When 4 . 2 gram of NaHCO 3 is added to a solution of acetic acid weighing 10 . 0 grams. It is observed that 2 . 2 grams of CO 2 is released into atmosphere. The residue left behind is found to weigh 12 grams. Show that these observations are in agreement with law of conservation of mass.

Law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. NaHCO 3 4 . 2 g + CH 3 COOH 10 g → CO 2 2 . 2 g + Residue 12 g On the reactants side, the sum of masses is 4 . 2 + 10 = 14 . 2 g On the products side, the sum of masses is 2 . 2 + 12 = 14 . 2 g Since, mass is the same on both sides. The Law of conservation of mass is valid.

E M B I B E

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 7

EASY

11th CBSE

IMPORTANT

Earn 100

Vanadium metal is added to steel to impart strength. The density of vanadium is $5.96$ $g / {cm}^{3}$ . Express this in S.I. units ( $kg / m^{3}$ ).

Important Questions on Some Basic Concepts of Chemistry

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 8

A piece of metal is

3

inch (represented by in) long. What is its length in cm?

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 9

A jug contains

2

L of milk. Calculate the volume of milk in m³.

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 10

How many seconds are there in

2

days?

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 1

What mass of silver nitrate will react with

5.85 g

of sodium chloride to produce

14.35 g

of silver chloride and

8.5 g

of sodium nitrate, if the law of conservation of mass is true?

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 2

When

4.2

gram of

NaHCO

₃is added to a solution of acetic acid weighing

10.0

grams. It is observed that

2.2

grams of

CO

₂ is released into atmosphere. The residue left behind is found to weigh

12

grams. Show that these observations are in agreement with law of conservation of mass.

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 3

If

6.3 g

of

{NaHCO}_{3}

are added to

15.0 g

of

{CH}_{3} COOH

solution, the residue is found to weigh

18.0 g

. What is the mass of

{CO}_{2}

released in the reaction?

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 1

2.16

g of copper metal when treated with nitric acid following by ignition of the nitrate gave

2.70

g of copper oxide. In another experiment

1.15

g of copper oxide upon reduction with hydrogen gave

0.92

g of copper. Show that the above data illustrate the law of Definite proportions.

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 2

Silver chloride is prepared by dissolving $0.5 g$ of silver wire in nitric acid and adding excess of hydrochloric acid to silver nitrate formed. The silver chloride precipitated is separated, washed and dried. The weight of silver chloride is $0.66 g$ . Find the mass percentage of the constituents.