100 Science Facts

Inference

a conclusion based on your observations

Observation

a record of what you see, touch, taste, smell and/or hear

Matter

anything that has mass and takes up space

Physical Change

occurs when there is a change in the physical properties, but the chemical properties stay the same

States of matter

the physical forms in which a substance can exist

Chemical Change

a change that occurs when one or more substances are changed into entirely new substances with different properties

Changes of State

are physical changes because the identity of the matter is not changed. The atoms and molecules only speed up or slow down when energy is added or removed

Chemical Properties

are the ways in which a substance reacts with another substance

Solids

atoms and molecules in this state of matter are very close together and vibrate in place

Gas

atoms and molecules in this state of matter move fast enough to break away completely from one another

Liquids

atoms and molecules in this state of matter spread out and slide past each other until the liquid takes the shape of the container

Physical Properties of Matter

can be observed or measured without changing the identity of the matter