How many grams of chlorine gas are needed to
react with 3.50 liters of a 1.70 molar potassium
bromide solution?
Cl2 + 2KBr — 2KCI + Br

Answer:

Elements.

Explanation:

Modern Chemistry says these are elements.

Answer:

elements

Explanation:

Answer:

all answers in image:

Explanation:

happy searching

The correct options are B, A, A, C and D.

The rate of reaction or reaction rate is the speed at which reactants are converted into products. When we talk about chemical reactions, it is a given fact that rate at which they occur varies by a great deal.

Some chemical reactions are nearly instantaneous, while others usually take some time to reach the final equilibrium.

Increasing the surface area of one or more reactants affect the reaction rate of a system will speed up the reaction.

increase the concentration of a reactant  will usually speed the reaction rate of a chemical system

Some metals found in a car’s exhaust system speed up a chemical reaction but are not used up and they act as catalysts.

A catalyst decreases the activation energy needed for a reaction.

The theory explains the increase in reaction rate caused by raising the temperature or raising the pressure of a system is collision theory.

Therefore, The correct options are B, A, A, C and D.

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The Aztec political system most closely resembles a theocracy where religious leaders influence political decisions, making Option B the correct answer as it aligns with the role of priests in Aztec governance.

The Aztec political system was most similar to a theocratic form of government where religious leaders held significant power in the state's political structure. Comparing the options provided to the Aztec system:

Option A suggests an attempt to keep religion out of politics, which is not characteristic of the Aztec system.

Option B reflects a scenario where religious leaders create policies, aligning closely with the Aztec theocracy where priests and the emperor, who was also seen as a divine figure, had substantial influence.

Option C implies an autocratic rule by a king without advice, which is not similar to the Aztec system that had a ruling elite and a structure of nobility.

Option D discusses a gender-based voting system, which is unrelated to the theocratic nature of the Aztec political system.

Therefore, the correct answer is B, a group of priests create all policies related to religion in a country. This reflects the Aztec civilization where political decisions were often intertwined with religious beliefs and practices, and religious leaders played a central role in governance.

Answer:

135g

Explanation:

The equation for the reaction is given below:

2H2 + O2 —> 2H2O

Next, let us calculate the mass of H2 that reacted and the mass of H2O produced from the balanced equation. This is illustrated below:

Molar Mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 2 x 2 = 4g

Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol

Mass of H2O from the balanced equation = 2 x 18 = 36g

From the balanced equation,

4g of H2 produced 36g of H2O.

Therefore, 15g of H2 will produce = (15x36)/4 = 135g of H2O

From the calculations made above, 15g of H2 produced 135g of water (H2O)

Final answer:

15 grams of hydrogen can produce 133.80 grams of water when reacted with sufficient oxygen, following the stoichiometry of the balanced chemical equation 2H₂ + O₂ → 2H₂O.

Explanation:

The question asks how many grams of water can be produced from 15 grams of hydrogen according to the balanced chemical reaction: 2H₂(g) + O₂(g) → 2H₂O(l).

Using stoichiometry, we first determine the molar mass of hydrogen (H₂). Since there are 2 moles of hydrogen in the reaction and the molar mass of hydrogen (H) is approximately 1.01 g/mol, the molar mass of H₂ is 2.02 g/mol. This means 2 moles of H₂ weigh 4.04 g.

Therefore, 15 grams of hydrogen is equivalent to 15 g H₂ × (1 mol H₂ / 2.02 g H₂) = 7.426 moles of H₂.

According to the balanced equation, 2 moles of H₂ produce 2 moles of H₂O. So, 7.426 moles of H₂ would produce 7.426 moles of H₂O.

As the molar mass of H₂O is 18.02 g/mol, 7.426 moles of H₂O would weigh:

7.426 moles × 18.02 g/mol = 133.80 g of H₂O.

Thus, 15 grams of hydrogen can produce 133.80 grams of water, assuming there's sufficient oxygen available to react completely with the hydrogen.

The new volume of [tex]H_2[/tex] gas is required.

The new volume of the required gas is 1.49 L.

