Advertisements
Advertisements
प्रश्न
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Advertisements
उत्तर
On heating, sugar powder is charred and becomes black while salt does not char. When dissolved in water, the salt solution will conduct electricity because it is ionic while sugar solution will not conduct electricity because it is covalent.
APPEARS IN
संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
Write the names of `("NH"_4)_2"SO"_4` compounds:
What are orbits or shells ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Name three non-metals/radicals which have valency -1, -2, and -3.
Give two examples for each of ionic and covalent bond.
Name the particle or particles you would expect to find in :
The orbit of an atom
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
Why is it not possible to see an atom even with the most powerful microscope ?
How many times is a proton heavier than an electron?
Is it possible to see atoms these days ? Explain your answer.
Which of the following statement is correct about the atom of an element ?
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Select the correct answer to the statement given below:
Imaginary path around the nucleus of an atom in which electrons revolve.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
Define the following term with an example.
Compound
