Chemical Applications
Which set of coefficients balance the following chemical equation? ___N2+___H2=___NH3
1,3,2
When the hydronium ion concentration is 1x10^-13 mol, the pH of the solution is,
13
Whats the mass of a single molecule of ammonia, NH3, in atomic mass units
17 amu
How much energy is release upon the formation of the bonds within 1 mole of hydrazine, N2H4?
1715 kJ
Which set of coefficients balances the following chemical equation? ___NaClO3=___NaCl+___O2
2,2,3
pH of 1x10^-3M
3
Which has the greatest number of atoms? 64 g fluorine 2 76 g oxygen 2 32 of methane 4
32 g of methane 4.
Which set of coefficients balance the following chemical equations? ___PH3+___O2=___P4O10+___H2O
4,8,1,6
If we combine oxygen and hydrogen gas together to make water, and we want to completely use 5 grams of hydrogen gas, how many grams of oxygen gas do we need?
40 grams of oxygen gas
To make carbon dioxide gas CO2, we need to react 12 grams of carbon with how many grams of oxygen
44 grams
How many molecules is the concentration of water, H2O, in units of moles per liter?
55.6 M
pH of 1x10^-6 M
6
When the hydroxide ion concentration is 1x10^-5 what is the pH of the solution
9
Hyrdorxide ion concentrations in an aqueous solution with a pH of 4, how many moles?
C= 1x10^-10 M
What salt is formed when a solution of calcium hydroxide, CA(OH)3, is neutralized by hydrochloric acid, HCI?
CaCl2
Product of reaction between carbon dioxide and water
H2CO3
A base dissolved in water liberates
HO-
A substance whose formula does not contain OH, yet yields basic solution when dissolved in water is
NH3
You are given 5 g of two different chemical. which of the following statements is true?
One sample contains more molecules than the other
Unsaturated fatty acid reacts with hydrogen to form a saturated fatty acid, what to place?
Reduction
What would happen to dissolved carbon dioxide if you were to increase the pH of the sample?
The concentration of dissolved CO2 would increase because the acid forms in neutralized
We measure acidity of a solution by measuring the concentration of hydronium ions, H3O. What does it mean to say one has a neutral solution?
The concentration of hydronium ions equals the concentration of hydroxide, OH- ions.
Which is true of a reaction that has reached chemical equilibrium?
The forward reaction rate is equal to the reverse reaction rate
Why is carbon dioxide able to be stored more effectively in ocean water vs. fresh water?
The pH of the ocean is pretty high and so the carbon dioxide is trapped in a neutralization reaction
A pH of 7 signifies
a neutral solution
If you had 1 mole of marbles, how many marbles would you have
a very large number
Forms negative ions
acid
When a chemical loses hydrogen ions it is behaving like a,
acid
When a chemical gains hydrogen ions it is behaving like a,
base
When a ion concentration solution increases the pH
decreases
If something dissolves easily in water it,
has a strong electrical current
If something does not dissolve easily in water it,
has a weak electrical current
The difference between an exothermic and endothermic reaction is that an exothermic reaction,
has energy as a product, and an endothermic reaction has energy as a reactant
A chemical is most likely to behave as an acid when
it has a strong attraction for hydrogen ions
electronegativity increases from
left to right, bottom to top
What is the source of acid rain?
none of the above
to say a chemical equation is balanced means the
number of times each element appears as a reactant is equal to the number of times it appears as a product
rank by acidity, least to greatest ocean water rainwater purewater acid rain
ocean water pure water rainwater acid rain
When an acid and base react to form salt, the base forms
positive ions
To say that an acid is stron in aqueous solutions means that acid
produces a large concentration of hydronium ions
Since Kw is so very
small, pure water ionizes only to a small extent
Lakes lying in granite basins, such as those in the nnortheastern US, tend to become acidified by acid rain more readily because
the limestone, which is calcium carbonate, serves to neutralize the acid in the rain.
in a battery the anode is near
the oxidation
In a battery the cathode in near
the reduction
How might warmer oceans accelerate global warming
the solubility CO2 in water decreases as temperature rises.