[tex]P_1[/tex] = Initial pressure = 1 atm

[tex]P_2[/tex] = Final pressure = 2.50 atm

[tex]T_1[/tex] = Initial temperature = 273.15 K

[tex]T_2[/tex] = Final temperature = [tex]10.00^{\circ}\text{C}=10+273.15=283.15\ \text{K}[/tex]

[tex]V_1[/tex] = Initial volume = 3.60 L

[tex]V_2[/tex] = Final volume

From the ideal gas laws we have

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\\\Rightarrow V_2=\dfrac{P_1V_1T_2}{T_1P_2}\\\Rightarrow V_2=\dfrac{1\times 3.6\times 283.15}{273.15\times 2.5}\\\Rightarrow V_2=1.49\ \text{L}[/tex]

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The new volume of H₂ gas in the balloon, taken to the sea where the pressure is 2.50 atm and the temperature is 10.00°C, is approximately 3.63 liters. This calculation is based on the ideal gas law using the initial conditions at STP.

To find the new volume of H₂ gas in the balloon when taken to the sea, we can use the ideal gas law, which relates the pressure (P), volume (V), temperature (T), and the number of moles (n) of a gas. The ideal gas law is represented as:

PV = nRT

Where:

P = Pressure (in atm)

V = Volume (in liters)

n = Number of moles

R = Universal gas constant (0.0821 L·atm/mol·K)

T = Temperature (in Kelvin)

First, let's calculate the number of moles of H₂ gas in the balloon at STP (Standard Temperature and Pressure):

Pressure at STP (P₁) = 1 atm

Temperature at STP (T₁) = 273.15 K (0°C + 273.15)

Using the ideal gas law:

P₁V₁ = nRT₁

1 atm × 3.60 L = n × 0.0821 L·atm/mol·K × 273.15 K

n ≈ 0.150 moles

Now, we can use the new conditions at the sea:

Pressure at the sea (P₂) = 2.50 atm

Temperature at the sea (T₂) = 10.00°C + 273.15 = 283.15 K

We want to find the new volume (V₂) of H₂ gas

P₂V₂ = nRT₂

Substituting the values:

(2.50 atm) × V₂ = (0.150 moles) × (0.0821 L·atm/mol·K) × (283.15 K)

Now, solve for V₂:

V₂ ≈ (0.150 moles × 0.0821 L·atm/mol·K × 283.15 K) / 2.50 atm

V₂ ≈ 3.63 L

So, the new volume of H₂ gas in the balloon when taken to the sea is approximately 3.63 liters.

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Answer:B

Explanation: The blades spin making the insides create friction making electricity I think

The rate of a chemical reaction increases as the number of effective collisions between reacting particles increases.

The rate of a chemical reaction increases as the number of effective collisions between reacting particles increases. This is because an increase in the number of collisions leads to a greater chance of particles colliding with enough energy and the right orientation to react. As a result, the rate of the reaction increases.

Answer: I'm sure it's possible but we too lazy

Explanation:

Answer:

1) Solvent

2) Solute

3) Solute

Explanation:

According to the concept of solubility, benzene is a solvent and toulene and octylphenol ethoxylate are solutes.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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The statement that should be rightly mentioned with respect to the   equation of thermochemical is 4 Fe (s) + 3O2(g) -------> 2Fe2O3(s)        ΔH = -3926 KJ

It is a balanced of stoichiometric chemical equation that involved the change with respect to enthalpy, ΔH. Here the reactants and the product state should be considered as the liquid, solid, or in gaseous state.

Also, the value of the heat should be absorbed since  ΔH < 0 so the reaction should be considered as the exothermic and ΔH > 0 then the reaction is endothermic.

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The correct thermochemical equation is '4Fe (s) + 3O2 (g) → 2Fe2O3 (s), ΔH = −3,926 kJ', which includes the balanced chemical equation and the enthalpy change for the whole reaction.

