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WorksheetsChemistry: chapter 8
Total questions: 21
Worksheet time: 11mins
Predict the product(s): H₂O -->
H and O
H and OH
HOH
H₂ and O₂
A chemical formula written over the arrow in a chemical equation signifies
The formation of a gas.
A catalyst for the reaction
An impurity.
A by-product.
Which of the following is true regarding single-displacement reactions?
Only one product is formed
There is only one reagent
It requires oxygen
One element replaces another in a compound
In which type of reaction do two or more compounds react to form one product?
synthesis
decomposition
combustion
single-displacement
In the expression 3CO₂, the numbers 3 and 2 are, respectively,
a subscript and a coefficient.
two subscripts.
a coefficient and a subscript.
two coefficients.
Which of the following equations represents the balanced equation for the reaction of iron and oxygen?
2Fe + O₂ → Fe₂O₃
Fe + 3O₂ → Fe₂O₃
3Fe + 3O₂ → 2Fe₂O₃
4Fe + 3O₂ →2Fe₂O₃
The equation AX + BY → AY + BX is the general equation for a*
Double-displacement reaction
Decomposition reaction
Single-displacement reaction
Synthesis reaction
Which of the following indicates that a chemical equation is balanced?*
The numbers of molecules on each side of the equation are equal.
The numbers of atoms of each element are the same on both sides of the equation.
The sums of the coefficients on each side of the equation are equal.
All of the coefficients are the same.
Which equation below violates the law of conservation of mass?*
2H₂ + O₂ → 2H₂O
KCl + Br → KBr + Cl₂
2Fe₂O₃ + 3C → 4Fe + 3CO₂
Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂
The formation of an aqueous product in a chemical reaction is represented by the symbol
(aq).
(s).
(g)
(I)
What type of chemical reaction does the following chemical equation represent?
2HCl(aq) + Cr(s) → H₂ (g) + CrCl₂ (aq)
composition
decomposition
single-displacement
double-displacement
Which coefficients correctly balance the formula equation below?
KClO₃ (s)→ KCl(s) + O₂ (g)
1, 1, 1
2, 1, 1
1, 1, 3
2, 2, 3
To balance a chemical equation, you must*
adjust the coefficients.
adjust the number of products.
adjust the number of reactants.
adjust the subscripts.
You mix solution A with solution B in a beaker. Which of the following observations does not help you prove that a chemical reaction has occurred?
The beaker becomes warm.
You see gas bubble out of solution.
Solution A and solution B when mixed turn yellow.
None of the above; all help prove that a chemical reaction has occurred.
You mix solution A with solution B in a beaker. Which of the following observations does not help you prove that a chemical reaction has occurred?
The beaker becomes warm.
You see gas bubble out of solution.
None of the above; all help prove that a chemical reaction has occurred.
Solution A and solution B when mixed turn yellow.
What type of chemical reaction is represented by the following word equation? iron + oxygen →iron(II) oxide
synthesis
double-displacement
replacement
combustion
When a solid produced by a chemical reaction separates from the solution it is called
A reactant.
A precipitate.
A molecule.
The mass of the product
From a complete and correctly written chemical equation, you can obtain the*
chemical formulas of the reactants and products.
relative amounts of the reactants and products.
physical states of the reactants and products.
All of the answers
A chemical equation is balanced when the*
subscripts of the reactants equal the subscripts of the products.
products and reactants are the same chemicals.
same number of each kind of atom appears in the reactants and in the products.
coefficients of the reactants equal the coefficients of the products.
In the chemical equation 2Mg(s) + O₂ (g) → 2MgO(s),
Mg represents the product magnesium.
the reaction yields magnesium.
Mg represents the reactant magnesium.
O2 represents the product oxygen gas.
When a binary compound decomposes, what is produced?
Two elements
An acid
A tertiary compound
An oxide
