Please Help! My question is attached below.

Please Help! My Question Is Attached Below.

Answers

Answer 1

Answer:

C?

Explanation:


Related Questions

A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?
OV
Na
Mg
Se
Save and Frit

Answers

Answer:

Na

Explanation:

Sodium

The disinfectant hydrogen peroxide (H2O2)
decomposes to form water and oxygen gas.
How much O2 will result from the decomposition of 7.6 mol of hydrogen peroxide?
Answer in units of mol.

Answers

Answer: amount of O2 is 3.8 moles

Explanation: reaction. 2 H2O2 -> 2 H2O + O2

Two moles H2O2. Produces one ole Oxygen

How is evaporation related to molarity?

Answers

Answer:

Molarity is the amount (in mole) of solute in a solvent. If the solute is very volatile, then it will evaporated from the solution as temperature rising. So the amount of solute is decreasing, causing the molarity decreasing. If the solvent itself volatile, then the molarity will increase.

(Looked up the answer for you)

The relationship between evaporation and molarity is; the rate of evaporation of will decrease as the molarity increases

What is evaporation and molarity?

Molarity (M) is defined as the amount of a substance in a certain volume of solution. Molarity can also be defined as the number of moles of a solute per liters of a solution.

Now, the rate of evaporation of will decrease as the solute concentration increases due to the fact that for the same surface area for evaporation, as the concentration of the solute increases, less water molecules will get exposed to escape from the water surface.

Read more about Evaporation and Molarity at; https://brainly.com/question/14718840

Define Evaporation.
Thanks​

Answers

Answer:

evapouration is a type of vaporization that occur on the surface of liquid as it change into the gas phase.

hope it helps.

Evaporation happens when a liquid turns into a gas. It can be easily visualized when rain puddles “disappear” on a hot day or when wet clothes dry in the sun.

Use this equation to calculate the specific heat capacity of each metal:
cmetal =

c water = sp. heat capacity of water (4.18 J/gC)
m water = mass of the water in the cup
T water = change in water temperature
m metal = mass of the metal
T metal = change in metal temperature

What is the specific heat for the aluminum wire?
What is the specific heat for the steel wire?
What is the specific heat for the lead pellets?

Answers

Answer:

What is the specific heat for the aluminum wire?

0.82

What is the specific heat for the steel wire?

0.47

What is the specific heat for the lead pellets?

0.25

Explanation:

Answer:

What is the specific heat for the aluminum wire?

0.82

What is the specific heat for the steel wire?

0.47

What is the specific heat for the lead pellets?

0.25

Explanation:

This is the person above me. All credits go to them.

explain in 3 complete sentences

Answers

Answer:Air in high pressure systems moves in an anticlockwise direction (in the southern hemisphere), while air in low pressure systems moves in a clockwise direction due to the rotation of the Earth. At the surface of the Earth air flows from high pressure systems into low pressure systems.

Explanation:

Warm air rises, creating a low pressure zone; cool air sinks, creating a high pressure zone. Air that moves horizontally between high and low pressure zones makes wind.Smaller pressure systems create localized winds that affect the weather and climate of a local area.

If you can solve these thank you I will mark brainly.ASAP

Answers

Answer:Number 2 might be the second one

Explanation:

1. A substance with a definite mass but no definite volume or shape is a gas. Gas particles are spread far apart from one another, and they are constantly in motion such that they will fill up any container that they’re in. So the correct answer for 1 would be the first answer choice.

2. A liquid has a definite mass (all of the common states of matter have definite mass) and it has a definite volume: The particles of a given mass of liquid will occupy the same amount of space regardless of the shape of the liquid’s container; it likewise follows that a liquid does not have a definite shape. So, while one liter of water can fill and take the “shape” of a bowl or a bottle, there will always be one liter of water in each. So, the correct answer here would be the fourth answer choice.

3. A solid has a definite mass, a definite shape, and a definite volume precisely because its particles are not free to zip around freely (or rapidly). So the fourth statement is not true, and thus the fourth answer choice would be the correct answer here.

Now balance the chemical reaction by providing the correct coefficients:

carbon + fluorine gas yields
carbon tetrafluoride

[?] C+[?]F2 → [?]CF4

Answers

1C + 2F2 -> 1CF4 is the answer
So the coefficients are 1,21

Question of the day

Seeds obtain their energy (food) directly from the soil as soon as they are planted.


True or False?

Answers

Answer:

false

Explanation:

it gets nourishment from the storage tissues in the seeds, when it develops into a young plant with roots, then it takes nutrients from the soil

False

When a seed is planted, it gets nourishment from the storage tissues in the seeds. The storage tissues could be in the cotyledon, peristem or endosperm. The storage tissue contain carbohydrates proteins,and fats content. When the embryo develops into a young plant with young roots, the plant then draws nutrients from the soil.

A gas system has an initial number of moles of 0.693 moles with the volume unknown. When the number of moles changes to 0.928 moles volume is found to be 7.98 L. What was the initial volume in mL?