The question asks which statement is a correctly written thermochemical equation. A proper thermochemical equation includes the balanced chemical equation alongside the enthalpy change (ΔH) for the reaction. The enthalpy change represents the heat absorbed or released during the reaction when it occurs at constant pressure. There is only one correct thermochemical equation provided:

4Fe (s) + 3O2 (g) → 2Fe2O3 (s), ΔH = −3,926 kJ

This equation is balanced and represents the reaction of iron (Fe) with oxygen (O2) to form iron(III) oxide (Fe2O3). The enthalpy change is given for the entire reaction, not per mole, which is the correct way to represent it in a thermochemical equation. The other equations either do not include the enthalpy change in the correct units or are missing it entirely.

Answer: 4m/s2 (B)

Explanation:

Force = mass × acceleration

Force given is 8N

Mass=2kg

Acceleration =?

Substitute into the formula

F=ma

8=2a

A=8/2

A=4m/s2

Acceleration used is 4m/s2 (B)

Answer:

b

Explanation:

Answer :

(a) The mass of [tex]Al_2O_3[/tex] produced is, 15.2 grams.

(b) The percent yield of the reaction is, 72.5 %

Explanation :

Part (a) :

Given,

Mass of [tex]Al[/tex] = 85.1 g

Molar mass of [tex]Al[/tex] = 27 g/mol

First we have to calculate the moles of [tex]Al[/tex]

[tex]\text{Moles of }Al=\frac{\text{Given mass }Al}{\text{Molar mass }Al}=\frac{85.1g}{27g/mol}=3.15mol[/tex]

Now we have to calculate the moles of [tex]Al_2O_3[/tex]

The balanced chemical equation is:

[tex]4Al+3O_2\rightarrow 2Al_2O_3[/tex]

From the reaction, we conclude that

As, 4 moles of [tex]Al[/tex] react to give 2 moles of [tex]Al_2O_3[/tex]

So, 3.15 moles of [tex]Al[/tex] react to give [tex]\frac{2}{4}\times 3.15=1.58[/tex] mole of [tex]Al_2O_3[/tex]

Now we have to calculate the mass of [tex]Al_2O_3[/tex]

[tex]\text{ Mass of }Al_2O_3=\text{ Moles of }Al_2O_3\times \text{ Molar mass of }Al_2O_3[/tex]

Molar mass of [tex]Al_2O_3[/tex] = 102 g/mole

[tex]\text{ Mass of }Al_2O_3=(1.58moles)\times (102g/mole)=161.2g[/tex]

Therefore, the mass of [tex]Al_2O_3[/tex] produced is, 161.2 grams.

Part (b) :

Now we have to calculate the percent yield of the reaction.

[tex]\text{Percent yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100[/tex]

Experimental yield = 116.9 g

Theoretical yield = 161.2 g

Now put all the given values in this formula, we get:

[tex]\text{Percent yield}=\frac{116.9g}{161.2g}\times 100=72.5\%[/tex]

Therefore, the percent yield of the reaction is, 72.5 %

Answer:

n₁ = 1.0× 10⁻⁴ mol

Explanation:

Given data:

Initial volume of balloon = 230 mL

Initial number of moles of He =?

Final number of moles of He = 3.8 × 10⁻⁴ mol

Final volume of balloon = 860 mL

Solution:

The given problem will be solve through Avogadro law,

"Number of moles of gas and volume are directly proportional to each other at constant temperature and constant pressure"

Mathematical relationship:

V₁/n₁ = V₂/n₂

No we will put the values.

230 mL  /n₁   = 860 mL/ 3.8 × 10⁻⁴ mol

n₁ = 230 mL× 3.8 × 10⁻⁴ mol/ 860 mL

n₁ = 874 × 10⁻⁴ mol. mL / 860 mL

n₁ = 1.0× 10⁻⁴ mol

Answer: the answer is n1=n2v1/v2

Explanation:

hope this helped

Answer:

A

Explanation:because since not all of them hove the sa

me program the pro duction is  slow

Answer:

The current model of the atom and the characteristics of each of the 3 subatomic particles are the electron cloud which contains 1 subatomic particle the electron which has negative charge and weights 1/2000 AMU the electron cloud surrounds the nucleus, the nucleus contains two subatomic particles the proton which has positive charge and weights one AMU and the neutron which has neutral/no charge and weights one AMU.

Answer:

2

Explanation:

S2x3=S6

Al2S3

S6/S3=2

0.11 moles of the gas are present in the sample of dry gas.

