an unknown salt, m2z, has a ksp of 5.5 × 10–9. calculate the solubility in mol/l of m2z.

Answer:

91.60 grams

Explanation:

For this specific problem, you are asked to find the weight of an element, when given moles. Other problems could give you a compound. In each case, you need to find the molar mass of the element or compound, that is, the weight (in grams) of 1 mole of the element or compound. Now that you know the molar mass of the element/compound, you can multiply by the amount of moles the equation the equation gives you to find the total weight.

In this problem, you are asked to find the mass of Sodium (Na). First, we need to look on the Periodic Table to find the Atomic Mass of Sodium. If we look, we find this to be 22.990 amu. Side note - when we find molar mass, amu and grams are interchangeable - you'll see here. This 22.990 amu is also the molar mass in GRAMS of 1 mole of sodium. The equation asks us to find the mass of 4 moles of sodium, so now we simply multiply by 4. 22.990 * 4 = 91.60 grams.

In summary, find the molar mass (1 mole) of the substance, by adding the amu's of each element (keeping mind the amount of each). Then, multiply this total number by the amount of moles that is given, and put your answer in moles.

Hope this helps

Answer:

If you can identify the species that was being oxidized, its species that contains the element on the other side is the reducing agent.

For example, in the equation Zn + Cu2+ --> Zn2+ + Cu, the zinc was oxidized, making Zn the reducing agent.

The heat of reaction when 44.4 ml of 1.3M nitric acid reacts with 51.5 ml of 0.6M sodium hydroxide is 1.65 KJ/mol.

The neutralization reaction of HNO₃ and NaOH takes place according to the reaction as,

HNO₃+ NaOH → NaNO₃ + H₂O

So, as we can see, one mole of HNO₃ reats completely with one mole of NaOH.

The heat of reaction is the heat the heat released when one mole of HNO₃ completely reacts with one mole of NaOH. For one mole, the heat of reaction is 53.7 KJ/mol

Now, in this case 44.4 ml of 1.3M nitric acid reacts with 51.5 ml of 0.6M sodium hydroxide.

So, millimoles of HNO₃ are 57.59 millimoles.

Now, millimoles of NaOH are 30.9 millimoles.

So, because NaOH is limiting reagent, so,

The heat of the reaction will be,

Heat of reaction = 53.7 x 1000 x 30.9/1000

Heat of reaction = 1.65 KJ/mol.

So, the heat of the reaction is 1.65 KJ/mol.

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The balanced chemical equation for the reaction between quicklime (calcium oxide, CaO) and water (H2O) is as follows:

CaO + H2O → Ca(OH)2

This equation represents a classic example of an acid-base reaction, in which the calcium oxide, which is a basic oxide, reacts with water, a proton donor, to form calcium hydroxide, a strong base. The reaction is exothermic and releases a significant amount of heat, making it useful for various industrial applications, such as in cement production and as a desiccant.

Calcium hydroxide, also known as slaked lime, is a white crystalline solid that is sparingly soluble in water and has many applications in agriculture, construction, and environmental remediation.

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95.57% is the percent Cu recovered by the student

What is nitric acid ?

Nitric acid (HNO3), a colorless, fuming, highly corrosive liquid (freezing point -42 °C [-44 °F], boiling point 83 °C [181 °F]). A chemical used in the manufacture of fertilizers and explosives. Toxic and can cause severe burns. The production and use of nitric acid was known to early alchemists. A long-used experimental procedure attributed to the German chemist Johann Rudolf Glauber (1648) was to heat potassium nitrate with concentrated sulfuric acid. , Joseph Louis Gay-Lussac and Claude-Louis Berthollet established its chemical composition.

percentage of cu recovered = isolated cu / sample of cu = 0.367/0.384=95.57 %

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10.63 grams of ZnO remain after the reaction is complete.

The balanced chemical equation for the reaction between zinc oxide and water is:

ZnO(s) + H2O(l) → Zn(OH)2(aq)

No. of moles of ZnO = Mass of ZnO / Molar mass of ZnO= 35.0 g / 65.38 g/mol= 0.535 moles of ZnO

The amount of water is given as 6.85 g

The molar mass of water is:H2O = 18.02 g/mol

No. of moles of H2O = Mass of H2O / Molar mass of H2O= 6.85 g / 18.02 g/mol= 0.380 moles of H2O

Now, we need to find out the limiting reagent.

