when a 4.98 g of NaOH was dissolved in 49.72g of water in a calorimeter at 23.7 c, the temperature of the solution went up to 50.1 c

1.) calculate qh2o

2.) find delta H for the reaction as itoccured in the callorimeter using this equation: q reaction= delta h reaction = qh20

3.) find delta h for the dissolution of 1.00 g NaOH in water

4) find delta H for the dissolution of 1 mole in NaOH in water

5) given that NAaOh exists as Na+ and OH- ions in solution, write the equation for the reaction that occurs when NaOH is dissolved in water.

Answer:15.9994 g/mol

Explanation:

Answer:

Gold is different than other because they are homogenous mixture.

The proper way to clean a crucible and lid is as follows

Allow the crucible and lid to cool completely before handling them. Once cooled, use a brush to remove any loose debris or residue from the crucible and lid. Rinse the crucible and lid with distilled water to remove any remaining residue. Dry the crucible and lid thoroughly with a clean cloth or paper towel. Store the crucible and lid in a clean, dry place until they are needed again.

It is important to always handle the crucible and lid with care and to avoid using any abrasive or harsh cleaning agents, as these can damage the surface of the crucible and lid. Always follow any specific cleaning instructions provided by the manufacturer of the crucible and lid.

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The possible ion that has the configuration 1s²2s²2p⁶3s²3p⁶ is Chlorine Ion.

The given electronic configuration is 1s²2s²2p⁶3s²3p⁶.

First let us count the number of electrons in this atom.

The number of electrons are (2+2+6+2+6)

Total electrons = 18 electrons.

As we can see,

The outermost orbital 3p6 is full. It can only accept one electron.

It means that in the ground state.

The configuration of the species should have been,

1s²2s²2p⁶3s²3p⁵.

Now, as per the electronic configuration. The atom is chlorine.

So, the ion with the given electron configuration should must be chlorine ion.

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5.2 mol H₂O

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Stoichiometry

Step 1: Define

[RxN - Balanced] 6HCl + Fe₂O₃ → 2FeCl₃ + 3H₂O

[Given] 10.4 mol HCl

Step 2: Identify Conversions

[RxN] 6 mol HCl = 3 mol H₂O

Step 3: Stoichiometry

Answer:

The fly cells must be compared with human cells

Explanation:

Dr. Gracia's aim is the development of a potential cancer treatment. Remember that the treatment is meant for human beings.

Usually, the pre-clinical trials of the treatment is carried out on other organisms and the success rate is evaluated before trial on humans.

If protein W has been effective on flies, its effect on human cells should also be diligently compared before conclusions are drawn regarding the therapeutic effects of protein W.

1. The differential equation satisfied by y(t) is:  dy/dt = 0.6 kg/min

The amount of salt in the tank after t minutes can be represented by the function y(t). We need to find the differential equation that y satisfies.
Initially, the tank contains 100 L of pure water, which means there is no salt in the tank. As time passes, a solution with a salt concentration of 0.3 kg/L is added at a rate of 7 L/min. The salt concentration in the tank will increase with the addition of this solution.
At the same time, the solution is drained from the tank at a rate of 5 L/min. This will result in a decrease in the salt concentration in the tank.
To find the differential equation satisfied by y(t), we need to consider the rate of change of salt in the tank.
Rate of change of salt in the tank = Rate of salt added - Rate of salt drained
The rate of salt added is given by the product of the concentration of the solution (0.3 kg/L) and the rate at which the solution is added (7 L/min). So, the rate of salt added = 0.3 kg/L * 7 L/min.

The rate of salt drained is given by the product of the concentration of the solution (0.3 kg/L) and the rate at which the solution is drained (5 L/min). So, the rate of salt drained = 0.3 kg/L * 5 L/min.

Therefore, the differential equation satisfied by y(t) is:
dy/dt = (0.3 kg/L * 7 L/min) - (0.3 kg/L * 5 L/min)

Simplifying the equation:
dy/dt = 2.1 kg/min - 1.5 kg/min
dy/dt = 0.6 kg/min

So, the differential equation satisfied by y(t) is:
dy/dt = 0.6 kg/min

2. The amount of salt in the tank after 40 minutes is 24 kilograms.

To find the amount of salt in the tank after 40 minutes, we can solve the differential equation.

dy/dt = 0.6 kg/min

Integrating both sides with respect to t:
∫dy = ∫0.6 dt

Integrating, we get:
y = 0.6t + C

To find the value of C, we can use the initial condition that the tank initially contains 100 L of pure water, which means there is no salt. So, at t = 0, y = 0.

