More Balancing Equations,Energy & Phases in Equations
Classifying Reactions
100
The substances that exist before a chemical reaction
What are Reactants
100
The difference between the symbol for the element oxygen and the formula for oxygen gas
What is symbol O and formula O2?
100
An equation where there are the same number of atoms of each element on both sides of the equation
What is a balanced equation
100
Three steps in writing a balanced formula equation
What is
Write word equation;
Write formulas
Adjust coefficients
100
The four categories of chemical reactions are
What are:
Single replacement
Synthesis
Decomposition
Double replacement
200
The new substances that are formed during the chemical changes
What are Products
200
The difference between the meaning of 2CO and CO2 is
What is
Two molecules of carbon monoxide and one molecule of carbon dioxide
200
The reason why a chemical equation must be balanced to properly represent a chemical reaction
What is atoms are conserved in a chemical reaction
200
Using proper coefficients for balancing Na + O2 ---> Na2O will result in this balanced equation
What is '2Na + O2 ---> 2Na2O'
200
The category of these three chemical reactions below:
a) 2CaO(s) + H2O(s) --->CaOH)2(s)
b) 2H2(g) +O2(g) --->2CO2(g)
c) CO (g) + O2(g) ---> 2CO2(g)
What is Synthesis reaction
300
The word equation for "silver + sulfur----> silver sulfide"
What is "silver reacts with sulfur to yield (produce) silver sulfide"
300
The meaning of 2Na + Cl2 ------> 2NaCl is
What is two atoms of sodium plus one molecule of chlorine gas produce two formula units of sodium chloride
300
Number of atoms of each element in NH3
What is 5N and 15H
300
Release of heat by a chemical reaction is indicated by
What is ' plus energy on the right'
300
The category of these three chemical reactions below:
2HgO(s) ---> 2Hg(l) + Cl2(g)
2NaCl(s) ---> 2Na(l) + Cl2(g)
What is
Decomposition reaction
400
The reactants and products in the equation "H20 ------>H2(g) +O2(g)
What is water and what are hydrogen and oxygen
400
The meaning of 2KClO3 + Cl2 --->2KCl + 3O2is
What is two formula units of potassium chlorate plus one molecule of chlorine gas produce two formula unites of potassium chloride and three molecules of Oxygen gas
400
Number of atoms of each element in 4Ca(OH)2
What is 4Ca; 8O; 8H
400
The reaction:
2Na (s) + 2H2O ---> 2NaOH(q) + H2 (g) + energy is an example of an
What is exothermic reaction
400
The category of these three chemical reactions below:
NaOH(aq) + HCl(aq) ---> NaCl(aq) + H2O(l)
NH4Cl(aq) + NaOH(aq) ---> NH4OH(aq) + NaCl(aq)
What are
Double replacement reactions
500
The formula equation for when sodium chloride is decomposed to produce sodium metal and hydrogen gas
What is NaCl(s) ------>Na(s) + H2 (g)
500
Whereas formula units applies to ionic substances
What is molecular molecular substances
500
One balanced equation below:
a) Zn + 2HCl ---> ZnCl2 + H2
b) H2SO4 + 2NaOH ---> H2O +NaSO4
c) Pb(NO3)2 + 2NaI ---. PbI2 + NaNO3
What is (a)
500
The meaning of each of these: HBr(aq); CO2(s; CO2 (g)
What is
Hydrogen bromide dissolved in water;
solid carbon dioxide
gaseous carbon dioxide
500
The category of these three chemical reactions below:
Cl2(g) + 2NaBr(aq) ---> Br (l) + 2NaCl(aq)