.No. of moles of Zn(OH)2 formed from 0.535 moles of ZnO = 0.535 molesNo. of moles of Zn(OH)2 formed from 0.380 moles of H2O = 0.380 moles

Therefore, since the amount of ZnO (0.535 moles) is greater than the amount of H2O (0.380 moles), H2O is the limiting reagent and ZnO is the excess reagent.

The maximum amount of Zn(OH)2 that can be formed is given by the amount of ZnO that reacts with H2O, which is 0.380 moles.

No. of grams of Zn(OH)2 = No. of moles of Zn(OH)2 × Molar mass of Zn(OH)2= 0.380 mol × (97.41 g/mol)= 37.08 gThe formula for the limiting reagent is H2O. The amount of excess reagent remaining after the reaction is complete can be calculated by subtracting the amount of limiting reagent used from the initial amount of excess reagent

.Initial amount of excess reagent (ZnO) = 35.0 g

No. of moles of ZnO = Mass of ZnO / Molar mass of ZnO= 35.0 g / 65.38 g/mol= 0.535 moles of ZnO

Amount of ZnO used in the reaction = No. of moles of Zn(OH)2 formed × Ratio of ZnO to Zn(OH)2= 0.380 mol × (1 mol ZnO / 1 mol Zn(OH)2)= 0.380 moles of ZnO used

Amount of ZnO remaining after the reaction = Initial amount of ZnO − Amount of ZnO used= 35.0 g − (0.380 mol × 65.38 g/mol)= 10.63 g

Therefore, 10.63 grams of ZnO remain after the reaction is complete.

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The manganese dioxide would lower the activation energy for the decomposition of the hydrogen peroxide. Option D

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the reaction. Catalysts work by providing an alternative, lower-energy pathway for the reaction to occur, thus reducing the activation energy required for the reaction to proceed. As a result, the reaction rate is increased, and the reaction can proceed more quickly and efficiently.

The function of the manganese dioxide is that of a catalyst as it lowers the potential energy so that the reaction can take place.

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Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.

The tissue that plays this outer covering of a plant for is the  epidermis and its waxy cuticle. It prevents damage to the plant.

Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

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Answer:

In the same phase

Explanation:

Because when you make a solution you have to keep them in the same phase or you will oof.

Explanation:

Atoms of the same element that differ in their numbers of neutrons are called isotopes. ... Different isotopes of an element generally have the same physical and chemical properties because they have the same numbers of protons and electrons.

The electron ended up in the n = 3 level of the hydrogen atom.

The process described in the question is an example of an electron transitioning from a higher energy level to a lower energy level in the hydrogen atom, which results in the emission of a photon of light. The wavelength of this photon is given as 434 nm.

To determine the value of n for the level to which the electron ended up, we need to use the formula for the energy of an electron in the hydrogen atom:

E = -13.6 eV/n^2

where E is the energy of the electron, n is the principal quantum number of the energy level, and eV is electron volts, a unit of energy commonly used in atomic physics.

The energy difference between the two levels involved in the transition is given by the equation:

ΔE = E_final - E_initial

where E_final is the energy of the final state (the lower energy level), and E_initial is the energy of the initial state (the higher energy level).

We can use the fact that the energy of the emitted photon is equal to the energy difference between the two levels involved in the transition:

E_photon = hν = ΔE

where h is Planck's constant, and ν is the frequency of the photon (which can be related to its wavelength λ by the equation ν = c/λ, where c is the speed of light).

In this case, we are given the wavelength of the emitted photon as 434 nm. Converting this to frequency using the equation above, we find:

ν = c/λ = (3.00 × 10^8 m/s) / (434 × 10^-9 m) ≈ 6.91 × 10^14 Hz

We can then use the energy-frequency relation (E = hν) to find the energy of the emitted photon:

E_photon = hν = (6.626 × 10^-34 J s) × (6.91 × 10^14 Hz) ≈ 4.57 × 10^-19 J

Since this energy is equal to the energy difference between the two energy levels involved in the transition, we can set ΔE equal to this value:

