i need help can someone help me

I Need Help Can Someone Help Me

Answers

Answer 1

Answer:

Option D. The number of oxygen atom is the same before and after the reaction.

Explanation:

From the question given above, the following were obtained:

Robin's equation:

H₂ + O₂ —> H₂O

Alex's equation

2H₂ + O₂ —> 2H₂O

To know which equation better represents the reaction, we shall determine which of the equation is balanced.

For Robin:

H₂ + O₂ —> H₂O

Element >>> Reactant >>> Product

H >>>>>>>>> 2 >>>>>>>>>> 2

O >>>>>>>>> 2 >>>>>>>>>> 1

Robin's equation is not balanced because the number of atoms of each element in the reactant and product are not equal.

For Alex:

2H₂ + O₂ —> 2H₂O

Element >>> Reactant >>> Product

H >>>>>>>>> 4 >>>>>>>>>> 4

O >>>>>>>>> 2 >>>>>>>>>> 2

Alex' equation is balanced because the number of atoms of each element in the reactant and product are equal.

Thus, option D gives the right answer to the question.


Related Questions

Propose a mechanism and predict the products for the solvolysis of 2-bromo-2,3,3-trimethylbutane in methanol.

Answers

Answer:

See explanation and image attached.

Explanation:

Solvolysis is a reaction in which the solvent is also the nucleophile. The reaction occurs by SN1 mechanism since it yields most stable carbocation. The SN1 mechanism predominates since a weak nucleophile/base is used.

The major product as shown is the image attached to this answer. The first step is the loss of the bromide ion followed by nucleophillic attack of the solvent. Loss of H^+ completes the mechanism.

CHEMISTRY HELP ASAP
Use this balanced equation for the two questions below:
2KClO3(s) → 2KCl(s) + 3O2(g)
9. How many moles of KClO3 are used to produce 9.9 moles of O2?

10. How many moles of O2 are produced from 11.2 moles of KClO3?

PLS SHOW WORK TOO THX

Answers

Answer:

1 mole of KClO_3 contains 3 moles of O.

10 moles of O_2 contains 20 moles of O.

You need 20/3 moles of KClO_3 to produce 10 moles of O_2

Explanation:

sana makatulong

The molecular weight (MW) of CuSO4 is 250g/mol. How many grams of CuSO4 are needed to make a 10 ml solution that has a molarity of 2.0 M?

Answers

Answer:

Explanation:

(The MW of CuSO4 is 250 g/mol).

Answer:

5 grams of CuSO4

Explanation:

First you make a stoichiometric relationship between the molarity and liters. So there is 2 mols per every liter. Then you put in the moleculur weight( for every mol there is 250 g). Then you have to get rid of the liters, so you times the equation by 0.01(this was found by 10ml converted into liters). After all of that you should end up with 5 grams of CuSo4

when iron rust it reacts with nitrogen from the air
true or false​

Answers

it is false it reacts with oxygen

give brainliest if right

To solve such this we must know the concept of oxidation reaction. Therefore, the given statement is incorrect. When iron rust it reacts with oxygen from the air.

What is chemical reaction?

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

In oxidation reaction, one of the element of the given compound oxidises to its higher oxidation state. Rusting is an example of oxidation reaction. The balanced equation for the rusting reaction can be given as

4Fe + 3O[tex]_2[/tex] + 6H[tex]_2[/tex]O → 4Fe(OH)[tex]_3[/tex]

Therefore, the given statement is incorrect.

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What is the temperature of an 11.2-L sample of carbon monoxide, CO, at 744 torr if it occupies 13.3 L at 55 °C and 744 torr? 3C The pressure is not changing, so it looks like a case where charles’ law can be use.

Answers

Answer: The tempearture of 11.2 L of CO is [tex]3.0^0C[/tex].

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

where,

[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.

are the final volume and temperature of the gas.

We are given:

[tex]V_1=11.2L\\T_1=?\\V_2=13.3L\\T_2=55^0C=(55+273)K=328K[/tex]

Putting values in above equation, we get:

[tex]\frac{11.2L}{T_1}=\frac{13.3L}{328K}\\\\T_1=276K=(276-273)^0C=3.0^0C[/tex]

Thus the tempearture of 11.2 L of CO is [tex]3.0^0C[/tex], pressure remaining constant.

