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3 years ago

The moon cannot be seen during which phase?

Chemistry

2 answers:

ycow [4]3 years ago

8 0

New moon is the phase in which it cannot be seen

Andrews [41]3 years ago

3 0

New Moon. The Moon's unilluminated side is facing the Earth. The Moon is not visible except during a solar eclipse. The lighted side of the Moon faces away from the Earth. This means that the Sun, Earth, and Moon are almost in a straight line, with the Moon in between the Sun and the Earth.

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Help help help :/ Please

krok68 [10]

Super giants have the greatest luminosity!

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2 years ago

Use the Henderson-Hasselbalch equation, eq. (3), to calculate the pH expected for a buffer solution prepared from this acid and

notka56 [123]

Answer:

$pH=4.56$

Explanation:

Hello there!

In this case, given the Henderson-Hasselbach equation, it is possible for us to compute the pH by firstly computing the concentration of the acid and the conjugate base; for this purpose we assume that the volume of the total solution is 0.025 L and the molar mass of the sodium base is 234 - 1 + 23 = 256 g/mol as one H is replaced by the Na:

$n_{acid}=\frac{0.2g}{234g/mol}=0.000855mol\\\\n_{base}= \frac{0.2g}{256g/mol}=0.000781mol$

And the concentrations are:

$[acid]=0.000855mol/0.025L=0.0342M$

$[base]=0.000781mol/0.025L=0.0312M$

Then, considering that the Ka of this acid is 2.5x10⁻⁵, we obtain for the pH:

$pH=-log(2.5x10^{-5})+log(\frac{0.0312M}{0.0342M} )\\\\pH=4.60-0.04\\\\pH=4.56$

Best regards!

6 0

1 year ago

PLEASE HELP! List the 5 basic steps of the scientific method in order

Kruka [31]

Step 1: Ask a question or identify a problem. ...Step 2: Background research. ...Step 3: Form a hypothesis. ...Step 4: Experiment and observe. ...Step 5: Draw a conclusion.

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2 years ago

An atom contains one proton , one electron, and one neutron. Which two particles are most similar in mass

andrey2020 [161]

Proton and neutron, which are both approximately 1 amu

3 0

2 years ago

Read 2 more answers

Which of the following is the correct equation for photosynthesis

Finger [1]

Answer:

6CO2 + 6H20 + ENERGY = C6H12O6 + 6O2

Explanation:

Carbon dioxide + water + energy from light produces glucose and oxygen

4 0

2 years ago