chemical reactions test chemistry
The formation of a solid product in a chemical reaction is represented by the symbol
(s)
When the following equation is balanced, what is the coefficient for HCl? Mg(s)+HCl(aq)→MgCl2(aq)+H2(g)
2
What are the missing coefficients for the skeleton equation below? Cr(s)+ Fe(NO3)2(aq) → Fe(s)+ Cr(NO3)3(aq)
2,3,3,2
Which equation is not balanced?
2H2 + O2 → H2O
When potassium hydroxide and barium chloride react, potassium chloride and barium hydroxide are formed. The balanced equation for this reaction is ____.
2KOH+BaCl2→2KCl+Ba(OH)2
When the equation Fe +Cl2→ FeCl3 is balanced, what is the coefficient for Cl2?
3
If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be? nitrogen trifluoride → nitrogen + fluorine
3F2
Which of the following equations represents the balanced equation for the reaction of iron and oxygen?
4Fe+ 3O2 → 2Fe2O3
In order for the reaction 2Al+6HCl→2AlCl3+3H2 to occur, which of the following must be true?
Al must be above H on the activity series
What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide?
Br2+2NaI→2NaBr+I2
In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
H2
What does a triangle symbol over an arrow in a chemical reaction mean?
Heat is supplied to the reaction
Which of the following is true regarding the law of conservation of mass?
It dictates that the number of atoms of each element must be the same on both sides of a chemical equation.
Which equation below violates the law of conservation of mass?
KCl+Br2→KBr+ Cl2
In the chemical equation 2Mg(s) + O2(g) → 2MgO(s)
Mg represents the reactant magnesium
Using the activity series, determine which of the following reactions is possible.
Na(s) + H2O(l)
Using the activity series, predict which of the following reactions cannot occur.
Na(s) + KBr(aq)
In the word equation, sodium oxide + water →sodium hydroxide, the formula for sodium hydroxide is represented by
NaOH
How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water?
O2
Which of the following is a balanced equation representing the decomposition of lead(IV) oxide?
PbO2→Pb+O2
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?
Solution A, solution B, and the mixture are all yellow.
A chemical formula written over an arrow in a chemical reaction signifies
a catalyst for the reaction
What is the small whole number that appears in front of a formula in a chemical equation?
a coefficient
What is the name of a list of elements arranged according to the east with which they undergo certain chemical reactions?
activity series
a list of metals in order of decreasing reactivity
activity series of metals
To balance a chemical equation, you must
adjust the coefficients
For the written part of the test I will need to know:
all of the above
Which of the following may indicate that a chemical reaction has occurred?
all of the above
an equation in which each side has the same number of atoms of each element
balanced equation
Which observation does not indicate that a chemical reaction has occurred?
change in total mass of substances
The equation 2C3H7OH+9O2→6CO2+8H2O is an example of which type of reaction?
combustion reaction
a reaction in which oxygen reacts with another substance, often producing heat or light
combustion rection
The equation AX→A+X is the general equation for a
decomposition reaction
a reaction in which a single compound is broken down into simpler substances
decomposition reaction
In a chemical equation, the symbol (aq) indicates that the substance is
dissolved in water
The equation H3PO4+ 3KOH →K3PO3+ 3H2O is an example of which type of reaction?
double-replacement reaction
A catalyst is ______.
not used up in a reaction
When a slightly soluble solid compound is produced in a double-displacement reaction, a
precipitate is formed.
a new substance formed in a chemical reaction
product
a starting substance in a chemical reaction
reactant
The equation A+BX→AX+B is the general equation for a
single-displacement reaction.
a reaction in which the atoms of one element replace the atoms of a second element in a compound
single-replacement reaction
a chemical equation that does not indicate relative amounts of reactants and products
skeleton equation
In what kind of reaction do two or more substances combine to form a new compound?
synthesis reaction
The equation A+X→AX is the general equation for a(n)
synthesis reaction
The reaction 2Fe+ 3Cl2 → 2FeCl3 is an example of which type of reaction?
synthesis reaction
Chemical equations must be balanced to satisfy _____.
the law of conservation of mass.
In a chemical reaction
the mass of the reactants equals the mass of the products.
The word equation solid carbon + oxygen gas → carbon dioxide gas + energy, represents a chemical reaction because
the reaction releases energy.
The activity series helps to predict
whether or not a specific chemical reaction is possible.