An exothermic reaction<span> is a chemical </span>reaction<span> that releases energy by light or heat. It is the opposite of an </span>endothermic reaction<span>. Expressed in a chemical equation: reactants → products + energy.</span>
Answer:
burning wood be a chemical change because it wouldn’t be able to go back to its original form. A physical change would be a broken pencil. The pencil is still a pencil, it’s just a physical change.But if it were burned it would be a chemical change.
Explanation:
Answer:
True
Explanation:
True because of the law of conservation of mass, the same same amount of atoms will be on both sides of the reaction.
They are in free fall. In a vacuum, gravity causes all objects to fall at the same rate, and since they all are falling together. The astronauts and other objects appear to float when compared with the spacecraft.
Answer:
Explanation:
Chlorine has electronic configuration of 2 , 8 , 7
In n = 3 there are 7 electrons out of which 2 are in s , and 5 are in p . But out of 5 electrons in p , one electron jumps into d orbital . so the electronic configuration becomes as follows
= 7
![3s^23p_x^23p_y^13p_z^13d_{xy}^1](https://tex.z-dn.net/?f=3s%5E23p_x%5E23p_y%5E13p_z%5E13d_%7Bxy%7D%5E1)
These orbitals like sp³d hybridise to form 7 degenerate orbitals out of which 2 orbitals contain electrons in pairs and rest three are singly occupied by electrons.( unpaired electrons )