WorksheetsU4 Balancing and Chemical Reactions
Total questions: 39
Worksheet time: 20mins
The equation shows a chemical reaction. 2 AgNO₃ + CuCl₂ → 2 AgCl + Cu(NO₃)₂ Which type of reaction is represented by this equation?
synthesis reaction
decomposition reaction
single replacement reaction
double replacement reaction
The equation shows a partial chemical reaction. Ba(NO₃)₂ + Na₂CO₃ → ? What is the completed and balanced equation for this reaction?
Ba(NO₃)₂ + Na₂CO₃ → BaNa₂ + (NO₃)₂CO₃
Ba(NO₃)₂ + Na₂CO₃ → BaCO₃ + Na₂(NO₃)₂
Ba(NO₃)₂ + Na₂CO₃ → BaCO₃ + 2 NaNO₃
Ba(NO₃)₂ + Na₂CO₃ → Ba(CO₃)₂ + Na₂NO₃
In which kind of reaction does a single reactant produce two or more simpler substances?
decomposition reaction
synthesis reaction
displacement reaction
ionic reaction
The equation shows a chemical reaction. Zn(g) + CuCl₂(aq) → ZnCl₂(aq) + Cu(g) What kind of reaction is this?
synthesis reaction
ionic reaction
displacement reaction
combustion reaction
Which kind of reaction is represented by the chemical reaction below? 2KClO₃(s) → 2KCl(s) + 3O₂(g) is a(n)
synthesis reaction
decomposition reaction
combustion reaction
ionic reaction
Which type of reaction takes place when one element reacts with a compound to form a new compound and a different element?
combination reaction
decomposition reaction
single replacement reaction
double replacement reaction
In what kind of reaction do two or more substances combine to form a new compound?
decomposition reaction
ionic reaction
double-displacement reaction
synthesis reaction
The equation shows a chemical reaction. H₂CO₃ → H₂O + CO₂ Which type of reaction is represented by this equation?
synthesis reaction
decomposition reaction
single replacement reaction
double replacement reaction
The equation shows a chemical reaction. 2 H₂O₂(l) → 2 H₂O(l) + O₂(g) What kind of reaction is this?
synthesis reaction
decomposition reaction
displacement reaction
ionic reaction
The equation A + X → AX is the greatest equation for which kind of reaction?
combustion reaction
ionic reaction
synthesis reaction
double-displacement reaction
Which of the following represents a single replacement reaction?
Ca(OH)₂ → CaO + H₂O
Zn + 2HCl → ZnCl₂ + H₂
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
Which example shows a double replacement reaction?
KCl + AgNO₃ → AgCl + KNO₃
Cu + Ag(NO₃)₂ → Ag + Cu(NO₃)₂
Na₂CO₃ → Na₂O + CO₂
CaO + CO₂ → CaCO₃
Which reaction is classified as a synthesis reaction?
Zn + 2HCl → ZnCl₂ + H₂
2Al + 3Br₂ → 2AlBr₃
2H₂O → 2H₂ + O₂
NaCl → Na + Cl
Which reaction shows decomposition?
CO₂ → C + O₂
Cu + O₂ → CuO₂
Zn + CuSO₄ → ZnSO₄ + Cu
NaOH + HCl → NaCl + H₂O
The equation shows a chemical reaction. Pb(NO₃)₂ (aq) + 2 KI (aq) → 2 KNO₃ (aq) + PbI₂ (s) What type of chemical reaction is represented by this equation?
combination reaction
decomposition reaction
single replacement reaction
double replacement reaction
The chemical equation shows how sodium and oxygen combine to form sodium oxide. Na + O → Na₂O Which number must be placed in front of Na to balance the equation?
1
2
3
4
A chemical equation is shown. 4FeS + 7O₂ → 2Fe₂O₃ + 4SO₂ Which statement is correct about the chemical equation?
It is balanced because the mass of the reactants is equal to the mass of the products.
It is unbalanced because the mass of the reactants is greater than the mass of the products.
It is balanced because the sum of the coefficients of the reactants is greater than the sum of the coefficients of the products.
It is unbalanced because the sum of the coefficients of the reactants is greater than the sum of the coefficients of the products.
