Download App

Atoms and Molecules — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceAtoms and Molecules2 Marks
Question
Define mole. What are the two things that a mole represents?
✓

Answer

A group of 6.022 × 1023 particles (atoms, molecules or ions) of a substance is called a mole of that substance. One mole represents the amount of a substance equal to its 'GRAM ATOMIC MASS' or 'GRAM MOLECULAR MASS' and 6.022 × 1023 no. of particles of the substance.

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 "Que-Ans (Each of 2 Mark )" from Atoms and Molecules→Atoms and Molecules — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

A boy weighing 40kg makes a high jump of 1.5m.

  1. What is his kinetic energy at the highest point?
  2. What is his potential energy at the highest point? (8 = 10m/s2).
→

What will happen if apical meristem is damaged or cut?

→

What is alternation of generation?

→
A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give reason for your answer.
→
What are cathode rays? What is the nature of charge on cathode rays?
→
What are the quantities on which the amount on which the amount of work done depends? How are they related to work?
→
What is the main function of each of the following organelles?
  1. Ribosome.
  2. Cell wall.
→
What is meant by uniform circular motion? Give two examples of uniform circular motion.
→
What is the significance of the formula H2O?
→
How does the force of gravitation between two objects change when the distance between them is reduced to half ?
→