please help!





For the reaction:
2H2 (g) + O2 (g) —-> 2H2O (l)

calculate the change S of system and the change of S of surroundings

Law of conservation of mass gives clear evidence that matter is conserved in the chemical reaction

Experiments in the 1700s by a French chemist named Antoine Lavoisier led to the conclusion of conservation of mass. Lavoisier carefully measured the mass of reactants and products in multiple chemical reactions.

He carried out all the reactions inside a sealed jar. In each and every case, the total mass of the jar and its contents remained the same after the reaction as it was before the reaction took place.

This showed proof that matter was neither created nor destroyed in the reactions. Another outcome of Lavoisier’s research was the discovery of oxygen which was also a remarkable discovery as we all know.

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. For example, the carbon atom in coal becomes carbon dioxide when it is burned into ashes. The carbon atom changes from a solid structure to a gas but its mass remains the same. It does not change at all.

All these observations led to the theory that mass/ matter is conserved in a chemical reaction

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¿What is silicic anhydride?

Silicon dioxide is a delicate, rough and light material. act as a substance thickener and free circulation.

In the cosmetic and cleaning industry, it allows the production of laundry soaps and all kinds of detergents. Incorporated into the paste for teeth, and combined with calcium carbonate, helps us remove plaque or tartar dental safely.

It is also used in the manufacture of glass, ceramics and cement. It is used in manufacture of sandpaper and blocks. As a catalytic converter, it acts in all acid production processes sulfuric. It is also used as a sharpener for the manufacture of discs, inks of printing, adhesives and polyester resins. Finally, it is used in the production of sand for cats.

Answer:

As we go down in groups in periodic table , number of shells increases than that in the previous group which tends to increase the size of atom eventually increasing the atomic radius.

Explanation:

For group 13:

Boron has 2 shells

Aluminum has 3 shells

Gallium has 4 shells

Indium has 5 shells and

Thallium has 6 shells.

Simple!

So the size goes on increasing down the group!

The heat will transfer from one object to the other based on the temperature gradient. If the temperature of water is greater than that of the iron bar, the iron bar will gain energy .

The heat energy transfer from a hot body to a colder body and which can be interpreted based on the law of conservation of energy. There are three modes of heat transfer namly, conduction, convection and radiation.

Conduction is the energy transfer mode in solids, where the closely packed molecules will transfer heat to the neighbouring molecules in the chain. Convection is taking place in liquids and radiation is for gases.

When a metal of high temperature is dropped into water, the water temperature will rise since heat will transfer from the hot metal to the cold water. If the water has higher temperature than the metal, then the metal will gain energy.

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121.523 nm  is the wavelength (in nm) of the photon absorbed for a transition of an electron.

[tex]n_1=1 ,n_2=2[/tex]

[tex]1/\lambda=1.09737 *10^7*1/1^2 *1/2^2=8230275m^-1[/tex]

[tex]\lambda=1/8230275[/tex]

1.215x10^-7 m=121.523 nm

since the dating between wave frequency and wavelength is inverse, gamma rays have extraordinarily tiny wavelengths that are best a small portion of the size of atoms, whereas different wavelengths can extend as a long way as the universe. No of the medium they are passing via, electromagnetic radiation's wavelengths are commonly expressed in phrases of the vacuum wavelength, but this isn't always said explicitly.

The wavelength of electromagnetic radiation influences how it behaves. speed of mild = wavelength x frequency power = Planck's consistent x frequency Wave wide variety = 1/wavelength in cm. The wavelengths of different elements of the electromagnetic spectrum are displayed collectively with a difficult approximation of the wavelength size.

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Answer:

Explanation:

As a result, the reaction of propane (C H) 3 8 and oxygen should produce carbon dioxide, water, and heat as products, and the balanced chemical equation will be: C H3 8 + 5O2 3CO2 + 4H O2 + heat. Reactants have the next highest potential power level when compared to materials.

Answer:

water and carbon dioxide

Explanation:

Propane undergoes combustion reactions in a similar fashion to other alkanes. In the presence of excess oxygen, propane burns to form water and carbon dioxide.

I hope this helps!

Nature contains questions that can be answered by science.

The correct option is B).

What is nature?

