Atoms and Molecules — Science STD 9 — Question

Fill in the following blanks with suitable words:
The best evidence that the particles of matter are constantly moving comes from the studies of ________ and ________.

Fill in the following blanks with suitable words:
Brine is a ___________ whereas alcohol is a ___________.

Complete the following statements:
Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass number are called ____________.

Fill in the following blanks:

Atomic number	Mass number	Protons	Neutrons	Electrons	Symbol
10	22	............	............	............	............

Physical changes are generally..........

Fill in the blank.
The arrangement of paritcles is less ordered in the ______ state. However, there is no order in the ______ state.

Complete the following statements:
The valency of nitrogen in N₂ molecule is ________.

Evaporation of a liquid at room temperature leads to __________ a effect.

Fill in the following blanks with suitable words:
Solid, liquid and gas are the three _________ of matter.

Fill in the following blanks with suitable words:
A heterogeneous mixture of liquid and solid is conveniently separated by ___________.