Which of the following shows the combustion of a hydrocarbon?

[tex]\huge\underline\mathtt\colorbox{cyan}{A. Element L}[/tex]

Explanation:

Because the unidentified element has exactly the same Bright-Line Spectra of wavelength in nanometeres as does element L.

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Answer:

Alkaline fuel cells use an alkaline electrolyte such as potassium hydroxide or an alkaline membrane that conducts hydroxide ions rather than protons.

Explanation:

OR USE GATORADE AND POWERADE. BE A MAN.

Answer:

240g

Explanation:

Using the equation m=pV, where m=mass, p=density, and V=Volume

m=(6)(40)=240

m=240

Answer:

3Mg+2FeCl3------------3MgCl2+ 3Fe

Answer:

The shape of a molecule is mostly determined by repulsion among the pairs of electrons around a central atom.

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Answer:

15.5 gm

Explanation:

What is the mass of phosphorus that contains twice the number of atoms found in 14 g of iron?

[Relative atomic mass : P = 31; Fe = 56]

14 gm Fe = 14gm/ 56 gm/mole = 14 mole gm/56gm = 14/56 mole

0.25 moles

2 X 0.25 = 0.5 moles

1 mole P = 31 gm

so

0.5 moles P =31/2 =15.5 gm

Answer:

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Explanation:

Answer:

result = 310

significant figures =  2

Explanation:

How to round significant figures:

look the first non-zero digit if rounding to one significant figure, look the digit after the first non-zero digit if rounding to two significant figures. draw a vertical line after the place value digit that is required.look at the next digit.

result = 310

significant figures = 2

Answer: bro- i have no idea wat science that is but heres the water cycle-

Based on the balanced equation, the mole ratio of Iron to Sulphur is 8 to 1.

This means that for every mole of sulfur, 8 moles of iron is needed for the reaction.

∴ since the moles of Sulfur = 8.49 moles

                 ⇒ moles of Iron = 8.49 moles × 8

                                            = 67.92 moles

Taking into account the definition of calorimetry, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.

In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of heat that a body can receive or give up without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gaseous) does not change. Since the molecular structure does not change, a change in temperature is observed.

In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

1800 J= 4.18[tex]\frac{J}{gC}[/tex]× 5 g× ΔT

Solving:

1800 J ÷ (4.18[tex]\frac{J}{gC}[/tex]× 5 g)= ΔT

ΔT= 86.12 C

In summary, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.

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Answer:

0.25

Explanation:

no.of moles =10/40

Explanation:

If the pH is between 0 and 7, then we have an acid.

If the pH is between 7 and 14, then we have an alkaline base.

If pH = 7, then it's neutral.

Answer:

0-7

Explanation:

Hope this helps!

Answer: smaller, larger

Explanation:

Cations are always {smaller} than the parent atom. Anions are always {larger} than the parent atom.

Cations are always smaller than the parent atom, and anions are always greater than the parent atom.

The term "parent atom" refers to an atom that has not yet undergone any chemical transformation. A parent atom is one that is discovered in its initial state.

Because they contain fewer electrons while maintaining the same nuclear charge, cations are always smaller than their parent atoms. Because the protons in the nucleus are holding the remaining electrons more tightly, their radii are less than those of the parent atoms. In the case of anion, this is the opposite.

Due to variations in electron-electron repulsion, the ionic radii of cations and anions are always less or bigger than the parent atom, respectively. The trends in ionic radius follow those in atomic size.

Thus, Cations are always smaller than the parent atom, and anions are always greater than the parent atom.

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Answer:

Explanation:

The number of formula units can be found by using the formula

N = 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 = 0.002 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

When a substance is heated ,the kinetic energy of its molecules also increase.

Explanation:

K.E is directly proportional to T

The transfer of heat will continue as long as there is a difference in temperature between the two locations. Once the two locations have reached the same temperature, thermal equilibrium is established and the heat transfer stops.

Heat is transferred from a warm body to a cooler body. The temperature of the warm body drops while the temperature of the cooler body rises. When the two temperatures are equal, thermal equilibrium is attained, and the heat transfer stops.

