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Chemical Changes
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Describe what a coefficient tells you in a chemical equation
how many molecules are present
What does flammability tell you about a substance
how easily it burns
What determines the state of matter according to the packet
particle movement and spacing
How do particles behave in a solid
they vibrate in fixed positions
Describe the difference between a reactant and a product
reactants start the reaction products form at the end
Explain what oxidation is using packet info
reacting with oxygen
Give one example of a chemical property
flammability
What happens to the total mass during a reaction according to the law of conservation of mass
it stays the same
Describe what reactivity means using your own words
how quickly a substance reacts with something else
Explain why rust is considered a chemical change
it creates a new substance
Give one example of a physical change from the packet
melting ice
Describe what happens to particle motion when a liquid boils
particles move fast enough to break away into vapor
Define mass in your own words
the amount of matter in an object
Name a sign of chemical change
formation of gas
What happens to atoms during a reaction
 
they rearrange
 
they shrink
 
they disappear
 
they multiply
Which is a sign of a chemical change
 
formation of a gas
 
melting
 
freezing
 
breaking into pieces
Which is an example of a physical property
 
texture
 
rust forming
 
burning
 
gas production
What happens in a chemical change
 
new substances form
 
only the temperature changes
 
only the size changes
 
the substance stays the same
What is a chemical reaction
 
when something freezes
 
when something changes shape only
 
when substances change into new substances *correct*
 
when something melts
What makes something a chemical property
 
it describes the ability to undergo a chemical change *correct*
 
it describes temperature only
 
it describes color only
 
it describes size and shape
What is flammability
 
how flexible something is
 
how easily something lights on fire *correct*
 
how much space it fills
 
how easily something dissolves
What is a coefficient in chemistry
 
the number showing how many molecules are present *correct*
 
the number of electrons in an atom
 
the total mass in the reaction
 
the temperature needed for a reaction
What does oxidation often involve
 
a change from liquid to solid
 
a reaction with oxygen *correct*
 
a decrease in temperature
 
the formation of a physical change only
What does reactivity describe
 
how well something floats
 
how easily something reacts with oxygen or water *correct*
 
how smooth something feels
 
how flexible something is
What is volume
 
the speed of particles
 
the amount of space something takes up *correct*
 
the heaviness of an object
 
the number of atoms in an object
What is density
 
how shiny something is
 
how much mass is in a given volume *correct*
 
how hot something is
 
how fast an object moves
What is a reactant
 
a type of energy
 
the substance that is changed in a reaction *correct*
 
the final substance created
 
a type of atom
What is a product in a chemical reaction
 
the substance made after the reaction *correct*
 
the gas that forms
 
the starting material
 
the heat released
What does the law of conservation of mass mean
 
mass disappears during changes
 
mass only applies to solids
 
mass stays the same during changes *correct*
 
mass increases during changes
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