Answers

Answer:

The initial volume in mL is 5959.2 mL

Explanation:

As the number of moles of a gas increases, the volume also increases.  Hence, number of moles and volumes are directly proportional i.e

n ∝ V

Where n is the number of moles and V is the volume

Then, n = cV

c is the proportionality constant

∴n/V = c

Hence n₁/V₁ = n₂/V₂

Where n₁ is the initial number of moles

V₁ is the initial volume

n₂ is the final number of moles

and V₂ is the final volume.

From the question,

n₁ = 0.693 moles

V₁ = ?

n₂ = 0.928 moles

V₂ = 7.98 L

Putting the values into the equation

n₁/V₁ = n₂/V₂

0.693 / V₁ = 0.928 / 7.98

Cross multiply

∴ 0.928V₁ = 0.693 × 7.98  

0.928V₁ = 5.53014

V₁ = 5.53014/0.928

V₁ = 5.9592 L

To convert to mL, multiply by 1000

∴ V₁ = 5.9592 × 1000 mL

V₁ = 5959.2 mL

Hence, the initial volume in mL is 5959.2 mL

How many moles of oxygen are required to react with 12 moles of FeS2?

4FeS2 + 11O2 → 2Fe2O3 + 8SO2

Answers

19 moles of O2 probably

gas
LA of certain mass occupies a volume of 650 cm3 under
a pressure of 760mmHg. Calculate the pressure under which
the volume of the
gas
cent
of its original volume
will be reduced by 10 per​

Answers

Answer:

844.4cm³

Explanation:

Using Boyle's law equation;

P1V1 = P2V2

Where;

P1 = initial pressure (mmHg)

P2 = final pressure (mmHg)

V1 = initial volume (cm³)

V2 = final volume (cm³)

According to the information in this question,

V1 = 650cm³

P1 = 760mmHg

P2 = ?

V2 = 10% reduction of V1

10% of 650 = 10/100 × 650

65

V2 = 650 - 65 = 585cm³

Using P1V1 = P2V2

P2 = P1V1 ÷ V2

P2 = (760 × 650) ÷ 585

P2 = 494000 ÷ 585

P2 = 844.44

final pressure (P2) = 844.4cm³

A photon of visible light can be emitted when
Select one:
O a. an excited electron jumps down to ground state
O b. a ground state electron absorbs energy
O c. a ground state electron jumps to a higher energy level

Answers

Answer:

a ground state electron jumps to a higher energy level


5 Which two elements are combined in magnesium oxide?

Answers

Answer:

magnesium and oxygen

Explanation:

Texas hill country is largely composed of soft limestone rock. When exposed to carbonic acid in rainwater, limestone can deteriorate and weaken. What affect does this process have on the landforms of Texas hill country?

Answers

Answer:

The answer is "It leads to the formation of underground caves"

Explanation:

Texas Hill Land is popular for its rolling hills, good wine, and authentic food. Its Texas Hill Property appeal is no mystery, recognized as being one of the top vacation destinations in the World. Texas Hill Structure is primarily mostly of weak calcareous stone. Calcium may worsen or degrade if exposed to carbon dioxide in rainwater. This practice affects the land of the Texas smoky Mountains leading to the formation of underwater groves.

The temperature of 335 g of water changed from 24.5oC to 26.4oC. How much heat did this sample absorb? C for water = 4.18 J/goC

Answers

Answer: The sample absorbed 3061.565J

Explanation:

Given that  

Mass of water  = 335g

Initial temperature  = 24.5°C

Final temperature = 26.4°C

Heat  absorbed by the sample is given as  = mass x specific heat of water x  temperature change

Heat  absorbed,q=mCΔt

The specific heat of water,C  = 4.81J/g°C

 

Therefore,  Heat absorbed,q  = 335 x 4.81h x (26.4  - 24.5)  = 3061.565J

Answer:

2660.57 J

Explanation:

26.4 - 24.5 = 1.9

335 x 4.18 x 1.9 = 2660.57 J

That is the correct answer.

Describe the kinds of potential energy that are stored by a car driving on a hill.

Answers

Answer:

The internal combustion engine in the car converts the potential chemical energy in gasoline and oxygen into thermal energy which is transformed into the mechanical energy that accelerates the vehicle (increasing its kinetic energy) by causing the pressure and performing the work on the pistons.

Explanation:

Identify Acid, Base, Conjugate acid, and base pairs in the following: HPO2 + NH" -> H-PO, + NH, Conjugate Acid ,HPO 2 Acid NH, ΝΗ, Base H PO Conjugate Base​ I need answers now

Answers

Answer:

no ablo inglés porfavor amigos

The following diagram on the left represents the copper nitrate solution in the half‑cell before the galvanic cell starts to operate. In the following diagram on the right, draw a representation of the solution in the same half‑cell after the galvanic cell has been operating for some time and is still producing a voltage.

