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How many tasks did you complete?
Which website was most helpful?
What is one new idea you learned today?
What are you still wondering about?

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Task 2

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Multiple-Choice Questions on Matter (with instant feedback)

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Watch First! Username & password are egsd114

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Task 9

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Determine if each is a physical or chemical change.

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Task 8

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MATTER AND ENERGY

2.3 - Physical and Chemical Changes

The changes matter undergoes are classified as either physical changes or chemical changes. A process in which a substance changes its physical form or appearance but not its basic composition is called a physical change. Can you name some physical changes?

Chemical changes are always changes in the composition and form of a substance. In a chemical change, matter is transformed completely into different materials and new substances are formed. The type of chemical changes that a substance can undergo are determined by its chemical properties. Can you name some chemical changes?

Section 3.4
Properties and Changes of Pure Substances ..p59

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MATTER AND ENERGY 2.3 - Physical and Chemical Changes The changes matter undergoes are classified as either physical changes or chemical changes. A process in which a substance changes its physical form or appearance but not its basic composition is called a physical change. Can you name some physical changes?

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Task 7

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Task 6

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Task 4

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anything that has mass and occupies space. Matter is sometimes called koinomatter (Gr. koinos =common) to distinguish it from antimatter, or matter composed of antiparticles

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Task 5

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States of Matter

Gases, liquids and solids are all made up of microscopic particles, but the behaviors of these particles differ in the three phases. The following figure illustrates the microscopic differences.

Microscopic view of a gas.

Microscopic view of a liquid.

Microscopic view of a solid.

Note that:

Particles in a:

gas are well separated with no regular arrangement.

liquid are close together with no regular arrangement.

solid are tightly packed, usually in a regular pattern.

Particles in a:

gas vibrate and move freely at high speeds.

liquid vibrate, move about, and slide past each other.

solid vibrate (jiggle) but generally do not move from place to place.

Liquids and solids are often referred to as condensed phases because the particles are very close together.
The following table summarizes properties of gases, liquids, and solids and identifies the microscopic behavior responsible for each property.

Some Characteristics of Gases, Liquids and Solids and the Microscopic Explanation for the Behavior

gas liquid solid

assumes the shape and volume of its container
particles can move past one another

assumes the shape of the part of the container which it occupies
particles can move/slide past one another

retains a fixed volume and shape
rigid - particles locked into place

compressible
lots of free space between particles

not easily compressible
little free space between particles

not easily compressible
little free space between particles

flows easily
particles can move past one another

flows easily
particles can move/slide past one another

does not flow easily
rigid - particles cannot move/slide past one another

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States of Matter Gases, liquids and solids are all made up of microscopic particles, but the behaviors of these particles differ in the three phases. The following figure illustrates the microscopic differences. Microscopic view of a gas. Microscopic view of a liquid. Microscopic view of a solid.

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Task 3

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Chem4Kids.com! This tutorial introduces states of matter. Other sections include elements, the periodic table, reactions, and biochemistry.