Experimental Design
What is a hypothesis?
If______then_____ will happen.
What is the purpose of wearing goggles in the lab?
To protect your eyes.
How do you calculate percentage error?
subtract the "actual value" from the "experimental value", then divide the absolute value of that difference by the "actual value" and multiply by 100%
What is the SI unit for mass?
kilogram
How do you convert Celsius to Kelvin?
℃ + 273.15 = K
What is the purpose of a control in an experiment?
To compare the results of the experiment to.
When should you use the safety shower?
When there is something physically harmful on your body or clothes.
If the accepted value is 50 and the experimental value is 45, what is the percentage error?
10
What unit is used to measure temperature in the SI system?
Kelvin
If the temperature is 45 K, what is it in Fahrenheit?
(K - 273.15) x 9/5 + 32 = ℉
-414.67
Define independent and dependent variables
Independent variable is the cause. Dependent variable is the effect (changes due to the independent).
What should you do if you spill a chemical on your skin?
Tell the teacher, then use the sink or shower to rinse off.
What does a percentage error of 0% indicate?
It means that the value was measured exactly the same as the accepted value.
Name the standard unit for volume.
Liter
Explain how to convert Fahrenheit to Celsius.
(℉ - 32) x 5/9 = ℃
Explain the importance of repeat trials in an experiment.
To continue to get the same answer with no mistakes.
Describe the function of a fume hood.
To collect any fumes from spreading to the rest of the class.
How is percentage error useful in experiments?
To know how close the measured value is to the actual value.
What is the SI unit for length?
meter
What is absolute zero in Kelvin?
0 Kelvin
What is the last thing you do in an experiment?
Draw your conclusion.
What is the proper way to dispose of chemical waste?
In a chemical waste bin.
Define accuracy and precision in relation to percentage error.
Accuracy- how close your value or measurement is to the correct value.
Precision- how close repeated measurements are to each other.
Explain why standard units are important in scientific measurements.
for accuracy and accurate data
Bonus