Substituting these values into the equation:
0 = 0.6(0) + C
C = 0

Therefore, the equation becomes:
y = 0.6t

Now, we can find the amount of salt in the tank after 40 minutes by substituting t = 40 into the equation:
y = 0.6(40)
y = 24 kg


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Answer:

Ca = 1s²2s²2p⁶3s²3p⁶4s²

Explanation:

Calcium is located in the second column and the 4th row of the periodic table. Thus, there are 2 valence electrons and the highest quantum number is 4. This is represented by 4s². However, all of the previous orbitals and electrons must be listed beforehand, making the entire electron configuration: 1s²2s²2p⁶3s²3p⁶4s².

From the fact that the bond order would reduce from one to 0.5, it shows that the ionized specie is weaker than the hydrogen molecule that has not yet been ionized.

The term bond strength has to do with how strong the bond that holds two atoms together is. We know that the stronger the bond, the more difficult it would be to break the bond by whatever means.

In this case, we are told that when we ionize the hydrogen molecule, the strength of the bond is changed. This implies that the bond would become weaker as the bond order of the specie would reduce from one to 0.5.

Also, the lesser the bond order, the weaker the molecule is. It then follows that the hydrogen molecule that has not been ionized with a bond order of one has a stronger bond than the ionized specie that has a bond order of 0.5.

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Answer: electrostatic force

Explanation:

Oppositely charged particles attract each other. This attractive force is often referred to as an electrostatic force. An ionic bond is the electrostatic force that holds ions together in an ionic compound

Silver bromide is stored in a brown colour thick glass bottle in order to regulate the amount of light that enters it.

Silver bromide is an inorganic compound; the silver salt of hydrobromic acid, AgBr, sometimes used in photographic papers.

Silver bromide is a photosensitive chemical compound that easily undergoes photolytic breakdown. It quickly interacts with light and loses its characteristic by generating bromine gas and silver.

Silver bromide tends to decompose when light falls on it. In order to prevent this, dark colored bottles are used as they restrict the amount of light entering the bottle.

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Answer:

I think they have high, because the nonpolar molecules usually have a much lower surface tension than polar ones.

Answer:

No, all liquids do not evaporate at the same rate.

Explanation:

The rate of evaporation depends on several factors, including the strength of intermolecular forces, temperature, surface area, and atmospheric pressure.

Intermolecular forces refer to the attractive forces between the molecules of a liquid, which can affect the rate of evaporation. Liquids with weaker intermolecular forces tend to evaporate more quickly because less energy is required to overcome the attractive forces between the molecules. For example, acetone has weaker intermolecular forces than water and therefore evaporates more quickly than water.

Temperature also affects the rate of evaporation. As the temperature of a liquid increases, the kinetic energy of the molecules increases, and more molecules have enough energy to escape into the gas phase. Therefore, liquids at higher temperatures tend to evaporate more quickly than those at lower temperatures.

The surface area of the liquid also plays a role in the rate of evaporation. Liquids with larger surface areas exposed to the air tend to evaporate more quickly than those with smaller surface areas.

Finally, atmospheric pressure affects the rate of evaporation. At higher altitudes where atmospheric pressure is lower, liquids tend to evaporate more quickly because there is less atmospheric pressure pushing down on the liquid, making it easier for molecules to escape into the gas phase.

In summary, the rate of evaporation depends on several factors, including the strength of intermolecular forces, temperature, surface area, and atmospheric pressure, and therefore, not all liquids evaporate at the same rate.

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Answer:

C

Explanation:

Actually, arranged to the size of smallest to least atom radius size = C

Atomic sizes generally get smaller as you go from L to R across a row of the periodic table.

Answer:

Visible light spectrum is a part of electromagnetic waves.  The colors of the visible light spectrum are organised on the basis of their wavelength and frequency.

