TEETH AND MICROBES

Solids do not flow. WHY?

• Molecules present in solids are very closely packed

  thus solids do not flow

• When sugar is dissolved in water, the volume of water

  remains the same.

WHAT TYPE OF MOLECULE IS THIS

• LIQUID

• GASE

• SOLID

When sugar is dissolved in water, the volume of water

remains the same.

• There are spaces between the water molecules.

  When sugar dissolves in water, sugar molecules fill these

  empty spaces so the volume of the water remains the

  same.

• Solids have definite shape

WHAT OPTION IS NOT TRUE ABOUT LIQUID

• In liquid molecules are tightly packed.

• liquid have a definite shape

• A liquid takes the shape of the containing vessel.

DEFINE

1. Matter:

• The amount of space matter takes up is called

   matter

• Anything that has weight and takes up space is called

  matter.

DEFINE

Molecules:

• The tiny particles in which the matter is made up

  of.

• Solids that dissolve completely in water

  are called a soluble substances.

How are teeth important?

• Teeth are very important to us because

  • It gives shape to our faces.

• It helps us to speak clearly.

Write any three ways how microbes are useful to us:

• -Some bacteria are used in making food such as cheese, yogurt

  and vinegar

• decay

• -Some bacteria help animals digest food.

How are holes and cavities formed in our teeth?

• dead plants and animals.

• When we eat food small bits of it may get stuck between our teeth.

  If we do not brush properly this food rots and germs start growing on

  them. These germs produce acids that harm the enamel. Small cavities

  are thus formed.

What kind of microbes are called germs?

• Disease causing microbes are called germs.

• dead