a lead-tin alloy of composition 30 wt% sn-70 wt% pb is slowly heated from a temperature of 1500c(3000f). what is the composition first liquid form?

The volume of steam that could be produced at STP if 12.8 g of oxygen reacts with excess hydrogen is 17.92 L

We'll begin by obtaining the mole of steam produced. This can be obtained as follow:

2H₂ + O₂ -> 2H₂O

From the balanced equation above,

1 mole O₂ reacted to produce 2 moles of steam, H₂O

Therefore,

0.4 mole O₂ will react to produce = 0.4 × 2 = 0.8 mole of steam, H₂O

Finally, we shall determin the volume as follow:

At standard temperature and pressure (STP),

1 mole of H₂O = 22.4 L

Therefore,

0.8 moles of H₂O = (0.8 mole × 22.4 L) / 1 mole

0.8 moles of H₂O = 17.92 L

Thus, we can conclude that the volume produced is 17.92 L

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Answer:

D. Zn²⁺ + 2Ag → Zn + 2Ag⁺

Explanation:

On the reduction potential chart, we have that silver ion Ag⁺ is a stronger oxidizing agent than, zinc, Zn, which is a reducing reducing agent the compared to silver

Therefore, the redox reaction that will occur is that the zinc, Zn, will be oxidized to Zn²⁺ ion, while the silver, Ag²⁺ ion will be reduced to silver deposits Ag, therefore, the zinc will displace the silver in the solution containing silver and zinc ions because zinc is higher than silver in the reactivity series

The reduction potential Zn → Zn²⁺ + 2e⁻ = +0.76

The reduction potential for Ag⁺ + e⁻ → Ag = +0.8

Therefore, given that redox reactions are reversible, we get the following likely redux reaction;

Zn(s) + 2Ag⁺(aq) ⇄ 2Ag(s) + Zn²⁺(aq)

Therefore, from the given options;

Zn²⁺(aq) + 2Ag(s) → Zn(s) + 2Ag⁺(aq) is the reaction most likely to occur.

The energy required to increase 1.000 kg of water ice between 0 °C °C through 79.8 °C °C is equivalent to the energy required to melt one pound of ice (334 kJ).

No surface temp change happens from heat exchange if ice caps melt and has become water ice (i.e., that during phase transition). Imagine about water melting from stalactites that were already dripping on a sun-warmed roof. Alternatively, water boils in an ice bucket cooled by relatively low surroundings.

To melt, the iceberg will take in all the heat that is available. The water stays at zero degrees Fahrenheit until all of the ice has dissolved as when the ice has melted, it changes becomes saltwater at that temperature.

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ANSWER

Water molecule is a compound

EXPLANATION;

Water molecule is formed from the combination of oxygen and hydrogen atoms

Recall, that compound is the combination of two or more elements that are chemically combined together

Therefore, water molecule is a compound

When a neutron is fired into one of 100 atoms of uranium-235, it can cause a chain reaction.

Uranium-235 is an isotope of uranium that is fissile, meaning it can undergo nuclear fission. When a neutron collides with a uranium-235 nucleus, it causes the nucleus to become unstable and break apart into two smaller nuclei and several additional neutrons. These additional neutrons then go on to collide with other uranium-235 nuclei, causing them to undergo fission as well, releasing more neutrons in the processThis process of neutron-induced fission can continue, releasing large amounts of energy in the form of heat and light, as well as radiation. The chain reaction can be controlled or made to stop by adding or removing neutrons from the system, making the neutron to nucleus collision less likely to occur.In a nuclear power plant, the chain reaction is controlled and the heat generated by the fission reactions is used to produce steam, which drives turbines to generate electricity. In a nuclear weapon, the chain reaction is uncontrolled, resulting in a much larger release of energy in a much shorter period of time.

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Mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron.

The chemical element iron has the atomic number 26 and the symbol Fe. It is a metal that is found in group 8 of a periodic table and the first transition series. It makes up a large portion of the planet's outer or inner core and is the most prevalent element on Earth by mass, just ahead of oxygen.