What is the mass in grams of precipitate formed when 250.0 mL of 0.360 M ZnCl₂ is mixed with excess KOH in the following chemical reaction?
ZnCl₂ (aq) + 2 KOH (aq) → Zn(OH)₂ (s) + 2 KCl (aq)

Answers

Answer:

8.95 g

Explanation:

ZnCl₂ (aq) + 2 KOH (aq) → Zn(OH)₂ (s) + 2 KCl (aq)

First we calculate how many ZnCl₂ moles reacted, using the given concentration and volume:

250 mL / 1000 = 0.250 L0.360 M * 0.250 L = 0.090 mol ZnCl₂

Then we convert ZnCl₂ moles into Zn(OH)₂ moles [ Zn(OH)₂ is the precipitate, as it is the solid]:

0.090 mol ZnCl₂ * [tex]\frac{1molZn(OH)_2}{1molZnCl_2}[/tex] = 0.090 mol Zn(OH)₂

Finally we convert 0.090 Zn(OH)₂ moles into grams, using its molar mass:

0.090 mol Zn(OH)₂ * 99.424 g/mol = 8.95 g

The mass of a substance is the product of the molar mass and the moles of the substance. The mass of precipitate formed in the reaction is 8.95 gm.

What is Mass?

The mass of the substance is the weight of the compound or the molecule present in the sample.

The balanced chemical reaction is shown as:

[tex]\rm ZnCl_{2} (aq) + 2 KOH (aq) \rightarrow Zn(OH)_{2} (s) + 2 KCl (aq)[/tex]

Given,

Volume (V) of zinc chloride = 0.250 L

Molarity of zinc chloride (M) = 0.360M

Moles of zinc chloride are calculated as:

[tex]\begin{aligned} \rm moles &= \rm molarity \times volume \\\\&= 0.360 \times 0.250\\\\&= 0.090 \;\rm mol\end{aligned}[/tex]

Moles of zinc hydroxide from zinc chloride are calculated as:

[tex]0.090\;\rm mol \; ZnCl_{2} \times \dfrac{ 1\;\rm mol \;\rm Zn(OH)_{2}}{1\;\rm mol\; ZnCl_{2}} = 0.090 \;\rm mol[/tex]

Mass is calculated as:

[tex]\begin{aligned} \rm mass &= \rm moles \times molar \; mass\\\\&= 0.090 \times 99.424 \\\\&= 8.95 \;\rm gm\end{aligned}[/tex]

Therefore, 8.95 gm precipitate is formed.

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AN object has a volume
of 77ml and a mass of
429. What is the density
of this object?

Answers

Answer:

4.254320865115cm or simplied 4.25cm

Explanation:

Look at the diagram. Which shows the correct arrangement of electrons in water?

Answers

Answer:

Option 4

Explanation:

In water molecule, oxygen has -2 charge on it while the hydrogen has +1 charge and one atom of oxygen combines with two hydrogen atoms. A hydrogen need only two electrons to complete its octet (one electron is its own the second electron is shared by oxygen) and a oxygen needs 8 electrons (It has six of its own and two are shared by two hydrogen atom).

Hence, option 4 is correct

Answer:

Option 2

It's more balanced than the others

Morgan wants to compare the weather conditions at her school each day during the week. She decides to measure and record weather data each day at noon. Which of the following measurements would be least useful to report?


humidity

elevation

wind speed

air temperature

Answers

Answer: Air Temperature

3. Are the gates working and can be easily opened in case of
emergency?

Answers

Answer:

Yes, I think.

Explanation:

You cannot make an emergency door if you cannot open it easily. So if there is an emergency you need to be able to go threw it fast. So if there is a fire and you needed to just get out of there through the emergency door, just open it and you can get out.

The gates of an emergency exit must be easily opened in case of an emergency to let people out of the building.

It is required that building ought to have an emergency exit. The emergency exit is a door that can easily be opened so that people can leave via that door.

Hence, the gates of an emergency exit must be easily opened in case of an emergency to let people out of the building.

Learn more about emergency exit: https://brainly.com/question/4206267

Which is the limiting reactant?