Answer:

answer

Explanation:

Ionic bond is a type of chemical bond that attract between oppositely charged ions.

Even at moderate temperatures, attractions between molecules seem to have little effect on the elasticity of gas-gas collisions is as a result of Choice B: Collisions are so brief, and molecules moving so fast, the attractions have insufficient time to significantly affect the system.

As a result of the high kinetic energy of gases; the movement of gases is so fast and randomised.

As such, during gas-gas collisions; The collisions are so brief and molecules moving so fast, the attractions have insufficient time to significantly affect the system.

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Explanation:

divide the weight in grams by the atomic mass from the periodic table, then multiply the result by Avogadro's number..

Hope this works!!

Answer:

Radioactive Basement in Chernobyl

"We had to be especially cautious near roads and in the city of Pripyat, there are regular security patrols in those areas. Unfortunately, the legal 'day' tours are not allowed to enter any of the buildings in Pripyat as the structural integrity of some buildings is questionable."

Explanation:

Answer:

kdkekejdjejeneneenendjenejekeke do do do do do do d

Answer:

go ahead bro

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The numbers that balance the following equation: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl is 2, 1, 2.

BALANCING EQUATION:

4NaCl + 2SO2 + 2H2O + O2 → 2Na2SO4 + 4HCl

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Answer:212

Explanation:yeah

Which of the following examples involves an exothermic change.

Answer : C

Explanation : Gaseous water particles coming together to form fog

Hope this helps you!

Gaseous water particles coming together to form fog is an exothermic change due to release of thermal energy.

What is exothermic change?

An exothermic reaction is defined as a reaction that releases heat energy to the surrounding environment. It include any combustion process, rusting of iron, and freezing of water.

In conclusion, we can say that Gaseous water particles coming together to form fog is an exothermic change due to release of thermal energy.

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The circumstances that the system is exposed to may be altered in such a way as to cause a change in the chemical equilibrium. When we do this, we are said to be "stressing the balance."

In a chemical process that has reached equilibrium, one method is to either add or remove a product or a reactant. When more of a reactant is introduced, the equilibrium changes to alleviate the pressure, which results in the production of more products.

This is further explained below.

Generally,  When more product is introduced, the equilibrium moves away from products and toward reactants in an effort to lower the level of stress.

In the event that either the reactant or the product is withdrawn from the system, the equilibrium changes such that more of the corresponding substance is produced to compensate for the loss.

According to Ch/atelier's Principle, which claims that if a reaction in equilibrium is disturbed, the equilibrium will change to counterbalance that change, this indicates that if a reaction is in equilibrium, the equilibrium will alter to counteract that change.

If a solution has a large number of hydrogen ions, the pH of the solution will be low, and it will be classified as an acidic solution.

In conclusion, On the other hand, a solution is said to have a high pH and be in the basic state if it contains a low quantity of hydrogen ions in its composition.

The ratio of the concentration of hydrogen ions to the concentration of hydroxide ions is negative and inversely proportional.

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Each atom in the bond contributes one valence electron, forming a shared pair in a single covalent bond. electrons that are  valence electrons of the atom. Two valence electrons are lost by Sr when forming SrI[tex]_2[/tex].

A valence electron is an electron that is part of an atom's outer shell in chemistry and physics. If the outer shell is open, the valence electron can take part in the creation of a chemical bond.

The electrons in the s and p orbitals are those that are in question. Core electrons are those found in the inner shell. These electrons are vital to the majority of chemical processes because they have higher energy than the electrons in inner orbits. The electrons farthest from the nucleus are the electrons that are  valence electrons of the atom. Two valence electrons are lost by Sr when forming SrI[tex]_2[/tex].

Therefore, two valence electrons are lost by Sr when forming SrI[tex]_2[/tex].

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Answer:

I don’t know what recording station you’re referring to but, When seismic waves reach the seismograph, a graphical record, or seismogram, is produced

Explanation:

The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.

The seismic wave has been the radiation, with the result of the movement of the earth surface. The movement has been result in the earthquake.

The intensity of the earthquake has been measured by seismograph on the Richter scale. The seismic wave results in the movement of the leads to the production of the seismograph.

The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.

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