WorksheetsBalancing equations and chemical reactions.
Total questions: 21
Worksheet time: 20mins
The equation below represents an unbalanced chemical reaction. When the equation is balanced, which coefficient should be placed before NaCl?
NaI + Cl2 → NaCl + I2
2
3
4
5
Which is a correctly balanced chemical equation?
CuCl2 + Al → AlCl3 + 2Cu
2CuCl2 + 3Al → AlCl3 + 3Cu
3CuCl2 + 2Al → 2AlCl3 + 3Cu
2CuCl2 + Al → AlCl3 + 2Cu
The equation below represents a balanced chemical reaction. Which type of chemical reaction is represented?
BaCl2 + MgSO4 → BaSO4 + MgCl2
double replacement
single replacement
decomposition
synthesis
What is the coefficient of iron when the following chemical equation is balanced?
Fe + Cl2 →FeCl3
1
2
3
4
Which of the following is a decomposition reaction?
2H2O → 2H2 + O2
Mg + 2HCl → MgCl2 + H2
2Cu + O2 → 2CuO
HCl + NaOH → NaCl +H2O
In a chemical reaction, what is the relationship between the total mass of atoms for reactants and the total mass of atoms products?
They must be equal.
The mass of the products must be greater.
The mass of the reactants must be greater.
There is no general relationship between the two.
What is the general form for a single-replacement reaction?
AB+ CD → AD + CB
AB → A + B
A + B → AB
A + BC → AC + B
Which of the following best describes the reaction below?
CaO+ H2O→ Ca(OH)2
decomposition
single replacement
synthesis
double replacement
Which of the following best describes the reaction below?
CH4 + 2O2 → CO2 + 2H2O
combustion
decomposition
single replacement
double replacement
Which of the following best describes the reaction below?
KBr + AgNO3 → KNO3 + AgBr
synthesis
decomposition
double replacement
single replacement
The substances that undergo change in a chemical reaction are called
reactants
products
coefficients
elements
Hydrochloric acid, HCl, is added to solid NaOH. After the reaction is complete, NaCl dissolved in water remains. What are the products of this chemical reaction?
NaOH and HCl
NaOH and H2O
HCl and NaCl
NaCl and H2O
The unbalanced equation below represents what type of reaction?
K + P → K3P
decomposition
single replacement
synthesis
double replacement
Which type of reaction occurs when potassium iodide is combined with lead (II) nitrate to form potassium nitrate solution and lead (II) iodide powder?
decomposition
synthesis
single replacement
double replacement
Which of the following does NOT state what the arrow means in a chemical equation?
forms
conserves
produces
yields
Which of the following does NOT show the law of conservation of mass? →
2Mg + O2 → 2MgO
24 g of Mg burn in 32 g O2 to produce 56 g of MgO.
24 mL of Mg burn in 32 mL O2 to produce 56 mL of MgO.
1 atom of Mg react with 1 atom of O to produce a unit of MgO that contains 2 atoms.
2 atoms of Mg reacts with 1 molecule of O to produce a unit of MgO that contains 2 atoms.
Which of the following is a decomposition reaction?
2H2 + O2 → 2H2O
2KClO3→ 2KCl + 3O2
Fe + CuCl2 → FeCl2 + Cu
NaOH + HCl → NaCl + H2O
The chemical equation below shows the burning of methane. What type of equation is represented by the chemical equation?
CH4 + 2O2 → CO2 + H2O
combustion
synthesis
decomposition
single replacement
We balance chemical equations to show adherence to which basic law?
Conservation of Energy
Conservation of Mass
Conservation of Molecules
Conservation of Resources
Which series of numbers represents the coefficients necessary to balance the equation?
_Cu + _AgNO3 → _Cu(NO3)2 + _Ag
2, 2, 1, 4
1, 1, 1, 2
1, 2, 1, 2
0, 3, 2, 2
Which series of numbers represents the coefficients necessary to balance the equation?
_H2 + _N2 → _NH3
3, 2, 1
2, 1, 1
3, 1, 2
1, 2, 3
