Nick is researching why baking powder is a common baking ingredient. He learns that baking powder contains tartaric acid and sodium hydrogen carbonate. He also learns that when water is added to cake ingredients, a reaction occurs. It causes bubbles to form that make the cake rise. What gas is in the bubbles, and why do they form?

Answer:

2.29 M

Explanation:

Equation of the reaction;

Ca(OH)2(aq) + 2HClO4(aq) → 2H2O(l) + Ca(ClO4)2(aq)

Concentration of acid CA = 1.49 M

Concentration of base CB= ????

Volume of acid VA= 43.0 ml

Volume of base VB= 14.0 ml

Number of moles of acid NA = 2 moles

Number of moles of base NB = 1 mole

CAVA/CBVB = NA/NB

CAVANB =CBVBNA

CB= CAVANB/VBNA

CB= 1.49 × 43.0 × 1/14.0 × 2

CB= 2.29 M

A total of 1.5 moles of ammonia (NH₃) could be produced.

To react with 56.0 g of N₂, 6.000 moles of H₂ gas are required.

A. We need to balance the chemical equation first:

N₂ + 3H₂ → 2NH₃

From the balanced equation, we can see that 1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃.

Therefore, if 0.75 moles of N₂ are reacted with enough hydrogen gas, we can calculate the moles of NH₃ produced using the mole ratio:

0.75 moles N₂ × (2 moles NH₃ / 1 mole N₂) = 1.5 moles NH₃

Therefore, 1.5 moles of NH₃ can be produced.

B. We can use the molar mass of N₂ to convert 56.0 g of N₂ to moles:

56.0 g N₂ × (1 mole N₂ / 28.02 g) = 2.000 mole N₂

From the balanced equation, we know that 1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃.

Therefore, the moles of H₂ required can be calculated using the mole ratio:

2.000 mole N₂ × (3 mole H₂ / 1 mole N₂) = 6.000 mole H₂

Therefore, 6.000 moles of H₂ are needed to react with 56.0 g of N₂.

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Considering the definition of percentage by mass and molality, the molality of Na₃PO₄ in the solution is 0.948 \(\frac{moles}{kg}\).

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

\(percentage by mass=\frac{mass of solute}{mass of solution}x100\)

Molality is the ratio of the number of moles of any dissolved solute to kilograms of solvent.

The Molality of a solution is determined by the expression:

\(molality=\frac{number of moles of solute}{kilograms of solvent}\)

Considering 100 grams as a sample of the solution, then the value of the percentage of concentration given indicates that  13.5 g correspond to Na₃PO₄.

Remember that percent concentration by mass is calculated using the mass of solute and the mass of the solution, which includes both the solute and the solvent. Then:

mass solution= mass solute + mass solvent

100 g= 13.5 g + mass solvent

100 g - 13.5 g= mass solvent

86.5 g= mass solvent

Then, you know:

Then, replacing in the definition of molality:

\(molality=\frac{0.082 moles}{0.0865 kg}\)

Solving:

molality= 0.948 \(\frac{moles}{kg}\)

Finally, the molality of Na₃PO₄ in the solution is 0.948 \(\frac{moles}{kg}\).

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13.5 x \(10^-2\) g of aluminium will be produced if 1.0 g of Ba reacts with 1.80 g of \(Al_2(SO_4)3\).

The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilograms of carbon 12; its symbol is “mol”.

Balanced Equation:

\(3Ba + Al_2(SO_4)_3\) → \(2Al+3BaSO_4\)

Grams of Ba: 1.0 g

Grams of \(Al_2(SO_4)_3\): 1.8g

Calculate the moles of Ba and \(Al_2(SO_4)_3\):

\(\frac{1g Ba}{137.3}\) = 7.3 x\(10^{-3}\)mol

1.8g \(Al_2(SO_4)_3\)/ 342 = 5.3 x \(10^-3\) mol \(Al_2(SO_4)_3\)

Find the limiting reactant:

Ba has a coefficient of 3 in the balanced equation, so we divide the  moles of Ba by 3 to get  7.3 x \(10^-3\) mol Ba ÷3 = 2.43 x \(10^-3\)

\(Al_2(SO_4)_3\) has a coefficient of 1, so if we divide by 1, we get the same number of 5.3 x\(10^-3\)

2.43 x \(10^-3\) is smaller than 5.3 x \(10^-3\), therefore Ba is the limiting reactant.

finally, we just find the number of moles of Al

The ratio of Al to Ba is 2:3

7.3 x \(10^-3\) x (2÷3) = 5 x \(10^-3\) mol Al

Convert into mass.

5 x \(10^-3\) mol Al  x 27 = 13.5 x \(10^-2\) g

Hence, 13.5 x \(10^-2\) g of aluminium will be produced if 1.0 g of Ba reacts with 1.80 g of \(Al_2(SO_4)3\).

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Answer:

volume=0.04322m3

Explanation:

acording to ideal gas equation that PV=nRT

We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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Answer:

D.

