Download App

Is Matter Around Us Pure? — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?2 Marks
Question
Separate the following into physical and chemical changes:
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water.
✓

Answer

  • Physical change: Sublimation of solid, Formation of clouds, making of fruit salad from raw fruits, dissolving CO2 in water.

  • Chemical change: Decomposition of water into H2 and O2 by passing electric current.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Que-Ans (Each of 2 Mark )" from Is Matter Around Us Pure?→Is Matter Around Us Pure? — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

The given graph (Fig.) shows the displacement versus time relation for a disturbance travelling with velocity of 1500m s–1. Calculate the wavelength of the disturbance.

→

What do you mean by the term triploblastic animals? Give two examples.

→
Give postulates of Dalton's atomic theory.
→
An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?
→
Name any two simple and two complex permanent tissues in plants.
→
Calculate the concentration of a solution which contains 2.5g of salt dissolved in 50g of water.
→

What is the density of a substance of mass 100g and volume 10cm3?

→

List two bacteria which bring about nitrification.

→

On which day, a hot day or a cold day, an echo is heard sooner? Give reason for your answer.

→
Name the smallest and the largest cell.
→