what is [po43–] at equilibrium when 75 ml of 0.80 m pb(no3)2(aq) is mixed 10. ml of 0.10 m na3po4(aq) at 25 °c given that the ksp of pb3(po4)2 is 1.0×10–54? 1.8

Answer:

Power is an objects' change in energy over a specific time.

We define the term power as the rate of the change of energy with time. We know that the energy of a body has to do with the ability of the body to do work.

This implies that we can be able to write the formula of the power of a body as the following;

Power = Energy/ Time

Thus we can now see that power is the change in energy over a specific time. This is how we can be able to obtain the /power of an object under study.

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Answer:

This self evaluation helps them to better his sport.

Explanation:

This is the right way to evaluate the performance of John because this sketch shows him the way he perform in the match. Due to this sketch he can better his performance and remove all the mistakes he had done in the match which results in better performance of John in the next match. This self evaluation helps them to better his sport and got new chances in order to select for a better club or national soccer team.

An element can have multiple isotopes. Isotopes correspond to variations of the same element with respect to the number of neutrons in its nucleus. the number they give us, 35 and 37 correspond to the mass number of chlorine. The percentage will be how abundant the element is.

To find the average atomic mass we must multiply the mass of the isotope by its respective percentage of abundance and add these two results.

So, the average atomic mass of Cl will be:

Answer: the average atomic mass of chlorine is 35.454 amu

Answer:

71.92 kPa

Explanation:

Using the combined gas law equation;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (kPa)

P2 = final pressure (kPa)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

T1 = 50°C = 50 + 273 = 323K

V1 = 105L

T2 = -25°C = -25 + 273 = 248K

P2 = 105.4 kPa

P1 = ?

V2 = 55.0 L

Using P1V1/T1 = P2V2/T2

P1 × 105/323 = 105.4 × 55/248

105P1/323 = 5797/248

0.325P1 = 23.375

P1 = 23.375 ÷ 0.325

P1 = 71.92 kPa

Answer:

Bromine fluoride

The equilibrium composition of CO₂ is determined to be 0.59 kmol.

To solve this problem, we can use the ideal gas law and the equilibrium constant expression for the reaction:

CO + 1/2O₂ ⇌ CO₂

Given the initial number of moles of CO and O₂, we can set up an ICE (Initial, Change, Equilibrium) table. Let's assume that x kmol of CO is consumed and converted to CO₂. Then, the change in the number of moles for each species is:

CO: -x kmol

O₂: -0.5x kmol

CO₂: +x kmol

At equilibrium, the number of moles of CO is (2 - x) kmol, O₂ is (3 - 0.5x) kmol, and CO₂ is x kmol. The equilibrium constant expression can be written as:

Kp = (P_CO₂) / (P_CO * P_O₂(1/2))

Given Kp = 16.461 and the pressure conditions, we can substitute the equilibrium partial pressures into the expression:

16.461 = x / ((2 - x) * (3 - 0.5x)(1/2))

Solving this equation yields x ≈ 0.59 kmol.

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Answer:

The element is in group 7, the halogens. The element is in the third period or row of the table.

Explanation:

Chlorine is element number 17.

Answer: a mercury thermometer is better to measure very small changes in temperature

Explanation:

i took the test and got it right

Answer:

the answer is C, a mercury thermometer is better to measure very small changes in temperature.

Explanation:

i just took the test and it was correct :)

Convection currents in the mantle, symbolized by region 3 in the diagram, play a significant role in tectonic plate movement.

The Earth's lithosphere, or outermost layer, which comprises the crust and highest section of the mantle, is made up of massive, solid chunks called tectonic plates. These plates are floating on top of the underlying, more fluid asthenosphere and fit together like jigsaw pieces. The African Plate, Eurasian Plate, Pacific Plate, and North American Plate are only a few of the larger tectonic plates. There are also numerous smaller ones.

Because of the heat produced by the core, the mantle, which is the deepest layer of the Earth, is made up of hot, molten rock that is continually in motion. Convection currents are produced by this movement, which transport heat from the core to the surface and back down again. These currents cause the hard lithospheric plates to move and shift over time as they are being dragged along by the currents.

