Physical properties are any properties of matter which can be perceived or observed without changing the chemical identity of the sample.
Chemical Properties
Chemical properties cannot be determined by touching or viewing a sample.
Physical Properties
Without these we wouldn't know what is an organism is like
Sun
Photosynthesis
Plants need light from the sun to do photosynthesis and humans need oxygen and food from the plants.
The sun is the ball of fire in the sky that the Earth goes round, and that gives us heat and light.
Photosynthesis is a chemical reaction that takes place inside a plant, producing food for the plant to survive. Carbon dioxide, water and light are all needed for photosynthesis to take place.
Producing Light energy from solar panels.
If there is no light there would be less energy in the world that humans can use.
Solar-powered photovoltaic (PV) panels convert the sun's rays into electricity by exciting electrons in silicon cells using the photons of light from the sun.
Pesticides
Pests
Pesticides are chemicals that we humans use to kill pests we don't want.
Pesticides are chemical compounds that are used to kill pests
A destructive insect or other animal that attacks crops, food, livestock, etc.
