Can someone please help me? :(

Answer:

In the article it says “

new research by British and American scientistssuggest a chemical not controlled by the international treaty poses apotential risk to the Earth's protective ozone layer.

“ which means America

and Britain retested a certain hypothesis by The Montreal Protoco

Explanation:

Explanation:

Hola Mi nombre es que eres Rodríguez López

The temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.

The solubility of a substance is its ability to be dissolved in water.

The solubility of 37 g of Copper (II) sulfate is determined from the solubility curve of Copper (II) sulfate.

The solubility of 37 g of potassium chloride is determined from the solubility of potassium chloride.

Thus, from the solubility charts, the temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.

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Answer:

phosphorous

Explanation:

A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements. Although elements such as gold, silver, tin, copper, lead and mercury have been known since antiquity, the first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.

Answer:

New volume of gas is still 4.0 litres

Explanation:

Gases have no definite shape or volume. They therefore take the shape of their containers. Hence, volume of gas in a container is determined by the volume of the container. Though some gas was lost after the opening of one of the valves, volume of gas still remains the same.

A gas is contained in a tick-walled balloon. When the pressure changes from 2. 95atm to 2.57 atm. p.

Pressure is a force perpendicular to the unit area on which it is applied.

Given that, P1, the initial pressure is 2.95 atm

The initial volume, V1 = 7.456 L

The final volume, V2 = 4.782 L

The initial temperature, T1 =  379k

The final temperature, T2 = 212k

The equation will be

[tex]\dfrac{P_1V_1}{T_1 } =\dfrac{P_2V_2}{T_2}[/tex]

Putting the values in the equation

[tex]\dfrac{2.95 \times 7.456 L }{379k } =\dfrac{P_2\times 4.782 L}{212k}\\\\\\P_2 = \dfrac{2.95 \times 7.456 L \times 212k }{379k \times 4.782 L} = 2.57\;atm.[/tex]

Thus, the pressure changes from 2. 95atm to 2.57 atm p.

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Answer:

0.202M

Explanation:

you will want to use C₁V₁=C₂V₂ to solve for this.

C₁ is the initial concentration, in this problem it is .458 mol/L or M

V₁ is the initial volume, so it will be the 22.0 mL or 0.0220L

C₂ is the new concentration but here it is unknown.

V₂ is the new volume which is 50.0 mL or 0.0500L.

1. So now we plug this information in to the equation:

[tex](.458 mol/l)(0.0220L)=(C_{2} )(0.0500L)[/tex]

2. We then do algebra to get C₂ alone:

[tex]C_{2} =\frac{(.458 mol/L)(0.0220L)}{(0.0500L)} =0.20152 mol/L or M[/tex]

The liters cancel out and take note of the significant figures, there are 3 digits in all numbers in the question, so that means your answer must contain 3 sig figs. The answer 0.0202 rounded.

** instead of converting the mL to L you can also just keep them mL since they will be crossed out anyway. You will still get the correct answer.

Hope this help you! good luck :)

Answer:

# 5

Explanation:

The question describes silver being "poured" into a mold and cools to become a solid bar. This is the phase of liquid to solid. When a element cools down below it's freezing points to become a solid.

Liquid to Solid Definition:

Freezing, or solidification, is a phase transition in which a liquid turns into a solid when its temperature is lowered to or below its freezing point. All known liquids, except helium, freeze when the temperature is low enough.

Answer:

A, and b, hope this is right

Explanation:

Answer:

Many things could of prevented the Chernobyl tragedy. Such as better staff training. If the Soviet government had learned from the lessons of the past and if they had not been so averse to spending money.

Explanation:

Have A Great Day

Hope This Helps

~Zero~

(a) The number of moles of gas for first case is 0.065 mol.

(b) The number of moles of gas for second case is 0.03 mol.

(c) The number of moles of gas for third case is 0.038 mol.

