Transcript Chemistry Midterm Review

Spring 2014
What type of element do the
tiles in the periodic table above
represent?
1. Metals
2. Metalloids
3. Nonmetals
4. What is a row in the periodic table called?
 A Period
5. What does the row number tell you?
 How many layers of electrons there are
6. What is a column in the periodic table called?
 A Group or Family
7. What does each element in a group have that is
the same?
 They have the same number of valence
electrons
8. Why are the elements listed in the group they are
in?
 Each element in a group has similar chemical
and physical properties
9. Write the name for each of
the following group numbers:
 1=Alkali Metals
 2=Alkaline Earth Metals
 17=Halogens
 18=Nobel Gases
10. Which group would not be
reactive chemically? Why?
 The Nobel gases do not react well chemically
because they’re valance shell is completed
with 8 electrons already. They do not need any
more/less to have a full valence shell.
11. List all you can about:
A. Protons:
Positive charge, found in the nucleus, amount=
atomic number
B. Electrons:
Negative charge, found around the nucleus,
amount= atomic number
C. Neutrons:
Neural charge, found in the nucleus,
amount = Mass-Atomic Number
12. What happens when an atom loses electrons?
 Losing electrons makes atoms more positive.
13. What happens if an atom gains more electrons?
 Gaining electrons makes atoms more negative
14. List all you can about:
 Metal-
conduct heat and electricity, left side periodic table,
loses electron= cation (positive)
 Nonmetal-
not conduct heat or electricity, right side periodic table,
gains electron= anion (negative)
 Metalloid-
sometimes conducts, stair step on periodic table
14. List all you can about:
 Halogens-
Group 17, very chemically reactive, 7 valence electrons,
includes F, Cl,Br, I, At, has 1- charge
 Nobel Gases-
Group 18, not chemically reactive, 8 valence electrons
 Alkali Metals-
Group 1, very chemically reactive=unstable, one valence
electron, has 1+ charge
14. List all you can about:
 Atomic Mass The average mass of an element on the periodic table
 Atomic Number-
This number equals the number of protons which also
equals the number of electrons for an element on the
periodic table
 Both are used to find the number of neutrons!
15. Drawing atoms
 Beryllium (Be):
4 protons, 5 neutrons, 4 electrons
4p+
5n
15. Drawing atoms
 Boron (B):
 5 protons, 6 neutrons, 5 electrons
5p+
6n
15. Drawing atoms
 Nitrogen (N):
7 protons, 7 neutrons, 7 electrons
7p+
7n
15. Drawing atoms
 Oxygen (O):
8 protons, 8 neutrons, 8 electrons
8p+
8n
16. What are the two types of
bonds that elements form and
explain how each one is different?
 Ionic bonds: part metal (cation) part nonmetal
(anion), bond is made when electrons are
given/taken away
 Covalent bonds: only nonmetals, makes
molecules, electrons are shared to make the bond
17. How do you know a physical
change has happened?
 No new substance made
 Indicators
1) size
2) shape
3) state of matter
4) color
18. How do you know a chemical
change has happened?
 Produces a new substance (Product)
 Atoms are being rearranged-bonds are broken and
formed
1) Heat is released-EXOTHERMIC-gets hot
2) Heat is absorbed-ENDOTHERMIC-gets cold
3) Gas is released-bubbles
4) New color
5) New odor
19. What does “conservation of
mass” mean?
 Matter can not be created or destroyed
 The mass you started with is what you end
with!
20. How are you going to get ready
for this test? What is your plan for
studying/getting ready?
 Use my review packet, read it several times
 Make flash cards for vocabulary words
 **Try to answer the review packet questions again
without looking at the answers**
 Have my friends quiz me as a competition game for
points