MIDTERM EXAM DPC

What is the very first thing you do once you receive any laboratory equipment?

• Start Measuring out chemicals

• inspect for cracks or damages

• Organize/ Sort your equipment

• Wash/Disinfect

Name the equipment 

• iron ring 
• iron stand 
• iron base
• iron tower

Name the equipment

• test tube pin
• test tube metal
• test tube coil
• test tube clamp

Name the equipment

• A coaster

• A wire gauze

• A place mat

• A heatprof mat

(Select all that apply.) What is wrong in the picture?

I. Smelling a chemical directly

II. Wearing open toed shoes.

III. Wearing ear buds during lab.

IV. Using hands to pick up broken glass.

• I

• II

• III

• IV

• Nothing is wrong.

The following are some safety rules in a laboratory. Which one is not correct?

• Do not eat or drink in the laboratory

• Do not report any injury, however small, to the teacher

• Do not taste chemicals in the laboratory

• Do not run in the laboratory

Ali would like to heat a test-tube containing chemical X over a Bunsen burner. How should Ali carry put the heating?

• Holding the test tube with his bare hands

• Holding the test tube with a piece of cloth

• Holding the test tube using a test tube holder

• Holding the test tube with tongs

How CLOSE a measurement or attempt is to the actual value is the definition of ..............

• systematic

• precision

• accuracy

• sensitivity

How CONSISTENT our results are regardless of proximity to the actual value is the definition of .......

• accuracy

• target value

• uncertainty

• precision

Which of the following shows an accurate but not precise data

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•