Here are the answers in order:
1. During a physical change the substance changes physically.
2. The law of conservation of mass is a law stating the conservation of mass cannot be higher than 46mg or lower than 32mg.
3. A hypothesis is a guess that you make before completing a science experiment, it can be considered a law because it is important to know why you are making the guess.
4. During a chemical change the mass is changing colors. This is a representation of a chemical change.
5. Oil is a non-renewable resource, so it cannot demonstrate the conservation of mass.
6. When the color of the substance has changed or when it explodes.
7. Reactants are the objects that react when in a chemical change.
8. If you follow the rule of not going higher than 46mg and not lower than 32mg then it will automatically follow this law.
Chemical Reactions Part One Video:
1. mass
2. erupt-ant
3. reactant
4. object
5. mixtures
6. molecules
7. color changed
Questions again:
1. A chemical reaction
2. A physical change
3. Because if it is no higher than 46mg and no lower than 32mg then it will follow on it's own.
Answer:- A) Exothermic, B) Reactant side(left side), C) Product side(right side), D) Reactant side(left side) and E) Le-chatelier's principle.
Explanations:- A) 
of the reaction is negative and it indicates an exothermic reaction.
B) Equilibrium shifts to the reactant side if nitrogen gas is removed. If anything is added then reaction moves in a direction where this added component is used and if something is removed then reaction moves in a direction where this removed component is formed.
C) Exothermic reactions are favored at low temperature and endothermic reactions are favored at high temperature. The temperature is lowered, so the reaction will shift to the product side.
D) The reaction shifts to the reactant side if ammonia is added so that it could be used to reestablish the equilibrium.
E) Le-chatelier's principle helps to answer B-D. As per this principle, reaction shifts in a direction where the stress is relieved. It means if anything is added then it must be used and if something is removed then it must be formed.
The balanced chemical reaction is written as:
<span>CH4 (g) + 2 O2 (g) ----> CO2 (g) + 2 H2O (g)
</span>
We are given the amount of water to be produced from the reaction. This amount will be used for the calculations. Calculations are as follows:
12.4 L H2O ( 1 mol / 22.4 L ) ( 1 mol CH4 / 2 mol H2O ) ( 22.4 L / 1 mol ) = 6.2 L CH4
Answer:
The answer will be approximately 1.0L
Explanation:
The problem has not been properly specified. You could have specified a gas in a PISTON, whose volume would decrease with increased pressure, and increase with increased temperature.
For such a system, we would use the
combined gas law:
=
=
=
1.0L