Answers

Answer:

Explanation:

The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.

the limiting recsntjce is the size of the left colum

what are the examples of Biosphere


patulong po thank you ❣️❣️​

Answers

Answer:

[tex]\color{Blue}\huge\boxed{Answer} [/tex]

An example of the biosphere is where live occurs on, above and below the surface of Earth. The zone of planet earth where life naturally occurs, extending from the deep crust to the lower atmosphere. The living organisms and their environment composing the biosphere. The living organisms of the earth.

How many moles of OH−(aq) (hydroxide ions)are present in the balanced redox reaction?
NO3−(aq) + ClO−(aq) + H2O(l) → NO(g) + ClO2−(aq) + OH−(aq)

Answers

There are 4 moles of (aq) showed in the reaction i think

40 POINTS!!! Ice at 0.0 degrees C is combined with 50.0g of water at 75.0 degrees C. Calculate the grams of ice present initially if the entire mixture comes to a final temperature of 25.0 degrees C after the ice melts. Specific heat of water is 4.18 J/goC. SHOW WORK!

Answers

Answer:

mi = 31.28 g

Explanation:

According to the law of conservation of energy:

[tex]Heat\ Gain\ by\ Ice = Heat\ Lost\ by\ Water\\m_iL = m_wC\Delta T\\[/tex]

where,

mi = mass of ice = ?

L = Latent heat of fusion of ice = 334 J/g

mw =  mass of water = 50 g

C = specific heat of water = 4.18 J/g.°C

ΔT = change in temperature of water = 75°C - 25°C = 50°C

Therefore,

[tex]m_i(334\J/g) = (50\ g)(4.18\ J/g.^oC)(50^oC)[/tex]

mi = 31.28 g

Give an example of a model used in Earth science. Explain why models are particularly important to this field.

Answers

Answer:

Some examples include maps and globes. Conceptual Models - These models serve as a tool to piece together a variety of concepts together so that we can better conceptualize the phenomena under investigation.

Scientific models are used to explain and predict the behaviour of real objects or systems and are used in a variety of scientific disciplines, ranging from physics and chemistry to ecology and the Earth sciences

A weather balloon has a volume of 200.0 L at a pressure of 760 mm Hg. As it rises, the pressure decreases to 282 mm Hg.

a. Will the volume of the balloon increase or decrease? Why?

b. What is the new volume of the balloon? (Assume constant temperature)

Answers

Answer:

a. Increase

b. 539 L

Explanation:

Step 1: Given data

Initial volume (V₁): 200.0 LInitial pressure (P₁): 760 mmHgFinal volume (V₂): ?Final pressure (P₂): 282 mmHg

Step 2: Calculate the final volume of the gas

The pressure of the gas is inversely proportional to the volume. So, as the pressure decreases, the volume must increase. Assuming constant temperature and ideal behavior, we can calculate the final volume of the gas using Boyle's law.

P₁ × V₁ = P₂ × V₂

V₂ = P₁ × V₁/P₂

V₂ = 760 mmHg × 200.0 L/282 mmHg = 539 L

The molar mass of two equally sized samples of unknown gaseous compounds is shown in the table.

Molar Mass Comparison
Gas Molar Mass
X 28 g/mol
Y 44 g/mol
At STP, which describes the density and effusion of both gases? (4 points)

a
Gas X has a higher density and effuses faster than Gas Y.

b
Gas X has a higher density and effuses slower than Gas Y.

c
Gas X has a lower density and effuses slower than Gas Y.

d
Gas X has a lower density and effuses faster than Gas Y.

Answers

Answer:

D.  Gas X has a lower density and effuses faster than Gas Y.

Explanation:

I took the test.

Lower Density = effuse/ diffuse fasterLower Molar Mass = effuse/ diffuse faster

Gas X has a lower density and effuses faster than Gas Y. Hence, option D is correct.

What is density?

Density is the amount or the number of entities that can be contained in an area. It is denoted by ρ and is calculated as,

ρ = Mass ÷ Volume

Diffusion is the process of movement of a substance from the area of higher concentration to the area of lower concentration.

Effusion  is the process of a gas being poured out through a hole diametrically smaller than the structural exit of the container.

The gas with a smaller mass will diffuse slower in rate than the gas with a higher mass.

Hence, Gas X has a lower density and effuses faster than Gas Y.

