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4 years ago

Which phrase change is an endothermic change? (1 point)

1 answer:

5 0

An Endothermic change is a process in which there is absorption of energy.
-Condensation is the transformation from a gas to a liquid. So the water molecules releases energy while condensing, so condensation is exothermic (opposite of endothermic, it's the release of energy)
-Vaporization is the transformation from a liquid to a gas. When you heat water to evaporate it, you're giving energy to the water molecules. And when they absorb this energy, they transform to a gas. Which means that Vaporization is endothermic.
-Deposition is the transformation from gas directly to solid without passing by the liquid phase. Same as the condensation, but the water molecules release even more energy to directly become Solid. So deposition is exothermic.
-Freezing is the transformation from a liquid to a solid. During this phase, water molecules releases energy to its surrounding. So freezing is exothermic.

We can conclude that Vaporization is endothermic, because it's absorbing energy to transform from liquid to gas, while condensation, deposition and freezing are exothermic because they release energy to transform.

Hope this Helps! :)

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Pls, Help!!!!!!!

yKpoI14uk [10]

Answer:

Element A = Oxygen

Element H =

Element B = Aluminum

Element J = Magnesium

Element C = Selenium

Element L = Carbon

Element D = Sodium

Element Q = Francium

Element F = Antimony

Element R = Calcium

Element G = Chlorine

Element S = Tellurium

Explanation:

Element A is Oxygen because: oxygen 6 valence electrons ; is a gas at room temperature ; and is transported in blood to cells.

Element H is Neon because: Neon is a noble gas ; qppears as red light when charged with electricity (Neon light signs) and it has the second highest Ionization energy of the elements

Element B is Aluminum because: Aluminum is a metal and its ion has charge of +3. It is also located on the borders of the Metalloid staircase .

Element J is Magnesium because its ion has charge of 2+ and is isoelectronic with Neon because it loses two electrons to now have 10 electrons.

Element C is Selenium because its ion that has a charge of -2 is formed by gaining two electrons in order to have 36 electrons which is isoelectronic with Kr ypton

Element L is Carbon because carbon has the smallest atomic radius of any member in the Carbon family because it is the first member of the family and atomic radius increases on going down the group.

Element D is Sodium because its ion has charge of +1 and it has 2 inner core levels , the 1 and 2 energy levels.

Element Q is Francium because it has the largest radius and lowest ionization energy of any element

Element F is Antimony. It is a member of Nitrogen family and has the second highest ionization energy level in family .

Element R is calcium because its on has charge of +2 which is isoelectronic with Argon . Calcium also has atomic radius is larger than Ar gon.

Element G is Chlorine. It has the second to the smallest radius of elements in the 3rd period as the second to the last element in the period because atomic radius decreases across a period from left to right.

Element S is Tellurium. It has atomic mass larger than Iodine just to the right of it and is found in the 5th period

4 0

3 years ago

Convert 4.5 X 1022 molecules of H2O to moles.

noname [10]

Answer:

<h3>The answer is 0.075 moles</h3>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{4.5 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.074750830...$

We have the final answer as

<h3>0.075 moles</h3>

Hope this helps you

3 0

3 years ago

Mass in mg<br> salt<br> sugar<br> chalk<br> sand<br> water

STALIN [3.7K]

Its 470mg k dude or dudette

6 0

4 years ago

What are the formulas for the ionic compounds named sodium iodide and magnesium iodide

bixtya [17]

Sodium Iodide: NaI

Magnesium Iodide: MgI2

8 0

3 years ago

Please help. Im not a very smart person

GenaCL600 [577]

Either it’s, it is released when the reaction is complete or it is changed into atoms of carbon and oxygen during the reaction

7 0

3 years ago