A chemical reaction occurs when reactant particles collide with proper energy and proper orientation.
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A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Photosynthesis is an example from daily life
Answer:
The repeating pattern of a mineral's particles form a solid called a <u>crystal</u>.
Explanation:
41. Mercury,Venus, Earth,mars,Jupiter, Saturn,Uranus and Neptune
42. Nebula - Their birth places are huge, cold clouds of gas and dust
The acceleration is -8.89 m/s