It is the fourth most prevalent element in the crust of the Earth, having been mostly deposited by meteorites inside its metallic state, along with its ores. Iron ores must be processed in kilns or furnaces that may reach 5000 °C (2,730 °F) and higher, which is approximately 500 °C (932 °F) greater than the temperature needed to smelt copper. Mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron.

Therefore, mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron.

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Answer:

sorry we don't know the answer.

Answer:

12

Explanation:

there are 12 because of the desnity

Answer:

Its 1500 meters, which is equal to 0.9320568 miles. Hope this helps!

Explanation:

A carbon-hydrogen bond in ethane (CH3CH3) is best described essentially nonpolar. Option B is correct.

A nonpolar bond is one in which electrons are shared equally between atoms.In Ethane, the carbon atom has four valence electrons, while the hydrogen atom has one valence electron. The carbon atom forms four covalent bonds to the hydrogen atoms. Since the hydrogen atoms are equivalent, all of the carbon-hydrogen bonds are identical.

Each of the carbon-hydrogen bonds has a bond distance of 109.5°.Ethane is a hydrocarbon with the formula C2H6. It is an alkane with two carbon atoms. It's also known as a saturated hydrocarbon because all of its carbon atoms are bonded to as many hydrogen atoms as possible. Because of this, it contains only single bonds between atoms.Each carbon in ethane is surrounded by four other atoms and has a tetrahedral geometry.

Since the electronegativity of carbon and hydrogen atoms is quite close, the carbon-hydrogen bonds in ethane are nonpolar and symmetric. Because the electronegativity values of carbon and hydrogen are close, there is no significant polarity between the carbon-hydrogen bonds. Therefore, the carbon-hydrogen bond in ethane is best described as essentially nonpolar.

Therefore, Option B is correct.

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Answer:

Single displacement (Substitution)

Explanation:

Answer:

There are light absorbing color bodies called chromophores that are present in dyes. Ultraviolet rays are one of the causes of fading because they can break down chemical bonds and fade the color in objects.

The percentage yield is equal to 200.6%.

The balanced equation for the given chemical reaction is :

2C2H + 5O2 → 4CO2 + 2H2O

Let's find the limiting reagent:

Mass of C2H = 120 g

Mass of O2 = 288 g

Molar mass of C2H = 26 g/mol

Molar mass of O2 = 32 g/mol

The number of moles of C2H is equal to:

120 g × 1 mol/26 g = 4.62 mol

The number of moles of O2 is equal to:

288 g × 1 mol/32 g = 9 mol

According to the stoichiometry of the balanced equation, 2 moles of C2H react with 5 moles of O2, so:

If 4.62 moles of C2H is used, then the required amount of O2 would be:

5/2 × 4.62 mol = 11.6 mol

We only have 9 mol of O2 which means it is the limiting reagent.

C2H is the excess reagent.

Let's find the mass of water produced:

According to the stoichiometry of the balanced equation,2 moles of H2O is produced per 2 moles of C2H2 moles of H2O is produced per 5 moles of O2If 9 mol of O2 is used, the number of moles of water produced would be:

2/5 × 9 mol = 3.6 mol

The mass of water produced is equal to:

3.6 mol × 18 g/mol = 64.8 g

Therefore, 64.8 g of water can be produced.

The amount of excess reagent is equal to:

4.62 mol - 2/2 × 9 mol = 4.62 - 9

= -4.38 mol

C2H is the excess reagent and it is not possible to have negative amount of a substance.

So, we assume that there is no excess reagent.

If 130 grams of water is produced, then the percentage yield is equal to:

Percent yield = actual yield/theoretical yield × 100

Theoretical yield is equal to 64.8 g

Actual yield is equal to 130 g

Percent yield = 130/64.8 × 100

= 200.6%

Therefore, the percentage yield is equal to 200.6%.

