Two changes are described below. ice melts to form water. sugar cubes dissolve in hot coffee. which statement is true about the two changes? both are chemical changes because there is a change in the composition of ice and sugar. both are physical changes because there is a change in the physical states of ice and sugar. a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Match each statement with the state of matter it describes