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WorksheetsChemical Reactions
Total questions: 19
Worksheet time: 10mins
Name
Class
Date
1.
What does the symbol Δ in a chemical equation mean?
a)
heat is supplied to the reaction
b)
a catalyst is needed
c)
yields
d)
precipitate
2.
In a decomposition reaction:
a)
the reactants are generally two ionic compounds in aqueous solution
b)
energy in the form of heat or light is often produced
c)
one of the reactants is often water
d)
the reactants are usually a metal and a nonmetal
3.
The chemical equation, Cr + Fe(NO3)2 → Fe + Cr(NO3)3, is an example of which type of reaction?
a)
double-replacement
b)
combustion
c)
decomp.
d)
single-replacement
4.
Which of the following are decomposition reactions?
1. CH4 (g) + O2 (g) → CO2 (g) + H2O (l)
2. CaO (s) + CO2 (g) → CaCO3 (s)
3. Mg (s) + O2 (g) → MgO (s)
4. PbCO3 (s) → PbO (s) + CO2 (g)
1. CH4 (g) + O2 (g) → CO2 (g) + H2O (l)
2. CaO (s) + CO2 (g) → CaCO3 (s)
3. Mg (s) + O2 (g) → MgO (s)
4. PbCO3 (s) → PbO (s) + CO2 (g)
a)
2 and 3
b)
4 only
c)
2, 3, and 4
d)
all are decomp. reactions
5.
What type of reaction is FeS + 2HCl --> FeCl2 + H2S
a)
synthesis
b)
decomp.
c)
combustion
d)
replacement
6.
A chemical reaction that absorbs energy in the form of heat is described as
a)
exothermix
b)
endothermic
c)
unbalanced
d)
combustion
7.
The substances listed on the left side of a chemical equation are the
a)
products
b)
coefficients
c)
percipitates
d)
reactants
8.
What group contains the most elements?
a)
transition metals
b)
metals
c)
non-metals
d)
metalloids
9.
every chemical reaction involves a change in
a)
concentration
b)
mass
c)
energy
d)
state
10.
The number placed below an element's symbol in a chemical formula is called a
a)
product
b)
coeffecient
c)
subscript
d)
reaction
11.
2 H2 + O2 -->____ H2O
a)
1
b)
5
c)
3
d)
2
12.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed
b)
The total mass of the reactants is greater than the total mass of the products
c)
Matter can never be changed
d)
The total mass of the reactants is less than the total mass of the products
13.
A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be....
a)
A replacement reaction
b)
Balanced
c)
Unbalanced
d)
An incomplete reaction
14.
The only sure evidence for a chemical reaction is
a)
A color change
b)
The formation of a gas
c)
The production of one or more new substances
d)
Changes in properties
15.
What type of chemical reaction is represented in the reaction ____ N2 + __3__ H2 --> ___2_ NH3
a)
decomp
b)
combustion
c)
synthesis
d)
replacement
16.
From an element's location in the periodic table you can predict
a)
Name
b)
It's properties
c)
I don't know
17.
In a chemical equation numbers often appear in front of a chemical formula. These numbers tell you the
a)
Number of molecules or atoms of each substance in the reaction
b)
Number of atoms in each molecule in the reaction
c)
Number of molecules in each atom in the reaction
d)
Number of elements in the reaction
18.
What happens when chemical bonds break and new bonds form
a)
A physical change
b)
Matter is destroyed
c)
A chemical reaction
d)
Surface area increases
19.
The principle of conservation of mass is true...
a)
Only for reactions that take place in open systems
b)
For no reactions
c)
Only for reactions that take place in closed systems
d)
For all reactions
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