Explanation:

Answer:

See figure 1

Explanation:

For this question, we can start with the structure of pyruvic acid. In this molecule, we have two functional groups, the ketone group, and a carboxylic acid group.

In the acid group, we have an acidic hydrogen. That is, this hydrogen can leave the molecule to produce a hydronium ion (\(H^+\)).

Now, to know what is the pH at which this hydrogen leaves the molecule we must look for the pKa value. Which for the case of this molecule is 2.45

If there is a pH value greater than 2.45, the molecule will lose hydrogen. In this case, we will have a value above 2.45 (7.4), which is why the conjugated acid of pyruvic acid will be produced, which is pyruvate.

Therefore, in the structure, we will have a negative charge on the acid group.

See figure 1

I hope it helps!

Answer:

D

Explanation:

A buffer solution contains (1)a weak base and its salt, or (2) a weak acid and its salt.

So, the combination of the weak acid CH3COOH and its salt CH3COONa will make a buffer.

Answer:

D. CH3COOH and CH3COONa

Explanation:

A buffer is made of:

- a weak acid + its conjugate base

- a weak base + its conjugate acid

A. NaOH is a strong base

B. KOH is a strong base

C. HCl is a strong acid

Answer:

1577 °C

Explanation:

Step 1: Calculate the volume of the cylinder

The diameter of the base (d) is 13.0 cm and the height (h) is 15.6 cm. We will use the following expression.

V = h × π × (d/2)²

V = 15.6 cm × π × (13.0 cm/2)² = 8.28 × 10³ cm³ = 8.28 × 10³ mL = 8.28 L

Step 2: Calculate the moles of BF₃

We have 0.0985 kg (98.5 g) of BF₃, whose molar mass is 67.81 g/mol.

98.5 g × 1 mol/67.81 g = 1.45 mol

Step 3: Convert 2.70 MPa to atm

We will use the conversion factor 1 MPa = 9.86923 atm.

2.70 MPa × 9.86923 atm/1 MPa = 26.6 atm

Step 4: Calculate the maximum safe operating temperature

We will use the ideal gas equation.

P × V = n × R × T

T = P × V / n × R

T = 26.6 atm × 8.28 L / 1.45 mol × (0.0821 atm.L/mol.K) = 1850 K

We can convert 1850 K to Celsius using the following expression.

°C = K - 273.15 = 1850 K - 273.15 = 1577 °C

The balanced chemical equation for the reaction is: H2SO4 + 2KOH → K2SO4 + 2H2O. It can be concluded that the basicity of tetraoxosulphate VI acid is 2.

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At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

The original pressure of a rigid container if the new pressure is 82.5atm and the new temperature was raised from 44°C to 67°C is 76.92 atm.

The pressure of a container can be calculated by using the following formula;

Pa/Ta = Pb/Tb

Where;

According to this question, the new pressure in a container is 82.5 atm and the new temperature was raised from 44°C to 67°C. The original pressure can be calculated as follows:

Pa/317 = 82.5/340

Pa = 317 × 0.243

Pa = 76.92 atm

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The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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The chemical D is  FeSO4 · 7H2O which is a green crystalline solid. When dissolved in water it gives a very pale green solution. The chemical E is Fe(OH)3 which is reddish brown in color. The chemical F is BaSO4 which is white in color.

D =  FeSO4 · 7H2O hydrated ferrous sulfate.

E = Fe(OH)3 ferric hydroxide

F= BaSO4  barium sulphate

A chemical response happens while one or extra chemical substances are modified into one or extra different chemicals. For Example iron and oxygen combine to make rust. vinegar and baking soda combine to make sodium acetate, carbon dioxide, and water. techniques concerning the atomic nucleus are called nuclear reactions. The substances that participate in a chemical reaction are known as reactants.

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Answer:

I cannot see what you are trying to show.

Explanation:

Answer:

Explanation:

D or b

Sorry if wrong

Answer:

temporal

Explanation:

Answer:

answers are: Sublimation of a solid, Solid melting, liquid freezing, and ice melting

Answer:

The half-life varies depending on the isotope.

Half-lives range from fractions of a second to billions of years.

The half-life of a particular isotope is constant.

Explanation:

Make sure you add the options

Answer:

C

Explanation:

The element gold has a consistent melting point and color regardless of the physical changes. This identifies gold as a pure substance. The correct option is C.

Pure substances are those that are made up of only one type of atom, and nothing is mixed in these substances. They are only one type of particle. They have fixed mass and structure.

Gold is an element that has an atomic number of 79. It is a bright yellow colored and shiny metal. It is used to make an ornament, which is made by mixing other metal to it.

Elements and compounds are subclasses of pure substances. A material that solely contains one type or class of atom is said to be an element. Gold is a pure substance, it is made by one type of atom which is Aurum (Au).

Thus, the correct potion is C. A pure substance.

