Which is a warning sign that someone needs the help of a mental health professional?

1 answer:

8 0

If they talk to themselves,laugh when nobody is around and they do not have the TV on or are laughing when they do not have their smartphone nearby.Also crying a lot for no reason.If they say that they hear voices when nobody is around.If they do things that do not make any sense.Maybe they need to talk to someone such as a friend as they could be going through a tough time. If someone did have a talk with the person and things did not get any better, maybe professional help is needed.

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g If 50.0 mL of a 0.75 M acetic acid solution is titrated with 1.0 M sodium hydroxide, what is the pH after 10.0 mL of NaOH have

V125BC [204]

Answer:

pH = 2.66

Explanation:

Acetic Acid + NaOH → Sodium Acetate + H₂O

First we calculate the number of moles of each reactant, using the given volumes and concentrations:

0.75 M Acetic acid * 50.0 mL = 37.5 mmol acetic acid

1.0 M NaOH * 10.0 mL = 10 mmol NaOH

We calculate how many acetic acid moles remain after the reaction:

37.5 mmol - 10 mmol = 27.5 mmol acetic acid

We now calculate the molar concentration of acetic acid after the reaction:

27.5 mmol / (50.0 mL + 10.0 mL) = 0.458 M

Then we calculate [H⁺], using the following formula for weak acid solutions:

[H⁺] = $\sqrt{C*Ka}=\sqrt{0.458M*1.76x10^{-5}}$

[H⁺] = 0.0028

Finally we calculate the pH:

pH = -log[H⁺]

pH = 2.66

8 0

2 years ago

What do astronomers use to calculate the age of the universe? Select three options.

sasho [114]

The answers are

The age of the oldest stars

How fast distant galaxies are moving away from us

Patterns of background radiation.

Explanation:

The Astronomers calculate the age of the universe by looking for oldest stars, and by measuring the rate of expansion of the universe and back to big bang.

The Astronomers used the techniques like the age of oldest stars, how fast the distant galaxies are moving away from us, patterns of background radiation and along with the Big Bang as reference point, they estimate that the universe may be approximately 12 billion years old.

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2 years ago

Calculate the mass in grams of each sample. 4.88x10^20 H2O2 molecules

AleksAgata [21]

4.88x10^20 H2O2 molecules

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2 years ago

Which element has the highest 2nd ionization energy? A. Be B. C C. Li D. B

dlinn [17]

Answer:

The answer is c.........

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