A number of geological events, such as the generation of new crust at mid-ocean ridges, the movement of continents, and the development of volcanic hotspots, are caused by the convection currents in the mantle. For the purpose of foreseeing and minimizing natural disasters, such as earthquakes and volcanic eruptions, it is crucial to comprehend the dynamics of these currents.

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Answer:

C. 3

Explanation:

plato

Answer: 360g potassium chlorate

40g KCIO3 - 400g H2O = 360g KCIO3

Answer:

glycerin

Explanation:

Glycerol is easily soluble in water, because the ability of the polyol groups to form hydrogen bonds with water molecules.

Answer:

2H2 + O2 ⇒ 2H2O

Explanation:

In order to balance a chemical equation you need to make sure that the number of atoms on both sides of the equation are equal.

H2 + O2 = H2O

H = 2

O = 2

Products:

H = 2

O = 1

Change coefficient to 2:

H = 2 × 2 = 4

O = 1 × 2 = 2

H2 + O2 = 2H4O

H2 = 2H2 = 2 × 2 = 4

2H2 + O2 ⇒ 2H2O

Hope this helps.

The dissociation factor is 2 and the freezing point of the solution is -64.5 °C.

Sodium chloride is a 2-ion electrolyte, dissociating 90% in a certain concentration.

(a) Calculation of dissociation factor

Dissociation factor can be defined as the ratio of the number of ions produced from a compound to the number of molecules dissolved. This factor determines the degree to which an electrolyte dissociates in water.

Sodium chloride dissociates into Na⁺ and Cl⁻ ionsNaCl → Na⁺ + Cl⁻

The dissociation factor of Sodium Chloride is given by the expression;

α = [Total number of ions produced] / [Total number of molecules]

α = [2] / [1]α = 2

(b) Calculation of the freezing point of a molal solution

Freezing point of the solution is given by;

ΔTf = iKfm

where ΔTf is the change in freezing point, i is the van't Hoff factor, Kf is the freezing point depression constant, and m is the molality of the solution.

Due to the dissociation of NaCl into Na⁺ and Cl⁻ ions, i will be equal to 2.

The freezing point depression constant for water is given as Kf = 1.86 °C/m.

Molality is defined as the number of moles of solute per kilogram of solvent. The molecular weight of NaCl is 58.44 g/mol. So, the number of moles in 1 kg of NaCl is:

1 kg of NaCl = 1000 g / 58.44 g/mol= 17.1 molal

Thus, ΔTf = 2 * 1.86 °C/m * 17.1 molal= 64.5 °C

Therefore, the freezing point of the solution is -64.5 °C.

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The proton number has the highest value in the ion

In an atomic element Q, the mass number is the number of the proton and the neutron, the electron encircles around the nucleus of the atomic element.

Recall that:

∴

The atomic element Q+ has a positively charged ion, Thus, the proton number in the mass of the atomic element Q, therefore, has the highest value in the ion.

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Using this formula, we can calculate the confidence interval once we have the sample data, without the sample data, it is not possible to provide an accurate confidence interval estimate.

To construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system, we would need the sample data, specifically the number of cell phone users and the number of users who developed cancer. Without the sample data, it is not possible to provide an accurate confidence interval estimate.

However, if we assume that we have the necessary sample data, we can proceed with the calculation. The formula for calculating a confidence interval for a proportion is:

Confidence interval

\(=�^±�×�^(1−�^)�Confidence interval= p^​ ±z× np^​ (1− p^​ )​ ​ where:�^p^​\)

 is the sample proportion (number of users with cancer divided by the total number of cell phone users).

\(�\)

z is the z-score corresponding to the desired confidence level (90% confidence level corresponds to a z-score of approximately 1.645).

\(�\)

n is the sample size (total number of cell phone users).

Using this formula, we can calculate the confidence interval once we have the sample data.

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Answer:

not balanced, oxygen, not equal

Explanation:

Alright, so let's go ahead and balance this equation!

