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प्रश्न
What are the three general classes of matter ? Give one example of each type.
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उत्तर
Three general classes of matter are elements, compounds, and mixtures.
Element: Oxygen
Compound: Water
Mixture: Salt solution
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संबंधित प्रश्न
All kinds of matter
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
The three important metalloids are.............................. and ..........................
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
What are pure substances ? Give two examples of pure substances.
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
Name two solid, two liquid and two gaseous elements at the room temperature.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
“Is malleable and ductile” best describes :
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
Which of the two will scatter light : soap solution or sugar solution ? Why ?
Choose the correct answer.
A 5 per cent sugar solution means that :
State whether the following statement is true or false :
Sponge is an example of solid sol.
Explain what happens when a beam of light is passed through a colloidal solution.
Name the process which can be used to recover salt from an aqueous salt solution.
If there is a sudden shower, we take shelter under a roof at the roadside. Even though the rain does not fall on us directly, we get wet to some extent. Why ?
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
Define the term matter.
Define the term matter.
