WORTH 100 POINTS
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Write a chemical equation from the following: " Hydrogen plus oxygen produces hydrogen peroxide. " Label the parts of the equation as reactants, products, element, and compound.
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11.29 grams of strontium-ninety had been gift withinside the unique rock pattern in 1933. Strontium- ninety decays to yttrium-ninety, which in flip decays to solid zirconium.

The isotopes of strontium and yttrium emit beta debris as they decay. The launch of radiation throughout this decay manner reasons situation approximately the protection of strontium and all different radioactive substances. Sr-ninety may be inhaled, however ingestion in meals and water is the best fitness situation. Once withinside the body, Sr-ninety acts like calcium and is effectively included into bones and teeth, wherein it may purpose cancers of the bone, bone marrow, and smooth tissues across the bone.

Strontium has a half-existence of 28.8 years. Therefore,

1989 - 1933 = 56years.

fifty six / 28.eight = 1.94 half-lives

Thus, the amount of the radioisotope closing will double for every half-existence elapsed. transferring backwards in time. Therefore, transferring backwards in time through 1.94 times half-lives, the amount closing will double through 1.94 times.

Thus, the quantity closing in 1933 is 3.0 × (1.ninety four)² = 11.29 grams.

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Explanation:

The freezing point depression is a colligative property. We have to find the mass of ethylene glycol that we have to add to 100.0 g of water to change its freezing point from 0.0 °C to -4.3 °C.

The freezing point depression for a solution can be calculated using the following equation:

ΔTf = kf * molality * i

Where ΔTf is the freezing point depression, kf is the freezing point depression constant (it depends on the solvent and for water is 1.86 °C/m), molality is the molality of the solution and i is the Van't Hoff factor.

The Van't Hoff factor represents the number of particles formed when that compound dissolves. In our case the solute is ethylene glycol, a covalent compound, so it won't form ions when dissolved in the water. Then i is equal to 1.

The temperature must change from 0.0 °C to -4.3 °C, then the freezing point depression is 4.3 °C. So we know that:

i = 1 kf = 1.86 °C/m ΔTf = 4.3 °C

We can replace those values in the formula and find the molality of the solution.

ΔTf = kf * molality * i

4.3 °C = 1.86 °C/m * molality * 1

molality = 4.3 °C/(1.86 °C/m)

molality = 2.31 m

Now we can get the moles of ethylene glycol from the definition of the molal concentration. Molality are the moles of solute per kg of solvent. The mass of water is 100 g.

mass of solvent = 100.0 g * 1 kg/(1000 g)

mass of solvent = 0.100 kg

molality = moles of solute/(mass of solvent in kg)

moles of solute = molality * mass of solvent in kg

moles of solute = 2.31 m * 0.100 kg

moles of solute = 0.231 moles

And finally we can convert the moles of ethylene glycol to grams using its molar mass.

molar mass of C₂H₆O₂ = 62.07 g/mol

mass of C₂H₆O₂ = 0.231 moles * 62.07 g/mol

mass of C₂H₆O₂ = 14.4 g

Answer: 14.4 g of ethylene glycol must be mixed.

To determine the tomato's velocity when it hits the ground, we need more information. Specifically, we need the height from which the tomato was dropped and the tomato mass.

Without these details, it is impossible to calculate velocity accurately. The velocity of an object when it hits the ground depends on factors such as the height of the fall, the mass of the object, and any forces acting on it during the fall (such as air resistance).

If you can provide the necessary information, I can help you calculate the velocity of the tomato when it hits the ground.

The balancing of chemical equations is based on the law of conservation of mass.

How could a chemical process be made to balance out? Which integers can be changed, and which cannot?

When an equation is balanced, the coefficients can only be changed (the numbers in front of molecules or atoms).

The coefficients are indicated by the numerals in front of the molecule. Subscripts are the smaller numerals found following atoms. These cannot be changed while balancing chemical equations!

How is a chemical equation brought to equilibrium?

the algebraic balancing technique. Chemical equations can be balanced by assigning algebraic variables as stoichiometric coefficients to each species in the unbalanced chemical equation.

Equations in mathematics are used to calculate the values of each of these variables

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Answer: a

Explanation:

Industry uses only about 18% while the others use around 70-90% of water.

YW!!! please mark branlest!!!! =^.^=

The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.

To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.

The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the pressure is 1 atm, and the temperature is 273.15 K.

From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.

Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.

Therefore, the volume of I2 gas formed is 21 L.

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Answer:No

Explanation

Answer:

To investigate the presence of lithium ions and carbonate ions in the tablet, the following steps can be taken:

Materials needed:

Lithium carbonate tablet

Metal wire

Dilute hydrochloric acid

Limewater

Bunsen burner

Test tubes

Procedure:

Take a small piece of the lithium carbonate tablet and place it on a metal wire.

Hold the wire over a Bunsen burner flame until the sample turns red.

Allow the sample to cool and place it in a test tube.

Add dilute hydrochloric acid to the test tube and observe any gas that is produced.

Pass the gas produced through limewater in a separate test tube and observe if there is any change in the color of the limewater.

