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Grade 9 Science – Unit 3 – Biology – Ecology

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Presentation on theme: "Grade 9 Science – Unit 3 – Biology – Ecology"— Presentation transcript:

Grade 9 Science – Unit 3 – Biology – Ecology

UNIT ONE: General Ecology and Population Part 1: Content Food Chains, Food Webs Energy Flow and Trophic Levels. Time: 5 days.

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What is the difference between how plants and humans get food? (Use a compound sentence with AND, BUT, or OR)

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Ecology Standards 6a. Know biodiversity is the sum total of different kinds of organisms & is affected by alterations of habitats 6b. Know how to analyze.

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Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu UNIT ONE: General Ecology and Population Part 1: Content Food Chains,

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The Biosphere. Warm Up April 17  What is a predator?  What is a herbivore?  What is a carnivore?

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PRINCIPALS OF ECOLOGY CHAPTER 3 BEGININIGS OF ECOLOGY ECOLOGY- SCIENTIFIC STUDY OF INTERACTIONS BETWEEN ORGANISMS AND THEIR ENVIRONMENTS ECOLOGY- SCIENTIFIC.

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Grade 9 Science – Unit 3 – Biology – Ecology EcologyCarbon CycleEnergy in Ecosystems DefinitionsMore Ecology

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grade 9 science

Grade 9 Science

Jul 24, 2014

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Grade 9 Science. Unit 1: Atoms, Elements, and Compounds. Grade 9 Science... Unit 1. Chapter 1: Atomic theory explains the composition and behaviour of matter. Lab Safety... A Review. Safety rules and procedures MUST be your top priority.

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Grade 9 Science Unit 1: Atoms, Elements, and Compounds

Grade 9 Science... Unit 1 Chapter 1: Atomic theory explains the composition and behaviour of matter.

Lab Safety... A Review • Safety rules and procedures MUST be your top priority. • Know them before you do the lab and use them while doing the lab.

Complete activity 1-1A pg. 9 Laboratory Safety

Safety Rules for the Science Labpages 10-11 • General • Glassware • Chemicals • Hot plates and open flames • Electrical equipment

WHMIS... Page 12 W workplace H hazardous M materials I information S system

Hazard Symbols... Page 13 Dangerous Container Dangerous Contents

Properties of Matter • Matter is anything that has mass and volume. • Mass is the amount of matter in a substance or object. • Volume is the amount of space a substance or object occupies.

Matter is made up of elements. • Elements are substances that contain one type of matter and cannot be broken down or separated into simpler substances.

Describing Matter 1. Physical Properties pg. 18 Characteristics of matter that are often observed or measured. Can be either qualitative (observed) or quantitative (measured).

Color • Malleability • Lustre • Conductivity • Boiling point • Melting point • Texture • Magnetism • Density

2. Chemical Properties pg. 19 Observed when substances react with each other. Determines a substances usefulness.

Reactivity • Combustibility

Core Lab Activity 1-2C pg. 20 Physical and Chemical Properties

Theory vs. Law • A law is better supported than a theory. • Most laws are supported by different and robust experimental evidence. • Theories can change or be modified • Laws rarely change

Atomic Theory

Atomic Theory • The descriptions of matter and how it behaves. • Has undergone many modifications as new facts became available.

An atom consists of a • nucleus • (of protonsand neutrons) • electrons in space about the nucleus

Inside the Atom

Early ideas... 2000 years ago • Empedocles: matter was composed of four “elements”; earth, air, wind, and fire.

460 BC • Democritus: eventually a substance will be cut into a piece that can no longer be cut. • He called this piece atomos.

Aristotle • All matter was composed of four elements • Earth, air, water and fire

Development of Atomic Theory • John Dalton - 1808 • He suggested that the particles that make up matter are like small, hard spheres that are different for different elements. • He defined an atom as the smallest particle of an element.

Dalton’s Model... Billiard Ball Model

J.J. Thomson - 1898 • He suggested that all atoms must contain electrons (negative charge). • His model pictured a positively charged ball with the negatively charged electrons embedded in it.

Thomson’s Model... Raisin Bun Model

Ernst Rutherford - 1910 • He discovered that atoms have a nucleus. • There are two kinds of particles in the nucleus; protons (positive charge) and neutrons (neutral).

Rutherford’s Model... Planetary Model

Rutherford was able to develop Thomson’s model due to the development of new technologies. (gold foil experiment) • The development of cyclotrons and proton accelerators have further developed the model accepted today.

Rutherford’s Experiment • they fired Helium nuclei at a piece of gold foil which was only a few atoms thick. Gold foil They found that while most of the helium nuclei passed through the foil, a small number were deflected and, to their surprise, some helium nuclei bounced straight back. Helium nuclei

Rutherford’s new evidence allowed him to propose a more detailed model with a central nucleus. • He suggested that the positive charge was all in a central nucleus. With this holding the electrons in place by electrical attraction • However, this was not the end of the story.

Niels Bohr - 1913 • He proposed that electrons surround the nucleus in specific energy levels or shells. • Each electron has a particular amount of energy.

Bohr’s Model... Orbital Model

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