Download Review for Physical Science Test #2

Review for Compounds, Reactions, Acids & Bases Test
Compounds
1. Compounds are made of ______________________ of elements that are
_______________________________ together.
2. What are two ways that atoms can be bonded together? (Hint: both have to do with
electrons.)
3. Which type of compound is always a solid at room temperature, ionic or covalent?
4. Write a “recipe” for each compound based on its formula. The first one is done as
an example.
Ca(OH)2 – 1 atom of calcium, 2 atoms of oxygen, 2 atoms of hydrogen
MgSO4 –
HC2H3O2 –
ZnS –
C6H12O6 –
5. How do you know if a compound is ionic?
6. Bonds between atoms in a compound store _____________________.
7. Circle the ionic compounds and underline the covalent compounds.
NO2
H2O
NaCl
ZnS
CuSO4
CH4
MgCl2
HC2H3O2
KI
Chemical Reactions
8. What are the three things a chemical reaction can do to a compound?
9. For each reaction, write “element” or “compound” below each chemical in the
equation, then in the blank, write the type of reaction shown (synthesis,
decomposition, replacement). The first one is done as an example.
2 H2O2  O2 + 2 H2O
Compound
Element
Decomposition
___________
Compound
HCl + NaOH  H2O + NaCl
___________
Na2CO3  Na2O + CO2
___________
Cu + AgNO3  Cu(NO3)2 + Ag
___________
4 Fe + 3 O2 2 Fe2O3
___________
Mg + 2 HCl  MgCl2 + H2
___________
O2 + 2 Mg  2 MgO
___________
10. Are the reactants on the left or right side of the arrow in an equation?
11. A chemical reaction that gives off heat energy is an _______thermic reaction, while a
reaction that absorbs heat from its environment is an _______thermic reaction.
Acids & Bases
12. How do acidic foods (like lemons or pickles) usually taste?
13. How do basic foods (like cocoa powder or coffee) usually taste?
14. Circle the acids and underline the bases in the following formulas (some will be
neither acid nor base).
KOH
NH4OH
HNO3
Ca(OH)2
CuSO4
NaOH
H2SO4
Ba(OH)2
ZnS
MgCl2
HCl
HC2H3O2
NaCl
15. Which is more likely to react with a piece of metal, an acid or a base?
16. A cleaning solution that takes grease off of countertops has a label that says
“contains sodium hydroxide.” Is it an acid or a base?
17. If a solution has a pH of 9, is it an acid or a base?
18. What is a “pH indicator”? Give an example.
19. Carmine the Chemist is working with a chemical called superduper yellow. Her
data table is shown below. Write a “rule” that explains how this chemical changes
color.
pH of test
solution
Color after adding
superduper yellow
0
yellow
2
yellow
4
yellow
6
yellow
7
yellow
8
yellow
10
yellow
12
purple
14
purple
20. Which choice below would be the best use for this chemical?




To tell a strong acid from a weak acid
To tell an acid from a neutral solution
To tell a strong base from a weak base
To create a temporary tattoo on your little sister’s face right before picture day.
Compounds
1. Compounds are made of __atoms___ of elements
that are _______bonded_____ together.
2. What are two ways that atoms can be bonded
together? (Hint: both have to do with electrons.)
Transfer or share electrons
3. Which type of compound is always a solid at room
temperature, ionic or covalent?
Ionic
4. Write a “recipe” for each compound based on its
formula. The first one is done as an example.
Ca(OH)2 – 1 atom of calcium, 2 atoms of oxygen, 2
atoms of hydrogen
1 atom magnesium, 1 atom sulfur, 4
atoms oxygen
MgSO4 –
4 atoms hydrogen, 2 atoms carbon, 2
atoms oxygen
HC2H3O2 –
ZnS – 1 atom zinc, 1 atom sulfur
C6H12O6 – 6 atoms carbon, 12 atoms hydrogen, 6
atoms oxygen
5. How do you know if a compound is ionic? It has a
metal in it
6. Bonds between atoms in a compound store
____energy____.
7. Circle the ionic compounds and underline the
covalent compounds.
NO2
H2O
NaCl
ZnS
CuSO4
CH4
MgCl2
HC2H3O2
KI
Chemical Reactions
8. What are the three things a chemical reaction can
do to a compound?
Make, break, or
change it
9. For each reaction, write “element” or “compound” below each chemical in the
equation, then in the blank, write the type of reaction shown (synthesis,
decomposition, replacement). The first one is done as an example.
Decomposition
___________
2 H2O2  O2 + 2 H2O
Compound
Element
Compound
Replacement
___________
HCl + NaOH  H2O + NaCl
Compound Compound
Compound Compound
Decomposition
___________
Na2CO3  Na2O + CO2
Compound
Compound
Compound
Cu + AgNO3  Cu(NO3)2 + Ag
Element
Compound
Compound
Element
Synthesis
___________
4 Fe + 3 O2 2 Fe2O3
Element
Element
Compound
Mg + 2 HCl  MgCl2 + H2
Element Compound
Compound
Element
Replacement
___________
Element
O2 + 2 Mg  2 MgO
Element
Replacement
___________
Compound
Synthesis
___________
10. Are the reactants on the left or right side of
the arrow in an equation?
Left
11. A chemical reaction that gives off heat energy
is an _EXOthermic reaction, while a reaction
that absorbs heat from its environment is an
_ENDOthermic reaction.
Acids & Bases
12. How do acidic foods (like lemons or pickles)
usually taste?
Sour
13. How do basic foods (like cocoa powder or
coffee) usually taste?
Bitter
14. Circle the acids and underline the bases in
the following formulas (some will be neither
acid nor base).
KOH
NH4OH
HNO3
Ca(OH)2
CuSO4
NaOH
H2SO4
Ba(OH)2
ZnS
MgCl2
HCl
HC2H3O2
NaCl
15. Which is more likely to react with a piece of
metal, an acid or a base?
Acid
16. A cleaning solution that takes grease off of
countertops has a label that says “contains
sodium hydroxide.” Is it an acid or a base?
Base
17. If a solution has a pH of 9, is it an acid or a
base?
Base
18. What is a “pH indicator”? Give an example.
A Chemical that changes color in
different pH solutions. For
example: Litmus, thymol blue,
methyl red, indigo carmine, . . .
19.
Carmine the Chemist is working with a
chemical called superduper yellow. Her data
table is shown below. Write a “rule” that
explains how this chemical changes color.
pH of test
solution
Color after adding
superduper yellow
0
yellow
2
yellow
4
yellow
6
yellow
7
yellow
8
yellow
10
yellow
12
purple
14
purple
Superduper yellow turns
from yellow to purple at
pH 10-12.
20. Which choice below would be the best use
for this chemical?
 To tell a strong acid from a weak acid
 To tell an acid from a neutral solution
 To tell a strong base from a weak base
 To create a temporary tattoo on your little
sister’s face right before picture day.