The easiest way to do this is to take out a piece of paper and write down your elements on each side. Let's do it together:

--------------------------------------------------------------------------------------------------------------

\(2NaOH + H_{2} SO_{4}\)  →  \(Na_{2}SO_{4} + H_{2}O\)

Let's count the number of molecules for each element on both sides. Starting with the left side:

↓

\(2(NaOH) + H_{2} SO_{4}\)

The coefficient of 2 in front of NaOH will be distributed to Na, O, and H. The subscripts for H and O only apply to themselves, so S will have only one molecule. Then our molecule counts for the reactant side (the left side) will be:

↓

Na:  2

 O:  2+4 = 6

 H:  2+2 = 4

 S:   1

↓

Now, let's move on to the right side:

\(Na_{2}SO_{4} + H_{2}O\)

This side only has subscripts, no coefficients, so that means that any elements that don't have subscripts (S and the second O ) will have a count of one. Knowing this, our molecule count for the product side (right side) is:

↓

Na:  2

 O:  4+1 = 5

 H:  2

 S:   1

↓

Let's compare our counts now:

Left side:        Right side:

Na:  2             Na:  2

 O:  6               O:  5

 H:  4               H:  2

 S:   1                S:  1

We can see that our O and H molecule counts are different. So that means it's an unbalanced equation.

--------------------------------------------------------------------------------------------------------------

Therefore, your answer will be:

The equation is not balanced because the number of hydrogen atoms and oxygen atoms is not equal in the reactants and in the products.

Answer:

3.) 195

Explanation:

Because platinum is 195.079 amu (its on the periodic table)

A purple box has P t at the center and 78 above. Below it says platinum and below that 195.08. Rounded to the nearest whole number, 195 is the atomic mass of platinum. Therefore, option C is correct.

The number of protons an element contains determines its atomic number, which is used to distinguish one element from another. The total number of protons and neutrons in an element determines its mass number.

The mass number is the total number of protons and neutrons in the nucleus. This is due to the fact that each proton and neutron has a mass of one atomic mass unit (amu). You can determine the mass of the atom by multiplying the total number of protons and neutrons by 1 amu.

Because its numerical value is equal to the element's molar mass, the average atomic mass is helpful. In turn, this helps determine how much of a solid.

The atomic mass of platinum is 195. Because atomic mass is always the bottom number below the name of the element.

Thus, option C is correct.

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The aqueous solutions can be arranged in increasing boiling point order as follows: 0.050m Al(ClO4)3 < 0.110m K2CO3 < 0.300m C6H12O6.

The boiling point of a solution is influenced by the concentration of solute particles in the solution. The greater the concentration of solute particles, the higher the boiling point. In this case, we are comparing the boiling points of three different aqueous solutions.

The solution with the lowest boiling point is 0.050m Al(ClO4)3. This is because Al(ClO4)3 is an ionic compound that dissociates into multiple ions in water, thereby increasing the number of solute particles. Higher concentration of solute particles raises the boiling point.

The solution with the next higher boiling point is 0.110m K2CO3. K2CO3 is also an ionic compound and dissociates into two ions in water. Although the concentration is higher compared to Al(ClO4)3, it is lower than that of C6H12O6.

The solution with the highest boiling point is 0.300m C6H12O6. C6H12O6, which is glucose, is a molecular compound and does not dissociate into ions in water. Therefore, it has the lowest concentration of solute particles among the given solutions, resulting in the lowest boiling point.

Hence, the correct order of increasing boiling points is 0.050m Al(ClO4)3 < 0.110m K2CO3 < 0.300m C6H12O6.

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Answer:

They vibrate about a fixed position

Answer:

Simple molecules contain only a few atoms held together by covalent bonds .

In an ecosystem, biosphere is an earth's sphere which  consists of all living things.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The part that is the source of the activation energy required is the flame and the reaction is endothermic.

In this scenario, the source of the activation energy required is the flame on the gas stove. The flame provides the heat energy necessary to increase the kinetic energy of the water molecules and cause them to move faster, resulting in an increase in the temperature of the water.

The process of heating the water is an endothermic reaction because energy is being absorbed from the surroundings (in this case, from the flame) in order to increase the temperature of the water.

