7th A
What are you studying this quarter
How reactants will have different properties than products
How is sound transmitted?
Sound is transmitted through waves
Which change can not be reversed?
A chemical change
What is a wave?
A disturbance that transfers energy
What have you been studying
How temperature affects collision rates
What are the visual clues to a chemical change
Smoke, color change, smell, and temperature
When the height of the wave doubles what does the energy do?
The energy quadruples
What are chemical properties
Characteristics of a substance that describe its ability to change
What is the pitch of a sound related to?
What is frequency
How does temperature affect particle movement?
Colder temperatures means slower movement and warmer temperatures mean faster movement
What is the relationship between reactants and products?
The reactants will have different properties that the products
Amplitude of the wave is related to what
The volume of the wave
What is the collision theory
For a reaction to occur, reactant particles must collide
What kind of waves could break glass?
Waves with a very high amplitude
What does it mean when the rate of a reaction is very high
There is enough energy to break chemical bonds
How does temperature affect reaction rate
increases in temperature increase the kinetic energy leading to more frequent collisions
What are the two types of waves?
Transverse & longitudinal
What is created when sugar and oxygen combine?
Water droplets
What is it called when a sound wave reflects off a surface
What is an echo
Why might an explosion happen when dust is exposed to oxygen
When more oxygen molecules are present, there is an increased chance for collision
Define chemical reaction
A process that leads to the transformation of chemical substances
What is the change in the way you hear a noisy object as it moved toward or away from you called ?
What is the doppler effect
When sugar is burned, what gas is produced?
Carbon dioxide
What combination of Hertz and decibels is best for breaking glass?
500 Hz and at least 100 dB
What conditions will result in the lowest chance of explosion
Cold temperatures and decreased oxygen