Matter, Atoms and Molecules
Define Matter
Anything that has mass and takes up space
Is chopping wood a chemical or physical change?
Physical change
What is the ultimate source of energy in our Universe
The Sun
Define Energy
The ability to do work
True or False: Wavelength and Frequency are inversely proportional
True: as waves get longer they become less frequent
Arrange from largest to smallest: Proton, Electron, Neutron
Neutron, Proton, Electron
Is burning wood a chemical or physical change?
chemical change
What is the relationship between Kinetic Energy and Potential Energy
They are inversely proportional (as on goes up the other goes down)
What is Newtons's Second law of motion
Force = Mass x Acceleration
What type of waves do not need a medium to travel?
The number of Protons in the nucleus of an atom (every element has a unique number of protons, the atomic number is used to help identify an element)
What is the difference between a chemical change and a physical change?
physical changes do not impact the atomic/chemical makeup up of a substance whereas chemical changes do. Chemical changes how the atoms and molecules of a substance are arranged.
True or False : Energy conversions (changing from one form to another) can be 100% efficient under the right conditions
False: No Energy conversion is 100% efficient
Define Inertia
An object in motion will remain in motion unless acted upon by an outside force
Define Wave:
A disturbance (vibration) in a medium that carriers energy but not matter
How is atomic mass calculated?
Atomic mass is determined by adding the number of protons to the number of neutrons
What common gas is required for a combustion reaction?
Oxygen (O2)
Define Thermal Energy
Thermal Energy is energy created by the movement of particles (atoms)
On Earth, what is the acceleration due to gravity?
9.8 m/s2
What is the unit of measurement for frequency?
Hertz (HZ)
Is peanut butter a solid or a liquid?
*depends on explanation
can be considered a soft solid or a harder liquid, depending on temperature, brand, container etc.
Balance the following equation : __ KClO3 → __ KCl + __O2
2 KClO3 → 2 KCl + 3 O2
Calculate the potential energy of an object with a mass of 2kg and a height of 5 m
PE = mgh
PE =2 x 9.8 x 5
PE = 98 j
Calculate the acceleration of a 3kg object when a force of 282 N is applied to it
F = M x A
A = F / M
A = 282 / 3
A = 94 m/s2
Define : doppler effect
an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other