Introduction to chemsitry

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