Question

9 fill in the blanks to complete the sentences. all substances are made up of atoms which join together to form molecules. the way the particles behave depends on the conditions surrounding them.

Explanation:

All substances are composed of atoms which can combine to form molecules. The behavior of particles is influenced by the conditions around them such as temperature, pressure etc. In this context, the most appropriate word for the blank is 'conditions' as it encompasses various environmental factors affecting particle behavior.

Answer:

conditions