Two experiments are performed as described below: i. Aluminum foil (Al) is placed into a solution of nickel(II) chloride. ii. A piece of gold metal (Au) was added to an aqueous solution of Zn(NO3)2. In which experiment does a reaction occur, and in which experiment does a reaction not occur?

How could you have used the color change property of iron(III) chloride to monitor when the reaction had reached completion? You could have added drops of iron(III) chloride directly to the reaction mixture until a change in color occurred. You could have placed a drop of iron(III) chloride directly to the reaction mixture and waited until the color disappeared. You could have placed a drop of reaction mixture every minute in one test tube containing iron(III) chloride until there was no color change. You could have placed a drop of reaction mixture into different test tubes containing iron(III) chloride every minute until there was no color change. Incorrect

Draw the major organic product of the reaction shown. CH3CH₂OH HCI (CH3)2CHCHCO₂ + NH3

Imagine you were working as a laboratory technician and your principal investigator asked you to develop Benedict’s test into a quantitative measure of the concentration of reducing sugar in a solution. To do this, you would first need to decide what to measure and then establish the relationship between your measurements and different concentrations of reducing sugars. Explain generally what you would decide to measure and how you would go about determining the relationship of your measurements to the concentration of reducing sugar.

3. For each reaction below, (f) write a balanced reaction equation, including proper state symbols, and (ii) name the type of reaction that occurs. Note: More than one type of reaction may apply to the same reaction equation. a. zinc metal reacts with aqueous copper(II) sulfate to form copper metal and aqueous zinc(II) sulfate b. aqueous sodium sulfide and aqueous lead(II) acetate form aqueous sodium acetate and solid lead(II) sulfide C. solid sodium bicarbonate is heated to form carbon dioxide gas, liquid water, and solid sodium carbonate d. solid magnesium and diatomic nitrogen gas react to form solid magnesium nitride e. sulfuric acid and aqueous potassium hydroxide react to form aqueous potassium sulfate and liqud water

Paraffin wax vapor reacts with oxygen gas to form carbon dioxide gas and water vapor. Paraffin wax is a mixture of hydrocarbons having a general chemical formula of CnH2n+2 where n is at least 16. Assume that for this wax n=30 1. Write the symbolic form of this chemical reaction. 2. Classify this chemical reaction and write the general form of this type of reaction. 3. If the wax is a solid at room temperature, why does the reaction state that it is a gas? 4. Explain why the reaction stopped after the glass was placed over the candle. 5. Explain what was on the inside surface of the glass and where it came from.

6. Sodium sulfide reacts with hydrochloric acid to produce hydrogen sulfide and sodium chloride. How many grams of sodium sulfide are required for complete reaction with 15.0 mL of 0.250 M hydrochloric acid? The molar mass of sodium sulfide is 78.046 g/mol. (Hint: start by writing the balanced equation for the reaction.)

4. A student has an unknown solution. She knows that the solution could be NaCl(aq), Mg(NO3)2(aq) or Ca(NO3)2. When a solution of silver nitrate was added to her unknown, there was no reaction. When a solution of sodium sulfate was added to her unknown, a white precipitate appeared. What is her solution? Explain your reasoning and write the molecular equation for the reaction that produced the precipitate.

Specify which of the following are oxidation-reduction reactions, and if it is, identify the oxidizing agent, the reducing agent, the substance being oxidized, and the substance being reduced. If it is not, select No and leave the following boxes blank. Express your answers as chemical formulas. Omit states-of-matter. a. CH4 (9) + H2 O(g) → CO(9) + 3H2 (9) Redox? Oxidizing Agent Reducing Agent Substance Oxidized Substance Reduced Yes v b. 2AGNO3 (ag) + Zn(s) → Zn(NO3)2 (aq) + 2Ag(s) Redox? Oxidizing Agent Reducing Agent Substance Oxidized Substance Reduced No v

Cobalt(II) chloride solution reacts with sodium hydroxide solution. Identity the spectator ion(s). Note: you may choose more than one answer. O Co2+ Na OH