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Worksheetsscience
Total questions: 45
Worksheet time: 35mins
define atom
smallest particle of matter
largest particle of matter
define molecule
define substance
a group of 2 types of atom/molecule
a group of many type of atom/molecule
a group of one type of atom/molecule
define dissolve
To break down a substance into smaller pieces and mix with another substance
define soluble/solubility
what does dissolving look like at the nanoscale?
when molecules of a solid are attracted to the moecules of a liquid, they spread apart and mix together evenly.
when molecules of a solid are attracted to the moecules of a liquid, they spread far apart and never mix together evenly.
when molecules of a solid are never attracted to the moecules of a liquid, they don't mix evenly.
when molecules of a gas are attracted to the moecules of a plasma, they spread apart and mix together evenly.
how can someone tell if two substances are made of the same molecules or different molecules?
By comparing their properties
By comparing their chemical formulas
By comparing the way you mixed them.
why do oil and water separate again after being mixed?
Oil and water separate because they are not attached to each othter.
what happens when oil and water separate?
Oil and water separate because oil is less dense than water
Which of the pictures represents how substances can be combined to create an entirely new substance?
blood
mm and ice cream
red beans and rice
Which of the pictures represents how substances can be combined to create an entirely new substance?
sugar and water
flour and eggs
salt and water
strawberry and orange
define mixture
a group of two or more types of atoms
a group of two or more types of molecules and atoms
a group of two or more types of molecules and compounds
a group of two or more types of element
how do we describe matter
by their weight only
by their space only
by their density only
by their properties
Match the following properties of the pizza
taste
weight
smell
temperature
size
Match the following states of matter
solid
liquid
gas
define observation
Match the following
when atoms/molecules are very close and move slowly
solid
when atoms/molecules flow around near each other
liquid
when atoms/molecules are far away from each other.
gas
true/false: all molecules will have the same properties?
true
false
true/false: all the molecules/atoms of one particular substances has the same properties?
true
false
what happens when atoms and molecules are heated up?
The atoms and molecules gain energy and move faster, causing the molecules to move away from each other.
The atoms and molecules gain energy and move slower, causing the molecules to move away from each other.
The atoms and molecules lose energy and slow down, causing the substance to come together
what happens to atoms/molecules when they are cooled down?
Match the following
solid
liquid
gas
increase temperatue
particles move quickly
decrease temperature
particles slow down
define properties
Characteristics or how we describe an object
define liquid:
define gas:
when the atoms or molecules are flowing around near each other.
when the atoms or molecules are flowing close together tightly packed.
when the atoms or molecules are flowing loosley together
when the atoms or molecules are flowing liquidly
define solid
Match the following
solid
holds its own shape
liquid
takes the shape of its container
gas
fills the container
define evaporation
liquid turning to gas
liquid turning to solid
solid turning to liquid
gas turning to liquid
define condensation
gas changed into liquid
define melting
what is the conservation of matter?
matter can be created or destroyed.
matter cannot be created or destroyed in a closed system, only transformed or rearranged.
define matter=
define physical change
define chemical change
melting ice
tearing paper
boiling water
breaking a pencil
melting ice cream
stretching a rubber band
cutting a piece of cloth
crumpling a piece of paper
burning wood
rusting iron
exploding fireworks
digesting food
fermenting grapes
oxidizing metal
rotting fruit
decomposing leaves
define physical properties
Physical properties are characteristics of matter that can be observed or measured without changing the matter
define chemical properties
characteristics of a substance that can be observed when the matter changes in a reaction.
Can we look at matter and know its chemical properties without testing its chemical properties?
yes
no
mabey
sometimes
Organize these examples into the right categories:
weight
mass
volume
density
length
height
width
temperature
melting point
boiling point
reactivity
flammability
oxidation state
electronegativity
ionization energy
taste
solubilit
corrosive
combustible
how do you know if molecules have changed in a mixture?
properties of the mixture have permanently changed.
when a change occurs, will the weight of the substances after the change be more than, less than, or equal to the weight of the substances before the change
more than
less than
eequal to the weight of the substances before the change
Why, when a chemical/physical change occurs, does the weight of the substance stay the same?
law of chemical change
law of physical change
law of nuclear energy
law of conservation of matter
what are some observable clues that a change has occured? sort it out
change in color
formation of gas
formation of precipitate
change in temperature
change in odor
change in light emission
change in electrical conductivity
change in magnetic properties
produce electricity
change in shape
change in size
change in state
change in density
change in volume
change in texture
change in flexibility
what happens when two substances are mixed together? Pick two:
The substances separate if the molecules do not attract.
a mixture occur if the molecules attract each other.
define freezing