Combustion reactions are ones that always include elemental oxygen as a reactant. When a hydrocarbon (a substance made up of carbon and hydrogen) reacts with oxygen, the products of the combustion reaction are carbon dioxide and water. Which products complete the reactants to form a balanced chemical equation for a combustion reaction? 2 C₂H₆ + 7 O₂ →
4 CO₂ + 6 H₂O
3 CO₂ + 6 H₂O
2 CO₂ + 8 H₂O
5 CO₂ + 4 H₂O
What are the coefficients needed to balance this chemical reaction to show that matter is conserved? Fe + Cl₂ → FeCl₃
1, 1, 1
2, 3, 2
3, 2, 2
4, 2, 2
In the following reaction, which substances are reactants? CH₄ + 2O₂ → CO₂ + 2H₂O
CO₂ and H₂O
CH₄ and O₂
CH₄ and H₂O
O₂ and CO₂
When the equation __ Na + __ H₂O → __ H₂ + __ NaOH is correctly balanced using the smallest whole-number coefficients, what is the coefficient for H₂O?
1
2
3
4
When the equation __ Fe₂O₃(s) + __ CO(g) → __ Fe(l) + __ CO₂(g) is correctly balanced using the smallest whole numbers, what will be the coefficient of Fe(l)?
1
2
3
4
The chemical equation below is unbalanced. __ Fe₂O₃ + __ CO → __ Fe + __ CO₂ When the equation is correctly balanced using the smallest whole-number coefficients, what is the coefficient of CO?
1
2
3
4
When the equation __ Al(s) + __ O₂(g) → __ Al₂O₃(s) is correctly balanced using the smallest whole numbers, what will be the coefficient of Al(s)?
2
3
4
5
According to the law of conservation of matter, the number of Fe atoms needed to complete the following reaction is:
1
2
3
4
Look at the following chemical equation. 2H₂O₂ → 2H₂O + O₂ Does this equation follow the conservation of mass?
Yes, because the mass of the reactants is greater than the mass of the products.
No, because the mass of the reactants is greater than the mass of the products.
No, because the coefficient of the reactant is less than the coefficient sum of the products.
Yes, because each atom that is in the reactants is found in the products.
Look at the following chemical equation. H₃PO₄ + 5HCl → PCl₅ + H₂O What is true about this chemical equation?
It is balanced because the number of reactants is equal to the number of products.
It is unbalanced because the mass of the reactants is greater than the mass of the products.
It is balanced because the mass of the reactants is equal to the mass of the products.
It is unbalanced because the mass of the reactants is less than the mass of the products.
Which chemical equation follows the law of conservation of matter?
2K + Ca(NO₃)₂ → K(NO₃) + Ca
C₅H₁₂ + 7O₂ → 5CO₂ + 6H₂O
GaF₃ + 3Cs → 3CsF + Ga
2VCl₂ + H₂ → 2HCl + V
A chemical reaction is shown. 4P + 5O₂ → P₂O₅ What coefficient needs to be placed in front of the products to make sure the law of conservation of matter is followed?
1
2
3
4
Which chemical formula represents a covalent compound because they share electrons?
NaCl
MgO
CO₂
KI
What is the formula for the compound formed by the barium ion, $ \text{Ba}^{2+} $, and the hydroxide ion, $ \text{OH}^- $?
BaOH
BaOH₂
Ba(OH)₂
Ba₂(OH)₁
Barium and oxygen bond together to form a compound. Which model BEST shows the bond that forms?
Model A
Model B
Model C
Model D
Ionic bonds involve
attraction between water and salts.
electrostatic interactions between anions and cations.
the release of protons by negatively charged particles.
the sharing of electrons between two atoms of the same element.
An ionic bond takes place between
two metals.
two nonmetals.
a metal and a metalloid.
a metal and a nonmetal.
How do electrons move in a metallic bond?
freely around all of the atoms
around only the heaviest atoms
around only atoms with small diameters
tightly around the atom with the most bonds
Which rule must be fulfilled by sharing or transferring electrons to create bonds in order for an element to be stable?
octet rule
ionic rule
septet rule
covalent rule
Covalent bonds take place between
a metal and a nonmetal.
a metal and a metalloid.
two nonmetals.
two metals.
How many pairs of electrons are shared in a double covalent bond?
1
2
3
4
How many electrons do hydrogen atoms seek to obtain in their valence shell?
2
1
3
4
