South CHM1020 Week 5 Lab Assignment

Question # 00620185
Course Code : CHM1020
Subject: Chemistry
Due on: 12/05/2020
Posted On: 12/05/2020 05:06 AM
Tutorials: 1
Rating:
4.9/5
Question Dot Image

CHM120 General Chemistry I Lab

Week 5 LAB Assignment

Part A

Objective

                In today’s lab, we will demonstrate a few different types of chemical reactions and be able to observe whether a chemical reaction has taken place.  We will also learn how to use chemical equations to describe chemical reactions.

Background/Theory

The Periodic Table shows over 100 elements. The chemical literature describes millions of compounds that are known—some isolated from natural sources, some synthesized by laboratory workers. The combination of chemicals, in the natural environment or the laboratory setting, involves chemical reactions. The change in the way that matter is composed is a chemical reaction, a process wherein reactants (or starting materials) are converted into products. The new products often have properties and characteristics that are entirely different from those of the starting materials.

Four ways in which chemical reactions may be classified are combination, decomposition, single replacement (substitution), and double replacement (metathesis).

Two elements reacting to form a compound is a combination reaction. This process may be described by the general formula:

A + B ? AB

The rusting of iron or the combination of iron and sulfur are good examples.

4Fe(s)+3O2(g) ?2Fe2O3(s)(rust)

Fe(s)+S(s) ?FeS(s)

Two compounds reacting together as in the example below also is a combination reaction.

CaO(s) +CO2(g) ?CaCO3(s)

A compound which breaks down into elements or simpler components typifies thedecomposition reaction. This reaction has the general formula:

AB ? A + B

Some examples of this type of reaction are the electrolysis of water into hydrogen and oxygen:

2H2O(l) ?2H2(g) +O2(g)

andthedecompositionofpotassiumiodateintopotassiumiodideandoxygen:

2KIO3(s)?2KI(s)+3O2(g)

The replacement of one component in a compound by another describes the singlereplacement(or substitution) reaction. This reaction has the general formula:

AB + C ?CB + A

Processes which involve oxidation (the loss of electrons or the gain of relative positive charge) and reduction (the gain of electrons or the loss of relative positive charge) are typical of these reactions. Use of Table 1, the activity series of common metals, enables chemists to predict which oxidation-reduction reactions are possible. A more active metal, one higher in the table, is able to displace a less active metal, one listed lower in the table, from its aqueous salt. Thus aluminum metal displaces copper metal from an aqueous solution of copper(II) chloride; but copper metal will not displace aluminum from an aqueous solution of aluminum(III) chloride.

2Al(s) +3CuCl2(aq) ?3Cu(s) +2AlCl3(aq)

Cu(s) + AlCl3(aq) ?No Reaction

(Note that Al is oxidized to Al3+ and Cu2+ is reduced to Cu.)

Hydrogen may be displaced from water by a very active metal. Alkali metals are particularly reactive with water, and the reaction of sodium with water often is exothermic enough to ignite the hydrogen gas released.

2Na(s) + 2HOH(l) ?2NaOH(aq) + H2(g) + heat

(Note that Na is oxidized to Na+ and H+ is reduced to H2.)

Active metals, those above hydrogen in the series, are capable of displacing hydrogen from aqueous mineral acids such as HCl or H2SO4; however, metals below hydrogen will not replace hydrogen. Thus zinc reacts with aqueous solutions of HCl and H2SO4 to release hydrogen gas, but copper will not.

Zn(s)+2HCl(aq)?ZnCl2(aq)+H2(g) Cu(s)+H2SO4(aq)?Noreaction

Two compounds reacting with each other to form two different compounds describes double replacement reactions.  This process has the general formula:

AB+CD?AD+CB

There are two replacements in the sense that A replaces C in CD and C replaces A in AB. This type of reaction generally involves ions which form in solution either from the dissociation of ionic compounds or the ionization of molecular compounds. The reaction of an aqueous solution of silver nitrate with an aqueous solution of sodium chloride is a good example. The products are sodium nitrate and silver chloride. We know a reaction has taken place since the insoluble precipitate silver chloride forms and separates from solution.

AgNO3(aq) +NaCl(aq) ?NaNO3(aq) +AgCl(s) (White precipitate)

In general, a double replacement results if one combination of ions leads to a precipitate, a gas or an un-ionized or very slightly ionized species such as water. In all of these reaction classes, it is very often possible to use your physical senses to observe whether a chemical reaction has occurred. The qualitative criteria may involve the formation of a gaseous product, the formation of a precipitate, a change in color, or a transfer of energy.