The number of moles of the gas is determined by applying ideal gas equation as follows;

PV  = nRT

n = PV/RT

where;

n = (1.06 x 1.25) / (0.082057 x 250)

n = 0.065 mol.

n = (0.8 x 0.925) / (300 x 0.082057)

n = 0.03 mol

n = (0.75 x 0.921)/(223 x 0.082057)

n = 0.038 mol

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The work done by the gas against an external pressure during the isotherma expansion is -12 J.

The work done by the gas against an external pressure during the isotherma expansion is calculated as follows;

W(net) = ΔP x ΔV

where;

W(net) = (6 kPa - 8kPa) x (8L - 2L)

W(net) = - 12 kPa.L

W(net) = -12 J

Thus, the work done by the gas against an external pressure during the isotherma expansion is -12 J.

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Answer:

producer of t4he food chain is the grass,the producer gets is enrgy7 by the sun and i dont4 know number 2 that4s all i know sorry

Explanation:

Compared to rodents, rabbits have an extra pair of incisors and other skeletal structures that are different, scientist can conclude from this observation that they are serially homologous.

Serial homologous organs or structures are those that are structurally similar but have been modified to perform distinct functions.

As rodents and rabbits both have some similar functions and some changes in the skeletal structure, so that they both are serially homologous.

Hence scientist conclude that rodents and rabbits are serially homologous animals.

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Answer:

better sanitation systems

Answer:

Cooperation

Explanation:

Those animals are understanding the needs of each other.

Answer:

makwe me brainliest pls hope it helps;)

Explanation:

Neutrons are electrically neutral, but contribute to the mass of a nucleus to nearly the same extent as the protons. Neutrons can explain the phenomenon of isotopes (same atomic number with different atomic mass). The main role of neutrons is to reduce electrostatic repulsion inside the nucleus

Answer:

The answer is Gain of electrons

Explanation:

Oxidation is the process of losing an electrons, while reduction is the process of gaining them.

Answer:

Gain of electrons

Answer:

1

Recall that at STP, 1 mole of any ideal gas occupies 22.4 liters. Volume O2 gas = 0.0510 moles O2 x 22.4 L/mole = 1.14 liters (3 sig.

Explanation:

hope this helps

Answer:

naclo4+koh naoh+kclo4

Explanation:

if you know your cemestry

Answer:

it's A

Explanation:

Answer:

Exothermic

Explanation:

Exothermic describes a process or reaction that releases energy

Answer:

Medical Scientists  and  Biochemists and Biophysicists

Hope This Helps!!

Answer:

its Medical Scientists  and  Biochemists and Biophysicists

Explanation:

i got it right

Answer:

Third choice    see below

Explanation:

Weight change of potato chip   .45 - .42  = .03 gm

Assume all of the heat from burning the chip goes into the water (and none goes into the air or heating the can)

 24 degrees - 21 degrees = 3 degrees C  temp change

     spec heat water = 1    cal / g -cal  

  50 gm * 3 degrees * spec heat water = 150 calories  

150 calories = 150/1000 Calories  

Now for the potato chip

  150/1000 Calories   /   .03 gm =    5 Cal/gm

Answer:

Caffeine, lead, Copper(ii) chloride, Sodium chloride, silver and tungsten

-361 kJ/mol heat would be released if 2 moles of nitrogen and 2 moles of oxygen form 4 moles of NO (g) at 101.3 kPa and 298 K.

Enthalpy of formation is defined as the heat change that is needed for formation of one mole of a substance from its constituent elements in pure state.

In the present case, Heat of formation of 4 moles of NO (g) at 101.3 kpa and 298 k is -90.25 kJ/mol. The Negative sign indicates that, heat is evolved from the system.

Thus, for 4 moles of NO, the heat of formation will be 4 X (-90.25 kJ/mol) = -361 kJ/mol.

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Answer:

D

explaination:

the "prop" stands for three carbons , and this is an alkane so that means it only has single bonds between carbon and hydrogen , hence the name propane

Answer:

the troposphere because we are living in atmosphere when the atmosphere next troposphere the sudden flashes of light and discharge resulting atmosphere condition sound waves of trambeling

thank you

No elements visible!

Ions form between metals and non-metals.

Hope this helps!