Answer:
A
Explanation:
velocity is a vector quantity, it has single direction.
B and C are speed while D is acceleration
Please recheck, for this may not be the correct answer
Answer:
pH = 3,38
Explanation:
The reaction of HNO₃ with NaF is:
HNO₃ + NaF → HF + NaNO₃
If you have 1L of 0,120M NaF, moles of NaF are 0,120 moles. These moles reacts with 0,020 mol of HNO₃ to produce 0,020 moles of HF. That means the final concentrations of HF and NaF are:
HF: 0,100mol + 0,020 mol = <em><u>0,120 mol</u></em>
NaF: 0,120mol - 0,020 mol = <em><u>0,100 mol</u></em>
<em><u /></em>
Now, to obtain the pH of this buffer (Weak acid + conjugate base) you can use Henderson-Hasselblach formula:
pH = pka + log₁₀ [NaF] / [HF]
Replacing:
pH = 3.46 + log₁₀ [0,100] / [0,120]
<em>pH = 3.38</em>
<em></em>
I hope it helps!
Answer: The final temperature of the gas is 7.58 °C.
Explanation: We are given initial and final pressure of the system and we need to find the final temperature of the system.
To calculate it, we use the equation given by Gay-Lussac.
His law states that pressure is directly related to the temperature of the gas.
Or,
where,
= initial pressure = 893 mmHg = 1.175atm (Conversion factor: 1atm = 760mmHg)
= initial temperature = 49.3°C = [49.3 + 273.15]K = 322.45K
= Final pressure = 778mmHg = 1.023atm
= Final temperature = ?°C
Putting values in above equation, we get:
Converting Final temperature from kelvin to degree Celsius.
Hence, the final temperature of the gas is 7.58 °C.
He ability to rust is a chemical property of iron. The metal silver does not rust, but eventually a darker substance called tarnish forms on its surface. The chemical properties of copper cause it to become a blue-green color when it is exposed to air