ATOMIC STRUCTURE

ROCK SALT IS A MIXTURE OF SAND AND SALT. What method of separation is best suited to separate them?

• sieving

• filtration

• distillation

• chromatography

Observe the figure . What word best describes the salt solution?

• distillate

• filtrate

• polymer

• supernatant

a student conducted a chromatography investigation of green ink and obtained the result as shown. Why did the yellow dye move further?

Answer explanation

the solubility of the yellow dye is more in the solvent than the blue dye

The isotopes of an element have _________ (similar/different) properties.

Explain why isotopes of an element have similar properties even though they differ in mass number.

Answer explanation

chemical properties are based on the number of electrons. Isotopes have the same number of electrons

Balance the equation: Fe₂O₃ + C ---> Fe + CO₂

Answer explanation

2Fe₂O₃ + 3C ----> 4Fe + 3CO₂

THE NUMBER OF PROTONS PRESENT IN THE NUCLEUS OF THE ATOM OF AN ELEMENT REPRESENTS ITS ________________

Which technique of separation would you use to separate hydrated copper (II) sulphate from its aqueous solution?

• distillation

• evaporation

• crystallization

• filtration

Observe the table given. What would be physical state of element caesium at 30^OC

• solid

• liquid

• gas

• plasma

Classify strontium as metal or non metal using data from the table

• metal

• non metal