Your task is to measure the amount of energy evolved during the combustion of some hydrocarbon, then the ideal technique for this experiment would be : Bomb calorimetry
<h3>What is bomb calorimetry?</h3>
Hydrocarbons are combustibles means that they can react in a combustion reaction to produce energy. To measure this energy, it's a necessary equipment so that the reaction can be placed in a controlled way.
The bomb calorimeter is the equipment, which is an adiabatic vessel, with water and heat is calculated based on the increase in the temperature of the water.
Coffee-cup calorimetry is used to measure the heat of a dissolution reaction and bomb manometry is used to measure the pressure.
To know more about bomb calorimetry, refer
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Answer: -
37.5 g of NaCl are in 250 g of a 15.0% (by weight) solution.
Explanation: -
Total mass = 250 g
Percentage of NaCl = 15.0 %
=
Thus =
Number of grams of NaCl present =
= 37.5 g
Answer: the last choice, It separates dissolved substances, which is a physical change.
Explanation:
Physical changes do not modify the composition of the substances.
The substances that undergo a physical change do not brake or form chemical bonds, they just modify ther appearance: the size, the physical state (solid, liquid, or solid), the density, the shape, that kind of properties.
The salts dissolved and the water will have the same chemical properties in solution and after being separated, so they have not had a chemical change, they have only changed their appearance, so this explains why it is a physical change.
Dehyrdration should happen to join two monosaccharide units into a dissacharide. It is used to build up molecules by losing some water moleculse in the process. In a dehydration synthesis reaction between two un-ionized monomers. Hope this answers the question. Have a nice day.
Water is a pure substance, however it is made up of oxygen and hydrogen atoms, hence the nickname H2O (Hydrogen2, Oxygen)