Answer:
The answer for number one is .A
The answer for number two is heat rises
Explanation:
1) Endothermic reactions:
a) The reaction between ammonium nitrate and water absorbs heat from the surrounding environment.
There are two types of reaction: endothermic reaction (chemical reaction that absorbs more energy than it releases) and exothermic reaction (chemical reaction that releases more energy than it absorbs).
b) Ammonium chloride dissolved in a beaker of water makes the beaker cold.
Dissolving this salt absorbs heat from beaker.
c) Water separates on hydrogen and oxygen when an electric current is run through it.
Electrolysis of water is the decomposition reaction (heat is required), because from one molecule (water) two molecules (hydrogen and oxygen) are produced. Water is separated into two molecules.
2) Exothermic reactions:
a) Three drops of concetrated sulfuric acid added to 100 milliliters in a beaker makes the beaker hot.
Energy is released, beaker absorbs that heat.
b) Uranium atoms are split to produce nuclear energy.
Nuclear energy is released.
c) Methane and oxygen are combined to produce methanol and heat.
Balanced chemical reaction: 2CH₄ + O₂ → 2CH₃OH + heat.
Answer: Law of definite proportion.
Explanation: Law of definite proportion states that any chemical compound consists of elements in a fixed ratio by their masses. This law is also known as Proust's Law.
We are given a chemical compound 
Assuming that the total mass of 1 mole of = 100 grams
where
Mass of Sodium = 27.37 grams
Mass of Hydrogen = 1.20 grams
Mass of Carbon = 14.30 grams
Mass of Oxygen = 57.14 grams
To Calculate the ratio of all the elements, we divide each of the masses by the lowest mass.
Mass ratio of elements in 
Na : H : C : O = 23 : 1 : 12 : 48
For every compound, this mass ratio will always be constant.
An igneous rock that cools rapidly is made out of really small mineral crystals.
Yes it is. Copper is the same mass and volume. Plus all pennies are made of copper