ΔE = E_final - E_initial = 4.57 × 10^-19 J

Now we can use the formula for the energy of an electron in the hydrogen atom to solve for the value of n for the final energy level:

E_final = -13.6 eV/n_final^2

Substituting in the value of ΔE and converting to electron volts, we have:

4.57 × 10^-19 J = (1.602 × 10^-19 J/eV) × (E_final - E_initial) = (E_final - E_initial)/0.624

Solving for E_final - E_initial, we get:

E_final - E_initial = 7.33 eV

Substituting this into the equation for the energy of an electron in the hydrogen atom, we have:

-13.6 eV/n_final^2 - (-13.6 eV/5^2) = 7.33 eV

Simplifying and solving for n_final, we get:

n_final ≈ 3

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A. The ionic formula for the compound formed between Na⁺ and O²⁻ is Na₂O.

B. The ionic formula for the compound formed between Br⁻ and Al³⁺ is AlBr₃.

What is an ionic formula?

Ionic formula, also known as chemical formula, is a representation of a chemical compound that shows the relative number and types of ions present in the compound. It is the shorthand notation that is used to describe the ionic compound in a simple and concise manner. Ionic compounds are composed of positively charged ions (cations) and negatively charged ions (anions) held together by electrostatic forces of attraction.

The ionic formula shows the ratio of ions in the compound, with the cation written first and the anion written second, using subscripts to indicate the number of each ion present. For example, the ionic formula for table salt (sodium chloride) is NaCl, which indicates that one sodium ion (Na+) is present for every one chloride ion (Cl-) in the compound. The ionic formula is essential in understanding the composition and properties of ionic compounds and is widely used in chemical nomenclature, chemical equations, and chemical reactions.

This is because sodium (Na⁺) has a valency of +1, while oxygen (O²⁻) has a valency of -2. To form a neutral compound, two sodium ions are needed for every one oxygen ion, resulting in the formula Na₂O.

This is because aluminum (Al³⁺) has a valency of +3, while bromine (Br⁻) has a valency of -1. To form a neutral compound, three bromine ions are needed for every one aluminum ion, resulting in the formula AlBr₃.

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The correct expression relating the rates of consumption of reactants and the rates of formation of products for the given reaction is A[\(LaCl_{3}\)] / 2Δt = A[La_{2}(CO_3){3}] / 3Δt = A[\(Na_{2}CO_{3}\)] / Δt.

The balanced chemical equation for the reaction is 2LaCl_{3}+ 3\(Na_{2}CO_{3}\)→ La_{2}(CO_3){3} + 6NaCl. To determine the expressions relating the rates of consumption of reactants and the rates of formation of products, we can use the stoichiometric coefficients from the balanced equation. According to the stoichiometry of the reaction, for every 2 moles of \(LaCl_{3}\)consumed, 1 mole of La_{2}(CO_3){3}is formed. Therefore, the expression relating the rates of consumption of LaCl3 and formation of La_{2}(CO_3){3}is A[LaCl_{3}] / 2Δt = A[\(La_{2}(CO_3){3}\)] / Δt. Similarly, for every 3 moles of \(Na_{2}CO_{3}\)consumed, 1 mole of La_{2}(CO_3){3} is formed. Therefore, the expression relating the rates of consumption of \(Na_{2}CO_{3}\) and formation ofLa_{2}(CO_3){3}is A[] / 3Δt = A[La_{2}(CO_3){3}] / Δt.

From the balanced equation, we can also see that 6 moles of NaCl are formed for every 2 moles of LaCl3 consumed. However, the question does not provide options involving the rate of consumption of NaCl. In conclusion, the correct expression relating the rates of consumption of reactants and the rates of formation of products for the given reaction is A[LaCl_{3}] / 2Δt = A[La_{2}(CO_3){3}] / 3Δt = A[\(Na_{2}CO_{3}\)] / Δt.

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Answer:

3.88g/mL

Explanation:

Density could be understood as the mass of a compound when it occupies 1mL.

