Chemistry Test Grade 10

Question 1

What is titration?

Answer 1

A lab technique used to determine the concentration of a solution by adding a reactant of known concentration until a reaction is complete.
Determine the concentration of an unknown solution.

Question 2

Equipment

Answer 2

A burette
A clamp
A stand
An erlenmeyer
A boss
A pipette
A funnel
Solution 1
Solution2
Universal Indicator
Volumetric flask
Bulb filler
Beakers
Water bottle
Dropper pipette
Protective glasses
Lab coat
Gloves

Question 3

C
n
v

Answer 3

Concentration
Moles
Volume

Question 4

Safety

Answer 4

Don’t pour solution above your head (use boss to bring clamp down)
Don’t pour too much, to avoid overflowing
Write solution on beaker

Question 5

Conclusion

Answer 5

state magnitude and direction of the percentage (my results were 6% higher - or lower - than the literature value.

Question 6

Percent Error

Answer 6

[(|Experiment result - accepte value|) / accepted value] x 100%

Question 7

Tables

Answer 7

o Tables have a number and a descriptive title that is specific to the data

o Columns in tables follow a logical sequence, i.e. dictated by the steps taken during the data processing (calculations)

o Table headers mention thecorrect quantities, units and measurement uncertainties, e.g. “Initial Volume, +/- 0.05 ml”

o All data (raw and processed) in tables are correct

Question 8

Evaluation

Answer 8

o Evaluate the accuracy of the data
o Evaluate the precision of the data

Question 8

Conclusion

Answer 8

o State the final result
o State the goal of the experiment

o Describe in a few sentences how the goal was achieved (overview of method)

o Calculate and use the percent error

Question 9

Accuracy

Answer 9

refers to how close a measurement is to the true or accepted value.

Question 9

Precision

Answer 9

refers to how close measurements of the same item are to each other. Precision is independent of accuracy.