12. Convert 11.1 liters to centiliters.
A. 1,110 centiliters
B. 11,100 centiliters
C. 111 centiliters
D. 111,000 centiliters
13. Which of the following tasks should be performed before measuring the mass of any object on a triple-beam balance?
A. Make sure that the balance pan is clean and free of debris.
B. Make sure that the balance is on a level surface.
C. Make sure that all the counterweights are set to zero.
D. all of these
14. Convert 49.6 hectograms to grams.
A. 496 grams
B. 496,000 grams
C. 4,960 grams
D. 49,600 grams
15. Which of the following measures the amount of matter in a given object?
A. weight
B. density
C. mass
D. volume
16. Before using glassware in the lab, it is important to _______.
A. carefully inspect the glassware for cracks and chips
B. know the location of the classroom broom, dustpan, and broken glassware container
C. make sure that the glassware is clean and dry
D. all of these
17. Genevieve was working on a science lab. In her lab, she was combining two chemicals and timing how long the reaction took to form a precipitate. She repeated the investigation a total of five times. Her times are shown below.
trial time (min:sec)
1 08:37
2 07:59
3 08:16
4 08:21
5 08:03
The next day, the instructor told Genevieve that the standard time for her investigation should have been 8 minutes 7 seconds. Which of the following choices describes Genevieve's work in the lab?
A. Her test trials had a high level of accuracy but a low level of precision.
B. Her test trials had a high level of accuracy and a high level of precision.
C. Her test trials had a low level of accuracy but a high level of precision.
D. Her test trials had a low level of accuracy and a low level of precision.
18. As part of an experimental procedure, Tom must measure exactly 15 milliliters of distilled water. Which of the following tools should Tom use for this task?
A. a 250-mL graduated cylinder
B. a teaspoon
C. a small paper cup
D. a 20-mL graduated cylinder
19. Alexis was interested in the way mirrors reflect. The living room of Alexis' house had one big window in the front, and a very large mirror on the back wall. Alexis hypothesized that the room would heat up faster in the morning with the mirror on the wall than it would if the mirror were covered with a sheet that was the same color as the walls.
What will make Alexis' hypothesis valuable?
A. Any testable hypothesis is valuable.
B. It will be valuable only if it is proved incorrect.
C. It will be valuable only if it is proved correct.
D. It cannot be valuable because the investigation is in her house and not in the science lab.
You do have a problem, don't you?
It looks like you should study your text book to find these answers.
i cant find them how about you if you know them then how about you just post the answers
Oh, my! If I gave you the answers, I'd be as guilty of cheating as you are. Besides, I'm a teacher and telling you the answers doesn't help you learn.
can you just please tell me the answers
12. A
13.D
14.C
16.D
Some of the answers by anonymous are not correct.
12. To convert liters to centiliters, you need to know that there are 100 centiliters in 1 liter. So, to convert 11.1 liters to centiliters, you multiply 11.1 by 100. The correct answer is D. 111,000 centiliters.
13. Before measuring the mass of any object on a triple-beam balance, it is important to perform all of the tasks mentioned. A clean and debris-free balance pan ensures accurate measurements, a level surface prevents any imbalance, and setting all counterweights to zero ensures the balance is properly calibrated. Therefore, the correct answer is D. all of these.
14. To convert hectograms to grams, you need to know that there are 100 grams in 1 hectogram. So, to convert 49.6 hectograms to grams, you multiply 49.6 by 100. The correct answer is B. 4960 grams.
15. The measure of the amount of matter in a given object is called mass. Therefore, the correct answer is C. mass.
16. Before using glassware in the lab, it is important to carefully inspect the glassware for cracks and chips, know the location of the classroom broom, dustpan, and broken glassware container, and make sure that the glassware is clean and dry. Therefore, the correct answer is D. all of these.
17. Genevieve's lab work can be described as having a high level of precision but a low level of accuracy. Precision refers to how close the repeated measurements are to each other, while accuracy refers to how close the measurements are to the true or target value. In this case, her measurements (times) are close to each other but not close to the standard time provided. Therefore, the correct answer is A. Her test trials had a high level of accuracy but a low level of precision.
18. To measure exactly 15 milliliters of distilled water, Tom should use a 20-mL graduated cylinder. The graduated cylinder allows for more precise measurement than a teaspoon or a small paper cup. The 250-mL graduated cylinder would be too large for this task. Therefore, the correct answer is D. a 20-mL graduated cylinder.
19. A hypothesis is valuable if it is testable, regardless of whether it is proved correct or incorrect. In this case, Alexis' hypothesis about the heating effect of a mirror in the room can be tested and valuable insights can be gained, regardless of the outcome. Therefore, the correct answer is A. Any testable hypothesis is valuable.