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60 questions
In Chemical Equations the Reactants are on the __________ side.
In Chemical Equations the Products are on the ________ side.
What are the Reactants in this Chemical Equation?
CH4 + 2O2
CO2 + 2H2O
CO2 + 2O2
CH4 + 2H20
What are the Products in this Chemical Equation?
CH4 + 2O2
CO2 + 2H2O
CH4 + 2H2O
2O2 + CO2
A shorthand representation of an element or compound using chemical symbols.
Chemical Equation
Chemical Formula
Molecule
Subscript
A representation of a chemical reaction using chemical symbols for elements and compounds.
Chemical Formula
Chemical Equation
molecule
subscript
Two more atoms chemically combined.
atom
subscript
coefficient
molecule
The number written after an element’s symbol in a chemical formula that indicates the number of atoms of a specific element.
coefficient
subscript
The number in front of an element or compound that indicates the number of molecules in a chemical formula.
coefficient
subscript
The number of atoms for each element are equal for the reactants and products.
balanced equation
unbalanced equation
The number of atoms for each element are not equal for the reactants and products.
balanced equation
unbalanced equation
The Law of Conservation of Mass states that:
Matter cannot be created or destroyed – the mass of the products in a chemical reaction must be equal to the mass of the reactants.
True
False
A type of reaction in which two or more substances combine and form one compound is a _________ reaction.
decomposition
synthesis
single replacement
double replacement
One element replaces another element in a compound in this type of reaction.
synthesis
decomposition
double replacement
single replacement
A substance that increases reaction rate by lowering the activation energy of a reaction
enzyme
inhibitor
catalyst
coefficient
Chemical reactions that absorb thermal energy are _____________ reactions.
exothermic
endothermic
synthesis
decomposition
A description of a reaction using symbols and chemical formulas
reactant
product
chemical reaction
chemical equation
A chemical reaction that releases thermal energy
exothermic
endothermic
single replacement
double replacement
A process in which atoms of one or more substances rearrange to form one or more new substances
chemical reaction
chemical production
physical change
chemical change
A chemical reaction in which a substance combines with oxygen and releases energy
synthesis
combustion
endothermic
decomposition
Balance this equation:
HgO ---> 2Hg + O2
It is balanced.
2HgO ---> 2Hg + O2
2HgO ---> Hg + O2
HgO ---> Hg + 2O2
Balanced this equation:
Sb2S3 + O2 ---> Sb + SO2
It is balanced.
Sb2S3 + O2 ---> 2Sb + SO2
Sb2S3 + 3O2 ---> 2Sb + 3SO2
3Sb2S3 + 3O2 ---> 2Sb + SO2
Which is the correct chemical equation for the following: Solid Zn reacts with silver (I) chloride to produce Zinc (II) chloride and silver metal
Zn + AgCl → ZnCl2 + Ag
ZnCl2 + Ag → Zn + AgCl
ZnCl2 + Ag2 → Zn + AgCl
Zn2Cl + Ag → Zn + AgCl
Which is the correct chemical equation for the following: Barium Chloride combined with sodium sulfide yields barium sulfide and sodium chloride
BaCl + NaS → BaS+ NaCl
BaCl2 + Na2S → BaS+ NaCl
BaS+ NaCl → BaCl + NaS
BaCl2 + Na2S → BaS+ NaCl2
Magnesium can be burned in oxygen to produce solid magnesium oxide.
Mg(s) + O2(g)→ MgO(s)
Mg(s) + O(g) → MgO(s)
Mg(s) + CO2(g) → MgO(s) + C(s)
Mg(s) + O2(g) → Mg2O2(s)
True/False: There are 2 reactants in the chemical equation below.
KClO3 → KCl + O2
True
False
Translate the word equation below:
Nitrogen reacts with Hydrogen to form Ammonia (NH3).
N → H + NH3
N2 + H2 → NH3
N + H → NH3
N2 → H2 + NH3
Translate the word equation below.
Hydrogen and Carbon Dioxide react to form Carbonic Acid (H2CO3).
H + CO2 → H2CO3
H → CO2 + H2CO3
H2 + CO2 → H2CO3
H2 → CO2 + H2CO3
All of the following are chemical reactions EXCEPT ___
A. burning of paper
B. potassium fluoride and calcium nitrate are mixed.
C. sodium hydroxide is added to nitric acid
D. freezing of potassium nitrate solution.
Which of the following changes would you consider to be a chemical change?
A. Candle wax solidifies when it is cooled.
B. Baking soda is combined with vinegar
C. Ice melts.
D. Paper turned into pieces.
Balancing a chemical equation involves ____
A. adjusting the subscripts
B. adjusting both subscripts and coefficients
C. adjusting the coefficients
D. adjusting the masses of reactants and products
What is the name of Br6F10 ?
Bromium fluoride
Hexabromine fluoride
Bromium decafluoride
Hexabromine decafluoride
The formula of magnesium chloride is
MgCl
MgCl2
MgCl3
The formula of sodium carbonate is
NaCO3
Na(CO3)2
Na2CO3
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