HELP ME PLEASEEEEEEEEEEEEEEE
(I really dont know the subject i just know science)

1. Q=112.8 kJ

2. Q=5.01 kJ

The heat required for phase change :

Q = mLf

Lf=latent heat of fusion

Q = mLv

Lv=latent heat of vaporization

1.

m=50 g=0.05 kg

Lv (water) = 2256 kJ/kg

[tex]\tt Q=0.05\times 2256=112.8~kJ[/tex]

2.

m=15 g=0.015 kg

Lf for water = 334 kj/kg

[tex]\tt Q=0.015\times 334=5.01~kJ[/tex]

Answer:

particle size analysis, particle size measurement, or simply particle sizing is the collective name of the technical procedures, or laboratory techniques which determines the size range, and/or the average, or mean size of the particles in a powder or liquid sample.

Explanation:

Answer:

What role does the Automated Surface Observing Systems (ASOS) play in weather forecasting? It is a system of radar sensors used to track storms. It is the nation's primary weather-observing network. It provides weather reports much like the National Weather Service.

Explanation:

Answer:

the answer is c).It is the nation's primary weather-observing network.

Explanation:

Answer:

Don not sure if you got my last email I sent you a text but different question

Answer; molecule

Explanation:

Explanation:

P×V=n×R×T

L×atm / mol×K

n= PV /RT

Description:

So as we know that our Known variables: are P, V, R, T and our unknown variables are n. N= PV / RV. = 6.02 moles.

Answer: 6.02  moles

Hope this helps.

The moles of nitrogen gas present in 135 L at STP have been 6.02 moles.

The nitrogen gas has been assumed to be the ideal gas. For an ideal gas, at STP or standard pressure and temperature, the volume of 1mole of gas has been 22.4 L.

The STP conditions have been 273.15 K temperature, and 1 atm pressure.

Since, moles in 22.4 L gas been 1 mole. The moles in 135 L gas has been:

22.4 L = 1 mole

135 L = [tex]\rm \dfrac{1}{22.4}\;\times\;135\;moles[/tex]

135 L gas = 6.02 moles.

The moles of nitrogen gas present in 135 L at STP have been 6.02 moles.

For more information about the volume at STP, refer to the link:

https://brainly.com/question/11676583

Answer:

Heat

Explanation:

Heat will always flow from the warmer object to the colder object. The heat transfer will stop when the two objects are at the same temperature and reach thermal equilibrium.

Hope this helps!

Answer:

when both object are the same temperature

Explanation:

Answer:

4.9

Explanation:

Given data:

Mass of object = 67.4 ounce

Volume = 13.8 cup

Density = ?

Solution:

d = m/v

d = 67.4 ounce/13.8 cup

d = 4.9 oz/cup

Thus, density of object is  4.9 oz/cup.

Answer:

c

your answer is correct

Answer:

P₂ = 1000 atm

Explanation:

Given data:

Initial volume of air = 200 L

Initial pressure = 100 atm

Final volume = 20.0 L

Final pressure required = ?

Solution:

The given problem will be solved through the Boly's law,

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

100 atm × 200 L= P₂  × 20.0 L

P₂ = 20,000 atm. L/ 20.0 L

P₂ = 1000 atm

Explanation:

The nitrate anion is a univalent (-1 charge) polyatomic ion composed of a single nitrogen atom ionically bound to three oxygen atoms (Symbol: NO3) for a total formula weight of 62.05. Lead Nitrate is generally immediately available in most volumes.