To find the mass in 1mL we need to determine the volume that the piece occupies:

Based on Archimedes' principle, the volume of water displaced is equal to volume of the aluminium piece, that is:

54.4mL - 41.8mL = 12.6mL

As the piece has as mass 48.9g, the density is:

48.9g / 12.6mL =

Answer:

enantiomers

Explanation:

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Answer:

firefly-pea plant-moss

Explanation:

got it from someone else

Answer:

fire , plant, moss

Explanation:

Answer:

q=309.6 J

Explanation:

Here we'll be using the formula of specific heat capacity: Q=mcΔT

Q= heat (joules)

m=mass (g)

c=specific heat capacity

ΔT= change in temperature > Final temp. - initial temp.

Let's plug in what we know and solve for q=heat.

q=(20)(0.387)(50-10)

q=(20)(0.387)(40)

q=309.6 joules

Depending on your teacher and the problem, they might want you to keep the temperature in C. Mine wanted them all in Kelvin, so if we were to convert it to Kelvin it would be:

273 + 40= 313 K

q=(20)(0.387)(313)

q=2422.6 J

The EPA stream quality indicator for dissolved oxygen in stream water is:c. 5 mg per liter

Dissolved oxygen (DO) is an important indicator of the health of a water body. The EPA (Environmental Protection Agency) has set guidelines for the minimum dissolved oxygen levels to support a healthy aquatic ecosystem. For streams, the recommended minimum level of dissolved oxygen is 5 mg per liter. This level ensures that the water can support a diverse range of aquatic life, including fish, invertebrates, and other organisms.
To maintain good water quality, it's essential to regularly monitor dissolved oxygen levels using various sampling methods and equipment. If dissolved oxygen levels drop below the recommended threshold, it can indicate problems such as pollution or excessive nutrient loading, which can lead to eutrophication and negatively impact the ecosystem.

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The fact that water has a high melting and boiling point (0°C/32°F for melting and 100°C/212°F for boiling) makes it unique.

When a substance's solid and liquid phases are in equilibrium, that point is known as its melting point. When a substance's vapour pressure matches the outside pressure, that's when it reaches its boiling point.

Saturation temperature is another name for boiling point. The pressure at when the measurement was made can occasionally be used to define boiling point. The standard boiling point is the temperature at which water begins to boil at one bar of pressure, according to the International Union on Pure an Applied Chemistry (IUPAC) definition from 1982.

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When helium is heated from 9.0 °C to 79.0 °C and expands from a volume of 3.50 L to 3.89 L, it is an indication that the process is an isobaric process. The reason for this is that the pressure remains constant throughout the process.

Isobaric processes are also referred to as constant pressure processes. It is a thermodynamic process in which the pressure remains constant while the volume changes. Heat is absorbed by the gas when it is heated, causing its molecules to gain kinetic energy. As the kinetic energy increases, the molecules' movement becomes more erratic, and they begin to collide with each other more frequently. As a result, the distance between them expands, resulting in an expansion in the volume of the gas. The ideal gas law states that PV=nRT where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin (K). In an isobaric process, pressure (P) is constant, and since n, R, and P remain constant, the ideal gas law can be simplified as: V/T = constant. This equation shows that if temperature (T) increases, then volume (V) must also increase in order to keep the constant value intact. In the given problem, the volume increased from 3.50 L to 3.89 L due to the heating of helium from 9.0 °C to 79.0 °C.

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Answer:

3,048 minutes

Explanation:

762 divided by 5

that number times 20

The time required for a physics teacher to jog continuously and REALLY wanted to get there will be 50 hours and 48 minutes.

The distance covered by the particle or the body in an hour is called speed. It is a scalar quantity. It is the ratio of distance to time.

We know that the speed formula

Speed = Distance/Time

It is 762 miles from here to Chicago. An obese physics teacher jogs at a rate of 5.0 miles every 20.0 minutes.

Then the speed of the physics teacher will be

Speed = 5 / (20 / 60)

Speed = 15 miles per hour

The time required for a physics teacher to jog continuously and REALLY wanted to get there will be

15 = 762 / T

T = 762 / 15

T = 50.8 hours

T = 50 hours and 48 minutes

The time required for a physics teacher to jog continuously and REALLY wanted to get there will be 50 hours and 48 minutes.

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The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

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complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

The cycloalkanes with a molecular formula C6H12 that have a 4-membered ring and one substituent are cyclobutane and its derivatives.

