Write the molecular formulae of any 2 compounds that can be formed by the
combination of following ions.
Al3+ Na+Cl- So43-

In the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.

An atomic model is a graphic representation and/or diagram used to identify the components of atoms.

An atomic model may have into account all its components (i.e., electrons, protons, and neutrons).

In conclusion, in the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.

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When a 13.9 g sample of solid sodium hydroxide (NaOH) dissolves in 250.0 g of water in a coffee-cup calorimeter initially at 23.0 °C, the final temperature of the solution is approximately 4.0 °C.

To find the final temperature of the solution, we can use the principle of conservation of energy. The heat gained by the water will be equal to the heat lost by the solid sodium hydroxide.

First, let's calculate the heat gained by the water:

Heat gained by water = (mass of water) × (specific heat of water) × (change in temperature)

mass of water = 250.0 g

specific heat of water = 4.18 J/g·K

change in temperature = (final temperature - initial temperature)

Next, let's calculate the heat lost by the sodium hydroxide:

Heat lost by sodium hydroxide = (mass of NaOH) × (enthalpy change per mole)

mass of NaOH = 13.9 g

enthalpy change per mole = -44.4 kJ/mol

Since we are given the mass of NaOH in grams, we need to convert it to moles:

moles of NaOH = (mass of NaOH) / (molar mass of NaOH)

The molar mass of NaOH is 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 39.00 g/mol

Now we can calculate the heat gained by the water and the heat lost by the sodium hydroxide:

Heat gained by water = (250.0 g) × (4.18 J/g·K) × (final temperature - 23.0 °C)

Heat lost by sodium hydroxide = (13.9 g / 39.00 g/mol) × (-44.4 kJ/mol)

Since the heat gained by the water is equal to the heat lost by the sodium hydroxide, we can set up an equation:

(250.0 g) × (4.18 J/g·K) × (final temperature - 23.0 °C) = (13.9 g / 39.00 g/mol) × (-44.4 kJ/mol)

Simplifying the equation:

(4.18 J/g·K) × (final temperature - 23.0 °C) = (-13.9 g / 39.00 g/mol) × (44.4 kJ/mol)

Now we can solve for the final temperature:

(final temperature - 23.0 °C) = [(-13.9 g / 39.00 g/mol) × (44.4 kJ/mol)] / (4.18 J/g·K)

(final temperature - 23.0 °C) ≈ -19.0 °C

Finally, we can calculate the final temperature of the solution:

final temperature ≈ -19.0 °C + 23.0 °C

final temperature ≈ 4.0 °C

Therefore, the final temperature of the solution is approximately 4.0 °C.

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From the concept of electrolysis, 34.6632 grams of Cr would plate out from a solution of Cr(NO3)3 when 1.93 × 10^5 coulombs of charge are passed through the solution.

Electrolytic reaction is a process in which electrical energy is used to drive a non-spontaneous chemical reaction. It is used to extract metals from their ores that cannot be obtained by the reduction with carbon. The process involves electrolysis where the electrolyte is a solution containing ions of the metal to be extracted. The metal ions are reduced by electrons from the electrical circuit onto the cathode, forming a solid metal.

Molar mass of Cr = 52.00 u

The equation for the reduction of Cr3+ ions is given as follows: Cr3+ + 3e- → Cr

We can see from the equation that it takes 3 moles of electrons to plate out 1 mole of Cr. Therefore, the number of moles of electrons needed to plate out Cr can be calculated as follows:

Number of moles of electrons = 1.93 × 10^5 / 96500 = 1.9997 mol

We can use the mole ratio of Cr to electrons to find out how many moles of Cr would be plated out. Number of moles of Cr = Number of moles of electrons / Mole ratio of Cr to electrons. Number of moles of Cr = 1.9997 / 3 = 0.6666 mol. We can use the following formula to calculate the mass of Cr that would be plated out:

Mass = Number of moles × Molar mass

          = 0.6666 × 52.00

          = 34.6632 g.

Therefore, approximately 34.6632 grams of Cr would plate out from a solution of Cr (NO3)3 when 1.93 × 10^5 coulombs of charge are passed through the solution.

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The units of measurement that can be used for precipitation with mm or inches is precipitation, and air temperature.