The word nature refers to the things we can see with our eyes generally they include: plants, animals, the landscape, and other features and products of the earth, as opposed to humans or human creations.

The science of nature helps us to understand how the world and the universe around us work.

There are five major branches of the Science of Nature:

.Chemistry

.Astronomy

.Earth science

.Physics

.Biology.

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Answer

A. Astrology

Explanation:

The rest isnt science its just like puedoscience so its A.

Answer: i think its empirical

Explanation:

The molecular formula of the compound, given that it contains only hydrogen and sulfur is H₄S₂

We'll begin by obtaining the mass of sulfur and hydrogen. This is illustrated below:

Mass of S = (32 / 64) × 10

Mass of S = 5 g

Mass of H = (mass of compound) – (mass of S)

Mass of H = 5.31 – 5

Mass of H = 0.31 g

Next, we shall determine the empirical formula

Divide by their molar mass

H = 0.31 / 1 = 0.31

S = 5 / 32 = 0.156

Divide by the smallest

H = 0.31 / 0.156 = 2

S = 0.156 / 0.156 = 1

Thus, the empirical formula is H₂S

Finally, we shall determine the molecular formula. Details below

Molecular formula = empirical × n = mass number

[H₂S]n = 68

[(2×1) + 32]n = 68

34n = 68

Divide both sides by 34

n = 68 / 34

n = 2

Molecular formula = [H₂S]n

Molecular formula = [H₂S]₂

Molecular formula = H₄S₂

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1. Tomatoes taste better when fish DNA is inserted into them.--- opinion

2. Genes from different species can be spliced into an organism to produce desired traits.--- fact

3. Cereal is more filling when cow DNA is inserted into it.--- opinion

4. Testing GMOs on rats and cockroaches is ethically wrong. --- opinion

5. The genes from GMO plants can spread to natural species if they successfully mate. --- fact

6. GMO crops can be designed to grow in environments where the natural species can’t grow.--- fact

A GMO, or genetically change organism, is a plant, animal, microorganism, or another organism whose genetic rouge has been amended in a laboratory using genetic engineering or transgenic technology.

The United States Department of Agriculture considers GMOs to be plants or animals with heritable swaps introduced by genetic engineering or traditional methods, while GEO correctly refers to organisms with genes found, eliminated, or rearranged using molecular biology, particularly recombinant DNA.

So we can conclude that a genetically modified organism is any organism whose genetic matter has been altered using genetic engineering techniques.

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Drag each label to the correct location on the chart.

Classify the statements related to GMOs as bias or fact.

Tomatoes taste better when fish

DNA is inserted into them.

Genes from different species

can be spliced into an organism

to produce desired traits.

Cereal is more filling when a cow

DNA is inserted into it.

Testing GMOs on rats and

cockroaches is ethically wrong.

The genes from GMO plants

can spread to natural species

if they successfully mate.

GMO crops can be designed to

grow in environments where

the natural species can’t grow.

The empirical formula for Cl₂O₆ is ClO₃.

The empirical formula of any chemical compound is the atoms ratio present in the formula to simplest whole number. it is the simplest formula of any chemical compound.

the given molecular formula is :

Cl₂O₆ : by dividing the both the subscripts to 2 , to get simplest whole number. we get :

empirical formula : ClO₃

The molecular formula is Cl₂O₆. the molecular formula of any chemical formula is the representation of atom in the chemical equation with subscript to indicate number of atoms in the molecule.

Thus, The empirical formula for Cl₂O₆ is ClO₃.

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Considering the definition of atomic mass, isotopes and atomic mass of an element, the isotope 210-X has a percent natural abundance of 90% and the isotope 212-X has a percent natural abundance of 10%.

The atomic mass is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.

Isotopes are called atoms of the same element, whose nuclei have the same number of protons but a different number of neutrons, and therefore differ in mass number.

The atomic masses of chemical elements are calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.

