and what is it used for?
A. test tube holder, holding test tubes
B. double buret clamp, holding burets
C. forceps, picking up small objects
D. crucible tongs, holding crucibles

3. What is the following and what is it used for?
A. test tube holder, holding test tubes
B. double buret clamp, holding burets
C. forceps, picking up small objects
D. crucible tongs, holding crucibles

4. What is the following and what is it used for?
A. test tube holder, holding test tubes
B. double buret clamp, holding burets
C. forceps, picking up small objects
D. crucible tongs, holding crucibles

5. What is the following and what is it used for?
A. test tube holder, holding test tubes
B. double buret clamp, holding burets
C. forceps, picking up small objects
D. crucible tongs, holding crucibles

6. What is the following and what is it used for?
A. crucible, heating to high temperatures
B. graduated cylinder, measuring volume
C. watch glass, covering evaporating dish
D. evaporating dish, evaporating

7. What is the following and what is it used for?
A. crucible, heating to high temperatures
B. graduated cylinder, measuring volume
C. watch glass, covering evaporating dish
D. evaporating dish, evaporating

8. What is the following and what is it used for?
A. crucible, heating to high temperatures
B. graduated cylinder, measuring volume
C. watch glass, covering evaporating dish
D. evaporating dish, evaporating

9. What is the following and what is it used for?
A. crucible, heating to high temperatures
B. graduated cylinder, measuring volume
C. watch glass, covering evaporating dish
D. evaporating dish, evaporating

10. Which of these would be  best  to measure 14.2 mL of liquid water?
A 25 mL volumetric flask
B 25 mL graduated cylinder
C 25 mL Erlenmeyer flask
D 25 mL beaker

11. The figure shows an experimental setup  used to separate the components of a  colored ink sample. Which of the  following describes this laboratory technique?
A Filtration
B Decanting
C Chromatography
D Distillation

12. The volume of the hammer  is approximately—
A 5 mL
B 64 mL
C 4 mL
D 69 mL

13. Why should excess chemicals never be  returned to reagent bottles?
A.The entire stock bottle of the chemical would be contaminated if the container holding the  excess chemicals has some contamination.
B.A spill could be created if excess chemicals  are poured from the retaining bottle to the  original  chemical stock bottle.
C.The excess of chemicals would be shaken  when placed back into the original chemical  stock,  thus creating an explosive environment.
D.The excess chemical would spoil because it was exposed to additional oxygen when placed in a  retaining bottle.

14. A student did not follow proper safety procedures  while conducting a chemistry  experiment and forgot to wear safety goggles. During the experiment an acidic solution splashed into the student's eyes causing  severe pain. What are the correct  steps that the  student should have taken during this emergency?
AThe student should immediately begin rinsing his  eyes at the eye wash station while his partner  notifies the instructor.
Bthe student should inform his partner that his eyes are severely burned and go to the bathroom  for water. CThe student should quickly notify the instructor of the problem and ask for permission to rinse  his eyes.
DThe student should ask the instructor for permission to visit the school nurse.

15. If a student's hand is accidentally exposed to an  acidic solution, what should be done?
A Rinse the hand in cold running water
B Wrap the hand in paper towels
C Cover the hand with oil
D Rinse the hand in a concentrated base

16. What is the correct order to add water and acid  together?
A1. Acid is poured into a beaker.  2. Water and  salt are then poured into the beaker with acid.
B1. Acid is poured into a beaker.  2. Water is then poured into the beaker with acid.
C1. Water is poured into a beaker.  2. Acid is then poured into the beaker with water.
D1. Water and salt are poured into a beaker.   Acid is then poured into the beaker with  water.

17. If you dissolve sugar in different types of solvents to determine which solvent dissolves the sugar fastest, what is the independent variable.
A. amount of sugar
B. amount of solvent
C. time to dissolve
D. type of solvent

18. If you dissolve sugar in different types of solvents to determine which solvent dissolves the sugar fastest, what is the dependent variable.
A. amount of sugar
B. amount of solvent
C. time to dissolve
D. type of solvent

19. Why do experiments do many trials?
A. So the results can be averaged to give a more accurate result.
B. So the results can be published in multiple data tables.
C. So that each lab group has a chance to do the experiment
D. So that more material can be used up during experimentation

20. What is the correct reading for significant figures?B C
D. 146

21. 4.2089300 X 105 g expresses how many significant figures?
B. 6
C. 8
D. 9

22. A student measured the density of an object three times
A student measured the density of an object  three times. He recorded the following  density measurements: 1.5 g/mL, 1.6 g/mL,  and 1.3 g/mL. The  actual density of this object is  1.49 g/mL. After finding the average of the  student's  measurements, what was the percent error between the student's average  measurement of density and the actual density of the object?
A. 2.3%
B. 2.0 %
C. 3.3 %
D %

23. Which of the following contains the greatest number of significant digits?
A g
B g
C g
D g

24. Add the following and choose the answer with the correct number of significant digits. 4.5 g g g=?
A. 22 g
B g
C g
D g

25. When the products of a reaction have different chemical properties than the reactants that formed them, it is an indication that
A. a chemical change has occurred
B. no change has occurred
C. the reactants are contaminated
C. a physical change has occurred

26. A chemical property would include
A. boiling point
B. crystalline structure
C. freezing point
D. decomposition

27. What is this a picture of?
A. heterogeneous mixture
B. homogeneous mixture
C. colloid
D. sublimation

28. Calculate the density with the correct number of significant figures is the volume is 6.7mL and the mass is 5.67 g.
A g/mL
B. 1.2 g/mL
C g/mL
D g/mL