WorksheetsUnit 6 PACKET Test
Total questions: 31
Worksheet time: 32mins
What does a chemical formula indicate about a compound? (select all that are correct)
The elements that make up the compound.
The number of atoms of each element.
How many grams of each substance are used.
none of these are correct
How many hydrogen atoms are in 4NH4OH (four units of ammonium hydroxide)?
4
5
16
20
What coefficients will balance the following reaction?
C3H8 (g) + O2 (g) --> CO2 (g) + H2O (g)
3:5:6:4
1:5:3:4
2:10:6:8
2:3:5:1
Which of the following are true about the reaction below?
Zn(s) + CuCl2(aq) --> ?
Zinc will replace copper in a single replacement reaction.
Zinc will replace chloride in a single replacement reaction.
The reaction will yield ZnCl2 and Cu.
The reaction will yield ZnCu and Cl2.
KClO3(S) --> KCl(s) + O2(g)
The reaction of potassium chlorate (KClO3) is represented in the equation above. What is the coefficient for oxygen gas (O2) when the equation is balanced?
1
2
3
4
According to the law of conservation of mass, how much zinc was present in the zinc carbonate?
96 g
204 g
52 g
32 g
The reaction below produces what 2 products?
AgNO3 + FeCl3 --> ________ + _________
Ag3Fe
3NO3Cl
3AgCl
Fe(NO3)3
Which of the following abbreviations are paired correctly?
(s) = solid
(g) = gas or vapor
(aq) = aqueous or dissolved in water
(l) = liter or volume
When two substances are mixed, the temperature decreased. This is an example of a _________________ reaction.
endothermic
exothermic
combustion
isothermic
A reaction involving only one reactant that splits into two products would be classified as:
single displacement.
double displacement.
combustion.
synthesis.
decomposition.
Aluminum and Chlorine combine to produce ______________ in a synthesis reaction.
AlCl2
AlCl3
AlCl
no reaction would take place because aluminum is less active than chlorine.
Which of the following are true of combustion reactions?
Combustion reactions involve a fuel (hydrocarbon) reacting with oxygen (O2).
Combustion reactions always produce CO2 and H2O.
Combustion reactions are all exothermic because they release heat.
Combustion reactions are the same as double replacement reactions.
CaCO3 is heated in a test tube to release CO2 gas and solid CaO. How much CO2 is produced if 6 grams of CaCO3 decomposes to produce 5 grams of CaO?
CaCO3 --> CaO + CO2
1
3
5
11
What coefficients will balance the following reaction?
H3BO3 --> B2O3 + H2O
1:2:3
2:1:3
3:2:1
2:3:1
A chemical reaction occurs in an open environment. Why might the mass of the products appear to have "lost" mass?
one (or more) of the products is a gas, and it escaped
the missing mass was destroyed
the missing mass was converted to energy
the heat caused the compound to become less dense
Which of the following is matched correctly?
A + B --> AB is a synthesis reaction.
AB --> A + B is a combustion reaction
A + BC --> AC + B is a single displacement reaction
AB + CD --> AD + CB is a double displacement reaction
Which of the following are chemical reactions?
condensation
evaporation
synthesis
decomposition
combustion
A chemical reaction occurs on a scale. Why does the scale read the same before and after the reaction?
The total mass is conserved in the chemical reaction.
Energy was converted to mass in the chemical reaction.
The densities remained the same because the products were the same as the reactants.
Kinetic energy was converted to chemical potential energy.
A reaction that releases heat is
an endothermic reaction.
always a combustion reaction.
an isothermic reaction.
an exothermic reaction.
The reactants are found _____________ the arrow, and products are found ______________.
before, after
after, before
Which of the following is a characteristic of all chemical changes (reactions)?
A different state of matter is produced.
Some mass is converted to energy.
Some form of light is given off.
A new material is formed.
The elements that make up a compound and the exact number of atoms of each element in a unit of the compound can be shown in a ____.
subscript
coefficient
chemical symbol
chemical formula
A chemical equation is balanced when the
the number of each type of atom is equal on both sides of the reaction.
The coefficients add up to the same number.
the subscripts are the same in the reactants and products.
the products and the reactants are the same chemicals.
What coefficients will balance the following reaction:
CaO + H2O --> Ca(OH)2
1:1:1
1:2:1
2:2:1
2:1:1
In the elemental form, some elements are written as diatomic molecules (2 atoms). Which of the following elements would be written in this way? (be sure to select all)
chlorine
oxygen
hydrogen
phosphorus
nitrogen
A change in mass would be an indication of a chemical change.
True
False
Which of the following is not a RedOx reaction?
2HgO --> 2Hg + O2
CH4 + 2O2 --> CO2 + 2H2O
2KI + Pb(NO3)2 --> PbI2 + 2KNO3
2H2 + O2 --> 2H2O
What is the oxidation number of the iron (Fe) atom in the compound Fe2O3?
0
+1
+2
+3
For the reaction below, which element is oxidized?
2Al + 3NiCl2 --> 2AlCl3 + 3Ni
Al
Cl
Ni
Which of the following would be in insoluble precipitate? (See solubility chart)
Ba(OH)2
CuS
LiNO3
NaCl
Which of the following will result in NO reaction? (use your Activity Series)
Zn + 2 HCl --> _______
Cu + 2 HCl --> _______
Cu + AgNO3 --> _______
Li + NaCl --> _______
