Name: ___________________________________ Date: ______________ Practice Test #3 ____ 1. When a precipitation reaction occurs, the ions that do not form the precipitate A) evaporate B) are cations only C) form a second insoluble compound in the solution D) are left dissolved in the solution E) none of these 2. An aqueous solution of potassium chloride is mixed with an aqueous solution of sodium nitrate. The complete ionic equation contains which of the following species (when balanced in standard form)? A) B) C) D) E) ____ 3.
a. alkali metals b. alkaline earth metals c. halogens d. noble gases e. none of the above 3. What is the collective term for the elements in Groups 1, 2, 13-18? a. actinide series b. lanthanide series c. rare earth elements d. representative elements e. transition elements 4. What is the collective term for the elements in Groups 3-12? a. actinide series b. lanthanide series
D) It conducts electricity when dissolved in water. E) none of the above 4. In a Lewis dot structure the electrons which complete an octet but are not located between two atoms are referred to as A) bonding pairs. B) delta minus electrons. C) excess electrons.
CH3+ | A) | only I | B) | only II | C) | I and II | D) | II and III | 11. | The electron pair movement depicted below produces a second resonance form for the species. What is the formal charge on the nitrogen atom for this second resonance form? | A) | -2 | B) | -1 | C) | 0 | D) | +1 | 12. | What
The distance between the forces is given by the Coulombs law through the use of the formula F=kq1q2/r2.0.1newtons = 8.99*109*3.2*10-6*7.7*10-7/r2 R= 555.78 Answer to question 3 • Potential difference between the two plates is equal to velocity which is equal to 6.0*106m/s • Force = mass *acceleration = 1.4*10-13*6.0*106 = -8254 nektons The speed of the particles are computed by the formula V=ED. This is equal to 8.5*10-6*0.15. This is equal to 84.1 Answer to question 4 Voltage = current *resistance. This implies that in this case while V is 5.0 and resistance is 1.0*103, current will be equal to 5/1.0*103, = 500 amps B the direction of the conventional current provides the electric charge movement from the positive side of the battery to its negative side as in indicated in the diagram below Answer to question 5 • This section focuses on the equivalent resistance of a circuit. The equivalent resistance will be equal to (5.0*102+1.00*103)2.
4) When naming an ionic compound, which ion is given first? The metal ion is named first 5) Give explanations for the following: a. Argon will not react with any other element It already has a complete number of eight, a full number in its valance shell so it cannot react with itself or another element b. The reaction between sodium chloride gives out a lot of heat and light. The chemical energy of the product is less then the chemical energy of the reactants. This energy is indestructible and is converted to light and heat.
d. Their values get larger as the temperature is increased. e. An order equal to zero means there is no concentration dependence with rate. 2. The gas phase reaction A + B C has a reaction rate which is experimentally observed to follow the relationship rate = k[A]2[B]. The overall order of the reaction a. is first.
B) Greenhouse gases prevent heat from leaving the earth. C) If the level of greenhouse gases increases, the temperature will decrease. D) Some greenhouses gases are needed to keep the proper temperature balance. E) none of the above 3) Which of the following is TRUE? A) Stoichiometry allows prediction of the amounts of products that form in a chemical reaction based on the amounts of reactants.
Atoms and Ions Atoms have no net charge. They are neutral. Ions have a charge, either positive or negative. A positive ion has more protons than electrons. CATION A negative ion has more electrons than protons.
12 C. 5 D. 30 _____ 16. A voltaic cell has E0cell = +1.00 V. The cell reaction A. is not spontaneous B. has K = 1 C. has (G0 = 0 D. has a negative (G0 _____ 17. Which energy conversion takes place in a galvanic cell? A. electrical to chemical B. chemical to