Energy is absorbed making it feel colder.
The reaction container always feels hot.
The reactants have less heat energy than the products.
More heat is given off than is put into the reaction.
Answer:
-The reactants have less heat energy than the products.
Explanation;
-An endothermic reaction is a reaction in which heat energy is absorbed from the surroundings. In such a reaction the energy of the reactants is less than the energy of the products and therefore the enthalpy change is positive, greater than zero.
The answer is Energy is absorbed making it feel colder. Endothermic reactions absorb heat from their environment (hence lowering the temperature of the nearby environment), unlike ectothermic reactions that release energy to their environment . The enthalpy of products in an endothermic reaction is higher than that of the reactant hence the change in enthalpy is positive.
electromagnetic wave, mechanical wave, or both.
Electromagnetic wave travels faster through air than metal.
Option A
Explanation:
There are different kinds of wave energy. The most significant are electromagnetic and mechanical waves. The mechanical waves propagate through the medium by transfer of energy by vibrating of particles in medium.
So, the more number of particles present in the medium, the more fast the mechanical wave can propagate. So the mechanical waves travel faster in metals consisting of more number of free charge carriers. But electromagnetic waves does not need any of the medium to propagate. So it can travel faster in air than in metals.
Answer:To speed up the rate of hydrogen production
Explanation:
In the preparation of Hydrogen from the action of dilute acid on zinc metal, few drops of Copper(II)tetraoxosulphate(VI) solution is added to speed up the rate of production.
The hydrogen produced is shown in the equation below
Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
Thus, Copper(II)tetraoxosulphate(VI) solution, a catalyst is used to speed up hydrogen production.
Answer:The solubility of oxygen and other gases will decrease as temperature increases 9. This means that colder lakes and streams can hold more dissolved oxygen than warmer waters. If water is too warm, it will not hold enough oxygen for aquatic organisms to survive.
Explanation: