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?

Evaluate responses using AI:

OFF

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.

Evaluate responses using AI:

OFF

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