In this case, you know:

Then, the average mass of X can be expressed as:

210 amu×x + 212 amu×(1 -x)= 210.2 amu

210 amu×x + 212 amu×1 -212 amu×x= 210.2 amu

210 amu×x + 212 amu -212 amu×x= 210.2 amu

210 amu×x -212 amu×x= 210.2 amu - 212 amu

(-2 amu)x= -1.8 amu

x= (-1.8 amu)÷ (-2 amu)

x= 0.9= 90%

Finally, the relative abundance of the isotopes is:

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Answer:

89.1Joule Because when Multiply The Half Of Mass With The Square of Velocity we Get We Get Eighty nine Point One

The number of moles of O₃ required to react with 0.54 mole of NH₃ is 0.36 mole

First, let us let us consider the balanced equation, to obtain usefull information as regarding the question.

6NH₃ + 4O₃ -> 3N₂O + 9H₂O

From the balanced equation above,

6 moles of NH₃ reacted with 4 moles of O₃

With the information obtained from the balanced equation, we can succefully determine the number of mole of O₃ required to react with 0.54 mole of NH₃. Details below

From the balanced equation above,

6 moles of NH₃ reacted with 4 moles of O₃

Therefore,

0.54 moles of NH₃ will react with = (0.54 × 4) / 6 = 0.36 mole of O₃

Therefore, we can conclude that the number of mole of O₃ required is 0.36 mole

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The intermolecular forces that exist between Br₂ and CCI₄ is dispersion force and London dispersion force

Intermolecular forces that arises between the positive components of one molecule and the negative components of another molecule and in the Br₂ there is London dispersion force because this is the diatomic element are nonpolar and nonpolar molecules are only capable temporary dipoles and the intermolecular forces between CCI₄ is the London dispersion force of attraction which is also known as induced dipole induced dipole and it is referred to as induced dipole because it is an attraction between temporary dipole in the structure

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At STP, O2(g) and O3(g) are two forms of the same element that have option 1: different molecular structures and different properties

Due to the release of heat during its breakdown into oxygen, ozone is less thermodynamically stable than oxygen. Ozone is made up of three oxygen molecules, making it in an unstable state. In order to become stable, ozone gives up one of its oxygen molecules in order to return to its diatomic state.

Therefore, Ozone (O2) and ozone (O3) both include oxygen atoms, but they differ in terms of their physical and chemical characteristics. Ozone has a strong, pungent odor, whereas oxygen is odorless. While oxygen liquefies at a much lower temperature than ozone, at -112 degrees Celsius, ozone does so.

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See full question below

At STP, oxygen exists in two forms, O2(g) and O3(g). These two forms of oxygen have 1. different molecular structures and different properties 2. different molecular structures and the same properties 3. the same molecular structure and different properties 4. the same molecular structure and the same properties

Answer: It is conduction.

Explanation: Heat travels through solid substance by the process of conduction. By conduction heat from the fire heats up the pot and reaches the rice grains at bottom.

Answer:

the answer is that you should prove it

The pH of a buffer that is 0.086 M HF and 0.386 M LiF when the K₂ for HF is 3.5x 10-4 is 2.802

The pH of a buffer solution is given by Henderson Hasselback equation.

pH=pKa+log[A-]/[HA]

Substituting the values, we get

pH=-log(3.5x10^-4)+log(0.086/0.386)

pH=-log(3.5x10^-4)-0.653

pH=3.455-0.653

pH=2.802

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The temperature of a vessel  is 296.43 Kelvin when pressure reads 1.250 atm.

Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness.

At standard temperature and pressure, when pressure is 1.000 atm the value of temperature is 273,15 K.

If the pressure at temperature T changes to 1.250 atm

p1 = 1. 000 atm

T1 = 298.15 k

P2 = 1.250

T2 = ?

We apply Gay-Lussacs law

Using P1/ T1 = P2 /T2 all at constant volume

T2 =  296.43 K.

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The mass of water vapor that will be produced when iron hydroxide decomposes to form iron oxide and water vapor is 0.126 grams.

The mass of a substance can be calculated stoichiometrically. Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, iron hydroxide decomposes to form iron oxide and water vapor. If 0.500 g of iron hydroxide are decomposed, the mass of water vapor produced can be calculated as follows;

2Fe(OH)₃ → Fe₂O₃ + 3H₂O

Based on the above equation, 2 moles of iron hydroxide decomposes into 3 moles of water vapor.

moles = 0.5g ÷ 106.87 g/mol = 0.00468mol of iron hydroxide.

