Review the table below for confirming 3 common gases. The products of the reaction were solid copper and aqueous zinc sulfate. Black Copper Oxide precipitate formed and water formed.
Note the net-ionic version would be identical to the molecular formula since the reaction does not occur in solution. Note that the activity of a given element is most easily predicted with an "activity series". Jay Create your own unique website with customizable templates. After the lab was finished, the final mass of the copper was 6.
Disposal The copper solution may be disposed of at the sink in most communities. Precautions Wear safety goggles and lab apron; silver nitrate will stain clothes and skin. What indicated that a chemical reaction took place when zinc and hydrochloric acid were combined?
No reaction was noticed when placed in a solution of calcium nitrate. Unfortunately, that was not the case in this lab, and the final mass of copper exceeded the initial mass by 4. Concentrated nitric acid used in the recovery process is corrosive. The drop bottles contained different compounds which were dropped into the spot plates and mixed together.
The error in this step was caused by the variable heating of the solution to prevent bubbling of the solution. Part A — zinc sulfate Complete and balance the chemical equations below that represent the chemical reactions, which took place: Write a balanced equation for the reaction using the mole ratio derived above as the coefficients.
Write a balanced equation for this decomposition reaction. For example, Silver ions are soluble with Fluoride ions, which would only create an aqueous solution, and the presence of silver ions would not be as evident as they would be if they were paired with Bromide Ions.
Otherwise the solution will have a blue tinge Filter and wash. Hydrogen gas is also formed and released. Throughout the entirety of the lab, there were many steps that presented possible sources of error such as adding too much or too little of a compound to the copper solution, or the loss of copper during transport or by being left on the stirring rod.
When zinc and hydrochloric acid were combined, zinc turned black and hydrogen bubbles were released. Clearly these values are not the same as hypothesized, due to a variety of sources of error throughout the lab.
Soak a steel wool pad in 30 mL of vinegar in a mL beaker. The solution should contain copper ions as the reaction proceeds, which means it will turn blue. The yeast contains the enzyme catalase that decomposes hydrogen peroxide. The more "active" element i. Measure room temperature and record: If the flame is extinguished, the test is positive.
Furthermore, they are both able to react with hydrochloric acid but not with calcium nitrate. Waste silver is acutely hazardous. Record the final temperature of the steel wool: A fine copper wire might not provide enough copper metal to react with all of the silver. A metal was found in the lab that was missing its labeling tape.
During the lab, each participant was given drop bottles, spot plates. Sources of Error According to the Law of Conservation of Mass, the mass of the products must equal the mass of the reactants, so logically one would expect that if 2 g of copper was used to start the lab, the lab would result in 2 g of copper.
Observations such as zinc turning black soon after being placed in water indicated that a chemical reaction had taken place. So then how could the final mass possibly be larger than the initial mass? Silver formed during the experiment should be recycled for qualitative use as silver nitrate by using the following procedure: The percent yield of copper calculated was Silver metal does not react with skin.Chemistry Lab Quiz.
STUDY. PLAY. Chemical Reactions Lab purpose. single replacement Fe + 2HCl → FeCl₂ + H₂ Write the balanced equation for the reaction that occurs between magnesium and hydrochloric acid?
Mg + 2 HCl → MgCl₂ + H₂. dilute hydrochloric acid to show single-replacement reactions and construct an activity series. LAB LABORATORY MANUAL Pre-Lab 1.
What is a single-replacement reaction? 2. Explain what determines the reactivity of a metal. 3. Distinguish between a more active metal and a If no reaction was observed, write no reaction.
2. Single Replacement Reactions Lab Unit 3: Chemical ReactionsPurpose: The purpose of this activity is to determine which metals are most reactive and to create an order from most reactive to least reactive.
In this lab you will be performing several experiments. For each one you will be expected to write an equation and indicate the type of reaction (composition, decomposition, single replacement, or double replacement).
Typically, you will be given the left-hand (reactant side) and asked to provide the products to the reaction. You need to be able to recognize single replacement reactions AND be able to break a formula apart into proper cations and anions as well as write correct formulas.
The reaction of Al with HCl is classified both as a single replacement reaction as well as a redox reaction, but there are redox reactions that are not single replacement reactions.
For example, when one lights a gas burner, methane in natural gas reacts with molecular.Download