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The standard enthalpy change of the explosive reaction is -11408 kJ/mol.

The standard enthalpy change of the reaction can be calculated using the enthalpy of formation values of the reactants and products.

The enthalpy of the formation of ammonium nitrate (NH4NO3) is -393.5 kJ/mol, the enthalpy of the formation of the fuel oil (C10H22) is -249.7 kJ/mol, the enthalpy of the formation of oxygen (O2) is 0 kJ/mol.

The enthalpy of the formation of nitrogen (N2) is 0 kJ/mol, the enthalpy of the formation of water (H2O) is -285.8 kJ/mol, and the enthalpy of the formation of carbon dioxide (CO2) is -393.5 kJ/mol.

The equation for the explosive reaction is 3NH4NO3(s)+C10H22(l)+14O2(g)>3N2(g)+17H2O(g)+10CO2(g). Therefore, the standard enthalpy change of the reaction can be calculated using the following equation:

ΔH = [3(-393.5) + (-249.7) + (14*0) + (3*0) + (17*-285.8) + (10*-393.5)] - [3(-393.5) + (-249.7) + (14*0)]

ΔH = -11408 kJ/mol.

Therefore, the standard enthalpy change of the explosive reaction is -11408 kJ/mol.

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The complete question is attached below.

Protease is considered a proteolytic enzyme, which breaks down proteins into their amino acids by hydrolysis.

An enzyme is defined as the biological protein which is used to speed up biochemical reactions in the body cells.

There are various types of enzymes and they include the following:

The protease is an example of proteolytic enzyme that helps in the break down of protein molecules into smaller molecules called amino acids by a chemical process called hydrolysis.

Hydrolysis is defined as the chemical reaction whereby water reacts with a substance to lead to its decomposition.

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The degree of unsaturation for the molecule with the molecular formula C₈H₉N is 5.

The degree of unsaturation, also known as the index of hydrogen deficiency (IHD), is a measure of the total number of rings and/or pi bonds in a molecule. It can be calculated using the following formula:

IHD = (2 + 2C - H + N - X)/2

Where:

For the given molecular formula C₈H₉N, we have:

C = 8

H = 9

N = 1

X = 0 (no halogens)

Plugging these values into the formula, we get:

IHD = (2 + 2(8) - 9 + 1 - 0)/2

IHD = (2 + 16 - 9 + 1)/2

IHD = 10/2

IHD = 5

Therefore, the degree of unsaturation for the molecule with the molecular formula C₈H₉N is 5.

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By using the ionic bonding model, the highest melting point has MgO, due to presence to more ionic charge than NaCl.

Ions having opposing charges electrostatically attract one another to form ionic bonds, sometimes referred to as electrovalent bonds, in a chemical molecule. When the valence (outermost) electrons of one atom are irreversibly transferred to another atom, a bond of this sort is created. If an atom receives electrons, it becomes a negatively charged ion (cation), and if it loses electrons, it becomes a positively charged ion (cation) (anion). Following is a quick discussion on ionic bonds. For further information, go visit Chemical Bonding: The Ionic Bonding Process. The greatest examples of this kind of chemical are those that result from the combination of nonmetals with alkali and alkaline-earth metals. Ionic bonding results in the formation of electrovalent or ionic molecules. genuine polar covalent bond

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Taking into account the definition of pH and pOH, the concentration of an aqueous solution of Ca(Oh)₂ is 3.16×10⁻³ M.

H is a unit of acidity or alkalinity that represents the concentration of hydrogen ions in a solution or other substance. It is defined as the negative base 10 logarithm of the activity of hydrogen ions. or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similar to pOH, which measures the amount of hydroxyl ions in a solution and is given as the logarithm of its concentration, OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

Thus, it is possible to construct the following relationship between pH and pOH:

pOH + pH= 14

You are aware that the pH in this instance is 10.66 for an aqueous solution of Ca(Oh)₂. pOH is then calculated as follows: pOH + 10.66= 14.

