Rubidium lies below potassium in Group 1. Predict the approximate value for the melting point of rubidium. Give a reason for your answer.

Option C. Decomposition reaction: a substance involved is oxygen.

A decomposition reaction is a type of chemical reaction where a single compound is broken down into two or more simpler substances. In the reaction, energy is typically used to break down the bonds that hold the molecules of the compound together. Oxygen is often a substance involved in the reaction, as it is used to provide the energy needed to break down the compound. When oxygen is involved, the reaction is sometimes referred to as an oxidation reaction.

Since the question is not complete, here's the full task:

Which of the following statements correctly identifies the decomposition reaction and describes a substance involved?

Choose the right option:

A. Combustion reaction: a substance involved is oxygen

B. Combustion reaction: a substance involved is a hydrocarbon

C. Decomposition reaction: a substance involved is oxygen

D. Decomposition reaction: a substance involved is a hydrocarbon

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... I hope this helps

True

Answer:

True

Explanation:

Beacuse you use Fossil Fuels for gas and its oil as well

If a water body has large amount of suspended inorganic materials, it will be yellowish to reddish, depending on the components of the inorganic materials in color hence b. is the correct option.

A water body has all kinds of materials and compounds found in it which dictates it's color. If a water body has a large amount of suspended inorganic materials, the color will be affected by those materials. Depending on their components, the water may appear yellowish to reddish. This therefore rules out all the other options of blue, green and clear colours. The remaining correct option is b.

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Answer:

cool

Explanation:

Answer:

Explanation:Erosion is a physical change

Gasohol is a blend of gasoline and ethanol. To determine the maximum work that can be obtained by burning 1.003 mol of C2H5OH at 25°C and 1 atm, the Gibbs free energy equation can be utilized. What is Gibbs free energy equation? Gibbs free energy equation is a thermodynamic equation that quantifies the maximum quantity of work that may be obtained during a chemical reaction. T

he equation is as follows: ΔG = ΔH - TΔSThe values of ΔH and ΔS are calculated from thermodynamic tables or by calculating the enthalpy and entropy of the products and reactants, and the temperature, T, is usually specified in Kelvin. The change in Gibbs free energy, ΔG, is the maximum amount of energy that can be obtained from the reaction in the form of useful work if the reaction takes place at constant pressure and temperature. The reaction will proceed spontaneously if ΔG is negative. And if ΔG is positive, the reaction will not take place spontaneously. The solution to this problem is shown below:

First, let's figure out how much heat is produced when one mole of C2H5OH is burnt.ΔHrxn = [2(moles of CO2)(-393.5 kJ/mol) + 3(moles of H2O)(-285.8 kJ/mol)] - [(moles of C2H5OH)(-277.7 kJ/mol)]ΔHrxn = [2(2.006 mol)(-393.5 kJ/mol) + 3(3.009 mol)(-285.8 kJ/mol)] - [1.003 mol(-277.7 kJ/mol)]ΔHrxn = -2043.5 kJ/mol. Now, we'll figure out the entropy change for the reaction.ΔSrxn = [2(moles of CO2)(213.8 J/mol-K) + 3(moles of H2O)(69.9 J/mol-K)] - [(moles of C2H5OH)(160.7 J/mol-K)]ΔSrxn = [2(2.006 mol)(213.8 J/mol-K) + 3(3.009 mol)(69.9 J/mol-K)] - [1.003 mol(160.7 J/mol-K)]ΔSrxn = -104.3 J/mol-KThe temperature in Kelvin is 25°C.273 + 25 = 298 KΔG = ΔH - TΔSΔG = -2043.5 kJ/mol - (298 K)(-104.3 J/mol-K)/1000ΔG = -2032.6 kJ/mol. Therefore, the maximum work that can be obtained by burning 1.003 mol of C2H5OH is 2032.6 kJ/mol, which is the value of ΔG.

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As a substance moves across line X from left to right on the Methanol phase diagram, it undergoes a change in state from solid to liquid.

The above change in state is due to an increase in temperature and pressure, which causes the intermolecular forces between the Methanol molecules to weaken, allowing them to move more freely and transition from a solid state to a liquid state. Therefore, the intermolecular forces between the molecules are decreasing as the substance moves across line X.

