Download App

Atoms and Molecules — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceAtoms and Molecules2 Marks
Question
Is it possible to see atoms these days? Explain your answer.
✓

Answer

Yes, ‘THE SCANNING TUNNELLING MICROSCOPE’ enables people to see atoms. This microscope can produce computer generated images of the surface of elements which show the individual atoms. The atoms show up as blurred images.

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 "Answer the questions.[Che-2M]" from Atoms and Molecules→Atoms and Molecules — all question types→Science STD 9 question papers→CBSE Board STD 9 question papers→CBSE Board question paper generator→

Similar questions

What is the valency of these elements and why?
→
You have been given a suspension and a solution. How could you tell the difference between them by their appearance?
→
Define the term ‘latent heat of fusion’ of a solid. How much is the latent heat of fusion of ice?
→
Calculate the mole ratio of 240g calcium and 240g of magnesium.
(Ca = 40u; Mg = 24u)
→
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.
→
What are radioactive isotopes? Give two examples of radioactive isotopes
→
Write any two observations which support the fact that atoms are divisible.
→
Describe the essential properties of the atomic nucleus. Compare these with the properties of the electron.
→
Calculate the molecular masses of the following compounds:
  1. Methanol, CH3OH
  2. Ethanol, C2H5OH
→
Hydrogen has three isotopes written as:

$^1_1\text{H},\ ^2_1\text{H},\ ^3_1\text{H}$

Explain why:

  1. These isotopes have almost identical chemical properties.
  2. They are electrically neutral.
→