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3 years ago

Some people believe that the Moon’s phases are caused by Earth’s shadows on the Moon. Is this true? Use your model to explain.

Chemistry

1 answer:

Kisachek [45]3 years ago

5 0

Answer: False

Some people believe that the Moon’s phases are caused by Earth’s shadows on the Moon is false.

Explanation:

Some people believe that the Moon’s phases are caused by Earth’s shadows on the Moon is their misconception. 

The phases depend on its place relative with sun and earth.The phases of moon are new moon,waxing crescent, first quarter, waxing gibbon, full moon, wanning gibbon,last quarter, wanning crescent,new moon.

For example, 

When moon, earth, and sun are exactly in the same line and moon lies in between earth and sun, the sun illuminates the back part of the moon which is not visible from earth. This forms new moon.

So only relative positions matter in the phases of moon. 

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Cerrena [4.2K]

Answer:

Erosion

Explanation:

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3 years ago

If an atom has 34 electrons, 46 neutrons, and 34 protons, what is its mass number? what is the name of the element?

OleMash [197]

Mass number = protons + neutrons = 34+46 =80

the element with an atomic number of 34 and mass number of 80 is selenium

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3 years ago

How to calculate delta S surroundings? calculate Delta S(surr) at the indicated temperature for a reaction having each of the fo

astraxan [27]

You can use the equation ΔS(surr)=q(surr)/T or ΔS(surr)=-q(rxn)/T.
the two equations are equal since we know that the energy the system (reactoin) puts out just goes into the surroundings.
(In other words q(surr)=-q(rxn))

Using the equation, ΔS(surr)=-(-283kJ/298K)=0.9497kJ/K or 949.7J/K

This answer makes sense since the reaction is exothermic which means it released energy into the system which usually causes the entropy to increase.

I hope that helps.

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4 years ago

A molecule of butane and a molecule of 2-butene both have the same total number of

Vinvika [58]

The correct answer is option 1. Butane and 2-butene have the same total number of carbon atoms. They both have four carbon atoms. They differ in there structure since the latter has double bonds on it. As a result of the different structure, they also have different properties.

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3 years ago

How many parts per million of lead is found in 250 ml of water if there is 1.30g of lead in the water? 1ml=1g

SSSSS [86.1K]

Answer:

5200 ppm

Explanation:

As per the definition, parts per million of a contaminant is a measure of the amount of mass of contaminant present per million amount of the solution. It is denoted by ppm.

Given in the question,

Water = 250 ml = 250 g

Lead = 1.30 g

So,

ppm of Lead = $\frac{Lead}{Water} \times 10^6$ = $\frac{1.30}{250} \times 10^6$ = 5200 ppm

So, as calculated above, there is 5200 ppm of lead present in 250 ml of water.

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3 years ago