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Answer:

n2 = 4

Explanation:

By using the Rydberg equation and

Since n1 = 1, we have:

\(2.176 \times 10^{-18} \times (1 - \frac{1}{n_{2}^{2}}) = 2.044\times 10^{-18} \\n_{2}^{2} = 4\)

therefore n2 is equal to 4

The final value of n in a hydrogen atom transition has been 2.

The Rydberg equation helps in the determination of the transition and the resulting wavelength.

The Rydberg equation for hydrogen atom transition can be given by:

\(\rm \dfrac{1}{\lambda}\) = Rydberg constant( \(\rm \dfrac{1}{first\;energy\;level}\;-\;\dfrac{1}{final\;energy\;level}\))

Energy = \(\rm \dfrac{1.2398}{\lambda}\)

2.044 \(\rm \times\;10^-^1^8\)  = \(\rm \dfrac{2.53\;\times\;10^-^1^8}{\lambda}\)

2.53 \(\rm \times\;10^-^1^8\) = 2.176 \(\rm \times\;10^-^1^8\) \(\rm (\dfrac{1}{(1)^2}\;-\;\dfrac{1}{(n_2)^2} )\)

n2 = 2

The final value of n in a hydrogen atom transition has been 2.

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Answer:

double decomposition reaction

Answer:

140. J/g*K

Explanation:

To find the specific heat capacity, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = energy/heat (J)

-----> m = mass (g)

-----> c = specific heat (J/mole*K)

-----> ΔT = change in temperature (K)

Before you can use the equation above, you need to (1) convert kg to grams, then (2) convert grams to moles (via molar mass), and then (3) convert Celsius to Kelvin. The final answer should have 3 significant figures.

1.11 kg C₄H₈O₂ x 1,000 = 1110 g

Molar Mass (C₄H₈O₂): 4(12.01 g/mol) + 8(1.008 g/mol) + 2(16.00 g/mol)

Molar Mass (C₄H₈O₂): 88.104 g/mol

1110 grams C₄H₈O₂                1 mole
------------------------------  x  -------------------------  =  12.6 moles C₄H₈O₂
                                           88.104 grams

34.5 °C + 273 = 307.5 K

52.3 °C + 273 = 325.3 K

Q = mcΔT                                                                   <----- Equation

3.14 x 10⁴ J = (12.6 moles)c(325.3 K - 307.5 K)         <----- Insert values

3.14 x 10⁴ J = (12.6 moles)c(17.8)                                <----- Subtract

3.14 x 10⁴ J = (224.28)c                                 <----- Multiply 12.6 and 17.8

140. = c                                                         <----- Divide both sides by 224.28

**this answer may be slightly off due to using different molar masses/Kelvin conversions**

Answer:

Explanation:

If a zero is found between significant digits, it is significant

The best way to sum up the cyclist's potential and kinetic energy is to say that as she progresses up the hill, her kinetic energy rises and her potential energy falls.

The object or system is unaffected by external factors like air pressure or altitude. On the other hand, kinetic energy refers to the force of moving particles within a system or an object.

Kinetic energy is the energy a thing has as a result of motion. A force must be applied to an object in order to accelerate it.We have to work hard in order to apply a force. Once the work is finished, energy is transferred to the item, at which point it moves at a new, constant speed.

Potential energy is the energy that an object or system has stored as a result of its placement or configuration. An object's kinetic energy is measured in relation to stationary and moving items in its immediate environment. Potential energy is independent of an object's surroundings.

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Answer:

Number of moles Magnesium (Mg) = 7.40 moles

Number of moles Chlorine (Cl) = 14.8 moles

Number of moles of oxygen atoms = 29.6 moles

7.40;14.8;29.6

Explanation:

Step 1: Data given

Number of moles of magnesium perchlorate, Mg(ClO4)2 = 7.40 moles

Step 2: Calculate number of moles

In 1 mol of magnesium perchlorate, Mg(ClO4)2, we have:

1 Mol Magnesium (Mg)

2 moles of Chlorine (Cl)

8 moles of oxygen (O)

This means that for 1 mol of magnesium perchlorate, Mg(ClO4)2, we have the same amount of moles Magnesium (Mg), the double amount of moles of Chlorine (Cl) and 4x the amount of moles of oxygen (O)

Number of moles Magnesium (Mg)= 1 * 7.40 moles = 7.40 moles

Number of moles Chlorine (Cl) = 2 * 7.40 moles = 14.8 moles

Number of moles of oxygen atoms = 4 * 7.40 moles = 29.6 moles

7.40;14.8;29.6

Answer:

See explanation and image attached

Explanation:

Here attached are resonance forms of pyrrole and pyridine. The images were obtained from quora and researchgate respectively.

Now, we can see that in the resonance forms of pyrrole, the nitrogen atom in the heterocycle has a formal charge of +1. However, in the six membered pyridine hetrocycle, the nitrogen atom may have a formal charge of -1 or +1 as shown in the canonical structures attached. The structures in which nitrogen has a +1 formal charge in pyridine are comparable to structures obtained from pyrrole. These structures have less contribution to the structure of pyridine.