Results:

If a red flame is observed in step 2, it indicates the presence of lithium ions in the sample.

If gas is produced in step 4, it indicates the presence of carbonate ions in the sample.

If the limewater turns cloudy or milky in step 5, it indicates the presence of carbonate ions in the sample.

Therefore, the student can conclude that the lithium carbonate tablet contains lithium ions and carbonate ions.

Answer:

1,2,3

Explanation:

Heat gain implies that heat is absorbed by the system in order to make the stated phase transition possible.

Before a liquid changes to gas, intermolecular forces in the liquid are broken by energy supplied as heat.

Also, transition from solid to liquid requires energy to break intermolecular bonds.

Finally, sublimation requires input of energy in the form of heat.

Answer:

1 2 and 3

Explanation:

took the test

Answer:

72.3 c

Explanation:the celcuis would over power the fairnheight

Answer:evaluations of seismic data

Explanation:

Answer:

SI-28

Explanation:

Answer:

i think the answer is A....

Explanation:

Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.

Answer:

35 1/2 hours

Explanation:

61 x 7 = 427, 427 x 5 = 2135

2135 / 60 = 35.58333333333333333

Answer:

2 moles of C and no more

Explanation:

Consider the following reaction: 2A + 3B --> 2C If you have 2 moles of A and 6 moles of B, what is the maximum number of moles of C that can be made by the reaction

2A + 3B --> 2C '

2 of A make 2 of C if we have atleast 3 of B.

we ave more than enough B

2 of A will make 2 moles of C and no more

1. The name of the compound is 2-ethyl-1-butene

2. The name of the compouund is 1-chloro-1-propene

3. The name of the compouund is trans-2,3-dibromo-2-pentene

The IUPAC name of the compound can be obtained by doing the following:

With the above information, the name of the compound is 2-ethyl-1-butene

The IUPAC name of the compound can be obtained by doing the following:

With the above information, the name of the compound is 1-chloro-1-propene

The IUPAC name of the compound can be obtained by doing the following:

With the above information, the name of the compound is trans-2,3-dibromo-2-pentene

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The Voltage is the pressure from the electrical circuit of the power source that passes the current.

The Voltage is defined as the pressure from the electrical circuit of the power source that will passes the charged electrons that is the current through the conducting loop, it will enable them to do work  because of the illuminating the light. The in simple terms is : voltage = pressure, and it is denoted as the volts and the symbol is the V.

The voltage is described as the force that causes the flow of the charged particles. The Voltage is also called as the electromotive force.

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if 13.0 g of nitrogen and 2.00 g of hydrogen are reacted, and all the hydrogen is consumed, 3.73 grams of nitrogen would remain.

Nitrogen is a chemical element with the symbol N and atomic number 7. It is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard temperature and pressure. Nitrogen is the most abundant gas in Earth's atmosphere, making up about 78% of the air we breathe.

Nitrogen is an essential element for life as it is a major component of proteins and nucleic acids (DNA and RNA). It is also a component of many important compounds such as ammonia, nitric acid, and nitrogen oxide. Nitrogen is obtained from the air by a process called fractional distillation or by reacting ammonia with water.

In industry, nitrogen is used in the production of fertilizers, food packaging, and electronics. It is also used to create a controlled atmosphere for welding and in the manufacture of semiconductors.

Although nitrogen is not toxic, it can be dangerous if it displaces oxygen in confined spaces, leading to asphyxiation. Nitrogen gas can also react explosively with other chemicals under certain conditions.

Overall, nitrogen is a crucial element for life and industry with many useful applications, but it must be handled with care and caution to prevent accidents.

The balanced chemical equation for the reaction between nitrogen gas (N2) and hydrogen gas (H2) to form ammonia gas (NH3) is:

N2(g) + 3H2(g) → 2NH3(g)

This equation shows that 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3.

To determine the mass of nitrogen that would remain if all the hydrogen were consumed, we need to calculate which reactant is limiting, i.e. which reactant would be completely consumed in the reaction.

First, we calculate the number of moles of nitrogen and hydrogen:

Number of moles of N2 = mass of N2 / molar mass of N2

= 13.0 g / 28.02 g/mol

= 0.464 mol

Number of moles of H2 = mass of H2 / molar mass of H2

= 2.00 g / 2.02 g/mol

= 0.992 mol

According to the balanced equation, the stoichiometric ratio of N2 to H2 is 1:3. Therefore, 0.464 mol of N2 requires 1.392 mol of H2 to react completely. Since we only have 0.992 mol of H2, this is the limiting reactant.

Using the stoichiometric ratio, we can calculate the amount of N2 that would react with 0.992 mol of H2:

Number of moles of N2 consumed = 0.992 mol H2 x (1 mol N2 / 3 mol H2)

= 0.331 mol N2

The amount of N2 remaining after the reaction is the initial amount minus the amount consumed:

Number of moles of N2 remaining = 0.464 mol - 0.331 mol

= 0.133 mol

Finally, we can calculate the mass of N2 remaining:

Mass of N2 remaining = number of moles of N2 remaining x molar mass of N2

= 0.133 mol x 28.02 g/mol

= 3.73 g

Therefore, if 13.0 g of nitrogen and 2.00 g of hydrogen are reacted, and all the hydrogen is consumed, 3.73 grams of nitrogen would remain.

