Advertisements
Advertisements
Question
What are elements? What are they made of?
Advertisements
Solution
- Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.
- It is made of entirely from one type of atom.
APPEARS IN
RELATED QUESTIONS
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Define: Compounds
Give one example for the following types of mixtures :
misicible liquids
State the number of atoms of each element, present in \[\ce{HNO3}\].
Also name the compound.
Indicate whether the following statement is true or false:
Elements are made up of compounds
Select the correct answer from the choice given below.
The unreactive non-metallic element
Match the compounds in List I – 1 to 20 with their correct formulas from in List II-A to T.
| List I | List II | ||
| 1 | Hydrochloric acid | A | NaCI |
| 2 | Potassium Hydroxide | B | NaOH |
| 3 | Sulphuric Acid | C | KCI |
| 4 | Zinc Hydroxide | D | Ca(OH)2 |
| 5 | Sodium Chloride | E | CaS |
| 6 | Nitric Acid | F | CuSO4 |
| 7 | Calcium Hydroxide | G | CaCO3 |
| 8 | Carbonic Acid | H | NH4CI |
| 9 | Sodium hydroxide | I | HCI |
| 10 | Copper sulphate | J | ZnO |
| 11 | Potassium Chloride | K | HNO3 |
| 12 | Calcium Carbonate | L | H2CO3 |
| 13 | Magnesium Sulphide | M | MgS |
| 14 | Zinc Sulphate | N | MgO |
| 15 | aluminium Hydroxide | O | KOH |
| 16 | Sodium Carbonate | P | ZnSO4 |
| 17 | Calcium Sulphide | Q | Na2CO3 |
| 18 | Magnesium Oxide | R | H2SO4 |
| 19 | Zinc Oxide | S | AI(OH)3 |
| 20 | Ammonium Chloride | T | Zn(OH)2 |
Select the correct answer from A, B, C, D & E for the statement given below :
A noble gas.
Elements are the______ form of pure substances.
Name the two elements which are derived from the country.
