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3 years ago

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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Is C3HNO an organic molecule

antoniya [11.8K]

Answer:

Yes.

Explanation:

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3 years ago

The valences of metal x,y and z are 1,2 and 3 respectively. What are the formulae of their;a) hydroxides, b) sulphates, c) hydro

Rina8888 [55]

Answer:

See answer below

Explanation:

AS we know that the valence for those metals X, Y, and Z are 1, 2 and 3, we can determine the formula of each compound.

1. Hydroxides.

An hydroxide is formed when an oxyde of a metal reacts with water. When this happens, the general molecular formula is:

Meₐ(OH)ₙ

Where:

a: valence or charge of the hydroxide (Which is -1)

n: valence of the metal.

Following this, the formula for X, Y and Z would be:

XOH

Y(OH)₂

Z(OH)₃

2. Sulphates

Sulphates follow a similar rule of hydroxide in the general molecular formula, but instead of having a charge of -1, it has a charge of -2 so:

Mₐ(SO₄)ₙ

So, following the rule:

X₂SO₄

Y₂(SO₄)₂ ------> YSO₄

Z₂(SO₄)₃

3. Hydrogens

Following the same rule as the previous, hydrogens works with a charge of -1, so:

MₐHₙ

Then:

YH₂

ZH₃

4. Carbonates.

This follows the same rule as sulphates, with the same charge so:

Mₐ(CO₃)ₙ

Then:

X₂CO₃

YCO₃

Z₂(CO₃)₃

5. Nitrates

Follow the same rule as the hydroxides, with the same charge of -1.

Mₐ(NO₃)ₙ

Then:

XNO₃

Y(NO₃)₂

Z(NO₃)₂

6. Phosphates

In the case of phosphates, these have a charge of -3 so:

Mₐ(PO₄)ₙ

Then:

X₃PO₄

Y₃(PO₄)₂

Z₃(PO₄)₃ ----> ZPO₄

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3 years ago

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