As the water absorbs heat energy from the flame, the potential energy of the water molecules increases, causing them to move faster and collide more frequently, which leads to an increase in the temperature of the water.

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Answer:

0.069 moles of glucose

Explanation:

(0.138 mol/L)(0.5 L) = 0.069 moles of glucose

Answer:

\(\boxed {\boxed {\sf 0.069 \ mol \ C_6H_12O_6}}\)

Explanation:

Molarity is the moles per liter of a solution. It is found by dividing the moles of solute (glucose) by the liters of solution (water).

\(M= \frac {moles}{liters}\)

We know the molarity is 0.138 M. 1 M is equal to 1 mole per liter, so we can rewrite the molarity as 0.138 moles per liter.

There are 0.5 liters of solution.

We are solving for the moles, so we can use x.

\(0.138 \ mol/L= \frac {x }{0.5 \ L}\)

We must isolate the variable (x) to solve for the moles. It is being divided by 0.5 liters. The inverse operation of division is multiplication. Multiply both sides of the equation by 0.5 L.

\(0.5 \ L *0.138 \ mol/L= \frac {x }{0.5 \ L}* 0.5 \ L\)

The liters on both sides cancel.

\(0.5 *0.138 \ mol= {x }\)

\(0.069 \ mol =x\)

\(0.069 \ mol \ C_6H_12O_6\)

Ther are 0.069 moles of glucose in a 0.138 M solution with 0.5 liters of water.

Answer:

Using glucose to provide energy for the body

Explanation:

In the given scenario, during the passage of current through a solution of sodium chloride, 2.68×10^16 Na+ ions arrive at the negative electrode and 3.92×10^16 Cl- ions arrive at the positive electrode within a time period of 1.00 second.

The ratio of the number of Na+ ions to the number of Cl- ions is 2.68×10^16:3.92×10^16, which can be simplified to approximately 0.68:1. This indicates that for every 0.68 Na+ ions that arrive at the negative electrode, 1 Cl- ion arrives at the positive electrode.

During electrolysis, ions in the solution migrate towards the electrodes based on their charges. At the negative electrode (cathode), cations such as Na+ gain electrons and are reduced, while at the positive electrode (anode), anions like Cl- lose electrons and are oxidized. The flow of ions is driven by the applied electric field.

In this case, the ratio of Na+ ions to Cl- ions that arrive at the electrodes depends on the charge and stoichiometry of the reaction. Since the charge on each Na+ ion is +1 and on each Cl- ion is -1, the ratio of their charges is 1:1.

This implies that for every 1 Cl- ion that arrives at the positive electrode, 1 Na+ ion should arrive at the negative electrode. However, the given data shows a slightly different ratio of 0.68:1, indicating that some factors like diffusion or other side reactions may have influenced the movement of ions.

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Answer:

Ideal Gas Law?

Explanation:

PV = nRT

V is proportional to T thus at constant P it should increase with T

Answer:

The law that states that volume increases with temperature (at constant pressure) is known as Gay-Lussac's Law or the pressure-volume law. It states that the volume of a gas is directly proportional to its temperature, when the pressure is kept constant. This means that if the temperature of a gas is increased, its volume will also increase, and if the temperature is decreased, the volume will decrease. This law is a part of the ideal gas laws, which describe the behavior of gases under various conditions.

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To convert 195 grams of zinc into zinc sulfide, 95.8 grams of sulfur are required.

The most well-known instance of an oxidation-reduction reaction that is also a synthesis reaction is the rusting of iron. One of the most memorable redox reactions your students will ever witness is the synthesis of zinc sulfide from elemental zinc and sulfur, despite the fact that it is less well-known.

195 g Zn / 65.38 g/mol = 2.98 mol Zn

2.98 mol Zn × 1 mol S / 1 mol Zn = 2.98 mol S

2.98 mol S × 32.06 g/mol = 95.8 g S

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I think it's c I'm not sure

Answer:

D

Explanation:

The salamanders undergo se×ual reproduction.

This is defined as the production of new organisms by the combination of genetic information of two individuals of different genders.

Thus results in variations in the offsprings produced which us why the Salamanders had different color patches.

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