>Atoms and Molecules>Law of Conservation of Mass

Law of Conservation of Mass

IMPORTANT

Important Questions on Law of Conservation of Mass

HARD

IMPORTANT

Atoms and Molecules>Law of Conservation of Mass> Q 1

Draw the diagram to show the experimental setup for the law of conservation of mass.

MEDIUM

IMPORTANT

Atoms and Molecules>Law of Conservation of Mass> Q 2

Imagine what would happen if we do not have standard symbols for elements?

HARD

IMPORTANT

Atoms and Molecules>Law of Conservation of Mass> Q 3

$15.9 g$ of copper sulphate and $10.6 g$ of sodium carbonate react together to give $14.2 g$ of sodium sulphate and $12.3 g$ of copper carbonate. Which law of chemical combination is obeyed? How?

HARD

IMPORTANT

Atoms and Molecules>Law of Conservation of Mass> Q 4

Explain the process and precautions in verifying the law of conservation of mass.

HARD

IMPORTANT

Atoms and Molecules>Law of Conservation of Mass> Q 5

Fill the following table:

Sl. No.	Name	Symbol/ formula	Molar mass	Number of particles present in molar mass
$1$	Atomic oxygen		$16 g$	$6.022 \times 10^{23}$ atoms of oxygen
$2$	Molecular oxygen
$3$	Sodium
$4$	Sodium ion		$23 g$
$5$	Sodium chloride			$6.022 \times 10^{23}$ units of sodium chloride
$6$	Water

MEDIUM

IMPORTANT

Atoms and Molecules>Law of Conservation of Mass> Q 6

A chemical reaction is carried out in a closed conical flask. Do you get the same result if the conical flask is not closed? (In terms of law of conservation of mass).

MEDIUM

IMPORTANT

Atoms and Molecules>Law of Conservation of Mass> Q 7

Recall the burning of the Magnesium ribbon in air. Do you think mass is conserved during this reaction?