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WorksheetsBSMT MIDTERM EXAM REVIEWER
Total questions: 30
Worksheet time: 24mins
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
Which of the following is the correct laboratory rule?
Eating in the laboratory while doing practical during lunch time
Running in the laboratory when he is in a hurry
Poking the electrical power points with sharp objects
Using the apparatus in the laboratory only when told to do the science teacher
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
When pouring concentrated acid from a reagent bottle into a test-tube, which of the following is the best method of holding the bottle?
Holding the base of the bottle
Holding the bottle where its label is
Holding the bottle by its neck
Holding the bottle with both hands
A student working in a laboratory accidentally spilled concentrated hydrochloric acid on his hand. The most practical thing to do is __________.
To go to the hospital immediately
To rub the hand with a wet towel
To rub the hand with a dry towel
To wash the hand quickly under running water
Which of the following apparatus is the best one to use for measuring a fixed volume of liquid accurately?
Beaker
Cup
Gas jar
Pipette
If the air holes of a Bunsen burner are fully opened the flame will be __________.
Short, non-luminous and hot
Long, sooty and non-luminous
Short, luminous and hot
Short, sooty and hot
Which of the following is the correct laboratory rule?
Handling test-tube using a test-tube holder when pouring chemical
Pouring excess chemical back into its container
Reading instruction carefully before doing any experiments
Reporting accident immediately to your friends
An __________ and a __________ are used to measure the diameter and mass of marble respectively
External caliper, beam balance
External caliper, spring balance
Internal caliper, beam balance
Internal caliper, spring balance
1. Improper use of pipette can lead to contamination of chemicals
TRUE
FALSE
2. Autoclaves are needed to sterilized laboratory equipment.
TRUE
FALSE
3. Wear protective clothing, gloves, mask, etc. as appropriate
TRUE
FALSE
4. Throw water if there is a fire
TRUE
FALSE
5. Ask your teacher before proceeding to an experiment.
TRUE
FALSE
6. It’s important to understand and practice emergency procedures.
TRUE
FALSE
7. Small accidents don’t need to be reported.
TRUE
FALSE
9. Chemical containers without appropriate labels should not be used.
TRUE
FALSE
8. You should inspect equipment and accessories before every use.
TRUE
FALSE
1. What should you do before you start lab?
Read all the procedures in laboratory manual
Make sure your work area is dirty
Enter laboratory without teachers permission
Eat in the laboratory
2. If your lab partner gets chemicals in his/her eyes, the first thing you should do is
Make the person sit down to calm their nerves
Clean up spilled chemical
Take them to eye wash and tell the teacher immediately
Call 999
4. Why are safety symbols important?
They tell me how to do an experiment
Because the icon looks cool
Symbols tell me the content of the substances
They tell me specific dangers
5. I should wear safety google when .....
in lab
working with chemicals, acids and bases and heating devices
I look in the sun
I want to look cool
Flammable liquids burn only when their vapor is mixed with air in the appropriate concentration. When handling flammable liquids you should
minimize the creation of flammable vapors
use adequately ventilated work areas
avoid nearby sources of ignition
all of the above
Long hair in the laboratory must be
cut short.
tied back or kept entirely out of the way with a hair band, hairpins, or other confining device.
always neatly groomed.
held away from the experiment with one hand.
What type of reaction involves 2 substances combining to form 1 new compound?
Decomposition Reaction
Single Displacement Reaction
Double Displacement Reaction
Synthesis Reaction
Why do sugar particles dissolve faster in hot water?
water particles move slow
water particles move fast
water particles settle down
water particles stay on top
How does particle size affect solubility?
bigger particles dissolve faster
smaller particles can occupy the space in water faster
bigger particles spread faster than smaller particles
What are the factors that affect solubility?
rate of stirring
particle size
temperature
all of these
What combination would dissolve a solid solute the fastest?
high temperature, no stirring
no heat, no stirring
sugar cube, no heat
high temperature, stirring
