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3rd Grade Part Two Review
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Model A representation or example of an object or system in the real world
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Physical Property Anything that you can observe about an object by using your senses Color Shape Texture Size
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Physical Properties
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Matter Anything that has mass and takes up space
The smallest particle of matter One atom of many
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States of Matter Solids Liquids Gases
Particles are close together with little room to move. Solids Particles have room to slide past each other. Liquids Particles have lots of room to move around. Gases
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Properties of Matter
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Temperature Temperature is measured with a thermometer.
Measured in °C (degrees Celsius) Freezing Point of Water = 0°C Boiling Point of Water = 100°C 0° 100°
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The volume of the liquid in the beaker is 200 mL.
The amount of space that matter takes up
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Measuring Volume Tools – graduated cylinder, beaker
Units – mL – milliliter L – liter
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Mixtures Two or more substances are mixed
Can be separated in different ways: magnet, strainer, or heat
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Energy The ability to cause change The ability to do work
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Forms of Energy Mechanical Thermal (Heat) Light Sound
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Mechanical Energy Energy in motion
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Heat The movement of thermal energy from one place to another
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Thermal Energy As thermal energy is removed, particles slow down. A gas turns to a liquid and a liquid turns into a solid. Heat energy that moves the particles in matter When thermal energy is added, particles move faster. A solid begins to melt and a liquid begins to change to a gas.
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Thermal Energy Always Moves From a Hot Place to a Cold Place
The thermal energy from the hot chocolate moves to your cooler hand The thermal energy from your warmer hand moves to the cold ice cream
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Conductor Insulator A material in which thermal energy moves easily
A material in which thermal energy does NOT move easily
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Light Energy The energy that moves in light waves
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Light travels in straight lines
Light travels in straight lines. It can also bounce back, turn or stop when it reaches different types of matter. Reflect (bouncing)
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Sound Energy Energy that travels in waves through vibrating matter, such as the music we hear from a radio.
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