Ms. Sawh’s Form 4 Chemistry Class Introduction to Chemistry WELCOME!
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Transcript of Ms. Sawh’s Form 4 Chemistry Class Introduction to Chemistry WELCOME!
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Ms. Sawh’s Form 4
Chemistry Class
Introduction to Chemistry WELCOME!
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What you will need•Notebook: a new one/Form 3 notebook•Textbook•Lab book: purchase in school•Goggles, lab coat, gloves (provided by
school)•Syllabus (available from Ms. Sawh)•Past Papers (available in
bookstores/school)•Access to Computer and my website: www.sawhcoolchem.weebly.com•An email address•Folder pages/manila folders
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Structure of the Syllabusand CSEC Exam
There are three major areas of Chemistry:•Physical Chemistry•Inorganic Chemistry•Organic ChemistryN.B. There is an Option Topic on Chemistry
in Everyday Life which changes every two years.
The CSEC Exam consists of three papers:•Paper I: 60 Multiple Choice Questions
(30%)•Paper II: 6 Structured/Extended Answer Questions, all compulsory
(50%)•Paper III: SBA (20%)
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School Based Assessment (SBA)You will be assessed in the following practical
skills in Form 4 and Form 5:•Manipulation/Measurement (M/M)•Observations/Recording/Reporting (O/R/R)•Analysis and Interpretation (A/I)•Planning and Designing (P/D)All these skills will be assessed by your teacher (at least twice) and written up using the proper
format in your lab books.An average of the marks awarded will be
calculated and submitted to CXC out of a total of 10 marks for each skill. So SBA mark will be out of a total of 80 marks.
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ChemistryWhat do you think the study of Chemistry
is about?Why are you studying Chemistry?Do you think Chemistry has any
relevance to your everyday life? Why?How is Chemistry different to any other
science e.g. Biology, Physics?
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Definition of Chemistry
•Chemistry is the study of matter and the behaviour
of particles in matter.
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MatterWhat is matter?
• Anything that has a mass and a volume
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States of MatterWhat are the states of matter?
Solid Liquid Gas Plasma
Close up view of atoms and their behavior
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• Changing from one state of matter to another is a Physical Change,
e.g. melting Give another example.
Physical vs. Chemical Change
• If a new substance is formed it is a
Chemical Change, e.g.Give another example.Images are from
http://www.chem4kids.com
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Kinetic Theory of Matter(Particulate Nature of Matter)
All Matter is made up of particles
•Name these particles.•How do we know these particles exist?•What evidence do we have that proves
matter is made up of particles?
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Processes that prove particles exist in matter
The particles that exist in matter are: atoms, molecules and ions. The evidence that proves these particles exist are:
•Diffusion•Osmosis•Brownian Motion•Write a definition of each and give examples.
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Pure and Impure Matter
Matter can be pure and impure.
How can we tell if a substance is pure?
Can you name any pure substances?
What are some impure substances?
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Pure substances
•Atoms•Elements•Molecules•Compounds
Can you write definitions for these pure substances and give examples?
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Atoms• Smallest indivisible
particles making up elements.
• The building blocks of Matter• Consists of Protons (+),
Electrons (-), and Neutrons (0).Elements• Consists of only one kind of atom, • Cannot be broken down into a simpler type of
substance by either physical or chemical means• Can exist as either atoms or molecules. • Give examples.
Images are from http://www.chem4kids.com
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Molecules
• A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together.
Give examples.
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Compounds
• Atoms of two or more different elements bound together.
• Can be separated into elements chemically, but not physically.
Give examples.
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SolutionsImpure Matter
• Solutions are groups of molecules that are mixed up in a completely even distribution.
• They can be homogeneous or heterogeneous.Homogeneous
• Uniform Distribution.• Example: Sugar and Water
Images are from http://www.chem4kids.com
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Solute
Solvent
• The substance to be dissolved.
• The one doing the dissolving.
To make a solution:
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Making a Solution
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Colloids• Particle sizes are in between the size of
particles found in solutions and suspensions .
• Can be mixed and remain evenly distributed without settling out.
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Mixtures
Heterogeneous
• They are substances (compounds,elements) held together by physical forces, not chemical.
• Can be separated physically.
• Solutions are also mixtures, but
can be heterogeneous.• The substances are not uniformly mixed.
• Example: Sand in a glass of water.Images are from http://www.chem4kids.com
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MixturesSuspensions• Are heterogeneous mixtures consisting of
parts that are visible to the naked eye.
Example: the ingredients in salad dressing
• Substances will settle over time.
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Matter
Mixtures
Homogeneous
Solution
Solvent Solution
Colloids
Heterogeneous
Suspensions
Pure Substances
Element Molecule
Compounds
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Questions
•How is a mixture different to a compound?
•How is a compound different to a molecule?
•How is an atom different to an element?
•Is a solution a pure substance?