Chem chap 6 - balancing equations and formulae Flashcards
How many carbon atoms, oxygen atoms and carbon dioxide molecules are in CO2?
One carbon atom, 2 oxygen atoms and one carbon dioxide molecule
What are monoatomic elements?
Elements that exist as uncombined atoms
What group of elements exist as monoatomic elements and why?
Group 18 elements as they are unreactive
What are diatomic molecules and give an example.
Molecules that exist as two chemically combined atoms
Hydrogen gas H2
Oxygen gas O2
F2 Cl2 I2 N2 Br2
What are polyatomic molecules and give an example.
Molecules that exist as or more combined atoms
S8 P4
Ozone O3
Do mixtures and compounds have fixed formulae?
Compounds have fixed formulae but mixtures have unfixed formulae
What is the overall charge and formula of ammonium
+
NH4+
What is the overall charge and formulae of hydroxide and nitrate
-
OH- NO3-
What is the overall charge and formulae of sulfate and carbonate?
SO4 2-
CO3 2-
What is the overall charge and formula of phosphate?
PO4 3-
In this equation: Na + Cl -> NaCl, which is the reactants and products
Sodium and chloride reactants
Sodium chloride product
What is the use of chemical equations?
Shows the physical states of the substances at room temperature and pressure using state symbols
What makes a compound aqueous?
The compound is dissolved in water
In the equation: HCl(aq) + NaOH(aq) -> NaCl(aq) + H2O(l), why is sodium chloride formed in the aqueous state?
It is found in the resulting solution where the solvent is water
Balance the equation : H2 +O2 → H20
Step 1:
LHS - 2H 2O
RHS - 2H 1O
Step 2:
H2 +O2 → 2(H20)
LHS - 2H 2O
RHS - 4H 2O
2(H2) +O2 → 2(H20)
LHS - 4H 2O
RHS - 4H 2O
Step 3:
2(H2)g +O2g → 2(H20) l
