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 ...

1 Exam (elaborations) Chem exam 4 questions and answers guaranteed pass 2 Exam (elaborations) chem 131 complete exam questions and correct detailed answers 3 Exam (elaborations) Chemistry: Exam 2 Questions And Answers Solution Guaranteed 4 Exam (elaborations) Chem Exam 4 Questions With Detailed Correct Answers 5 Exam (elaborations) The glycosyl

element that only needs 2 electrons to obtain full orbital - correct answers hydrogen element that only needs 4 electrons to obtain full orbital - correct answers beryllium element that only needs 6 electrons to obtain full orbital - correct answers boron what kind of elements can break the octet rule - correct answers non-metals in period 3 or higher elements that break the octet rule - correct answers chlorine, sulfur, phosphorus, bromine, argon, krypton, tin, antimony, xenon el...

A hot metal placed into a cup of cool water. The initial temperature of the water is 20 C. After several minutes, the temperature of the water stabilizes, and you notes that the temperature of the water increased by 10 C. What is the final temperature? - correct answers 30 C A chemical reaction is carried out in a sealed container at constant external pressure of 4atm. The intial volume of the container is 7L and the final volume is 2L. Determine the value of w - correct answers 20 L atm W...

List these Polyatomic Ions: 1. acetate 2. ammonium 3. carbonate 4. borate 5. bromate 6. thiocyanate - correct answers 1. C₂H₃O₂⁻ 2. NH₄⁺ 3. CO₃²⁻ 4. BO₃³⁻ 5. BrO₃⁻ 6. SCN⁻ List these Polyatomic Ions: 1. hypochlorite 2. chlorite 3. chlorate 4. perchlorate 5. cyanide 6. peroxide - correct answers 1. ClO⁻ 2. ClO²⁻ 3. ClO³⁻ 4. ClO⁴⁻ 5. CN⁻ 6. O₂²⁻ List these Polyatomic Ions: 1. chromate 2. iodate 3. permanganate 4. mangan...

Chemical bonding involves ______________ - correct answers valence shell electrons ________________ are formed from transfer of electrons - correct answers Ionic compounds Lattice energy - correct answers energy released when a solid is formed from its ions in gas phase Covalent bond - correct answers formed from share of electrons dipole moment with number means molecule is __________ - correct answers polar When the center of the molecule is the center of change distribution, th...

Chemistry - correct answers Chemistry is the study of structure and behavior of matter Scientific Method - correct answers Observation => Hypothesis => Experimentation => Publication => Confirmation => Application => Hypothesis Matter - correct answers Anything that has mass and takes up space Mass - correct answers The amount of matter in an object Weight - correct answers A measure of force of gravitational attraction between the object and a larger body Precis...

s orbital and p orbitals - correct answers In which orbitals would the valence electrons for carbon (C) be placed? 1.48 10-11 J - correct answers What is the nuclear binding energy of an atom that has a mass defect of 1.643 10-28 kg?Use E = mc2. (Remember: The speed of light is approximately 3.00 108 m/s.) burning a candle - correct answers A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which would be the best demonstration that sh...

Chemistry - correct answers The study of the structure and behavior of matter. Value - correct answers A number and unit that together represent the result of a measurement or calculation. The distance of a particular race, for example, may be reported as a value of 100 meters. Unit - correct answers A defined quantity based on a standard. For example, in the value 100 meters, meters is the unit. Base Units - correct answers The seven units from which all other units in the SI system of...

Acetate - correct answers C2H3O2- Carbonate - correct answers CO₃²⁻ hydrogen carbonate (bicarbonate) - correct answers HCO₃⁻ Hydroxide - correct answers OH- Nitrate - correct answers NO3- Nitrite - correct answers NO2- Chromate - correct answers CrO4 2- Dichromate - correct answers Cr2O7 2- Phosphate - correct answers PO4 3- Hydrogen Phosphate - correct answers HPO4 2- ammonium - correct answers NH4+ Hydrochloride - correct answers ClO- Chlorite - cor...

measurement - correct answers number with units (ex. ruler, flasks, test tubes) instrument - correct answers used to make measurements CAN NOT MAKE EXACT MEASUREMENTS uncertainty - correct answers it is in every measurement, and it also depends on the instrument used centimeters - correct answers used in measuring length grams - correct answers used in measuring mass liter - correct answers used in measuring volume Mass is: - correct answers the amount of matter an object has ...