Answer:
B) the chemicals are gaining energy from the surroundings.
Explanation:
The positive sign of the energy difference in a chemical reaction would indicate that the chemicals are gaining energy from the surroundings. This is what happens in an endothermic reaction.
In an endothermic reaction, heat is absorbed from the surroundings hence the surrounding becomes colder at the end of the changes.
- Here the energy change is assigned a positive value.
- This is because the heat energy level of the final state is higher than that of the initial state.
- So, the difference gives a positive value.
We would all DIE and end up DEAD
Answer:
C C2H5OH(l) + 3O2(g) → 2CO2 + 3H2O
Explanation:
La ley de conservación de la materia implica que en una reacción química los átomos en los reactivos son iguales a la cantidad de átomos en los productos:
A C2H5OH(l) + O2(g) → CO2 + H2O
En los reactivos hay dos átomos de carbono pero en los productos solo 1. De esta manera, no cumple la ley de conservación.
B C2H5OH(l) + O2(g) → 2CO2 + H2O
En los reactivos hay 6 átomos de hidrógeno pero en los productos solo 2. No cumple la ley de conservación.
C C2H5OH(l) + 3O2(g) → 2CO2 + 3H2O
En los reactivos y productos hay: 2 átomos de carbono, 6 átomos de hidrógeno y 7 átomos de oxígeno. Cumple la ley de conservación.
D C2H5OH(l) + O2(g) → 2CO2 + 3H2O
En los reactivos hay 3 átomos de oxígeno y en los productos 7. No cumple la ley de conservación.
E 2C2H5OH(l) + 3O2(g) → 2CO2 + 3H2O
En los reactivos hay 4 átomos de carbono y en los productos solo dos. No cumple la ley de conservación.
Answer: The percent of sulfate is present in the coal samples is 0.999%.
Explanation:
Given: Percentage of sulfur present = 3%
In 
, the percentage by weight of Sulfur is calculated as follows.
This means that the amount of only sulfur present in in the sample is as follows.
Thus, we can conclude that percent of sulfate is present in the coal samples is 0.999%.
The question is incomplete; the complete question is;
Why will the conjugate base of a weak acid affect pH? Select the correct answer below: O it will react with hydroxide
O it will react with water
O it will react with hydronium
O none of the above Content attribution
Answer:
O it will react with hydronium
Explanation:
If we have a weak acid HA, the weak acid ionizes as follows;
HA(aq) ----> H^+(aq) + A^-(aq)
A^- is the conjugate base of the weak acid.
H^+ interacts with water to form the hydronium ion as follows;
H^+(aq) + H2O(l) ----> H3O^+(aq)
The pH=[H3O^+]
But the conjugate base of the weak acid reacts with this hydronium ion thereby affecting its concentration and the pH of the system as follows;
A^-(aq) + H3O^+(aq) ------> HA(aq) + H2O(l)