On the other hand, as a substance changes across line Z from the right to the left, it undergoes a change in state from gas to liquid. This change in state is due to a decrease in temperature and pressure, which causes the intermolecular forces between the Methanol molecules to strengthen, resulting in the gas molecules losing energy and transitioning to a liquid state. Therefore, the intermolecular forces between the molecules are increasing as the substance moves across line Z.

In summary, as a substance moves across line X from left to right, the intermolecular forces between the molecules are decreasing, while as a substance moves across line Z from right to left, the intermolecular forces between the molecules are increasing.

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See full question below



ANALYZING DATA

Analyze Phase Diagrams

A phase diagram shows, at any given temperature and pressure, the state of a certain substance, and the conditions where different states can be in equilibrium. The triple point, shown at where the three lines X, Y, and Z meet, is the temperature and pressure where solid, liquid, and gas can coexist. The critical point shows the minimum temperature and pressure where a substance can exist as both a liquid and gas. It is the point where it becomes a supercritical fluid. Supercritical fluids are used for industrial processes, including an alternative way to dye fabrics.

Methanol Phase Diagram

Pressure (atm)

80

Laqurd

Solid X

Y

1

Z

Gas

65

240

-97.65

-97.45

Temperature (°C)

sep interpret data explain what is happening to the intermolecular forces as a substance moves across line x from the left to the right. how does this compare to the molecular behavior as a substance changes across line z from the right to the left?

100.0 Cal of energy is 418.4J, 250 joules of energy is 59.75cal, The reaction of Silicon and chlorine gas is exothermic, the transferred energy is 1193825kJ, the reaction of iron oxide and CO is exothermic.

a.) Given the energy is in = 100 Cal

We know that 1 calorie (cal) is equal to 4.184 joules. Then,

100 cal = 100 * 4.184 joules = 418.4J

b.) Given the energy in joules = 250J

Similarly using above equation we see that:

250 J = 250/4.184 = 59.75cal

c.) The energy of silicon = 425kJ

The silicon is reacted with chlorine gas to produce silicon dichloride.

The required Thermochemical equation is:

\(2 Si(s) + 3 Cl2(g) -- > 2 SiCl2(s) + 425 kJ\)

The reaction is exothermic because energy is given off in the form of heat. The energy released is enough to overcome the energy required to break the existing bonds in the reactants, resulting in a net release of energy.

d.) The amount of energy transferred in the reaction of Silicon with Chlorine gas is equal to the amount of energy released during the reaction. It can be calculated as:

Energy Transferred = (Molar Mass of Silicon)*(Change in Enthalpy)

The Molar Mass of Silicon is = 28.09 g/mol

the Change in Enthalpy is 425 kJ.

Q = 28.09 g/mol *  425 kJ

Q = 11938.25kJ

e.) Given the energy produced by the reaction = 67.2kJ

It is given that Iron (II) oxide reacts with carbon monoxide. It can be represented as: \(FeO + CO -- > CO2 + Fe + 67.2 kJ\)

The reaction is exothermic because it releases energy (67.2 kJ). Exothermic reactions are those that release energy in the form of heat, light, or sound.

f.) The energy available = 547kJ

We know that the mass of CO can be calculated as:

Mass of CO = (Energy available for reaction - Heat of reaction)/(Heat of formation of CO)

Mass of CO = (547 - 67.2)/(110.5 kJ/mol)

Mass of CO = 4.79 mol

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from google, so I think the answer to that question is the second one

As per the aleks data tab the chemical species can be given as per the following: Ag<Zn<Mg<Na

This is not a redox reaction. None of the species are reduced and none are oxidized.

The decreasing power will be greater the lower the reduction potential.

A chemical reaction known as an oxidation-reduction (redox) reaction includes the exchange of electrons between two substances. An oxidation-reduction reaction is any chemical process in which a molecule, atom, or ion experiences a change in its oxidation number as a result of gaining or losing an electron.

Redox reactions are those in which one chemical is reduced and another is oxidized. Here, oxygen is being introduced, which causes C to oxidize into CO, and oxygen is being removed, which causes ZnO to decrease to Zn. It is a redox reaction as a result.

Redox reactions are those in which there is a change in the oxidation number, with both an increase and a drop in number.

