Key Stage 3 Biology: The Particle Model

Fill-in-the-blank practice flashcards covering models, the particle model, the three states of matter, and molecular representations from Key Stage 3 Biology.

A model is used in science to view an object in a more __________ size.

manageable

In science, models are used because some things, such as an atom or the solar system, are either too small or __________ to comprehend or view.

too large

In the particle model, atoms or particles are represented by __________ on a page.

circles

In the particle model for a solid, particles are close together in a __________ pattern.

regular

In the particle model for a liquid, particles have __________ between them and appear to be moving.

small gaps

In the particle model for a gas, particles are __________ and appear to be moving quickly.

spread out

A model in science is often used to simplify complex theories, but a key limitation is that it can often __________ important information.

over-simplify

Sometimes atoms stick together as they move around to form __________.

molecules

There are a total of __________ atoms in a single molecule of water ($H_2O$).

$$3$$

In this particle model diagram of a water droplet, the arrangement of molecules demonstrates that the water droplet is in the __________ state.

liquid

The three states of water are solid (ice), liquid (water), and gas (__________).

steam

Air hurts less than water or a solid upon impact because air is a gas and has __________ particles in a given space.

fewer

A chair is painful to be hit with because it is a __________ and therefore has lots of particles in a given space.

solid