Realgrades

What does a positive Ecell imply? - correct answers A spontaneous reaction If Ered is smaller or more negative, than the substance is more likely to be... - correct answers Oxidized Do voltage, potential, and EMF all mean the same thing? - correct answers Yes What is the difference between a voltaic cell and an electrolytic cell? - correct answers Voltaic cells are spontaneous; electrolytic cells require outside energy. What is the charge of the anode in a voltaic cell? - correct ans...

Light is composed of particles. - correct answers false Light is composed of waves - correct answers false Light sometimes behaves as if composed of waves - correct answers true Light sometimes behaves as if composed of particles - correct answers true Light is a form of electromagnetic radiation - correct answers true Photons are packets of energy - correct answers true photons have no mass - correct answers true photons have no electrical charge - correct answers true p...

things tend to go _______________ in energy - correct answers downhill concentration - correct answers how much you can dissolve and how much you put in it formula for molarity (M) - correct answers moles of solute/liters of solution; unit is mol/L formula for mole fraction (X) - correct answers moles of solute/(moles of solute+moles of solvent); unit is moles? formula for molality (m) - correct answers moles of solute/kilograms of solvent; unit is mol/kg what is the molality of 7...

formula for rate - correct answers ∆concentration/∆time effect of concentration on rate of reaction - correct answers increased concentration means an increase in the probability of having more collisions, increasing the rate of reaction effect of temperature on rate of reaction - correct answers molecules must collide with enough kinetic energy to react, increasing the temperature increases the kinetic energy which makes collision more likely and increases the chance that a collision ...

What is reaction rate a ratio of? - correct answers concentration of reactant or product per unit time (Δ[A]/Δt) What does a rate law do? - correct answers shows how rate depends on concentrations of reactants (ex. rate = k[A]²[B]) What do exponents in a rate law represent? How can they be determined? - correct answers reaction order, which can only be determined experimentally (not from balanced equation) Why do concentrations of products not appear in the rate law? - correct answer...

The density of a solution that is 18.0% by mass lead nitrate [Pb(NO3)2] is 1.18 g/cm3. Calculate the molarity of the lead nitrate solution. - correct answers b. 0.64 M What is the definition for molality? - correct answers d. moles of solute/Kg of solvent How many moles of sucrose, C12H22O11, is present in 80.0 grams of an aqueous solution that is 3.50% sucrose by mass? MM(C12H22O11) = 342.30 g/mol - correct answers a. 8.18 x 10^-3 moles At 20 C the Henry's law constant for N2O is ...

For a reaction, what generally happens if the temperature is decreased? - correct answers A decrease in k occurs, which results in a slower rate. Define Le Chatelier's Principle. - correct answers When a chemical system at equilibrium is disturbed, the system shifts in a direction that minimizes the disturbance. Give the characteristic of a second-order reaction having only one reactant. - correct answers The rate of the reaction is proportional to the square of the concentration of the...

Which of the following molecular compounds would be highly soluble in hexane, C6H14? - correct answers C6H6 Consider the three statements and pick the best answer. I. An increase in disorder favors dissolution. II. Most spontaneous processes are exothermic. III. At constant temperature, when more solid is added to a supersaturated solution, the added solid dissolves. - correct answers 1 and 2 are true, 3 is false For solubility the higher the temperature the: - correct answers less so...

miscible - correct answers liquids that dissolve freely in one another in any proportion, no solubility limit (ie, water, ethanol) two ways to change solubility limit - correct answers change temperature, change pressure temperature - correct answers solids: deltaH >0, endothermic, ^ temp= ^ solubility limit, favors (aq): heat+solute(s) <=>solute(aq) gases: deltaH <0, exothermic, ^ temp decreases solubility limit, favors (s): solute(g) <=> solute(aq)+heat pressure - c...

quickly - correct answers gases react more [slowly/quickly] than liquids concentration, temperature, catalyst, diffusion rate - correct answers factors affecting reaction rates reaction rate - correct answers the speed of a chemical reaction in molarity/second change in concentration of B/change in time - correct answers average rate of appearance of B instantaneous rate - correct answers the rate of reaction at a particular moment initial rate - correct answers rate at time = 0 ...