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