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Elements, Compounds, Molecules
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Which statement about atoms is true?
 
electrons orbit a nucleus of protons & neutrons
 
protons orbit a nucleus of electrons & neutrons
 
neutrons orbit a nucleus of protons & electrons
 
they are solid spheres
What charge does a neutron have?
 
neither negative nor positive
 
positive
 
negative
 
both negative and positive
What is found in the nucleus of an atom?
 
protons & neutrons
 
electrons & protons
 
neutrons & electrons
 
protons only
What do we call a substance that is only made up of one kind of atom?
 
element
 
compound
 
proton
 
nucleus
Which of these is an ELEMENT?
 
oxygen
 
carbon dioxide
 
water
 
salt
Which statement is correct?
 
2 or more atoms combined forms a molecule
 
2 or more molecules combined together forms an atom
 
every molecule forms a compound
 
molecules must all be made up of exactly 3 atoms
Look at the model of a molecule. How many different elements are used to form the molecule?
 
1
 
2
 
3
 
what?
What is this image a model of?
 
a molecule that forms a compound
 
a molecule that forms an element
 
an atom
 
a molecule that forms an atom
What is the image a model of?
 
a molecule that is an element
 
an atom
 
a molecule that is a compound
 
nothing - just two circles for no reason
How many atoms of oxygen are in a molecule of carbon dioxide?
 
2
 
1
 
there's no way to tell
 
3
Which of these is a COMPOUND?
 
carbon dioxide
 
carbon
 
hydrogen
 
oxygen
Which of these is a COMPOUND?
 
salt
 
hydrogen
 
iron
 
oxygen
What is the image a model of?
 
a model of an atom
 
a model of a compound
 
a model of a molecule
 
a model of the solar system
What is the image a model of?
 
it's a molecule of the compound water
 
it's an atom of the element water
 
it's a molecule of the element water
 
it's an atom of the compound water
How many atoms make up a molecule of water?
 
3
 
2
 
1
 
there's no way to know
Which of these is an ELEMENT?
 
carbon
 
carbon dioxide
 
water
 
sugar