Elements are cooked up inside the hot interiors of stars, and spread to interstellar clouds by means of supernova explosions, and when those clouds condense to form planets, different elements encounter each other and then form chemical bonds because those bonds allow them to have more stable electron configurations. These combinations of elements are then called chemicals.
A physical change occur when the molecular structure of chemicals are not changed.A chemical change occur when the molecular structure of chemicals is changed.
I wouldn't say that many chemicals occur naturally in the air, however Oxygen and Nitrogen are the two main gases that make up the Earth's atmosphere.
A physical change occur when the molecular structure of chemicals are not changed.A chemical change occur when the molecular structure of chemicals is changed.Grinding is physical, neutralization of an acid is chemical.
A physical change occur when the molecular structure of chemicals are not changed.A chemical change occur when the molecular structure of chemicals is changed.Grinding is physical, neutralization of an acid is chemical.
A physical change occur when the molecular structure of chemicals are not changed.A chemical change occur when the molecular structure of chemicals is changed.Grinding is physical, neutralization of an acid is chemical.
About 80% of the first 117 elements occur in the nature in a stable manner.
Compounds can be formed or broken down. ~ Dre.R ~
The pain-controlling chemicals in the body are called endorphins.
We, most injuries in a lab occur when chemicals explode or are knocked over. Hope this helps!
A physical change occur when the molecular structure of chemicals are not changed.A chemical change occur when the molecular structure of chemicals is changed.
Eyewash stations should be no more than 10 seconds walk from where chemicals are used and splashed may occur.
Displacement may occur, or if both are made up in water, displacement reactions may occur between the ions of water and each chemical may occur