Calculating pOH=14 – 10.66

pOH= 3.34

In the pOH definition, this value should be changed to:

3.34= - log [OH⁻]

Solving:

[OH⁻]= 10⁻² ⁵⁰

[OH⁻]= 3.16×10⁻³ M

A strong base is one whose concentration is equal to that of the cation and OH- and which entirely dissociates into the cation or OH- in an aqueous solution. The[CaOH] = [OH-]

Finally, the concentration of an aqueous solution of CaOH is 3.16×10⁻³ M.

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The observed rotation of a racemic mixture is 0º because the two enantiomers rotate plane-polarized light to an equal extent but in opposite directions, so the rotations cancel.

Racemic mixtures are a type of mixture that consists of equal amounts of two enantiomers of a chiral molecule. Enantiomers are mirror images of each other and are not superimposable. Racemic mixtures are optically inactive, which means they do not interact with plane-polarized light.

Racemic mixtures are often used in pharmaceuticals and can help determine the relative potency of the two enantiomers. Racemic mixtures can also be used to create new compounds that are not possible with a single enantiomer.

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Answer:$$7.50 x 10^23$$

$$H_2SO_4$$?

Explanation:It is a fact that such a quantity has a mass of  

98.08

⋅

g

. Why? Because  

6.022

×

10

23

particles SPECIFIES a molar quantity. And we know (or can calculate) that sulfuric acid has a molar mass of  

98.08

⋅

g

...  

Answer:

A. 2

Explanation:

You need to balance the other side so the reactants and products are equal.

Answer:

I hope this helps

Explanation:

The thing that will happen to the temperature if you use 75 ml of HCl and 75 ml of NaOH instead is that it increases as more heat is released.

A neutralization occurs when NaOH and HCl are combined. Each chemical reaction has a unique heat of reaction, which is the heat exchanged during the process.

The reaction in issue is exothermic (emits heat), and the amount of heat emitted relies on the chemicals used, their concentrations, and the working temperature (it is produced at a low temperature).

The fluctuation in temperature and the mass used determine how much heat is allocated.

In this case, the thing that will happen to the temperature if you use 75 ml of HCl and 75 ml of NaOH instead is that it increases as more heat is released.

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ANSWER

The mass of water is 0.0536 kg

STEP-BY-STEP EXPLANATION;

Given information

The mass of KNO3 = 175g

The molarity of the solution = 32.25 M

The molality formula is given below as

The first step is to find the mole of the solute using the below formula

Recall, the molar mass of KNO3 is 101.1032 g/mol

The second step is to find the mass of water using the molality formula

Hence, the mass of water is 0.0536 kg

Here's the electron descriptions for the elements upto neon in their ground state :

Hydrogen : \(1s^{1}\)

Helium : \(1s^{2}\)

Lithium :  \(1s^{2} 2s^{1}\)

Beryllium : \(1s^{2} 2s^{2}\)

Boron : \(1s^{2} 2s^{2} 2p^{1}\)

Carbon : \(1s^{2} 2s^{2} 2p^{2}\)

Nitrogen : \(1s^{2} 2s^{2} 2p^{3}\)

Oxygen : \(1s^{2} 2s^{2} 2p^{4}\)

Fluorine : \(1s^{2} 2s^{2} 2p^{5}\)

Neon : \(1s^{2} 2s^{2} 2p^{6}\)

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The ratios which are needed to determine the mass of oxygen produced from the decomposition of 10 grams of potassium chlorate are;

From stoichiometry;

3 moles of oxygen requires 2 moles of KClO3 to be produced.

And from molar mass analysis;

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Answer:

its

Explanation:

3 mole 02

over 2 mole kcio

32.00 g 02

1 mole 02

all the other answwr are wrong

Answer:

To convert m/sec into mi/hr, multiply the number by 2.236936 and then round off the answer to the required decimal places.

2500 ×2.236936

= 5592.34 mi/hr