Before reaction : 4 Cu2+ molecules and 8NO3-

Answers

Answer:

There is too much here for me to attempt in one sitting, but I will get you started and give suggestions that may help you proceed on your own.

a)  As far as I can tell, you didn't provide the reduction potentials in the table below.  So, I looked them up and find them to be

Cu2+ +2e- ==> Cu(s)  Eº = +0.34 V

Zn2+ + 2e- ==> Zn(s)  Eº = -0.76 V

Net ionic equation:  Cu2+(aq) + Zn(s) ==> Cu(s) + Zn2+(aq)

b)  Eºcell = 0.34 V + 0.76 V = 1.10 V

c)  ∆Gº = -nFEº  where n = number of electrons transferred (2) and F = 96,485 C/mol e- and Eº = 1.1 V

d)  Again, there is no diagram

e)  same

f)  Use the Nernst equation  Ecell = Eºcell - 2.303RT/nF log Q  where R = 8.314; T = Kelvin; F = Faraday const. and Q = reaction quotient, i.e. products/reactants

g)  the cell voltage is an intensive property.  That should help you answer this part of the question

Explanation:

its not much but i hoped this helped

where is the magnitude of force of magnetism the greatest​

Answers

Answer:

The strength of the field varies depending on its location around the magnet. The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole.

Explanation:

For a reaction which change can increase the rates of reaction?

Answers

Answer:

temperature!!!

Explanation:

Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.

Does anyone know the simplest way to find the rate constant in rate law chemistry?

Answers

Answer:no I don’t sorry

Explanation:

When a mixture of iron powder and sulphur is heated it glows more brightly than that of iron filings and sulphur.Explain this observation

Answers

Answer:

I don't know

Explanation:

mixture of iron powder and sulphur heated it glows because sulphur and iron are more reactive metals that they shine and sulphur can react with water produce fire it's write

A helium balloon with a volume of 5.0 L and a pressure of 105 kPa at 25°C floats up high in the sky where the pressure is 850 mm Hg and the temperature is -15°C. What is the new volume of the balloon?

Answers

Answer:

volume 2-     4.011 L

what is the only thing that stops gamma rays?

Answers

The Answer is LEAD ......................

find the empirical formula for
42.05g of nitrogen, 95.95 of oxygen

and
7.33g of lanthanum, 2.96g of oxygen

Answers

Answer:

[tex]NO_2[/tex] and [tex]La_2O_7[/tex]

Explanation:

Nitrogen:

[tex]\frac{42.05}{14}=3[/tex]

Oxygen:

[tex]\frac{95.95}{16}=6[/tex]

Ratio:

[tex]3:6=1:2[/tex]

So empirical formula becomes [tex]NO_2[/tex]

-----

Lanthanum:

[tex]\frac{7.33}{139}=0.0527[/tex]

Oxygen:

[tex]\frac{2.96}{16}=0.185[/tex]

Ratio:

[tex]0.0527:0.185=1:3.5=2:7[/tex]

So empirical formula becomes [tex]La_2O_7[/tex]

Un convertidor catalítico acelera la reacción del monóxido de carbono con oxígeno para producir dióxido de carbono. ¿De qué manera cada uno de los siguientes cambios afectaría la velocidad de reacción que se muestra aquí? Sustente 2CO (g) + O2(g) → 2CO2(g) a). Quitar el catalizador. B). Eliminar parte de O2(g)

Answers

Answer:

a. Disminuye.

b. Disminuye.

Explanation:

¡Hola!

En este caso, considerando que tenemos una reacción en la cual se podría asumir que tanto la concentración de monóxido de carbono y la de oxígeno contribuye a la velocidad de reacción, de acuerdo a la siguiente cinética elemental:

[tex]r=k[CO]^2[O_2][/tex]

Al aplicar los siguientes cambios, resultaría:

a. En este caso, bien sabemos que la velocidad de reacción es aumentada al adicionar un catalizador ya que la constante de velocidad aumenta al disminuir la energía de activación; no obstante, al retirar el catalizador, la energía de activación aumentaría y por consiguiente la velocidad de reacción disminuiría.

b. En este caso, dado que la relación entre el oxígeno y la rapidez de reacción es directamente proporcional, es possible para nosotros determinar que al eliminar parte del oxígeno, la concentración disminuye y por ende la velocidad de reacción también.

¡Saludos!

Carlotta notices that the words of a book are blurry, but a sign across the road is not. What might correct Carlotta’s vision?


a diverging lens, to fix her farsightedness

a diverging lens, to fix her nearsightedness

a converging lens, to fix her farsightedness

a converging lens, to fix her nearsightedness


hurry plz

Answers

Answer:

C.

Explanation:

An atom starts with 20 electrons and 20 protons; after a reaction, it has 18 electrons and 20 protons.

Answers

Answer:

(+20) + (-18) = +2

Explanation:

The probability?????????????????

Answers

Answer: 4/20

Explanation:
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