Cyclobutane is a cyclic hydrocarbon with a 4-membered ring. It consists of four carbon atoms and has the molecular formula C4H8. By adding two additional hydrogen atoms to each carbon atom, we can obtain cyclobutane with a molecular formula of C6H12. Cyclobutane can have various substituents attached to the carbon atoms of the ring, resulting in different derivatives of cyclobutane. These derivatives can include different functional groups or other hydrocarbon chains or groups.

The presence of a 4-membered ring in cyclobutane makes it a unique cycloalkane, and when one substituent is added to this ring, it forms a cyclobutane derivative. The specific nature of the substituent can vary, resulting in different compounds with diverse properties and reactivity.

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Answer:Atomic radius gets bigger

Explanation:

Atomic radius bigger because not only do the atoms have more and more protons and neutrons, and thus more mass in general, there is also stronger shielding affect. Shielding affect is when electrons closer to the nucleus block the positive charge from reaching electrons farther from the nucleus, and thus those far electrons are not drawn towards the nucleus as strongly, and spread out more, increasing atomic radius.

Answer:

I'm sorry, but I cannot see the observations or the data table you mentioned in your question. However, I can still provide you with some general guidance on how to approach the calculations and answer the questions based on the given information.

4. To calculate the concentration of the NaOH solution, you need to know the mass of NaOH used and the volume of the solution. The formula to calculate concentration is:

Concentration (in mol/L) = (Mass of NaOH (in grams) / molar mass of NaOH) / Volume of solution (in L)

Make sure to convert the mass of NaOH to moles by dividing it by the molar mass of NaOH. The molar mass of NaOH is the sum of the atomic masses of sodium (Na), oxygen (O), and hydrogen (H).

5. The balanced equation for the neutralization reaction between NaOH and HCl is:

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

(aq) represents an aqueous solution, and (l) represents a liquid.

6a. To calculate the average concentration of HCl in the sample from site B, you need to know the volumes and concentrations of the NaOH and HCl solutions used in the titration. Use the formula:

Concentration of HCl (in mol/L) = (Volume of NaOH solution (in L) * Concentration of NaOH (in mol/L)) / Volume of HCl solution (in L)

Multiply the volume of NaOH solution used by its concentration to find the amount of NaOH used. Then, divide this amount by the volume of HCl solution used to find the concentration of HCl.

6b. To determine the pH of the water at site B, you need to know the concentration of HCl from the previous calculation. The pH can be calculated using the formula:

pH = -log10[H+]

Since HCl is a strong acid, it dissociates completely into H+ ions. Therefore, the concentration of H+ ions is equal to the concentration of HCl. Take the negative logarithm (base 10) of the H+ concentration to find the pH.

To check if the water is safe, compare the calculated pH value to the range provided (pH 4.5-7.5). If the pH falls within this range, the water is considered safe for plant and animal reproduction in an aquatic environment.

6c. Use a similar calculation as in 6a to determine the average concentration of HCl in the sample from site C.

6d. Use the concentration of HCl from 6c to calculate the pH using the formula in 6b. Follow the same procedure to check if the water is safe based on the pH range.

7. To find the most current pH value for the Grand River, you can search for the latest data from reliable sources such as environmental agencies, research institutions, or government websites. Compare this pH value to the pH values obtained in the experiment to assess the difference between them.

Remember, without the specific data and observations, the calculations and comparisons provided here are only general guidelines. It's important to use the actual data from your experiment to obtain accurate results and conclusions.

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Answer:

The obtained result indicates that the hydrogen atom is not equal on both sides. Thus the reaction is not balanced.

Explanation:

Answer:

Force arrows are used to represent both the magnitude and direction of forces. The length of the arrow corresponds to the magnitude of the force, with longer arrows indicating forces with larger magnitudes. :) hope this helps

Explanation:

Answer: Venus is considered the closest planetary neighbor when measuring closest approach, but a new method called the point-circle method may indicate a different closest neighbor when taking time into consideration.

Explanation: Venus is traditionally considered the closest planetary neighbor to Earth due to its closest approach to our planet. However, a new method called the point-circle method, devised by researchers from the University of Alabama, takes time into consideration when measuring distances between planets. This method averages the distance between a bunch of points on each planet's orbit, which may indicate a different closest neighbor. However, this new method is not yet widely accepted and more research needs to be done to confirm its accuracy. It's important to define the term "closest neighbor" in context to avoid confusion.