A solid, but they are constantly vibrating
I have never heard of the term native elements before but that must be it since carbonates contain CO₃, halides contain a halogen, and sulfates and sulfide contain either SO₄ or SO₃. Gold, silver, and copper can all become carbonates, sulfates or sulfides, and halides. However, by them selves they don't.
Answer: a truck crashes into a car
Explanation:
The truck drives in a wrong motion which makes the reaction of it crashing.
Answer:
The number of moles of a primary standard can be determined from its formula weight and its mass. If a volumetric flask is used to carefully make up a standard solution from a primary standard, the concentration can be calculated by dividing the number of moles of solute by the volume of the flask in liters.
Answer:
1. The enthalpy change for the backward reaction is –20 KJmol¯¹
2. The forward reaction is endothermic.
3. The activation energy for the forward reaction is +70 KJmol¯¹.
Explanation:
Considering the diagram given above, the following data were obtained:
1. The enthalpy change for the forward reaction being is +20 KJmol¯¹ and so, the enthalpy change for the backward reaction is –20 KJmol¯¹
2. The heat energy of the product is higher than that of the reactant. Therefore, the forward reaction is endothermic.
3. Activation energy is the minimum energy needed to be overcome in order for the reaction to proceed to product. It can be obtained from the energy profile diagram by considering the energy between the reactants and the peak.
For the question given above, Activation energy = 20 + 50
Activation energy = +70 KJmol¯¹
