Analyze the reaction to determine whether the
reaction is exothermic or endothermic. Explain
your reasoning.
CHA + 202 → 2H2O + CO2 + 891 kJ
CH4 + O2
Potential Energy
CO2 + H2O
Time

Exothermic

Explanation: Looking at the graph, you see that the reaction started with more energy than it ended with, meaning it gave out its energy over the course of the reaction. This is also confirmed by the reaction equation, which shows the energy (891 kJ) on the right side of the equation.

The reaction is exothermic.   A net release of energy from the reacting

substances into the surroundings makes

this an exothermic reaction.   The equation shows that 891 kJ of energy

are released as a product.   The graph shows that the reactants have

greater potential energy than the products.

This means the difference in energy is

released to the surroundings.

Explanation:

I got it correct on Edg. :-)

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3