An experiment is carried out to study the solubility of sodium chloride in water and in benzene. What is the

(i) manipulated variable and

(ii) constant variable

of the experiment?

• (i)water and bezene and (ii) rate of stirring

• (i) water and bezene and (ii) mass of sodium chloride

• (i) water and (ii) volume of solvent

• (i) bezene and (ii) rate of stirring

An experiment should be carried out in the fume cupboard if it involves

• the release of poisonous gas.

• the release of flammable gas.

• the use of corrosive chemicals.

• the use of oxidising chemicals.

protects from inhaling harmful air particles as dust, vapour, fumes and gases

• mask

• Googles

• A protective mask

• Eyes cleaner

provides protection to the eyes

• Eyes drops

• Protective mask

• Safety googles

• Sunglasses

a small box containing items such as bandages, plasters, and antiseptic wipes for use in giving help to a sick or injured person until full medical treatment is available.

• First aid kit

• cabinet

• fire extinguisher

• Fume chamber

instrument used to transfer liquids or fine-grained materials into containers with small openings. Also used for filtration

• pipette

• funnel

• beaker

What tool is this?

• Beaker

• Test Tube and Holder

• Graduated Cylinder

• Pipette

Tags

NGSS.5-PS1-4

Before you leave the science room, you should...

• Clean your work area and equipment

• Return all equipment to the proper storage area

• Wash your hands with soap and water

• All of the above

When you finish working with chemicals, living things, and other lab substances, always...

• Treat your hands with skin lotion

• Wash your hands thoroughly with soap and water

• Wipe your hands on a towel

• Wipe your hands on your clothes

The following activity is allowed in the lab...

• Chewing gum

• Eating

• Drinking

• None of the above