In the next section, you will practice identifying which of the four classes or classification of chemical reactions mentioned above does each chemical reaction represent.  Note, in addition to combination, decomposition, single replacement and double replacement reactions, we also have combustion reactions, which you will explore in later assignments.  For now, each reaction listed will fall into one of the four categories described here.

Practice determining reaction classification

For each of the reactions below, classify as a combination, decomposition, single replacement, or double replacement.

                Ca(s)+Cl2(g)?CaCl2(s)

                2Cu(s) + O2(g)?2CuO(s)

                Ca(NO3)2(aq)+H2SO4(aq)?2HNO3(aq)+CaSO4(s)

                NH3(aq)+HCl(aq)  ?NH4Cl(aq)

                Hg(NO3)2(aq)+2NaI(aq)?HgI2(s)+2NaNO3(aq)              

                AgNO3(aq)+NaCl(aq)?AgCl(s)+NaNO3(aq)      

                Zn(s)+H2SO4(aq)?ZnSO4(aq)+H2(g)   

                H2CO3(aq)?CO2(g)+H2O(l)     

                2H2O(l)?2H2(g)+2O2(g)            

                2Li(s)+2H2O(l)?2LiOH(aq)+H2(g)           

Procedure for Experiments

Combination/Synthesis Reactions

Watch the following Video: https://www.youtube.com/watch?v=w2ydd9rJHws

                For the reaction of magnesium and atmospheric (diatomic) oxygen write out the balanced chemical equation:

                Next describe what magnesium metal looks like, and what the product identified above looks like.  For example, was the magnesium reactant shiny or dull, was it malleable or brittle?

Decomposition Reaction

Watch the following video: https://www.youtube.com/watch?v=_Y1alDuXm6A

                Write out the balanced chemical equation for the thermal decomposition of Mercury oxide:

                What did the Mercury (II) oxide reactant look like, and what did the products of the decomposition reaction look like?

How do we know the gas released was oxygen?

Single Displacement Reaction

Watch the following video: https://www.youtube.com/watch?v=k8UtR7akNec

                Write out the balanced chemical equation for single replacement reaction of silver nitrate and copper:

                Describe your observation, and clearly identify the appears of reactants and products.

Double Displacement Reaction

Watch the following video: https://www.youtube.com/watch?v=X2mB-q2NQXY

                Write out the balanced chemical equation for the double replacement reaction of lead nitrate and potassium iodide:

                Describe the color of each aqueous solution of reactants lead nitrate and potassium iodide:

                Describe the color and state of each product (note, there are two products you will need to describe the color and state of).  Recall, by “state” we mean aqueous (aq), gas (g), liquid (l), and solid (s). 

Week 5 Assignment – Part B

1.  Balance the following chemical equation:

___FeBr3+___H2SO4?___Fe2SO43+___HBr

2.  Balance the following chemical equation:

___C7H16+___O2?___CO2+___H2O

3. What is the formula weight (in amu) for ammonia, NH3?

4.  How many molecules are present in one mole of water, H2O?  Express your answer in scientific notation.

5. A person drinks 1.50 × 103 g of water, H2O, per day. How many moles is this?

6.  How many grams of CH3OH are in 0.42 mol CH3OH

6.  The balanced equation N2g+3H2(g)?2NH3(g)  means which of the following?

  1. One gram of nitrogen reacts with three grams of hydrogen to form two grams of ammonia
  2. One mole of nitrogen reacts with three moles of hydrogen to form two moles of ammonia
  3. The equation means both a and b
  4. The equation means neither a nor b

7.  Most of the industrial ammonia today is produced via the Haber Process.  The Chemical reaction is one we’ve seen many times now:

N2g+3H2(g)?2NH3(g)

If 20 moles of ammonia (NH3 ) are needed for a particular process, how many moles of diatomic Nitrogen (N2 ) are needed?

Practice with Stoichiometry Calculations – Problem Solving Workflow:

 

8.  How many grams of H2 are required to produce 7.50 grams of ammonia NH3?  Use the balanced equation (this time the equation is already balanced):

N2g+3H2g?2NH3(g)

 

9.  If 54.7 grams of propane (C3H8) and 89.6 grams of oxygen (O2) are available in the balanced combustion reaction below:

C3H8+5O2?3CO2+4H2O

a) Which reactant is limiting (show your work)?

b)  What is the theoretical yield of CO2  in grams?

