Advertisements
Advertisements
Question
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Advertisements
Solution
Hydrogen and oxygen are considered as elements because they cannot be split further into simpler substances by usual chemical methods as they are made of one kind of atoms. On the other hand, water is not an element, as it consists of different types of atoms, i.e., hydrogen and oxygen and can be split up into its components by chemical processes.
APPEARS IN
RELATED QUESTIONS
Liquids have definite shape and definite volume.
Explain why air is used to inflate tyres.
What are the characteristics of matter?
Name the property which allows metals to be hammered into thin sheets.
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
Name a metal which can be easily cut with a knife.
Which one of the following is not a metalloid ?
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
Naphthalene can be separated from sand :
Wipe the board with a duster and then tap the duster against the table. What do you see?
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
 |
 |
 |
The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
Name the metals that are used in jewellery.
Which statement is not correct for a mixture
Evaporation does form bubbles.
The fluidity of solids: ______.
Evaporation is always accompanied by ______ in temperature.