Answer:

magnesium

Explanation:

it is the only metal in the choices. everything else is on the right side of the old line that separates metals and nonmetals on the PPT. nonmetals aren't, shiny or good conductors or malleable or ductile.  only metals can have those qualities. the only metal is magnesium

Answer:

sorry but i dont know it but you can ask me other things

Answer:

D

Explanation:

ahh i think,

AHH JUST LET ME SEND ITTT

Answer:

its one type of matter becomes another type of matter

Explanation:

it was that for a p e x

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question we have

[tex]volume = \frac{935}{7.8} \\ = 119.871794...[/tex]

We have the final answer as

Hope this helps you

before the water goes back in the enviorment

Answer:

3 Types of Water: Mineral, Spring and Prepared Water

Answer:

its minerals :)

Explanation:

i hope its right

alsooo heyyyy

Answer:

minerals!!!!! i think anyway

Explanation:

Answer:

Chlorine

Explanation:

Even though chlorine is highly electronegative, the best answer is no, and in this class we will consider chlorine not to form hydrogen bonds (even though it has the same electronegativity as oxygen). This is because chlorine is large and its lone electron is in a diffuse orbital, covering a large area, and thus do not have the high charge density to act as a strong hydrogen bond acceptor. But it does form weak hydrogen bonds in solid crystalline hydrogen chloride at very low temperatures.

Answer:

It would decrease

Explanation:

In an ecosystem, organisms feed on one another for survival due to the fact that energy needed for metabolic activities in individual organisms can only be obtained via food. This question depicts that certain bird population feeds on barley plant in an ecosystem.

However, If a disease attacks the plants in such a way that it destroys the barley plants in the field, this would cause the barley-eating bird population to DECREASE because their food source has been affected.

Answer:

the barley-eating bird population in the field would decrease.

Explanation:

Answer: 6.3 * 10^15

Explanation:

wavelength = speed of light / frequency

so rewriting the equation gives frequency = speed of light / wavelength

so 3.0 *10^10 / 4.76 * 10^-6  = 6.3 * 10^15

Answer:

2pounds

Explanation:

Given parameters:

Weight of Pedro's book  = [tex]\frac{19}{4}[/tex] pounds

Weight of Blanca's book  = [tex]\frac{17}{7}[/tex] pounds

Unknown:

How much more does Pedro's book weigh more than Bianca's book ?

Solution:

To Solve this problem, let us convert the fractions to decimal;

   Weight of Pedro's book  = 4.75 pounds

   Weight of Bianca's book  = 2.43 pounds

Differences  = 4.75pounds - 2.43 pounds

                     = 2.32 pounds

Estimating gives 2pounds

Answer:

The options a and b are correct

Explanation:

This options provided to the question are the answers to the question. But for clarification. When the fat melts, the change of state that occurs here is from solid to liquid (which is called melting) while the change of state that occurs when the water evaporated is from liquid to gas (which is called evaporation).

Answer:

D

Explanation:

The amount increased to a certain point then decreased

Answer:

it is D

Explanation:

Answer:

7.208 g

Explanation:

0.4mol x [tex]\frac{2(1.01) + 16.00 g}{1 mol}[/tex]

= 7.208 g

You are using molar mass of H20 to find the mass. Moles of 0.4 and 1 mol cancel out leaving you with just grams. You get the values in the numerator from the periodic table and the 2(1.01) is because you have 2 of the H in H20

Answer:

25 protons, 25 electrons, 30 neutrons. ......... manganese is the identity

Explanation;

x = atomic number -# of protons

The number of neutrons = x + 5

The mass number (sum of protons + neutrons) = 55.

x + (x + 5) = 55

2x + 5 = 55

2x = 50  

x = 25; atomic number 25 = manganese (Mn)

so ;

25 = Protons

30=Neutrons  

25=Electrons

A reaction comprises a reactant and a product. It is said to be in equilibrium when the rates for the forward and reverse reactions are equal. Thus, option D is correct.

An equilibrium reaction is a thermodynamic condition where the reactants and the products are at a stable position even before and after the reaction. They remain fixed and do not vary with the addition of any catalyst.

In the equilibrium position, the reaction rate of the forward (product formation) and reverse (reactant formation) remains the same and is seen in the reversible reactions only.

The amount of the products and the reactant remains constant till the temperature is constant but may vary if the tempearture is varied.

Therefore, the rate of reverse and forward are equal in the equilibrium reaction.

Learn more about equilibrium reaction here:

https://brainly.com/question/14926771

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