Explanation:

Data given:

mass of the gas  = 2.1025 grams

volume of the gas = 2.850 litres

temperature =  22 degrees (273.15+22) = 295.15 K

Pressure = 740 mm Hg or 0.973 atm

moles of the gas =?

R = 0.08206 atmL/Mole K

From the ideal gas law the number of moles can be calculated in the sample of dry gas. Number of moles will be determined by the pressure exerted, volume and temperature of the gas.

The formula:

PV = nRT

n = [tex]\frac{PV}{RT}[/tex]

putting the values in the above equation:

n = [tex]\frac{2.850 x 0.973}{0.08206 X 295.15}[/tex]

  = 0.11 moles

0.11 moles of the dry gas is present in the sample given.

When, a sample of dry gas weighing 2.1025 g is found to occupy 2.850 L at 22.0oC and 740.0 mm Hg. Then, total 0.0994 moles of gas are present.

First, we convert the temperature to Kelvin (T(K) = T(C) + 273.15) which is 22.0 + 273.15 = 295.15 K. Next, we convert pressure from mm Hg to atm by dividing by 760, as 1 atm = 760 mm Hg:

Pressure in atm = 740.0 mm Hg / 760 mm Hg/atm = 0.9737 atm.

Now we must solve for n, the number of moles of gas:

The number of moles of gas present is therefore 0.0994 moles.

Answer:

PN₂ = 191.3 Kpa

Explanation:

Given data:

Total pressure of tire = 245.0 Kpa

Partial pressure of PO₂ = 51.3 Kpa

Partial pressure of PCO₂  = 0.10 Kpa

Partial pressure of others =  2.3 Kpa

Partial pressure of PN₂ = ?

Solution:

According to Dalton law of partial pressure,

The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.

Mathematical expression:

P(total) = P₁ + P₂ + P₃+ ............+Pₙ

Now we will solve this  problem by using this law.

P(total) = PO₂ + PCO₂ + P(others)+ PN₂

245 Kpa = 51.3 Kpa + 0.10 Kpa + 2.3 Kpa + PN₂

245 Kpa = 53.7 Kpa+ PN₂

PN₂ = 245 Kpa -  53.7 Kpa

PN₂ = 191.3 Kpa

The partial pressure of nitrogen is determined to be 191.3 kPa.

The total pressure in the automobile tire is given as 245.0 kPa. To find the partial pressure of nitrogen (PN₂), we can use Dalton's Law of Partial Pressures, which states that the total pressure is the sum of the partial pressures of all gases present.

Here's the step-by-step calculation:

Using Dalton's Law:

Ptotal = PO₂ + PCO₂ + P-others + PN₂

Substituting the given values: 245.0 kPa = 51.3 kPa + 0.10 kPa + 2.3 kPa + PN₂

Rearranging to solve for PN₂:

PN₂ = 245.0 kPa - (51.3 kPa + 0.10 kPa + 2.3 kPa)

PN₂ = 245.0 kPa - 53.7 kPa

PN₂ = 191.3 kPa

Therefore, the partial pressure of nitrogen in the car tire is 191.3 kPa.

The boiling point decreases as the volume decreases.

Explanation:

The Temperature - Volume law otherwise called as Charles law is applied, which says that the volume of the given gas at constant pressure is directly proportional to the temperature measured in Kelvin. As the volume increases, the temperature also increases, if the volume decreases, then the temperature also decreases.

[tex]$\frac{V}{T} = constant[/tex]

As per the Charles law, here the volume is decreased from 50 ml to 25 ml so the boiling point also decreases.

