*NEED HELP ANSWERING 1, 2 AND 3 IN THE CONCLUSION!* Short Answer Chemical Reacti
ID: 971635 • Letter: #
Question
*NEED HELP ANSWERING 1, 2 AND 3 IN THE CONCLUSION!*
Short Answer
Chemical Reaction Types and Their Equations
Experiment 1: Perform a Synthesis Reaction
Lab Results
Record the following values in the table below.
Data Analysis
Record the following values in the table below.
Where did the extra mass come from? (Hint: The final product is magnesium oxide)
Assuming all the magnesium reacted in the reaction, what is the total mass of product formed?
Experiment 2: Perform a Decomposition Reaction
Data Analysis
What was the change in mass of the contents in the crucible? Compare the mass after heating to the mass before heating.
The color change of the copper (II) carbonate hydroxide hydrate as it was heated can help identify the product. Use the following list of copper compounds to identify the product.
CuCO3 - light green powder
Cu(OH)2 - blue green powder
Cu2O - reddish brown crystals
CuO - black powder
Given that mass was lost from the copper (II) carbonate hydroxide hydrate during heating, in this decomposition reaction, how many moles of solid product were produced? The molar mass of the solid product is 79.545 g/mol (number of moles = mass (g) / molar mass (g/mol)).
(3.327 g CuO) x [(1 mole CuO)/(79.545 g CuO)] = 0.04183 moles CuO
Copper carbonate hydrate produces 1 mole of water (MM = 18.015 g/mol) for every mole of solid product (MM = 79.545 g/mol) produced. Given that 3.327 g of solid product were produced during the reaction, how many grams of water were released as water vapor? (number of moles = mass (g)/ molar mass (g/mol)).
Experiment 3: Peform a Single Displacement Reaction
Lab Results
What observations did you make when the hydrochloric acid and zinc were combined?
temperature went up to 26.3C and pressure went up to 1.71atm and the substance bubbled for a couple seconds
Data Analysis
What do these observations tell you about this single displacement reaction?
gas evolution, which means that reaction takes place
Experiment 4: Perform a Double Displacement Reaction
Lab Results
Describe what happens when solutions of NaOH and NiCl2 are combined.
When Nickel Chloride (6ml) was added to (15ml) of sodium hydroxide- the milky substance remained the same but the nickel chloride turn to a small solid lime green ball.
Data Analysis
What ions are present in an aqueous solution of NiCl2?
Ni2+(aq) and Cl-(aq)
What ions are present in an aqueous solution of NaOH?
Na+(aq) and OH-(aq
Conclusions
Write a balanced equation for the synthesis reaction that occurred.
Write a balanced equation for the decomposition reaction that occurred.
(a) mass of empty crucible (g) 88g (b) mass of crucible and Mg (g) before heating 93gExplanation / Answer
Where did the extra mass come from? (Hint: The final product is magnesium oxide)
Assuming all the magnesium reacted in the reaction, what is the total mass of product formed?
in rection (93 -88 ) = 5 gm magnesium is used. molecular weihgt of magnesium is 24 gm and molecular weight of magnesium oxide is 40 gm
now reaction is 2Mg + O2 = 2MgO
as a result of that
from (2* 24 ) gm = 48 gm magnesium 80 gm magnesium oxide is fromed
5 gm magnesium = ( 80/48 ) * 5 = 8.333 gm
since magnesium oxide is fromed so weihgt increase.Related Questions
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