Get premium membership and access questions with answers, video lessons as well as revision papers.
Solutions volumes should be carefully measured with a graduated cylinder. Add solution
completely, to a dry calorimeter. Don't forget to add the spin bar each time!
Set up the calorimeter with the thermometer (0° to 50°C, graduated every 0.1°C)
supported from a stand so that the bulb does not touch the bottom of the cup. Note that
the thermometer used for calorimetry differs from the less accurate one in your glassware
drawer. Clamp the calorimeter so that it rests on the stirrer. Be careful not to turn on the
heat or you will melt the Styrofoam.
The change in temperature is determined by measuring the initial temperature, T1, of the
reactants, and the maximum temperature, T2, of the contents of the calorimeter during the
exothermic reaction. Use a magnifying glass to measure temperature values precisely.
Interpolate between the divisions of the thermometer and record temperatures to +/- 0.01
°C. See your lab manual for a discussion of how to determine accurately the change in
temperature from your graph of temperature vs. time.
sharon kalunda answered the question on April 12, 2019 at 06:29
- Describe how a Calorimetry is used.(Solved)
Describe how a Calorimetry is used.
Date posted: April 12, 2019. Answers (1)
- Explain how an Analytical Balance is used.(Solved)
Explain how an Analytical Balance is used.
Date posted: April 12, 2019. Answers (1)
- Explain how a Pipette is used.(Solved)
Explain how a Pipette is used.
Date posted: April 12, 2019. Answers (1)
- Explain how graduated Cylinders are used.(Solved)
Explain how graduated Cylinders are used.
Date posted: April 12, 2019. Answers (1)
- Explain how a Volumetric (measuring) Flask is used.(Solved)
Explain how a Volumetric (measuring) Flask is used.
Date posted: April 12, 2019. Answers (1)
- Explain how a burette is used.(Solved)
Explain how a burette is used.
Date posted: April 12, 2019. Answers (1)
- Draw and name the apparatus used in the laboratory.(Solved)
Draw and name the apparatus used in the laboratory.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to demonstrate the purity of water using boiling point.(Solved)
Describe an experiment to demonstrate the purity of water using boiling point.
Date posted: April 11, 2019. Answers (1)
- State three examples of allotropes of carbon(Solved)
State three examples of allotropes of carbon.
Date posted: April 9, 2019. Answers (1)
- Define the following terms as used in chemistry: atom,molecule, element and compound(Solved)
Define the following terms as used in chemistry: atom,molecule, element and compound
Date posted: April 9, 2019. Answers (1)
- Describe how the mixture of sugar, iodine and lead (II) carbonate can be separated(Solved)
Describe how the mixture of sugar, iodine and lead (II) carbonate can be separated.
Date posted: April 9, 2019. Answers (1)
- Explain why elements in group eight are inert. Give one use of argon that depends on this characteristics . (Solved)
Explain why elements in group eight are inert. Give one use of argon that depends on this characteristics.
Date posted: April 3, 2019. Answers (1)
- Differentiate between oxidation and reduction. (Solved)
Differentiate between oxidation and reduction.
Date posted: April 3, 2019. Answers (1)
- Study the scheme below and answer the questions that follow.(Solved)
(a) Identify solid E.
(b) Write an ionic equation for the reaction in step II that produces solid F.
Date posted: April 1, 2019. Answers (1)
- Use the information in the table below to answer the questions that follow. (The letters do not
represent the actual symbols of the elements.(Solved)
Use the information in the table below to answer the questions that follow. (The letters do not
represent the actual symbols of the elements.
(a) Which two letters represent the same element ? Give a reason.
(b) Give the number of neutrons in an atom of element D.
Date posted: April 1, 2019. Answers (1)
- The diagram below shows an investigation on a property of ammonia gas.(Solved)
The diagram below shows an investigation on a property of ammonia gas.
(a) The platinum wire is observed to glow. Explain the cause of that observation.
(b) State the observations made when the rubber bang is removed.
Date posted: April 1, 2019. Answers (1)
- The molar masses of gases W and X are 16.0 and 44.0 respectively. If the rate of diffusion of W through porous material is 12cm3s-1....(Solved)
The molar masses of gases W and X are 16.0 and 44.0 respectively. If the rate of diffusion of W through porous material is 12cm3s-1. Calculate the rate of diffusion of X through the same material.
Date posted: April 1, 2019. Answers (1)
- Your lab technician noted that the reagent bottles of sodium carbonates, sodium chloride and sugar
have lost their labels. Your Chemistry teacher requested you to prepare...(Solved)
Your lab technician noted that the reagent bottles of sodium carbonates, sodium chloride and sugar
have lost their labels. Your Chemistry teacher requested you to prepare and test aqueous solutions of
each sample as shown below.
Complete the table by filling the correct label for each bottle.
Date posted: April 1, 2019. Answers (1)
- Imagine that you used the set up shown in the diagram below in order to study the reactions of some metals with steam. The experiment...(Solved)
Imagine that you used the set up shown in the diagram below in order to study the reactions of some metals with steam. The experiment was carried out for ten minutes.
(a) What observation would be made if gas F is ignited ?
(b) When the experiment was repeated using iron powder instead of magnesium ribbon
very little gas F was obtained.
(i) Give a reason for this observation.
(ii) What change in the conditions of the experiment should the student have made in
order to increase the volume of the gas F produced?
Date posted: April 1, 2019. Answers (1)
- The lattice energy of sodium bromide and hydration energies of sodium and bromide ions are:- 733, 406 and 335kJ/mol respectively.(Solved)
The lattice energy of sodium bromide and hydration energies of sodium and bromide ions are:- 733, 406 and 335kJ/mol respectively.
(i) Complete the energy cycle diagram below by inserting the values of changeH1, changeH2 and changeH3.
(ii) Determine the molar heat of solution of solid sodium bromide.
Date posted: April 1, 2019. Answers (1)