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Answer:

Given its huge success in describing the natural world for the past 150 years, the theory of evolution is remarkably misunderstood. In a recent episode of the Australian series of “I’m a Celebrity Get Me Out of Here”, former cricket star Shane Warne questioned the theory – asking “if humans evolved from monkeys, why haven’t today’s monkeys evolved”?

Similarly, a head teacher from a primary school in the UK recently stated that evolution is a theory rather than a fact. This is despite the fact that children in the UK start learning about evolution in Year 6 (ten to 11-year-olds), and have further lessons throughout high school. While the theory of evolution is well accepted in the UK compared with the rest of the world, a survey in 2005 indicated that more than 20% of the country’s population was not sure about it, or did not accept it.

Explanation:

Answer:

Humans did not evolve from monkeys

Explanation:

Us humans and apes had a common ancestor that split in path millions of years ago. This resulted in our ancestor and ape ancestor. Monkeys may of came from ape, but we definitely did not evolve from monkey

Explanation:

To find the volume of dry hydrogen gas at STP, we need to use the combined gas law, which relates the pressure, volume, and temperature of a gas.

The combined gas law is given by:

(P1 V1) / (T1) = (P2 V2) / (T2)

where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, and P2, V2, and T2 are the final pressure, volume, and temperature of the gas.

First, we need to adjust the initial volume of hydrogen to account for the presence of water vapor. The total pressure in the eudiometer is the sum of the pressure of the hydrogen gas and the pressure of the water vapor, which is equal to the partial pressure of water vapor in the air. The partial pressure of water vapor can be found using a vapor pressure table at the given temperature of 21°C, which is 18.7 mmHg.

Thus, the initial pressure of the hydrogen gas is equal to the total pressure minus the partial pressure of water vapor:

P1 = 735 mmHg - 18.7 mmHg = 716.3 mmHg

Now we can plug in the values into the combined gas law and solve for V2, the volume of the dry hydrogen gas at STP:

(P1 V1) / T1 = (P2 V2) / T2

where P2 = 1 atm (at STP) and T2 = 0°C = 273 K

V2 = (P1 V1 T2) / (T1 P2)

V2 = (716.3 mmHg x 35.5 mL x 273 K) / (294 K x 760 mmHg)

V2 = 29.5 mL

Therefore, the volume of dry hydrogen gas at STP is 29.5 mL.

Answer:

Barium Sulfite

Explanation:

Barium Sulfite

The IUPAC name for BaSO₃ is barium sulfite.

"Ba" stands for barium, which is the chemical symbol for the element with atomic number 56. Barium is an alkaline earth metal and belongs to Group 2 of the periodic table.

"SO₃" stands for sulfite, which is a polyatomic ion composed of one sulfur atom (S) and three oxygen atoms (O). The chemical formula for the sulfite ion is SO₃²⁻. The sulfur atom in the sulfite ion has a +4 oxidation state.

When barium (Ba) reacts with the sulfite ion (SO₃²⁻), they combine to form barium sulfite (BaSO₃). The balanced chemical equation for the reaction is:

Ba²⁺ + SO₃²⁻ → BaSO₃

Barium sulfite is an ionic compound, where the Ba²⁺ ion and the SO₃²⁻ ion are held together by electrostatic attractions (ionic bonds). In its solid form, barium sulfite appears as a white crystalline powder.

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Explanation:

a.

P. When potassium reacts with hydrochloric acid, the salt produced is potassium chloride and sulphur-di-oxide gas is evolved after performing these.

Q.Addition of acid with metal gives salt and hydrogen gas. When dilute Hydrochloric acid is added to iron filings, so chloride & hydrogen gas is produced.

R. and if you talk about gold, gold do not react easily with HCL

b.

# in ascending order P -> Q -> R

c.

# I think its potassium chloride reaction.

hope this helps you

have a great day :)

The automobile can drive about 216.49 km on the mixed fuel if you are limited by your supply of 20.0 L of methanol.

The step by step solution is as follows :

Density of the fuel = 0.775 g/mL ; Density of methanol = 0.787 g/mL ; Density of gasoline = 0.703 g/mL.

The mixture contains 85% of methanol and 15% of gasoline by mass.

