Answer:
If this is that MC question then the answer is D.
Explanation:
The correct answer is D. The energy needed for a chemical reaction is called the activation energy. This energy is to be present in order for the reaction to happen. This can be achieved by supplying or releasing heat from a system of reactants. This can achieved faster by using a catalyst.
Answer:
A.) 2.0 M
Explanation:
Molarity=mole of solutes/Liters of solution so M=mol/L
2moles/4 L =2 M
Explanation:
They put five crickets in each of three identical containers. They s ... to 15°C, one to 20°C, and one to 25°C. Then they count the number of cricket chirps in each container
PV = nRT. Assuming it doesn't leak, volume and number of gas molecules remain constant. So I say (drum roll) none of the above!
Answer: -19 kJ
Explanation:
The change in enthalpy is mathematically expressed as the difference between the the total potential energy of products and the potential energy of the reactants :
Where:
Then:
The negative sign in this result means we have a negative enthalpy, hence an exothermic reaction (where heat is released).