 

 

Dot Image
expertguy Posted By :
Questions: 34513 Tutorials: 33884
Tutorials for this Question

South CHM1020 Week 5 Lab Assignment

Tutorial # 00618876
Posted On: 12/05/2020 05:30 AM
Feedback Score: Not rated yet!
Purchased By: 2
expertguy
Posted By:
Questions:
34513
Tutorials:
33884
Report this Tutorial as Inappropriate
Tutorial Preview
The solution of South CHM1020 Week 5 Lab Assignment...
Attachments
LAB_5_Assignment.docx (109.51 KB)
LAB_5_Assignment_1.PDF (1653.79 KB)

Great! We have found the solution of this question!

Related Questions
South CHM1020 Week 9 Lab Assignment
CHM120 General Chemistry I Lab Week 9 LAB Assignment Lab 9 Assignment Review of acids/bases and acid-base neutralization: https://www.youtube.com/watch?v=n9wUdgxCLMQ 1.   & …
South CHM1020 Week 8 Lab Assignment
CHM120 General Chemistry I Lab Week 8 LAB Assignment Solubility (Fill in the blank/Short answer) (See CHM 1010 for Solubility Course Material)          …
South CHM1020 Week 3 Lab Assignment
Week 3 Assignment 1.            Classify each example of molecular art as a compound or element.  Moreover, where applicable, specify whi …
South CHM1020 Week 7 Lab Assignment
CHM120 General Chemistry I Lab Week 7 LAB Assignment Week 7 Assignment A.            Watch Boyle’s Law and answer questions perta …
South CHM1020 Week 6 Lab Assignment
CHM120 General Chemistry I Lab Week 6 LAB Assignment Week 6 Assignment – Part A Multiple Choice: 1) The law of conservation of energy states that ________. A) the energy of the r …
South CHM1020 Week 5 Lab Assignment
CHM120 General Chemistry I Lab Week 5 LAB Assignment Part A Objective                 In today’s lab, we w …
South CHM1020 Week 4 Lab Assignment
Week 4 Assignmenta, b, and c Atomic Structure, Chemical Bonding, Lewis Structure, and 3D Molecular Shape Objectives In this lab, you will apply valence bond theory to draw appropriate Lewis s …
Recent Questions
How do people learn in later years and what type of educational
How do people learn in later years and what type of educational activities can be offered to aging individuals? In this assignment, you will write a brief article suitable for use in a fictional onlin …
Counselling Deaf Clients in Canada - Socio-cultural and demographic
Counselling Deaf Clients in Canada. A. Socio-cultural and demographic background - In this section, include descriptive information about the specific cultural group that you have researched, such …
Project One Planning Document First Draft
Project One Planning Document First Draft Overview You have identified an issue in the natural sciences and developed an  initial research question. In Modules Three and Four, you will prac …
Psychology - Describe the schema you might form about
Psychology Question Assignment #1: Schemas. Visit www.amazon.com and find a product that is of interest to you. Read two conflicting reviews for the product. 1) Describe the schema you might for …
PSYC450 Family Systems Theoretical Analysis
PSYC 450 Family Systems Theoretical Analysis Create a 12-15 narrated presentation about Theoretical Analysis in family systems. Each slide requires 1-2 minutes of voice narration. You have to add A …
HUS320 Final Project: Crisis Intervention Plan and Reflection
HUS 320: Final Project: Crisis Intervention Plan and Reflection Learning Objectives: Design Comprehensive Crisis Plans Task: Imagine a complex crisis scenario (for example, a community affected by …
Psychology - One of the more controversial issues
Psychology Central Texas College One of the more controversial issues in the study of psychology has been the mind-body problem. Consequently, scholars have argued for a very long time about how th …
Psychology - Ethical Appropiateness, Do you believe testing
Psychology: Ethical Appropiateness Respond to the following  1. Do you believe testing can be conducted in a fair and unbiased manner? Why or why not? 2. What are factors that need to be c …
Personality Theories in the Psychodynamic Tradition
Personality Theories in the Psychodynamic Tradition [ Before beginning work on this discussion, read the chapter in your textbook that coincides with your assigned theorist (below). In addition, re …
Psychology - Summarize the key assumptions and assertions
Psychology Question This assignment is intended to prompt you to examine the ways in which gender-based attitudes and beliefs affect support for specific social policies. You will continue to exami …