mr. gibson – room 213 thursday 15-september-2011 slides for in-class assessment

Mr. Gibson – Room 213Thursday 15-September-2011Slides for in-Class Assessment

Significant Figures

(Sig Figs)Addition & Subtraction

1. Solve the following problem rounding your answer to the proper number of significant figures;

5.00 g 10.0 g + 5.005 g = g

Significant Figures


1. Solve the following problem rounding your answer to the proper number of significant figures;

5.00 g 10.0 g + 5.005 g = 20.005 g = 20.0 g

Significant Figures


2. Solve the following problem rounding your answer to the proper number of significant figures using proper scientific notation;

5.001 x 10cm- 1.00 x 10 cm= cm

+3+2

Significant Figures


2. Solve the following problem rounding your answer to the proper number of significant figures using proper scientific notation;

5.001 x 10 cm = 50.01 x 10

-1.00 x 10 cm= -1.00 x 10

= 49.01 x 10= 4.901 x 10= 4.90 x 10

+3

+2

+2+2+2+2+2

General Laboratory Safety &

Procedure Rules

3. (True or False) – It is acceptable to drink bottled water in the lab setting after all of the student’s work is done.


Procedure Rules

4. (True or False) – A store wrapped piece of candy that has been in your friend’s work station is okay to eat later after leaving the lab.


Procedure Rules

5. (True or False) – Your student team is using 70% Rubbing Alcohol - which is flammable -for a paper chromatography test and 50 mL is in an open beaker with the cover watch glass alongside;

As you are preparing for the next step another student team is working on next lab table doing element identification flame tests.

Since; both teams have work in progress -- this is acceptable.


Procedure Rules

6. (True or False) – Your lab experiment is running longer than expected. The next step requires your team to plug in the electric heater at the far work table and begin to heat it up to 185 degrees centigrade for a heat transference study. Once it reaches that temperature you are to unplug the heater and place your unknown solution on it and record the temperature drop over time. Because you are running late your team-mate suggests you bring the heater over next to your solution bath and plug it in now to save time as they measure out the solution. This is okay to do.


Procedure Rules

7. (True or False) – An unknown clear colorless solution is at your workstation when you come into the lab. It is next to the sink. To save time and get started you decide to put on a latex glove, grab a paper towel and push the liquid into the sink. This is really not unsafe.


Procedure Rules

8. (True or False) – Your lab partner and you are done early with your experiment and you are cleaning up your area. It is very hot in the lab. As you clean it is okay to slip your safety goggles up onto your forehead to see better. This action is really more safe than keeping them on while cleaning.


Procedure Rules

9. (True or False) – Your lab partner and you are preparing for an experiment that requires you to use a 100 mL beaker, 100 mL volumetric flask, a glass stirring rod, and a 250 mL graduated cylinder . You both know that Malik Brown had this station the previous hour and he is a top student who follows all procedures. The glassware is very clean in appearance and you know Malik never leaves a mess. It is safe procedure to start your experiment.


Procedure Rules

10. (True or False) – Your lab partner had just finished your experiment and you need to begin organizing your data. You have cleaned up your part of the lab, but your partner left the area. It is okay for you to leave as well to do your paperwork.


Procedure Rules

11. (True or False) – You just arrived to do your lab exercise and Malik Brown had the same area the class before. He told you he had unplugged the water bath about thirty minutes ago. After he leaves you notice a glass stirring rod in the bottom of the water bath. It is okay to reach in an get it out before heating up the bath since it is only water.


Procedure Rules

12. (Short answer) – You just arrived to do your lab exercise and you realize you forgot to bring a second sharpened pencil or any notebook paper for notes. In your own words, what general rule applies to this situation? _____be prepared


Procedure Rules

13. (True or False) – You have just arrived to do your lab and you notice someone had left a disposable cutting blade number 15 in your area. Not being familiar with what the other class had been doing, you see broken glass in the waste basket near the lab table and you decide to wrap the blade in three paper towels and gently put it in the waste basket. Since the jagged glass pieces are there, this is acceptable for you too.


Procedure Rules

14. (Multiple Choice) – You have just arrived to do your lab and you notice your friend Malik Brown, who has this work station the class before yours, left a glass rod and beaker out. Do you (a) put them away in the drawer because you know he cleans everything really well –or- (b) you notify Mr. Gibson about the condition of your work station area?

The Six Step Scientific Method

15. (True or false) – The first step of the Six step Scientific Method is – Observation.


16. (True or false) – The 3rd Step – Hypothesis- can either be written as a question or a statement as long as it is in the “IF.”.. “THEN”… format.


17. (True or false) – Any observed event can be subject to the six step scientific method.


18. (True or false) – In the six step scientific method , during the Experimental Step– if studying a sound activated light system; by clapping your hands to test the system and turn it on – this would be classified as the dependent variable [as] the experiment “depends” on you clapping your hands.


19. (Multiple Choice) – In the six step scientific method , during the Experimental Step– by setting aside a duplicate of the experiment; this is called the:

a) Independent variable;

b) Dependent variable;

c) Control;d) Non-variable


20. (Multiple Choice) – In the six step scientific method , data calculation is carried out in the step:

a) Experimentation;b) Research;c) Analysis;d) Conclusion


21 (Multiple Choice) – In the six step scientific method , the step that answers the question posed in the Hypothesis is:

a) Experimentation;b) Research;c) Analysis;d) Conclusion

mr. gibson – room 213 thursday 15-september-2011 slides for in-class assessment

Documents

lab table

lab experiment

student team

students work

far work table

following problem

proper scientific notation5

electric heater