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what is the major organic product obtained from the following sequence of reactions Br Li Et2O CH2I2 Zn(Cu)

Answers

Answer: Hello the complete question showing the sequence is attached below

answer : Option C ( cyclopropane )

Explanation:

The Major organic product obtained from the following sequence of reactions attached below is : cyclopropane

from the sequence of reactions the first product will be lithiated alkaline and it will react with Cu to form Gilman reagent while the Gilman reagent will now react with alkene iodide to form cis alkene . major organic product that would be obtained when cis alkene reacts with Simmons smith reagent will be Cyclopropane

attached below is the detailed description of the products and the major organic product

A 36.6-mol sample of Co represents how many atoms?

Answers

Answer:

2.20 x 10²⁵ atoms

Explanation:

Atoms of CO= 36.6-mol sample

From Avogadro's constant, which is

(6.022 × 10^ 23 atoms per mole)

Then

Number of atoms=[ 6.022 × 10^ 23 atoms/mole] × [36.6-mol]

= 2.20 x 10²⁵ atoms

Hence, number of atom is 2.20 x 10²⁵ atoms

Determine the equilibrium constant for the system N204 = 2NO2 at 25°C.
The concentrations are shown here: [N2O4]= 2.48x10-2M, [NO_]=1.41x10-2M.
HURRRYYY

Answers

Answer: K = 8.01 ·10^-3 M

Explanation:   K = [NO2] ² / [N2O4] = (0.0141 M)² / 0.0248 M = 0.00801 M

Chemistry question balance equations

Answers

Answer:

I don't understand this question

1. How is the law of conservation of mass shown by a balanced chemical equation?
A) The subscripts must be the same on both sides of the equation.
B) The total volumes of the substances must be the same on both sides of the equation.
C) The coefficients must be the same on both sides of the equation.
D) The number of each type of atom must be the same on both sides of the equation.

Answers

Answer:

D

Explanation:

hope this helps

5.Name the compound below

Answers

Answer:

There isn't anything below, but i can help if you edit the question and put it there

Explanation:

~Bre

There is no picture below

Which of the following limits a population's growth?

Answers

Answer:

hereeee

Explanation:

Limitations to population growth are either density-dependant or density-independent. Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size.

Answer: environmental factors

Explanation:

A change In which properly of light will have no effect on whether or not the photoelectric effect occurs

Answers

Answer:  intensity is the answer. Intensity has no affect on whether or not the photoelectric effect occurs.

Explanation:

Explain what is meant by a river’s load, and describe how the load is carried.
Please hurry I m timed T-T

Answers

Answer:

A rivers load is gravel and sand. It is carried by being dragged, rolled, and bounced along the bed of the river.

Explanation:

Answer:

the amount of gravel and sand at a river

the load is carried by the moving water

Every force has a what?

Answers

Answer:

What do you mean Every force has a what?

Answer:

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. ... The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.

Because a water molecule has a negative end and a positive end it displays?

Answers

Answer:

A water molecule displays polarity by having negative and positive ends. Due to this charge difference, a water molecule is called a dipole.

Explanation:

Show the work. Convert 150 mm Hg to psi.

pls help me, thanks

Answers

Answer:

2.9 psi

Explanation:

Pressure (mmHg) = 150 mmHg

Pressure (psi) =?

The pressure in pound per square inch (psi) can be obtained as follow:

51.715 mmHg = 1 psi

Therefore,

150 mmHg = 150 mmHg × 1 psi / 51.715 mmHg

150 mmHg = 2.9 psi

Thus, pressure in pound per square inch (psi) is 2.9 psi.

A student placed a small piece of magnesium ribbon in a conical flask and added
60 mL hydrochloric acid. The student observed that when the hydrochloric acid
came into contact with the magnesium ribbon, bubbles formed indicating the
release of hydrogen gas. The magnesium dissolved and magnesium chloride
solution formed. Based on the student's observations, which type of reaction
occurred?

Answers

Answer:

Single replacement reaction

Explanation:

Let us try to write down the reaction equation for the reaction of a magnesium  ribbon with hydrochloric acid.

Mg(s) + 2HCl(aq) ------> MgCl2(aq) + H2(g)

A single replacement reaction is a type of chemical reaction in which one element is replaced by another element in a compound.

In this reaction, magnesium replaced hydrogen to form the product. Hence it is a single replacement reaction.

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