Module 8 - Chemical Equations V5 Flashcards
What separates individual reactants and products in a chemical equation?
a plus sign
A product is a substance which is generated as a result of a chemical reaction.
true
Chemical equations refer to the written form of a chemical reaction.
true
The formula mass of a compound is the sum of the atomic weights of each element in its chemical formula.
true
What information is not needed to calculate percent composition?
the state of matter of the compound
The molecular mass applies to ionic compounds.
false
Coefficients refer to the amount of a specific atom.
false
What is the balancing coefficient of O2 in the following equation?
CH4(g) + ?O2(g) → CO2(g) + H2O(l)
2
An equation is balanced when both the reactant side and the product side of the reaction have unequal numbers of each type of atom.
false
Atomic mass and molecular mass have the same units.
false
The molar mass is the mass of one mole of a given substance.
true
What are the units of molar mass?
g/mol
A + BX → B + AX is the general formula for a single replacement reaction.
true
Decomposition reactions occur when an element which is more reactive takes the place of one which is less reactive, thus resulting in two new compounds.
false
Predict the products of the following combination reaction.
C(s) + O2 →
CO2
Which is not a type of yield?
limiting reactant
The actual yield is the actual amount of product obtained from a chemical equation.
true
The limiting reactant is the reactant which is not consumed.
false
Every chemical reaction will have __________ and __________.
reactants; products
Chemical equations always include an arrow signifying what?
the direction of the reaction.
Coefficients can be represented as…
whole numbers.
The state of matter is never included in chemical equations.
false
Glass is a common material used for windows and screens and can be created from silicon dioxide, SiO2. What is the formula mass of silicon dioxide?
60.06amu
Aspirin is a common medicine to treat pain relief related to issues such as headaches and toothaches. The chemical formula for aspirin is C9H8O4. What is the most accurate percent composition of carbon in aspirin?
60%
Potassium oxide (K2O) is often used in agriculture as a fertilizer. Which represents a balanced chemical equation for producing potassium oxide?
4K + O2 → 2K2O
Incomplete combustion happens when there is an insufficient supply of air. This is dangerous because it produces carbon monoxide, or CO, a poisonous gas. What is the balancing coefficient for carbon monoxide in the incomplete combustion of propane gas?
2 C subscript 3 H subscript 8 plus 9 O subscript 2 rightwards arrow 4 C O subscript 2 plus ? C O plus 8 H subscript 2 O plus H e a t
2
The __________ is a unit of measure for the number of atoms in a sample.
mole
One mole is equivalent to…
6.022 x 1023 atoms.
Hydrogen and oxygen (O2) react to form liquid water. If there are 10 grams of oxygen reacting with hydrogen, how many moles of oxygen would be in the resulting water product?
0.31 moles
Hydrochloric acid (HCl) is intense and can burn through materials as a component used in batteries and fireworks. The balanced equation for the production of hydrochloric acid is:
H subscript 2 plus C l subscript 2 rightwards arrow 2 H C l
How many molecules of HCl are produced from 0.35mol of H2?
4.2 x 1023 molecules
__________ reactions occur when a single reactant breaks into multiple products.
decomposition
B a C l subscript 2 left parenthesis a q right parenthesis plus N a subscript 2 S O subscript 4 left parenthesis a q right parenthesis rightwards arrow B a S O subscript 4 left parenthesis s right parenthesis plus 2 N a C l left parenthesis a q right parenthesis
This is an example of a __________ reaction.
double replacement
Combustion reactions always produce…
carbon dioxide and water.
What are the products in a reaction between copper (Cu) and silver nitrate (AgNO3)?
C u plus 2 A g N O subscript 3
2Ag + Cu(NO3)2
When a reaction produces a single product, a __________ reaction has occurred.
combination
If there are 5 moles of sodium and 8 moles of chlorine reacting to create table salt, NaCl, what is the limiting reactant?
2 N a open parentheses s close parentheses plus C l subscript 2 open parentheses g close parentheses rightwards arrow 2 N a C l open parentheses s close parentheses
Na
A solution of nickel sulfide (NiS) with a mass of 8.5g was created using 4.4g of nickel and excess of sulfur. Calculate the theoretical yield of NiS.
S plus N i rightwards arrow N i S
6.8g NiS
Calcium carbonate decomposes into calcium oxide and carbon dioxide. What is the percent yield if a sample of calcium carbonate with a mass of 38g yields 20g of carbon dioxide?
CaCO subscript 3 rightwards arrow CaO plus CO subscript 2
83%
