Chemistry Chemical Reactions
violates KCl + Br → KBr + Cl₂
Which equation below VIOLATES the law of conservation of mass?
NOT balanced 2H₂ + O₂ → H₂O
Which equation is NOT balanced?
4Fe + 3O₂ → 2Fe₂O₃
Which of the following equations represents the balanced equation for the reaction of iron and oxygen?
One element replaces another in a compound.
Which of the following is true regarding single-displacement reactions?
The unknown metal is higher on the activity series than zinc, but below sodium.
You have an unknown metal, X. You conduct two experiments. The results are shown in the table below. Procedure Result X(s) + NaCl(aq) no reaction X(s) + ZnCl₂(aq) reaction of metal Which of the following statements is a logical conclusion based on the experimental data?
2 Mg(s) + O₂(g) → 2 MgO(s)
solid magnesium + oxygen gas → solid magnesium oxide
2 NaI(s) + Cl₂(g) → 2 NaCl(s) + I₂(l)
solid sodium iodide + chlorine gas → solid sodium chloride + liquid iodine
Zn(s) + 2 HCl(aq) → ZnCl₂(aq) + H2(g)
solid zinc + aqueous hydrochloric acid → aqueous zinc chloride + hydrogen gas
double-displacement reaction.
In a reaction, the ions of two compounds exchange places in aqueous solution to form two new compounds. This reaction is called
below it on the list.
In a single-displacement reaction, an element in the activity series most likely can replace any element
a coefficient and a subscript.
In the expression 3CO₂, the numbers 3 and 2 are, respectively,
synthesis
In which type of reaction do two or more compounds react to form one product?
indicate the number of moles of each substance that react.
The coefficients in a chemical equation
electrolysis.
The decomposition of a substance by an electric current is called
the reaction is reversible.
The double arrow in a chemical equation means
single-displacement
What type of chemical reaction does the following chemical equation represent? 2HCl(aq) + Cr(s) → H₂(g) + CrCl₂(aq)
synthesis
What type of chemical reaction is represented by the following word equation? iron + oxygen → iron(II) oxide
2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)
Which coefficients correctly balance the formula equation below? __ KClO₃(s) → __ KCl(s) + __ O2(g)
combustion
A mixture of propane and oxygen react to form carbon dioxide and water. What type of chemical reaction is this?
(aq).
In a chemical equation, the formula of a substance dissolved in water solution is uses this symbol.
activity series
A(n) ___ orders the elements by the ease with which they undergo certain chemical reactions.
A. Na(s) + H₂O(l) →(cold )
A. Using the activity series, determine which of the following reactions is possible.
single displacement 3Ca(s) + Al₂(SO₄)₃(aq) →
According to the activity series, which of the following single-displacement reactions can occur?
B. 2Cr(s) + SnCl₄(aq) →
B. Using the activity series, predict which of the following reactions can occur.
C. Ca(s) + MgCl₂(aq) →
C. If calcium is listed above magnesium in the activity series and magnesium is listed above zinc, which of the following reactions is possible?
decomposition
Calcium carbonate, CaCO₃, reacts to form calcium oxide, CaO, and carbon dioxide, CO₂. What type of reaction is this?
(l)
In a chemical equation, the formula of a substance as a liquid is followed by the symbol
CaCO₃(s) → CaO(s) + CO₂(g)
Solid calcium carbonate → solid calcium oxide + carbon dioxide gas
2 ZnS(s) + 3 O₂(g) → 2 ZnO(s) + 2 SO₂(g)
Solid zinc sulfide + oxygen gas → solid zinc oxide + sulfur dioxide gas
whether or not a specific chemical reaction is possible.
The activity series helps to predict
(s).
The formation of a solid product in a chemical reaction is represented by the symbol
precipitate.
The production of a slightly soluble solid compound in a double-displacement reaction results in the formation of a
are heated.
The symbol arrow with a Greek delta symbol above it means that the reactants
interval between any two elements in the activity series increases.
The tendency for a replacement reaction to occur increases as the
coefficients.
To balance a chemical equation, you must adjust the
Cl₂(g) + 2 KBr(aq) → 2 KCl(aq) + Br₂(l)
chlorine gas + aqueous potassium bromide → aqueous potassium chloride + liquid bromine
