Grade 7 Integrated Science · Strand 1: Scientific Investigation · Laboratory Safety
Safe Chemical Handling
A short Grade 7 Integrated Science lesson for the CBE curriculum, part of Scientific Investigation: Laboratory Safety. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.
1. Why are unverified skin-lightening creams dangerous to human health?
- A. They may contain mercury and hydroquinone, which damage the skin and build up in the kidneys
- B. They contain too much table salt, which dries the skin
- C. They evaporate too quickly and leave greasy marks on clothes
- D. They neutralise the stomach acids when put on the skin
2. A learner needs to dilute concentrated acid in the laboratory. Which is the correct and safe method?
- A. Pour water quickly into the concentrated acid
- B. Add the acid slowly to water while stirring continuously
- C. Mix equal amounts of acid and water at the same time without stirring
- D. Heat the water first, then pour the acid in all at once
3. Which of the following is the correct way to dispose of a dilute acid left over after a practical?
- A. Pour it into the storm drain outside the laboratory
- B. Pour it onto the school garden soil
- C. Neutralise it with a weak alkali to pH 7, then flush with plenty of water
- D. Store it in an open beaker on the bench
4. What name is given to the chemical reaction between an acid and a base that forms a salt and water?
Type your answer in the lesson.
5. Which of the following should be done when transferring solid chemicals in the laboratory?
- A. Pick the crystals with bare fingers if the solid looks harmless
- B. Return unused solid to the stock bottle so nothing is wasted
- C. Use a clean, dry spatula and never return excess solid to the stock bottle
- D. Place the chemical directly on the balance pan
More in Laboratory Safety
- Safe Handling and Operation of the Bunsen Burner
- Safe Handling and Care of Laboratory Glassware and Measuring Apparatus
- Safe Handling and Care of Optical Instruments The Microscope
- Electrical Safety and Safe Circuit Assembly
- Laboratory Safety Showcase
- Introduction to Laboratory Apparatus and Safety
- Heating Apparatus The Bunsen Burner
- Supporting and Heating Glassware
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