Mass of fuel in 20 L methanol = Volume of methanol × Density of fuel= 20 L × 0.775 g/mL = 15.5 g/mL

Mass of methanol in fuel = (85/100) × Mass of fuel= (85/100) × 20 L × 0.787 g/mL= 13.37 kg

Mass of gasoline in fuel = (15/100) × Mass of fuel = (15/100) × 20 L × 0.703 g/mL= 2.109 kg

Total mass = Mass of methanol + Mass of gasoline = 13.37 kg + 2.109 kg = 15.479 kg

Density of the fuel = 0.775 g/mL (given)

Volume of the fuel = Mass / Density = 15.479 kg / 0.775 g/mL = 19.97 L

Fuel efficiency = 25.5 miles per gallon

1 mile = 1.60934 kilometers

1 gallon = 3.78541 liters

Conversion factor = 1.60934 km / 3.78541 L ≈ 0.42514 km/L

Thus, the automobile can drive about 216.49 km on the mixed fuel if you are limited by your supply of 20.0 L of methanol.

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Answer:

Cassiterite is an ore of Sn.It is also called tinstone and has molecular formula of SnO

2 . It is heavy, metallic, hard tin dioxide that is the major ore of tin. It is colourless when pure, but brown or black when iron impurities are present.

Answer:

It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.

Explanation:

This reaction would be considered a single replacement reaction.

The chemical reaction involves the products and the reactants. The image is neither synthesis nor decomposition as the two products are formed from two reactants. Thus, option A is correct.

A chemical reaction includes the chemical interaction between the reactants to yield the products. In a synthesis reaction, two reactants interact to produce a different molecule or compound.

In a decomposition reaction, a reactant undergoes splitting to produce products and energy. But in the image two reactants produces two products that neither of the reaction shows.

This type of reaction is seen as the single replacement reaction where the more reactive element displaces the less reactive from the compound to form the new molecule.

Therefore, option a. Maya's picture represents a single replacement reaction but not a synthesis or decomposition reaction.

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Answer:

the dividend yield is 4%

Explanation:

The computation of the dividend yield is as follows:

Dividend yield = Dividend per share ÷ current share price per share

= ($0.20 × 4 quarters) ÷ $20

= $0.80 ÷ $0.20

= 4%

hence, the dividend yield is 4%

The same is determined by applying the above formula

Answer:

(1) Acid -------------------------------------> (G) When dissolved in water, its solution has a pH value less than 7. Acids are proton (H⁺ ion) donors.

(2) Alkali -----------------------------------> (E) The oxide, hydroxide, or carbonate of a metal that will react with an acid, forming a salt as one of the products (if a base dissolves in water it is called an alkali. Bases are proton (H⁺ ion) acceptors.

(3) Base ------------------------------------> (I) Its solution has a pH value of more than 7.

(4) Blast furnace ------------------------> (C) The huge reaction vessels used in industry to extract iron from its ore.

(5) Displacement reaction ----------> (R) A reaction in which a more reactive element takes the place of a less reactive element in one of its compounds or in solution.

(6) Mole -----------------------------------> (A) A very large number that is the amount of substance in the relative atomic or formula mass of a substance.

(7) Neutral -------------------------------> (J) A solution with a pH value of 7 which is neither acidic nor alkaline. Alternatively, something that carries no overall charge.

(8) Neutralization ----------------------> (F) The chemical reaction of an acid with a base in which a salt and water are formed. If the base is a carbonate of hydrogen carbonate, carbon dioxide is also produced in the reaction.

(9) Ore -------------------------------------> (P) Ore is rock which contains enough metal to make it economically worthwhile to extract the metal.

(10) Oxidation --------------------------> (B) A reaction where oxygen is added to a substance / or when electrons are lost from a substance.

(11) pH -------------------------------------> (O) A number which shows how strongly acidic or alkaline a solution is.

(12) Pipette ------------------------------> (N) A glass tube used to measure accurate volumes of liquids.

(13) Precipitate -------------------------> (K) An insoluble solid formed by a reaction taking place in solution.

(14) Reactant ---------------------------> (M) A substance we start with before a chemical reaction takes place.

(15) Reduction -------------------------> (S) A reaction in which oxygen is removed or electrons are gained.

(16) Salt ----------------------------------> (Q) A salt is a compound formed when some or all of the hydrogen in an acid is replaced by a metal.

(17) Strong acids ---------------------> (L) These acids completely ionize in solution and have a high concentration of H⁺ (aq) ions in solution.

(18) Universal indicator ------------> (H) A mixture of indicators that can change through a range of colors to show how strongly acidic or alkaline liquids and solutions are.

