Answer:
The equinoxes are the only time when both the Northern and Southern Hemispheres experience roughly equal amounts of daytime and nighttime. On Earth, there are two equinoxes every year: one around March 21 and another around September 22.
Explanation:
Answer:
destroyed, from, endothermic
Explanation:
Energy is conserved in chemical reactions. It is neither created nor destroyed but can be transferred from one form to another.
An exothermic reaction transfers energy from the reacting substance to the surroundings. The body of the container feels warm. An exothermic reaction has a negative value of enthalpy.
An endothermic reaction transfers energy from the surroundings to the reacting substance. The body of the container feels cold. In an endothermic reaction, enthalpy is positive.
Answer:
1
Explanation:
single displacement replaces one element with another and it's product is a pure element.
Answer:
<em>Hope this helps :)</em>
Explanation:
Antoine Lavoisier- used patterns to predict undiscovered elements
John Newlands- Arranged elements according to their atomic
Johann Wolfgang- created groups of three elements, each based on Johann Wolfgang Dobereiner
Dmitri Mendeleev- divided elements into four categories
