TEST 1 Review
Standard 1, Objective 1
Name________________________
1. What is an atom?
The smallest of Matter (matter is anything that has mass and take up space (Volume))
2. What is a molecule?
A molecule is two or more atoms bonded together and example of a molecule would be 02 oxygen,
or H20 water. Both of these molecules have more than one atom. O2 has two oxygen atoms, and
H20 has two hydrogen atoms and one oxygen atom.
3. What are the similarities between atoms and molecules? List 2.
Both molecules and atoms are made of proton, neutrons, and electrons. Both atoms and
molecules make up the world around us. Both are too small to be seen by the naked eye.
4. What are the differences between atoms and molecules? List 2.
Atoms are singular, molecules are plural. Molecules can be elements or compounds, atoms are
only elements.
5. What is an element? Give two examples.
An element is something that cannot be changed into another substance by breaking it apart. We
find all the elements on the period table of elements. Hydrogen (H), Helium (He), Gold (Au),
Aluminum (Al).
6. What is a compound? Give two examples.
A compound is a molecule which contains more than one element. H20 is the compound water,
NaCl is the compound salt.
7. What does the atomic theory say?
1) All matter is made of atoms. 2) Atoms are indivisible and indestructible. 3) Compounds are
formed by a combination of two or more different kinds of atoms.
8. Who came up with the atomic theory?
Originally John Dalton was the author of the Atomic Theory.
9. How long did it take for scientists to figure out everything we know about atoms?
It to scientist over 2000 year to find out all we know about atoms today
10. Who named the atom?
Democritus Named the Atom it was named Atomos from which the English word Atom is derived.
11. What are the 3 phases of matter?
The three phases of Matter are Solid, Liquid and Gasses
12. Describe the properties of a solid. List 2.
You cannot walk through a solid wall. The matter is packed so tight that it prevents
you from moving through it. Solids hold their shape at room temperature.
13. Describe the properties of a liquid. List 2.
Liquids do not hold their shape at room temperature. There is space between the
atoms of a liquid and they move slightly all of the time.
14. Describe the properties of a gas. List 2.
Gases not only do not hold their shape at room temperature, they don't even stay
put. Gases are always moving. There is so much space between the atoms in gas that
you can move around in them easily.
15. What happens to the molecules in a solid as it changes into a liquid?
During Each change of state the molecules will change their movement and space between the
atoms or molecules. When a solid changes to a liquid the particles increase speed and spread
apart slightly.
16. What happens to the molecules in a liquid as it changes into a gas?
Changing from a liquid to a gas particles will start moving very fast and have a lot of space inbetween them. This is why it is easy to move through gas.
17. What happens to the molecules in a gas as it changes back into a liquid?
When heat is removed from a gas then the particles will start to move slower and condense back
into a liquid. Particles will also move closer together.
18. Draw what the molecules look like in a solid, a liquid, and a gas below.
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:
Solid
. : . : :. . .
. . .: .: . : :
Liquid
.
.
.
.
.
.
: . .
.. . .
.
Gas
19. Draw and label the parts of an atom.
20. Why isn’t it very practical to make a scale model of an atom?
It is not practical to build a scale model of an atom because most of the atom is empty space. For
us to be able to see the parts of the atom especially the electron we have to have approximately
500 meters of space to build a model. Most of us do not have backyards that size.