unit 5 quiz
how many atoms of oxygen are represented in 2 Ca(NO3)2
12
in writing an equation that produces hydrogen gas the correct representation of hydrogen gas is
H2
the word equation "magnesium reacts with chlorine to produce magnesium chloride" would be represented by which of the following formula equations?
Mg + Cl2 ——> MgCl2
which is the general form of single replacement reaction
a + bx —-> ax + b
After the first steps in writing an equation, the equation is balanced by
adjusting coefficients to the smallest whole number ration
according to the law of conversation of mass the total mass of the reacting substances is
always equal to the total mass of the products
which of the following symbols means the substance is in water solution
aq
in a chemical equation, the symbols that take place of the word yields is the
arrow
what is the general form for double replacement reaction
ax + by —> ay + bx
in a reaction in which hydrogen reacts with oxygen to product water, which substances are the reactants?
both hydrogen and oxygen
in a chemical equation, the number of molecules of a given substance is indicated by
coefficient
to balance a chemical equation it may be necessary to adjust the
coefficients
which of the following is not an example of a chemical change
cutting paper
the reaction 2KClO —-> 2KCl + 3O2
decomposition
the reaction to HGO —> 2HG + O2 is
decomposition
the reaction Pb(NO3)2 + 2KI —>PBI2 + 2KNO3
double replacement
after the correct formula for a reactant had been written the
formula should not be changed
the equation 2Al + 3Fe(NO3)2 —-> 3Fe + 2Al(NO3)3
iron has been replaced by aluminum
the formula equation to Mg + O2 —-> 2MgO the word equation would begin
magnesium plus oxygen
in one type of the synthesis reaction, an element combines with oxygen to yield
oxide
in a chemical equation, the symbol that takes place of the words reacts with is
plus sign
a solid produced by a chemical reaction in a solution that separates from the solution is called
precipitate
a substance that enters into a chemical reaction is called a
reactant
the reaction Mg + 2HCl —> H2 + MgCl2 is a
single replacement
the symbol s written after the formula in a chemical equations stands for
solid
when oxygen is available, sulfur dioxide is produced from the burning sulfur. which of the following word equations best represents this reaction?
sulfur + oxygen ——> sulfur dixoxide
what kind of reaction is represented by the equation C2Cl4 + Cl2 —> C2Cl6
synthesis
the reaction to Mg + O2 —-> 2 MgO is a
synthesis reaction
which of the following is true of a balanced equation
the number of atoms of each of each elemts remain the same
a chemical reaction has not occurred if the products have
the same chemical properties as the reactants
in a chemical reaction, what is the relationship between the total mass of the reactants and the total mass of the products
they must be equal
in balancing a chemical equation, which of the following are you allowed to do
write coefficients
