atoms and molecules.
Atomic and molecular masses. Mole concept and molar mass; percentage composition and empirical
and molecular formula; chemical reactions, stoichiometry and calculations based on stoichiometry.
Unit II: Structure of Atom (Periods 16)
Discovery of electron, proton and neutron; atomic...
Acid and Base Lab:
Measuring p H of Household and Food Products Name_______________ Date_______________
A liquid may be an acid, base, or neutral.
The degree of acidity or basicity can be measured...
flames as it is flammable. Handle acids and bases carefully as they are
corrosive. Rinse skin with lots of cool water if splashed with chemical and report
any spills to the teacher immediately.
Source: Nelson Chemistry 11 (2010)
ACID BASE TITRATION
Purpose: To determine...
metal one degree Celsius.
Latent heat of fusion of water – the energy required to convert one gram of ice at 0 0C to one gram of water at 0 0C.
Heat of solution of a salt – the energy involved in dissolving one gram of a solid in water.
Heat of a reaction – the energy gained or lost in the chemical process
7 0 8 1
Examiner’s use only
London Examinations GCE
Ordinary Level Paper 2
Monday 19 January 2009 – Morning Time: 2 hours
Team Leader’s use only
Question Leave Number Blank
1 2 3 4 5
Materials required for examination...
Analysis of Antacid Tablets
An acid-base titration is a method of neutralizing strong acids. Unbeknownst to many, acid-base titrations occur on a daily basis. Our stomachs useacid to help us digest our food – approximately .155 hydrochloric acid...
So how do you find the electron configuration? Well let’s use potassium (K) as an example.
Look up the atomic number of potassium. It should say 19. This tells you the number of protons, which is equal to the number of electrons so we can use that.
Arrange the electrons in shells, always filling...
for Synthesis of Benzoic Acid
155:416 Process Laboratory II
Professor Jerry Sheinbeim
January 28 – February 28, 2014
The observed reaction that took place in this experiment...
Na = Avogadroës Number = 6.02 x 1023
The mole is important because:
It allows us to weigh atoms in the lab.
It allows us to compare amounts of atoms in chemical reactions.
Basic mole calculations: convert mass to moles, and moles to molecules or atoms.
These equalities are used in...
marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the report on the examination.
CIE will not enter into discussions or correspondence in connection with these mark schemes.
CIE is publishing the mark...
Aqueous Solutions Reactions, Metathesis (Double Replacement) Reactions and Net Ionic Equations
India’s cultural treasure and biggest tourist attraction is slowly losing its magnificent appeal due to decades of acid rain. The walls of the Taj Muhal are composed of a...
Observation of Chemical Changes
In this experiment, the student studied the composition of materials in a setting where the indications of chemical changes were safely observed. The changes observed consisted of bubble formation, colors, viscosity, and precipitate formation.
the molar concentration of a strong acid
– Through titration
• Need reproducible results
– 3 trials are performed (3 titrations)
• Accuracy is important
• The concentration of a sodiumhydroxide will be
determined by titration with...
specific to that particular element?
The alkali metal, sodium, positioned in group 1, period 2, was first discovered in 1807 by Humphrey Davy by electrolysis of molten sodiumhydroxide.
The element has been named as sodium by Davy, due to the use of caustic soda as his source of the element.(1)
of it in a washed titration flask. 2. Rinse and fill the burette with the given KMn04 solution. 3. Add one test-tube (15 ml) full of dilute sulphuric acid (2 N) to the solution in the titration flask. 4. Note the initial reading of the burette. 5. Add KMn04 solution from the burette till a permanent light...
Classifying Chemical ReactionsLab
The purpose of this lab is to observe a wide range of different chemical reactions and to classify patterns in the conversion of reactants into products. The properties of the reactions will be identified to distinguish the chemical...
Copper (II) Nitrate
Objectives: Students should be able to…
recognize evidence(s) of a chemical change
convert word equations into formula equations
perform a series of chemical reactions in order to recycle the element copper
determine the percent recovery of elemental copper
acidity. They are used to relieve acid indigestion, upset stomach, sour stomach, and heartburn.
Antacids perform a neutralization reaction, i.e. they buffer gastric acid, raising the pH to reduce acidity in the stomach. When gastric hydrochloricacid reaches the nerves in the gastrointestinal...