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Scilla [17]
3 years ago
15

Which of the following popular sayings is an example of a true scientific theory?

Chemistry
2 answers:
algol133 years ago
8 0

Answer:

1st or 2nd options

Explanation:

Yes, carrots will help improve eyesight. The body uses beta-carotene to make vitamin A, and “vitamin A is really important, there's no question about that,” says Emily Chew, deputy clinical director at the National Eye Institute.

Warm milk because milk has small amounts of tryptophan, the raw material the brain uses to build both serotonin and melatonin. These are compounds that help us relax and prepare for sleep.

Hope this helps :D

Iteru [2.4K]3 years ago
4 0

I think the correct answer is the first option. Among the popular sayings given, the true scientific theory is the statement "Eating <span>lots of carrots will improve your eyesight.<span>" This is because many studies and researches had been done and proved that carrots really helps improve or maintain the health of the eyes.</span></span>

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Why are most solid ionic compounds electrically nonconductive, whereas aqueous solutions of ionic compounds are good conductors
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there must be free-moving electrons in a compound to conduct electricity.

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4HCl(g)+O2(g)⟶2Cl2(g)+2H2O(g) Calculate the number of grams of Cl2 formed when 0.385 mol HCl reacts with an excess of O2. mass:
FromTheMoon [43]

The number of grams of Cl2 formed when 0.385 mol HCl reacts with an excess of O2 is 13.6675 g.

<h3>What are moles?</h3>

A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Given data:

Moles of hydrochloric acid = 0.385 mol

Mass of chlorine gas =?

Chemical equation:

4HCl +  O₂ → 2Cl₂  + 2H₂O

Now we will compare the moles of Cl₂ with HCl.

                 HCl           :               Cl₂

                   4             :               2

                0.385       :              2÷4× 0.385 = 0.1925 mol

Oxygen is present in excess that's why the mass of chlorine produced depends upon the available amount of HCl.

Mass of Cl₂ :

Mass of Cl₂ = moles × molar mass

Mass of Cl₂ =0.1925 mol × 71 g/mol

Mass of Cl₂ =  13.6675 g

Hence, the number of grams of Cl2 formed when 0.385 mol HCl reacts with an excess of O2 is 13.6675 g.

Learn more about moles here:

brainly.com/question/8455949

#SPJ1

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