The Temperature is known to be how hot or cold the air or atmosphere is. It is often measured by the used of a thermometer (in Celsius (C) or Fahrenheit (F), or Kelvin (K) ).

The unit of measurement for precipitation is said to be in millimeters. The unit is known to be in linear depth, that is in millimeters (for volume/area), or in kg m–2 (for the mass/ area).

See full question below

A is air pressure and is a temperature

O A is humidity and precipitation

O A is precipitation, and B is air temperature

O A is wind speed, and B is humidity

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Answer:

Matter can exist in one of three main states: solid, liquid, or gas.

Solid matter is composed of tightly packed particles.

Liquid matter is made of more loosely packed particles.

Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.

Explanation:

Answer:

Exhalation by animals in the form of carbonate in air to form carbon dioxide gas in the atmosphere

Explanation:

This is because, carbon in the environment are being oxidized by the respiratory processes of animals in the carbon cycle into Carbon dioxide gas

If 250 mL of methane (CH4) effuses through a small hole in 48 s, the time required for the same volume of helium to pass through the hole is approximately 96 s.

The effusion rate of a gas is inversely proportional to the square root of its molar mass, according to Graham's law of effusion. In this case, we need to compare the effusion rates of methane and helium.

Since the volume is constant, we can use the ratio of their times of effusion.

Let's assume the molar mass of methane (CH4) is M1 and the molar mass of helium (He) is M2. According to Graham's law, the ratio of the effusion times is given by:

(time for methane) / (time for helium) = √(M2 / M1)

Given that the time for methane is 48 s, we need to find the time for helium. Rearranging the equation, we have:

(time for helium) = (time for methane) / √(M2 / M1)

By substituting the molar masses of methane (16.04 g/mol) and helium (4.00 g/mol), we can calculate:

(time for helium) = 48 s / √(4.00 g/mol / 16.04 g/mol)

(time for helium) = 48 s / √(0.25)

(time for helium) = 48 s / 0.5

(time for helium) = 96 s

Therefore, the time required for the same volume of helium to pass through the hole is approximately 96 seconds.

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The molality of a solution containing 5.2 g of urea is 0.56 m (molar mass = 60 g/mol) in 250 g of benzene (\(C_{6}H_{6}\)) is 0.35 m.

We are given:

Using the mass and molar mass of urea, the number of moles of urea is:

\(n_{urea}\) = mass of urea ÷ molar mass of urea

= 5.2 g ÷ 60g/mol

= 0.087 mol

The molality of the solution is expressed as follows:

Molality = moles of urea ÷ kilogram of benzene

Now solving the above equation and gives:

Molality = (0.087 mol ÷ 250 g) × (1000 g ÷ 1 kg)

= 0.348 mol/kg

≈ 0.35 m

Hence, the molality of the solution is 0.35 m.

Your question is incomplete, but most probably your full question was

What is the molality of a solution that contains 5.2 g of urea (molar mass = 60 g/mol) in 250 g benzene (\(C_{6}H_{6}\))?

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Answer

47.73 g CuO

Explanation

Given:

Chemical equation: 3CuO+ 2H3PO4 = Cu3(PO4)2 + 3H20

mass of orthophosphate acid (Cu3(PO4)2) = 39.2 g

Required: The mass of CuO

Solution:

Second method:

Step 1: Find the moles of H3PO4

n = m/M where m is the mass and M is the molar mass of H3PO4

n = 39.2g/97.994g.mol^-1

n = 0.400 mol

Step 2: Use the stoichiometry to find the moles of CuO

The molar ratio between CuO and H3PO4 is 3:2

Therefore the moles of CuO = 0.400 mol x (3/2) = 0.600 mol

Step 3: Find the mass of CuO, now that we have moles

m = n x M m is the mass, n is the moles and M is the molar mass

m = 0.600 mol x 79,545 g/mol

m = 47.73 g

The volume of CO2 at STP =124.298 L

Given

Reaction

4 KMnO4, +4 C3H5(OH)5, -7K2CO3, + 7 Mn2O3, +5 CO2, + 16 H2O

701,52 g of KMnO4

Required

volume of CO2 at STP

Solution

mol KMnO4 (MW=158,034 g/mol) :

mol = mass : MW

mol = 701.52 : 158.034

mol = 4.439

mol CO2 from equation : 5/4 x mol KMnO4 = 5/4 x 4.439 = 5.549

At STP 1 mol = 22.4 L, so for 5.549 moles :

=5.549 x 22.4

=124.298 L

The probability that the shipment came from Ghana is approximately 48.78%.

