CHEMISTRY FIRST CA

Chemistry is a Branch of.....

• History

• Biology

• Science

• Geography

What is this?

• Atoms of an element

• Mixture

• Compound

• Molecules

Which of the following is not a Medicine

• Aspirin

• Penicillin

• Paracetamol

• Detergent

What happens during evaporation ?

• More water appears.

• Water stays with the mixture.

• Water becomes a solid.

• Water turns into water vapor and is no longer in the dish.

In this mixture, which of the following will be the solute?

• The powder on the spoon

• The water in the glass

• The glass that holds the final mixture

• The solution containing both powder and water

A particular soil is a mixture of sand, dead plant matter, water and air. The states of matter in this mixture are

• Solid, liquid and gas

• Solid only

• Solid and liquid only

• Liquid and gas only

THOSE SUBSTANCES WHICH CONTAIN ONLY __________ OF CONSTITUENTS PARTICLES, MOLECULES AND COMPOUNDS ARE CALLED PURE SUBSTANCE.

• ONE KIND

• PURE SUBSTANCE

• HOMOGENEOUS MIXTURE

• HETEROGENEOUS MIXTURE

Iron and copper screws could be separated using a magnet because

• iron is magnetic, copper is not

• copper is magnetic, iron is not

• copper screws are heavier than iron and fall off the magnet

• neither metal is magnetic

SEPARATION OF MIXTURES INTO THEIR CONSTITUENTS IS OFTEN NECESSARY TO..

• TO OBTAIN PURE SUBSTANCES

• TO REMOVE UNDESIRABLE CONSTIUENTS

• TO OBTAIN USEFUL CONSTITUENTS

• ALL OF THE ABOVE

By which process is oil and vinegar is commonly separated?

• Distillation

• Sedimentation

• Decantation

• Condensation