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3 years ago

How is a universal pH indicator made

1 answer:

3 0

Hey!! your answer is -----

universal pH indicator is made up by the combination of several types of indicator.

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Which of the following is equal to 2.0 liters? 200 mL 2,000 cm3 20 m3 20,000 mm3

ololo11 [35]

It equals 2000 but in this case it would be 20,000mm3

4 0

4 years ago

How many valence electrons does K+ have

Lera25 [3.4K]

Answer:

About one valence electron

Explanation:

Obviously, removing that electron gives us [Ar] (same configuration as K1+), which is a noble gas and has 8 electrons. Valence electrons are generally regarded as being 'the outermost electrons' for a given atom. Therefore, with neutral potassium, there is one valence electron

5 0

3 years ago

Read 2 more answers

You have 16.0 g of some compound and you perform an experiment to remove all of the oxygen, 11.2 g of iron is left. What is the

Makovka662 [10]

The empirical formula of this compound is $Fe_2O_3$

<h3>Empirical formula </h3>

To calculate the empirical formula of a compound, the value of moles of each element is needed.

As we have the information of the mass value, we will use the molar mass expression, which corresponds to:

$MM_O = 16g/mol\\MM_Fe = 55.8g/mol$

$MM = \frac{m}{mol}$

$16 = \frac{4.8}{x}$

$x = 0.3mol$

$55.8=\frac{11.2}{x}\\x = 0.2$

As the value of the empirical formula must be an integer, simply multiply the two values by a common factor:

$O = 0.3 \times 10 = 3\\Fe = 0.2 \times 10 = 2$

$Fe_2O_3$

So, the empirical formula of this compound is $Fe_2O_3$ .

Learn more about empirical formula: brainly.com/question/1247523

3 0

2 years ago

Identify this reaction <br><br> HBr+ Al(OH)3 —-> H2O + AlBr3

Vikki [24]

<h2><em><u>Answer</u></em></h2>

Neutralization reaction

5 0

3 years ago

How come flowers usually contain more stamen the pistils

USPshnik [31]

<span>To make sure there are enough pollen to fertilize the seeds from the pistil. Not all pollen can make it to the pistil. It's the same as animals producing millions of sperms although only one is needed for fertilization.</span>

5 0

3 years ago