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Converting the units of a measurement is an essential skill that everyone should have. In our daily life, there are numerous situations where we might need to convert the units of measurement. One of the common examples can be when baking. To get the desired outcome, it is crucial to have the right amount of ingredients.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

Therefore the theoretical density of iron is 7.877 g/cm³ .

Therefore the number of vacancy per cm³ is

Explanation:

D. The name for the set of independent and dependent variables that will be controlled by the scientist.

The statement, that describes the ‘control’ in an experiment is "the name for the set of independent and dependent variables that will be controlled by the scientist."

A control is an element in an experiment that remains intact or unaffected by other variables. An experiment or observation aiming to minimise the influence of variables other than the independent variable is referred to as a scientific control. It serves as a standard or point of reference against which other test findings are measured.

In a scientific experiment, an independent variable is the variable that is modified or manipulated in order to assess the effects on the dependent variable. In a scientific experiment, the dependent variable is the variable that is being tested and measured. The designation given to the set of independent and dependent variables that the scientist will regulate.

Hence the correct option is D.

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If the partial pressure of hydrogen in the mixture is 75 torr, the total pressure of the mixture is 100 torr.

Partial pressure is the notional pressure present in every gas.

Given,

The mole fraction of helium is 0.750.

The partial pressure of hydrogen in the mixture is 75 torr

The mole fraction of hydrogen is

To find the total pressure

By Roult's law

Partial pressures divided by mole fraction

75 / 0.750 = 100 torr

Thus, the correct option is a, 100 torr.

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Answer:

Atomic element

Explanation:

Carbon is considered an atomic element. Therefore, the correct option is option A among all the given options.

Chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons may be used to create covalent chemical connections. It is nonmetallic. The periodic table's group 14 includes it. The crust of the Earth contains 0.025 percent carbon. There are several ways in which the carbon atoms can connect, giving rise to different allotropes of carbon. Amorphous carbon, diamond, graphite, and fullerenes are examples of well-known allotropes. Carbon is considered an atomic element.

Therefore, the correct option is option A among all the given options.

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Answer:

True

Explanation:

More the concentration of H⁺ ions than OH⁻ions the pH value will be less than 7. Therefore, the given statement is false.

The pH of a solution can be described as the negative logarithm of hydrogen (H⁺) ion concentration. pH is mathematically inversely proportional to the concentration of hydrogen ions.

pH = - log ([H⁺])

In chemistry, pH is used to determine the acidity or basic strength of an aqueous solution. Acidic solutions are determined to have lower pH values than alkaline solutions.

The pH scale exhibits a range from 0 to 14 while pH 7.0 is neutral. A low pH value is acidic while a high pH means basic.

If the concentration of  H⁺ ions than that of OH⁻ ions then the pH value of the solution will decrease and a low pH value of 7 indicates that the solution is acidic.

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Runoff includes; rivers, streams, creeks, and lakes.

Runoff refers to water that flows on the surface of the ground. Run off usually occurs after a heavy storm and may be responsible for some cases of flooding.

Runoff flows into water bodies such as rivers, streams, creeks, and lakes. These are water bodies that receives runoff water.

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Answer: all of these

The mass (in grams) of chlorine gas is needed to react with 251 grams of iron is 479 grams. Option C.

To determine the mass of chlorine gas needed to react with 251 grams of iron, we need to use the stoichiometry of the balanced chemical equation:

2Fe + 3Cl2 → 2FeCl3

From the balanced equation, we can see that 2 moles of iron (Fe) react with 3 moles of chlorine gas (Cl2) to produce 2 moles of iron(III) chloride (FeCl3).

To calculate the mass of chlorine gas, we can follow these steps:

Step 1: Convert the given mass of iron (Fe) to moles.

Using the molar mass of iron (Fe), which is approximately 55.85 g/mol, we can calculate the number of moles of iron:

moles of Fe = mass of Fe / molar mass of Fe

moles of Fe = 251 g / 55.85 g/mol

moles of Fe ≈ 4.5 mol (rounded to one decimal place)

Step 2: Use the mole ratio from the balanced equation to find the moles of chlorine gas (Cl2) needed.

From the balanced equation, we know that 2 moles of Fe react with 3 moles of Cl2. Therefore, the moles of Cl2 can be calculated as:

moles of Cl2 = (moles of Fe / 2) * 3

moles of Cl2 = (4.5 mol / 2) * 3

moles of Cl2 ≈ 6.75 mol (rounded to two decimal places)

Step 3: Convert the moles of chlorine gas to grams.

Using the molar mass of chlorine gas (Cl2), which is approximately 70.90 g/mol, we can calculate the mass of chlorine gas:

mass of Cl2 = moles of Cl2 * molar mass of Cl2

mass of Cl2 = 6.75 mol * 70.90 g/mol

mass of Cl2 ≈ 479 grams (rounded to the nearest whole number) Option C is correct.

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