0.00468 × 1.5 = 0.00701moles of water vapor.

mass of water vapor = 0.00701 moles × 18g/mol = 0.126g

Therefore, 0.126 grams of water vapor will be produced from 0.500 grams of iron hydroxide.

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Yes, the benefits of using nuclear energy outweigh the risks as  nuclear energy has help to solve electricity issues in the United states and other countries.

The benefits of nuclear energy  is that it is one of the cleanest forms of energy. Its carbon footprint is also among the smallest. It is among the solutions to the energy gap. It is crucial to how we respond to greenhouse gas emissions and climate change.

Note that A clean energy source with no emissions is nuclear. It produces energy by fission, which is the splitting of uranium atoms to release energy. With no toxic byproducts created from fossil fuels, the heat from fission is used to create steam that powers a turbine and produces electricity.

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The concentration of sodium ions in a solution made by diluting 10.0 mL of a 0.774 M solution of sodium sulfide to a volume of 100 mL would be 0.1548 M.

According to the dilution principle, the number of moles of solutes in a solution before and after dilution must be the same. This is expressed as the following equation:

[tex]m_1v_1 = m_2v_2[/tex]

Where [tex]m_1[/tex] is the molarity before dilution, [tex]v_1[/tex] is the volume before dilution, [tex]m_2[/tex] is the molarity after dilution, and [tex]v_2[/tex] is the volume after dilution.

In this case, [tex]m_1[/tex] = 0.774 M, [tex]v_1[/tex] = 10.0 mL, [tex]v_2[/tex] = 100 mL.

[tex]m_2[/tex] = [tex]m_1v_1/v_2[/tex]

     = 0.774 x 10/100

      = 0.0774 M

Thus, the new concentration of the sodium sulfide solution would be 0.0774 M.

Mole of the final solution: 0.0774 x 0.1 = 0.00774 mol

Sodium sulfide formula = [tex]Na_2S[/tex] ---> [tex]2Na^+ + S^{2-[/tex]

Equivalent mole of sodium ion = 0.00774 x 2

                                                    = 0.01548 mol

The concentration of sodium ions = mol/volume

                                                  = 0.01548/0.1

                                                  = 0.1548 M

In other words, the concentration of the sodium ions in the diluted solution would be 0.1548 M.

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Answer: 2 moles

Explanation:

In the balanced equation, it can be seen that everything reacts in a 1:1 mol ratio except water (H2O) as determined by the coefficient. It is simple stoichiometry, 1 mol CO2 * 2 mol H2O/1 mol CO2 = 2 mol CO2. After doing the math, the CO2 cancels out, leaving how many moles of H2O there are.

10) A gas in the container with a volume of 204 mL contains 0.56 moles of gas.  Gas is removed from the container so that it contains 0.26 moles. The new volume of gas in the milliliters is 94.7 mL.

According to the Avogadro's law, equal volumes of different gases contain equal number of molecules. It is shown by the mathematical formula

V₁/n₁=V₂/n₂

Where V₁=204 mL, n₁=0.56 mol, V₂=?, n₂=0.26 mol. Rearrange the formula for V₂

V₂=(V₁×n₂/n₁)

Plug all values in the formula and find V₂

V₂=(204 mL×0.26 mol/0.56 mol)

V₂=53.04 mL/0.56

V₂=94.7143 mL≈94.7 mL

Therefore, the new volume of gas is 94.7 mL.

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Answer:

the three states of matter are solid liquid and gas so the one that would also have fluids is liquid

The mass of the zinc that is required is 184.6 g.

We know that the term reaction has to do with the combination of two substances. Often times, we would have a new substances that is formed which is the product of the reaction.

Let us look at the reaction between zinc and copper II sulfate and that reaction is written as; [tex]Zn(s) + CuSO_{4} (aq) ------ > ZnSO_{4} (aq) + Cu(s)[/tex]

Number of moles of the copper sulfate = 454 g/159.61 g/mol

= 2.84 moles

Now, the reaction is 1:1  we can see;

Number of moles = mass/molar mass

Mass of Zn = 2.84 moles * 65 g/mol

= 184.6 g

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Explanation:

2.50 × 2/ 1

the answer is

5 moles