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3 years ago

Please give me a clear message on what to do. how do you change your brainly username?

Chemistry

2 answers:

emmainna [20.7K]3 years ago

5 0

Answer:

you can't change it mate I am so sorry

BTW can you help me in my latest questions it's not related to studies it's a problem I am having with my laptop that need to get cured as I have exam tomorrow

iren2701 [21]3 years ago

5 0

Answer:

Follow these steps to make a change:

1) Log in to your account.

2) Go into Profile Settings, select Edit Profile.

3) Go to Your Preferences and edit the First Name section.

4) Select Change to save.

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A wave traveling through air meets an object and bounced off its flat surface

maks197457 [2]

It is a I’m think I’m pretty sure

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3 years ago

Read 2 more answers

Find the H+ concentration of of a solution that has a pH solution of 12.24

PolarNik [594]

Answer:

[H⁺] = 5.754 x 10^-13 M

Explanation:

Since pH is the negative log of the hydronium concentration, we can solve for hydronium concentration and then plug in our given pH:

pH = -log[H⁺]

-pH = log[H⁺]

10^-pH = [H⁺]

Let's plug in our pH:

[H⁺] = 10^-pH = 10^-12.24 = 5.754 x 10^-13 M

3 0

3 years ago

A 230 g sample of a compound contains 136.6 g of carbon, 26.4 g of hydrogen, and 31.8 g of nitrogen. The rest is oxygen. What is

photoshop1234 [79]

If the total amount of the sample is 230g and they give each component of the sample, we add the given amount of grams of each element and subtract the given from 230g.

$136.6+26.4+31.8 = 194.8$
$230-194.8=35.2$

That means the rest of oxygen is 35.2g

This is Percent Composition.

The formula to find the percent composition of an element inside a compound is $\frac {MolarMass Of Element}{MolarMass Of Compound}*100$

Now we implement the variables into the formula to find the percent composition oxygen.

$\frac {35.2}{230} *100 =15.30$

The answer is 15.30% = O

7 0

3 years ago

To gravimetrically analyze the silver content of a piece of jewelry made from an alloy of Ag and Cu, a student dissolves a small

Ipatiy [6.2K]

Answer:

Adding a solution containing an anion that forms an insoluble salt with only one of the metal ions.

Explanation:

The student have in solution Ag⁺ and Cu²⁺ ions but he just want to analyze the silver, that means he need to separate ions.

Centrifuging the solution to isolate the heavier ions FALSE Centrifugation allows the separation of a suspension but Ag⁺ and Cu²⁺ are both soluble in water.

Adding enough base solution to bring the pH up to 7.0 FALSE At pH = 7,0 these ions are soluble in water and its separation will not be possible.

Adding a solution containing an anion that forms an insoluble salt with only one of the metal ions TRUE For example, the addition of Cl⁻ will precipitate the Ag⁺ as AgCl(s) allowing its separation.

Evaporating the solution to recover the dissolved nitrates. FALSE . Thus, you will obtain the nitrates of these ions but will be mixed doing impossible its separation.

I hope it helps!

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3 years ago

A solution of pH 3 was mixed with a solution of pH 9. What is the final pH could be ?

chubhunter [2.5K]

The solution of which contains of PH 3 called acidic medium which is more stronger acid called HCl when reacts to the stronger base base NaOH forms the acid base reaction .

According to acid base equation you consider ph5 as PH 9 if you understand it then tell me below

3 0

3 years ago