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