As the light or color having high frequency will have the shorter wavelength and vice versa, so  colors in visible light spectrum arranged from highest frequency to lowest frequency or from shortest wavelength to highest wavelength. For example: The highest frequency color is violet and lowest frequency of visible light is red.

The explanation regarding the colors of the visible light spectrum is to be explained below:

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According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;

where;

V1 and V2 are the initial and final volume of the gas

T1 and T2 are the initial and final temperatures of the gas (in Kelvin)

Given the following parameters:

Substitute the given parameters into the formula;

Therefore the volume of the gas at 20°C is approximately 97.67cm³

Answer:

Unbalanced

Explanation:

The reactants side says 2Na. This means there should also be 2Na on the product's side. However, there is only 1 Na there. Therefore, the chemical equations are unbalanced.

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Answer:Therefore, there are approximately 2.38 moles of nitrogen gas inside the fully inflated airbag

Explanation:

To calculate the number of moles of nitrogen gas inside the fully inflated airbag, we can use the Ideal Gas Law:

PV = nRT

where P is the absolute pressure of the gas (in atmospheres), V is the volume of the gas (in liters), n is the number of moles of gas, R is the universal gas constant (0.08206 L atm/mol K), and T is the temperature of the gas (in Kelvin).

We know that the volume of the airbag is 58 liters and the absolute pressure is 1.30 atmospheres (which includes the atmospheric pressure of 1 atmosphere). We also know that the temperature inside the airbag is likely to be close to the ambient temperature, which we can assume is around 25°C or 298 K.

So, we can rearrange the Ideal Gas Law to solve for n:

n = PV/RT

n = (1.30 atm * 58 L) / (0.08206 L atm/mol K * 298 K)

n = 2.38 moles

Therefore, there are approximately 2.38 moles of nitrogen gas inside the fully inflated airbag.

Answer:

The reason is carbon's ability to form stable bonds with many elements, including itself. 

Explanation:

This property allows carbon to form a huge variety of very large and complex molecules. In fact, there are nearly 10 million carbon-based compounds in living things!

Answer:

Explanation:

The reason is that carbon is able to form stable bonds with many elements, including itself, which allows carbon to form a huge variety of very large and complex molecules.

0.72 moles of hydrochloric acid are needed to completely react with 0.36 moles of lead, based on the mole ratio obtained from the balanced chemical equation.

The given chemical equation shows the reaction of lead with hydrochloric acid to produce lead(II) chloride and hydrogen gas. The coefficients of the reactants and products in the balanced chemical equation indicate the mole ratios of the reactants and products.

According to the equation, 1 mole of lead reacts with 2 moles of hydrochloric acid to produce 1 mole of lead(II) chloride and 1 mole of hydrogen gas.

Therefore, to calculate the amount of hydrochloric acid needed to react completely with 0.36 moles of lead, we can use the mole ratio obtained from the balanced chemical equation.

Since 1 mole of lead reacts with 2 moles of hydrochloric acid, we can say that 0.36 moles of lead would react with 2 x 0.36 = 0.72 moles of hydrochloric acid. Therefore, 0.72 moles of hydrochloric acid are needed to completely react with 0.36 moles of lead.

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Since Potassium atom is made up of 19 electrons, that is, its atomic number is 19; therefore the electronic configuration that represents potassium in an excited state is 1s²2s²2p⁶3s²2p⁶4s⁰4p¹

The electron configuration that represents an excited state for a potassium atom is 2-8-7-1. Option (1) is correct.

Potassium is a chemical element with the symbol K (from Neo-Latin kalium) and atomic number 19. The electron configuration of potassium is 1s²2s²2p⁶3s²3p⁶4s¹.

The excited state of potassium would be when one of the 4s electrons jumps to a higher energy level (orbital) such as 4p, 5s, 5p, etc. resulting in an electron configuration of 2-8-7-1.

So, the option (1) 2-8-7-1 represents the excited state for a potassium atom.

The distribution of electrons in an element's atomic orbitals is described by its electron configuration. Atomic electron configurations follow a standard notation in which all electron-containing atomic subshells are arranged in a particular order, with the number of electrons they hold written in superscript.

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The pressure exerted by the mixture of gases would be 4.4 atm.