To calculate the probability that the shipment came from Ghana, we can use Bayes' theorem. Let's denote the event that the shipment came from Ghana as G and the event that the shipment came from a neighboring country as N. We want to find P(G|I), the probability that the shipment came from Ghana given that one vial is ineffective.

Calculate the probability of selecting an ineffective vial from Ghana's shipments.

P(I|G) = 0.10 (10% of the vials from Ghana are ineffective)

Calculate the probability of selecting an ineffective vial from neighboring countries' shipments.

P(I|N) = 0.02 (2% of the vials from neighboring countries are ineffective)

Calculate the probability that a shipment came from Ghana, given that one vial is ineffective.

P(G|I) = (P(I|G) * P(G)) / [(P(I|G) * P(G)) + (P(I|N) * P(N))]

        = (0.10 * 0.20) / [(0.10 * 0.20) + (0.02 * 0.80)]

        ≈ 0.0488

Therefore, the probability that the shipment came from Ghana is approximately 48.78%.

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If the bromobenzene is added too quickly, biphenyl is formed as the side product with the Grignard reagent.

What is Grignard reagent?

Grignard reagent is an organomagnesium halide which has the formula RMgX where R is alkyl or aryl group, Mg is magnesium, X is an halide.

When bromobenzene is added too quickly to the Grignard reagent, biphenyl is formed as a by-product. the formation of the side product is enhanced by high temperature. So, this reaction is carried out in low temperature.

Therefore, biphenyl is formed as side product when bromobenzene is added quickly to the Grignard reagent. The structure of biphenyl is two benzene rings joined together.

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Several reasons can contribute to a high percentage inaccuracy in a calorimetry lab. Among the most prevalent reasons are:

Inadequate stirring: The heat transmission between the reaction mixture and the calorimeter is not homogeneous and constant, resulting in temperature change measurement inaccuracies.

Temperature measurement that is inaccurate: The temperature measuring instruments employed, such as thermometers or temperature probes, may have a high degree of measurement error or are not correctly calibrated.

Heat loss to the environment: If the calorimeter is not well-insulated, heat may be lost to the environment, resulting in mistakes in temperature change measurement.

Incomplete reaction: The heat of reaction may not be reliably evaluated if the reaction is not completed.

Calorimetry is the study or act of measuring changes in state variables of a body with the goal of determining the heat transfer associated with changes in its state caused by chemical reactions, physical changes, or phase transitions under defined limits in chemistry and thermodynamics. Calorimetry is the measurement of the quantity of heat transmitted to or from a material. To do this, heat is exchanged with a calibrated item (calorimeter). The quantity of heat transmitted by the process under investigation is calculated using the temperature change observed by the calorimeter.

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Answer:

132.53 J/kg.°C

Explanation:

Applying,

Q = cm(t₂-t₁)................ Equation 1

Where Q = amount of heat, c = specific heat capacity of platinum metal, m = mass of platinum metal, t₁ = initial temperature, t₂ = Final temperature.

Make c the subeject of the equation

c = Q/m(t₂-t₁).............. Equation 2

From the question,

Given: Q = 5.7 J. m = 18.7 g = 0.0187 kg, t₁ = 21.2°C, t₂ = 23.5°C

Substitute these values into equation 2

c = 5.7/[0.0187×(23.5-21.2)]

c = 5.7/0.04301

c = 132.53 J/kg.°C

Answer: The answer is D,

the oxygen atom

Explanation:

Water is a molecular compound consisting of polar molecules that have a bent shape. The oxygen atom acquires a partial negative charge while the hydrogen atom acquires a partial positive charge.

Answer:

Carbon

Explanation:

oxygen is more electronegative than carbon, the electrons will spend more time around the oxygen atom giving it a partially negative charge while the carbon will become partially positive. Some atoms retain lone (unbonded) pairs of electrons when they are part of a covalent complex.

Answer:

Cu

Explanation:

The carbor-14 (C14) has 8 neutrons.

How to calculate the neutrons?

Neutrons can be calculated by using the mass number and atomic number.

