Answer:
2NO + 4H-> N2 + 2 H2O
Explanation:
Both sides must be equal. :)
Answer:
1) after 10.0 mL base added the pH is 4.75
2) after 20.0 mL base added the pH is 8.74
3) after 30.0 mL base added the pH is 12.36
Explanation:
CH₃COOH + NaoH --------------> CH₃COONa + H₂O
1) after 10.0 mL base added
millimoles of NaOH = 10.0 x 0.125 = 1.25
2.50 - 1.25 = 1.25 means 50% titration complete.
at half equivalence point pH = pKa
pH = 4.75
2) millimoles of NaOH added = 20.0 x 0.125 = 2.50
equivalence point
[CH₃COONa] = 2.50 / 20 + 25 = 0.055 M
pH = 1/2 [pKw + pKa + log C]
pH = 1/2 [14 + 4.75 + log 0.055]
pH = 8.74
3) millimoles of NaOH added = 30.0 x 0.125 = 3.75
3.75 - 2.50 = 1.25 millimoles NaOH left
[NaOH] = 1.25 / 30 + 25 = 0.023 M
as NaOH is strong base
[OH-] = [NaOH] = 0.023 M
pOH = - log [OH-]
pOH = - log [0.023]
pOH = 1.64
pH = 14 - 1.64
pH = 12.36
Answer:
Exolaiend in explanation section
Explanation:
First of all, the automatic hammer is used to drive nails into tight spaces where where we can't get a sufficient striking force if we are to use a normal regular hammer in driving the nail.
So the nail to be driven is lifted out of rest(it's position). The energy here is gravitational potential energy.
Now, when it is driven into the tight spaces, the gravitational energy would be converted to kinetic energy due to the motion and speed involved.
1. Change in color
2. Formation of bubbles
3. Formation of a precipitate
4. Begins to make an odor
Answer:
a) decrease
b) increase
c) decrease
Explanation:
a) The density of water <u>decreases</u> as water changes from liquid to steam.
The density of substances are higher when their molecules are very close to each other having strongest bonding forces. When water is change from liquid to steam it means water molecules are not close to each other as they are in liquid state because now water is changed into gaseous form and molecules are further apart from each other. Thus, density goes to decrease.
b) As the temperature increases, the rate of diffusion of a gas<u> increase.</u>
As temperature increases molecules gets more kinetic energy and rate of diffusion increases.
c) At constant volume, if the temperature of a gas is decreases, its pressure <u>decreases.</u>
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
As temperature decreases its pressure also goes to decrease and vice versa.