To find the pressure exerted by the mixture of gases, we can use the ideal gas law: PV = nRT

where P is pressure in atmospheres, V is volume in liters, n is number of moles of gas, R is ideal gas constant (0.0821 L atm/mol K), and T is the temperature in Kelvin.

First, we need to calculate the total number of moles of gas in the mixture. To do this, we will use the formula:

n = m/M

where n is number of moles, m is mass in grams, and M is the molar mass in grams/mole.

For O₂:

n(O₂) = 3.2 g / 32 g/mol = 0.1 mol

For CH₄:

n(CH₄) = 6.4 g / 16.04 g/mol = 0.4 mol

For SO₂:

n(SO₂) = 6.4 g / 64.06 g/mol = 0.1 mol

The total number of moles of a gas will be:

n(total) = n(O₂) + n(CH₄) + n(SO₂) = 0.1 mol + 0.4 mol + 0.1 mol = 0.6 mol

Next, we need to calculate the total volume of the mixture of gases. We are given that the volume is 3.5 L, so we can use the formula:

V = nRT/P

Solving for P, we get:

P = nRT/V

Substituting the values we have:

P = (0.6 mol)(0.0821 L atm/mol K)(298 K)/(3.5 L)

= 4.4 atm

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--The given question is incomplete, the complete question is

"What pressure would a mixture of 3.2 grams of 02, 6.4 grams of ch4, and 6.4 grams of so2 exert if the gases were placed in a 3.5L."--

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 15 g

volume = 3 mL

We have

\(density = \frac{15}{3} = 5 \\ \)

We have the final answer as

Hope this helps you.

The SQL query below retrieves all the data in the PRODUCT table.SELECT * FROM PRODUCT;

SQL stands for Structured Query Language and is a programming language used to manage relational databases. SQL is used to execute a variety of operations on a database, such as inserting data, updating existing data, and deleting data.

SQL is used to communicate with a database and is the standard language for managing databases. SQL is used to interact with databases such as MySQL, Oracle, MS SQL Server, SQLite, etc.

PRODUCT is the name of a table in a database that stores product information. The PRODUCT table contains information about a company's products, such as product codes, names, descriptions, and prices. SQL is used to perform operations on the PRODUCT table such as SELECT, INSERT, UPDATE, and DELETE.SQL QueryThe SQL query to select all data in the PRODUCT table is:SELECT * FROM PRODUCT; the

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Answer:

I'm pretty sure is a mixture

The reaction would proceed in reverse direction. At equilibrium, the concentration of fructose-6-phosphate is 0.5 M, while the concentration of glucose-6-phosphate is 1 M. The free energy change (ΔG) of the isomerization of glucose-6-phosphate to fructose-6-phosphate at 25°C is approximately 3.86 kJ/mol.

The equilibrium constant (Kc) of the isomerization of glucose-6-phosphate to fructose-6-phosphate is 0.5, which means that the reaction would tend to proceed in the reverse direction and the concentration of glucose-6-phosphate would be higher than that of fructose-6-phosphate at equilibrium. Given an initial concentration of 1 M of glucose-6-phosphate and 0 M of fructose-6-phosphate, the concentration of fructose-6-phosphate at equilibrium can be calculated using the equilibrium constant as follows: 0.5 = [Fructose-6-phosphate] / 1, giving [Fructose-6-phosphate] = 0.5 M. The change in free energy (ΔG) of the reaction can be calculated using the equation ΔG = -RT ln Kc, where R is the gas constant (8.31 J/mol·K) and T is the temperature in Kelvin. At 25°C (298 K), ΔG = -(8.31 J/mol·K)(298 K) ln 0.5 = 3.86 kJ/mol.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 12 g

volume = final volume of water - initial volume of water

volume = 18.5 - 14 = 4.5 mL

So we have

\(density = \frac{12}{4.5} \\ = 2.66666666...\)

We have the final answer as

Hope this helps you

The two substances can never be separated by distillation because distillation depends on difference in boiling point.

Distillation is a separation method that depends on difference in boiling point between two substances.

Usually, the substance having a lower boiling point is collected first as the temperature is gradually raised. The substance having a higher boiling point then follows.

However, since the two substances have the same boiling point, they can not be separated by distillation because they will be converted to vapor simultaneously thereby making separation impossible.

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Answer:

0.054 moles

Explanation:

It is the rounded off answer.