Neutrons = mass number - atomic number.

As given,

Carbon atomic number is 6 and carbon mass number is 14.

Apply formula,

neutrons = mass number - atomic number

neutrons = 14 - 6

               = 8

Therefore, carbor-14 (C14) has 8 neutrons.

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When an oil is partially hydrogenated, one or more of its double bond configurations can change from cis to trans.

During the process of partial hydrogenation, the unsaturated fatty acids in the oil are treated with hydrogen gas and a catalyst to turn some of the double bonds into single bonds.

This process also converts some of the cis bonds to trans bonds, which can have negative health effects when consumed in large quantities.

Trans-fats are created by partial hydrogenation of vegetable oils.

They have been shown to be linked to heart disease and other health problems.

Since trans-fats can increase LDL (bad) cholesterol and decrease HDL (good) cholesterol, it is important to limit your intake of them.

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Answer:

C) protons and neutrons

Explanation:

im pretty sure it is c

what do you mean by this comment and ill tell you the answer there

Answer:

Water can dissolve any substance that contains charged particles (ions) or ... essential molecules within the bloodstream will depend on their solubility in water. Water serves to suspend the red blood cells to carry oxygen to the cells. It is the solvent for the electrolytes and nutrients needed by the cells, and also the solvent to carry waste material away from the cells. Water-based solutions like blood help carry molecules to the necessary locations. Thus, water's role as a solvent facilitates the transport of molecules like oxygen for respiration and has a major impact on the ability of drugs to reach their targets in the body.

Explanation:

What Renata has granted to the manufacturer of the colored hair dye is called a patent.

A patent is a right given to a manufacturer to be the sole producer of a product for a given period of time. Usually, the patent has to last for a given number of years after which the technology becomes commonplace.

Hence, what Renata has granted to the manufacturer of the colored hair dye is called a patent.

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Answer: 0.942 moles of NaCl

Explanation:

for every 2 moles of Na3PO4 that react, 6 moles of NaCl form

therefore, to find how many moles of NaCl for we use this formula:

0.314 moles Na3PO4 * (6/2) = 0.942 moles of NaCl

Answer:

Long range

Explanation:

A. But not too sure

Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore, the correct option is option D.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation ion  is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. Sulfur (S) exist as S⁻² as ion which is similar to O²⁻.

Therefore, the correct option is option D.

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Answer:

a

Explanation:

It's either B. mutating to survive or D. natural selection. I'm just going off what I remember in the lesson. I strongly think D. natural selection though. If I'm wrong I'm sorry.

Answer:

It can use a small amount of sunlight for photosynthesis

Explanation:

Seaweeds are a group of marine plants/algae that grow attached to rocks underwater. However, despite their depth underwater, they still perform photosynthesis, which is a process that requires energy from sunlight.

Seaweeds are able to perform photosynthesis underwater because they are efficient users of sunlight energy. Hence, they require only a small amount of sunlight that penetrates the ocean to perform photosynthesis.

Answer:

0? because they didn't mention anything about that

2.50 litres of a 10.0 M solution require the preparation of 25.0 moles of ethylene glycol.

Excellent antifreeze, anti-boil, and anti-corrosive qualities are produced when antifreeze and water are mixed in a 50/50 ratio. The proportion of conventional ethylene glycol to water in severely cold conditions can reach 70% antifreeze, 30% water. The maximum antifreeze to water ratio when using DEX-COOL® is 60/40.

moles = concentration (M) x volume (L)

Given that the desired concentration is 10.0 M and the volume needed is 2.50 L, the setup for calculating the total number of moles of ethylene glycol can be written as:

moles = 10.0 M x 2.50 L

moles = 25.0 mol

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Upon adding a drop of potassium thiocyanate to a solution of iron(III) chloride, a reddish-brown coloration forms.

When a drop of potassium thiocyanate is added to a solution of iron(III) chloride, a chemical reaction occurs between the two compounds. The iron(III) chloride, which is an orange-brown solution, reacts with potassium thiocyanate to form a complex ion called iron(III) thiocyanate.

This complex has a reddish-brown color, giving the solution its characteristic color change.  The formation of the reddish-brown color indicates the presence of the iron(III) thiocyanate complex and confirms the reaction between potassium thiocyanate and iron(III) chloride.

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