Answer:

The correct answer is 0.17 M

Explanation:

We have the following data:

V= 820 ml x 1 L/1000 ml = 0.82 L

m = 7.4 g

Ammonium chloride has the chemical formulae NH₄Cl. So, we calculate the molecular weight (MM) of NH₄Cl from the molar mass of N, H and Cl as follows:

MM NH₄Cl = 14 g/mol + (4 x 1 g/mol ) + 35.4 g/mol = 53.4 g/mol

Now we have to calculate the number of moles of NH₄Cl we have in the solution. For this, we divide the mass (m) into the molecular weight of NH₄Cl (MM):

moles NH₄Cl = m/MM = 7.4 g/53.4 g/mol = 0.138 moles

The molarity of the solution is the number of moles of NH₄Cl in 1 liter of solution. So, we have to divide the number of moles of NH₄Cl into the volume in liters as follows:

M = number of moles NH₄Cl/V = 0.138 moles/0.82 L = 0.169 mol/L ≅ 0.17 M

Answer:

Molarity= 0.169M

Explanation:

Applying n= CV

V=820ml= 0.82dm3

n= m/M = 7.4/53.5 = 0.138mol

0.138= C× 0.82

C= 0.169M

Explanation:

Because molarity is classified as moles of solute per liter of water, dilution of the water may result in a reduction of its concentration.

Therefore, because the amount of moles of solute has to be constant for dilution, you will use the molarity and volume of that same target solution to calculate how many moles of solute will be present in the sample of the stock solution that you dilute.

c  =   [tex]\frac{n}{v}[/tex]

⇒  n = c ⋅  V

[tex]n_{HCL}[/tex] =  0.250 M  ⋅  6.00 L  = 1.5 moles HCl

Now all you have to do is figure out what volume of   6.0 M  stock solution will contain  1.5  moles of hydrochloric acid

c = [tex]\frac{n}{v}[/tex]

V = [tex]\frac{n}{c}[/tex]

[tex]V_{Stock}[/tex] = [tex]\frac{1.5 moles}{6.0 \frac{moles}{L} }[/tex]   = 0.25 L

Expressed in milliliters, the answer will be

[tex]V_{Stock} = 250ML[/tex] →  rounded to two sig figs

Answer:

Explanation:

True

Answer:

Fault-block mountain

In geography, fault-block mountains arise when the Earth's crust pulls apart and divides. Some parts of the Earth are pushed upwards whereas the other moves downward forming a divergent boundary. In geological studies, a divergent boundary can be described as a linear feature which arises due to plate tectonics which are being pulled apart from each other. Hence, fault-block mountains are most likely to be seen in a divergent boundary.

Most active divergent plate boundaries occur between oceanic plates and exist as mid-oceanic ridges. Divergent boundaries also form volcanic islands, which occur when the plates move apart to produce gaps that molten lava rises to fill.

Fault-block mountain

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Answer:

c.

Explanation:

it moves in slow convection currents, hope this helps!

The mantle moves in very slow currents, behaving like a non-Newtonian fluid, allowing the solid, yet plastically flowing rock to drive the motion of tectonic plates within the Earth's lithosphere.

The mantle of the Earth is characterized by its ability to move in very slow currents. This is due to the mantle behaving like a non-Newtonian fluid, similar to the material Silly Putty, which can deform under a slow, continuous stress. The mantle, although predominantly solid rock, flows plastically rather like a very viscous liquid, such as honey or corn syrup. The lithosphere, which includes the crust and the rigid uppermost part of the mantle, moves with the tectonic plates atop the slowly flowing asthenosphere. This process is integral to plate tectonics and influences the movement of the Earth's crust.

Among the choices provided, option C - It moves in very slow currents is the correct description regarding the mantle.

Answer: Strong acids disassociate more compared to weak acids. Since there are more ions, due to more disassociation, there are more ions for electrons to flow through.

Explanation:

Images would show an increase in both the dissociated ions (H+ ions and anions) and the undissociated weak acid molecules in a concentrated solution of weak acid. However, the proportion between them remains unchanged, indicating the properties of a weak acid.

In a solution of a weak acid, the acid does not fully dissociate, meaning not all of its molecules separate into hydrogen ions (H+) and anions. Instead, there is an equilibrium between the undissociated acid molecules and the ions. If the concentration of the weak acid solution was increased, the number of acid molecules, both dissociated and undissociated, would increase proportionally.

The images or visual representation of this would show an increase in both the dissociated ions (H+ ions and anions) and the undissociated weak acid molecules. However, the proportion between them would remain the same if no other factors are changed, showing the characteristics of a weak acid.

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Answer:

Gas

Explanation:

The concentration of the HCl solution is 0.047 M.

