Predict the number of valence electrons for a sulfur atom. a. 4 b. 6 c. 8 d. 16 e. 32 58. Predict the number of valence electrons for a chlorine atom.
Writing balanced molecular equations and net ionic equations. Acid-base reactions. Oxidation-Reduction reactions. Assigning oxidation numbers to elements in compounds and ions. Molarities of solutions and molar concentrations of ions.
Two ionic compounds often react so that the positive and negative ions change places. For example, AgNO3 and NaCl will react to form AgCl and NaNO3. Predict the results of the reaction between barium carbonate and magnesium sulfate. Write the formulas and the names of the reactants and products. 3.
Report the metals the patient has ingested. Are there any metals you can be sure he ingested? Why or why not? • In our experiment we determined three possible metals the patient could have ingested; Co2+,
The precipitate(s) for the above reaction is/are: A) Silver nitrate B) Aluminum bromide C) Silver bromide D) Aluminum nitrate E) There is no precipitate 18 – 37: For each of the two REDOX reactions below, perform the following: A) Balance the following equation and place the final answer in the boxes provided; show all work on the exam pages. B) Identify the oxidizing and reducing reagents. C) Assign the oxidation numbers to the elements in bold on both sides of the equation. D) Identify the oxidation and reduction half-reactions by placing LEO and GER, respectively, above the arrows in each half-reaction. E) NOTE that illegible writing will not be graded.
The first example is calculating empirical formulas from percent compositions using the percents of the different elements. Empirical formulas of compounds are also determined through quantitative analysis by using the masses of each element in the equation3. Lastly, this experiment uses the method of finding empirical formulas through combustion analysis. The empirical formula of magnesium oxide is found from the combustion of magnesium1. The four chemical equations that result when metal magnesium is heated in a closed crucible that becomes gradually exposed to the oxygen in the air are shown in table
d. The amplitude is 1 volt. 3. A PC NIC and a switch port create one electrical circuit to use when sending data from the PC to the switch. Which of the following tasks is a function done by the transmitter? (Choose two answers.)
Single Replacement Reaction Laboratory Modified from Glencoe Chemistry - Matter and Change, Glencoe McGraw-Hill, 2002 Objectives Observe a single replacement reaction Measure the masses of iron and copper Determine the mole ratios and the limiting reactant Chemicals Iron filings (Fe) – 20 mesh Copper(II) sulfate pentahydrate, (CuSO4·5H2O) Distilled water Materials Stir rod 100-mL beaker 250-mL beaker 25-mL graduated cylinder Weigh paper Balance Hot plate Beaker tongs Wire mesh insulated pad screen Distilled water wash bottles |Lab Data - Reaction of Copper(II) Sulfate and Iron | | Mass of empty 100-mL beaker |(g) | | | Mass of 100-mL beaker
8. Which pair of elements will form ionic compounds? A) sulfur and oxygen B) copper and iron C) iron and chlorine D) bromine and oxygen 9. Which ionic compound is formed when aluminum and sulfur combine? A) AlS B) Al 2 S 3 C) AlS 3 D) Al 2 S E) Al 3 S 2 10.
1. Equations for each reaction in the preparation. (a) Reaction of copper (II) oxide with nitric acid. CuO (s) + 2HNO3 (aq) → Cu(NO3)2 (aq) + H2O (l) (b) Neutralization of the excess nitric acid with sodium carbonate. Na2CO3 (s) + 2HNO3 (aq) → 2NaNO3 (aq) + CO2 (g) + H2O (l) (c) Reaction of aqueous copper(II) nitrate with sodium carbonate.