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Grade 3 Science Ch 9

Pages 206-218

TermDefinition
Some kinds of matter can ______________ to form new kinds of matter. COMBINE
All changes to matter are either ____________ changes or ________________ changes. PHYSICAL OR CHEMICAL CHANGES
A _____________ change happens when matter hanges but does not form something new. PHYSICAL-Example: You cut a cake into pieces. Or, Ice cream changes from a solid to a liquid when it melts.
Physical changes can also happen when matter is mixed together. This ____________ is two or more kinds of matter that are combined. MIXTURE-Example Fruit salad
The parts of some mixtures are not easy to see or separate. Give an example. A smoothie might have bananas, strawberries, and yogurt blended together. Its not a new kind of matter; it is a mixture.
____________change happens when matter changes into a new kind of matter. CHEMICAL-Example; Making slime-The liquid mixture and the solid borax lost their own properties. They had a chemical change.
When iron rusts, this is what kind of change? Chemical change
___________ is a form of energy that you can hear. SOUND-Every sound is caused by a moving object that is vibrating.
A______________ is a rapid back and forth movement. VIBRATION
What are five ways an object can vibrate? hitting, rubbing, blowing, shaking, plucking
The sound of your voice are also caused by _____________. VIBRATIONS
_____________ travels in waves through matter. But these waves cannot be seen. SOUND-It travels outward from their source in all directions.
Sound passes through ____________. Matter
Sound waves travel at different ____________ through solids, liquids, and gases. SPEEDS
Sound waves travel slower through_____________ such as air. They travel faster through ________________, and the fastest through solids. GASES; liquids, solids See page 213 in book
Sound waves travel outward from a source and keep moving outward until something ___________- their path. BLOCKS
When a sound wave hits and object, the object _____________ the sound wave. REFLECTS- This means to bounce off an object
An _________ is a sound wave that reflects clearly enough to be heard again. ECHO-To reflect strongly, the wave must bounce off a large, hard surface
Bats use __________ as a way to "see" where they are going. They listen for sound waves to bounce back to them. ECHOES
Sometimes sound waves are not reflected they are ______________. ABSORBED-This mean to take in.
Materials that absorb sound can be used to make a room ____________. QUIETER-Carpet, fabric and ceiling tiles are materials used toabsorb some of the sounds in a room.
Every sound has a ____________ that depends on how fast the source of the sound is vibrating. PITCH-On a stringed instrument, the longer the string the lower the pitch. The shorter the string, the higher the pitch.
____________ is how loud or soft a sound is and depends on how much force is used to make an object vibrate. VOUME-A small drum has a higher pitch than a large drum. A small drum has a softer volume than a large drum. The phycial characteristics of the drum change their pitch and volume.
What are some ways sounds are used to communicate? Music communicates; sounds like an alarm clock or siren or buzzer communicates; We use sound to communicate with each other through our voices.
Your __________ collect sound waves, nerves carry the sound wave messages to your brain and this allows you to hear. EAR
A doctor who treats patiets with hearing problems is an ____________. Audiologist
Can you label the parts of the ear? Study page 220 in the textbook
Created by: Bonnie Daniel
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