(19) Weak acids ---------------------->  (D) Acids that do not ionize completely in aqueous solutions.

Unburned carbon produced during the inefficient burning of coal is called soot. It is a black, powdery substance composed mainly of carbon particles that are not fully combusted during the combustion process.

When coal is burned inefficiently, incomplete combustion occurs, leading to the formation of unburned carbon. This unburned carbon, commonly known as soot or carbon black, is primarily composed of fine carbon particles. Soot is produced when the combustion conditions are insufficient to completely break down the carbon-based compounds present in coal into carbon dioxide (CO2). Instead, the carbon atoms bond together, forming black, powdery particles. These particles are released into the atmosphere as emissions and contribute to air pollution. Soot can have detrimental effects on human health and the environment and is a key component of particulate matter, a significant air pollutant.

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The wavelength of the light is approximately 500 nm. The energy of the photon of light is approximately 6.56 x 10-20 J.

Answer: Question 1:The formula relating wavelength, frequency, and the speed of light is given by:c = fλHere,λ = wavelength, f = frequency, c = speed of lightI. n the problem, frequency is given as 5.98 x 1014 s-1. Therefore, using the formula, the wavelength of light can be calculated as follows:λ = c/f= (3 x 108 m/s)/(5.98 x 1014 s-1)≈ 500 nm

Therefore, the wavelength of the light is approximately 500 nm.

Question 2:The formula relating energy and frequency of light is given by:E = hfwhereE = energy of photonh = Planck's constant = 6.626 x 10-34 J s (Joule seconds)f = frequency of lightIn the problem, the frequency of light is given as 9.89 x 1013 Hz. Therefore, using the formula, the energy of the photon of light can be calculated as follows:E = hf= (6.626 x 10-34 J s) x (9.89 x 1013 Hz)≈ 6.56 x 10-20 J

Therefore, the energy of the photon of light is approximately 6.56 x 10-20 J.

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Answer:

It improves the texture of the flour

Explanation:

Flour is supposed to have a very fine texture. Commercial flour is not expected to occur in lumps. Lumps reduce the utility of the flour.

Hence, to improve the texture of the commercial flour, it is thoroughly sifted to ensure that there are no large lumps in the flour.This is so important when producing cake flour where the achievement of fine texture is of utmost priority.

Answer:

1s22s22p63s23p5.

Explanation:

When we write the configuration we'll put all 17 electrons in orbitals around the nucleus of the Chlorine atom. In writing the electron configuration for Chlorine the first two electrons will go in the 1s orbital. ... Therefore the Chlorine electron configuration will be

Answer:

the uses of periodic table is we can classify the elements in different groups.I think.

Answer:

the list is endless so those are some of them but I am sure there are more.

Explanation:

everyone feel free to add

Answer:

The atomic mass or mass number of an element is the total number of protons and neutrons in the nucleus of the atom.

Explanation:

done

Answer:

mass number

nucleus of an atom

I love physic

The volume, in milliliters, of the krypton gas is 523ml.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as

                                    PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Mass = 10g

Pressure = 563 mm Hg

Temperature = 298 K

moles of Kr =mass / atomic mass

= 10 / 84

= 0.119 moles

PV = nRT

563 × V = 0.119 × 8.314 × 298

V = 0.523L = 523ml

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Answer: During succession, new species move into an area and colonize it.

Explanation: Ecological succession refers to the process of change in the composition and structure of an ecosystem over time. It occurs due to the interactions between the biotic (living) and abiotic (non-living) components of an environment. As succession progresses, new species gradually establish and thrive in the area, leading to a change in the species composition. This process can occur over a long period of time, ranging from decades to centuries, depending on various factors such as environmental conditions and the specific type of succession.

The most stable conformer of cis-cyclohexane-1 3-diol is when the hydroxyl groups are in the equatorial position.

In cis-cyclohexane-1 3-diol, there are two hydroxyl groups attached to the cyclohexane ring. The hydroxyl groups can either be on the same side of the ring (cis) or on opposite sides (trans). To determine the most stable conformer, we need to consider the interactions between the hydroxyl groups. This is because the axial position creates steric hindrance due to the larger groups being in close proximity. In the equatorial position, the hydroxyl groups are further apart from each other and experience less repulsion.

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