Endo/Exo
The heat exits, this means it is a _______ reaction
exothermic
Is a car rusting a physical or chemical change? why?
chemical because rusting is a sign of chemical chnage.
How many group names are there?
4
For an atom to have a neutral charge what factor does the atom need to have?
The atom needs to have the same amount of protons and electrons.
The heat enters, this means it is a _______ reaction
endothermic
Is a cookie breaking in half a physical or chemical change? why?
Physical because it changes the shape which is a sign of physical change.
What is the little number on the top?
Atomic number
What is the charge of each subatomic particle.
Proton
Does it usually flow warm or cold air?
warm
Is water boling a physical or chemical? why?
Physical because this changes the state of matter which is a sign of physical change.
What is the little number on the bottom?
Atomic mass
What do all endo/exothermic reaction have a change in?
energy.
What are all the signs of physical change?
Change of size, change of state of matter, change in shape
What are the elemnts on the bottom?
They are the newer ones that scientists do not know much about.
Is photosynthesis an example of endo or exothermic reaction? why?
Endothermic because it absorbs energy from its surroundings
What are all the signs of a chemical change?
Bubbling, rust, change of color, change of odor
How much elements are on the periodic table?
118