Explanation:

Data given about acid and base:

volume of acid Vacid = 46.9 ml

molarity of acid =?

volume of the base (NaOH) = 16.4 ml

molarity of the base = 0.135 M

To know the concentration of the acid in this reaction, the formula used in titration  is used. It is

Macid X Vacid = Mbase X Vbase

the formula is rewritten as:

Macid = [tex]\frac{Mbase X Vbase}{Vacid}[/tex]

putting the values in the equation:

Macid = [tex]\frac{0.135 X 16.4}{46.9}[/tex]

          = 0.047 M

the concentration of the acid i.e HCl in the solution is of 0.047 M.

Answer : The mole fraction of NaCl in a mixture is, 0.360

Explanation : Given,

Moles of [tex]NaCl[/tex] = 7.21 mole

Moles of [tex]KCl[/tex] = 9.37 mole

Moles of [tex]LiCl[/tex] = 3.42 mole

Now we have to calculate the mole fraction of [tex]NaCl[/tex].

[tex]\text{Mole fraction of }NaCl=\frac{\text{Moles of }NaCl}{\text{Moles of }NaCl+\text{Moles of }KCl+\text{Moles of }LiCl}[/tex]

Now put all the given values in this formula, we get:

[tex]\text{Mole fraction of }NaCl=\frac{7.21}{7.21+9.37+3.42}=0.360[/tex]

Therefore, the mole fraction of NaCl in a mixture is, 0.360

Answer:

.36

Explanation:

Answer:

601.8 mL

Explanation:

For an ideal gas kept at constant temperature and pressure, the number of moles of the gas is directly proportional to the volume of the gas:

[tex]n\propto V[/tex]

where

n is the number of moles

V is the volume of the gas

Therefore, for a gas undergoing a transformation at constant temperature and pressure, we can write:

[tex]\frac{V_1}{n_1}=\frac{V_2}{n_2}[/tex]

where here we have:

[tex]V_1=343.4 mL[/tex] is the initial volume of the gas

[tex]n_1=0.214 mol[/tex] is the initial number of moles

[tex]n_2=0.375 mol[/tex] is the final number of moles

Solving for V2, we find the final volume of the gas:

[tex]V_2=\frac{n_2 V_1}{n_1}=\frac{(0.375)(343.4)}{0.214}=601.8 mL[/tex]

The volume would 0.375 mol of argon gas occupy under the same conditions will be "601.8 mL".

According to the question,

Gas initial volume, V₁ = 343.4 mL

Initial no. of moles, n₁ = 0.214 mol

Final no. of moles, n₂ = 0.375 mol

We know that,

Moles of gas ∝ Volume of gas

or,

                   n ∝ V

and, the relation will be:

→ [tex]\frac{V_1}{n_1} = \frac{V_2}{n_2}[/tex]

then,

The final volume be:

→ V₂ = [tex]\frac{n_2 V_1}{n_1}[/tex]

By substituting the values, we get

       = [tex]\frac{0.375\times 343.4}{0.214}[/tex]

       = [tex]\frac{128.775}{0.214}[/tex]

       = 601.8 mL  

Thus the above answer is correct.

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Answer:

Im not completely sure about the answer, but A and C are Wrong

Explanation:

This is because the snail growing its shell is a physical change. For the shell of a snail to grow, the snail must consume Calcium to grow its shell. And would grow it just like how we grow our fingernails!

Rust forming on a bicycle frame is an example of a chemical change. This is caused by metal being exposed to oxygen. Just like when you leave your bike outside in the rain, it'll get rusty!

Both snails growing shells and rust forming on a bicycle frame are chemical changes. The former involves the secretion of calcium carbonate, while the latter is the formation of iron oxide due to the reaction of iron with oxygen.

The two changes, snails growing shells and rust forming on a bicycle frame, have a common feature - they are both chemical changes.

Snails growing shells is a chemical change because the process of shell growth involves the secretion of calcium carbonate, a chemical process.

Similarly, when a bicycle frame rusts, it is also a chemical change. This is because rust, or iron oxide, forms when oxygen in the air reacts with the iron in the metal - this is a chemical reaction.

Hence option C is correct.

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