Ocean water freezes at approximately -1.8 oC. How many grams of salt (Sodium Chloride) is in a sample of ocean water that is 2.62 kg?

Answer: it would be B

Answer:

A. would be your answer

thanks

The chemical formula for the ionic compound magnesium chlorate is \(Mg(ClO_{3} )_{2}\) i.e., option A is correct.

Metals and non-metals interact to produce ionic compounds. To get the closest configuration of a noble gas, an element can either acquire or lose electrons.

By either losing or gaining electrons, this aids in their stabilization after the completion of the octet. In order to complete their octet, non-metals often absorb electrons, whereas metals lose their electrons.

Here, the magnesium gives off 2 electrons and the chlorate ion (\(ClO_{3}\)) gives one electron to the magnesium chlorate, which is formed as a part of the reaction.

Therefore, the correct option is A, \(Mg(ClO_{3} )_{2}\).

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Answer: There are \(3.011 \times 10^{23}\) atoms present in 0.500 mol of \(CO_{2}\).

Explanation:

According to the mole concept, there are \(6.022 \times 10^{23}\) atoms present in 1 mole of a substance.

In a molecule of \(CO_{2}\) there is only one carbon atom present. Therefore, number of carbon atoms present in 0.500 mol of \(CO_{2}\) are as follows.

\(1 \times 0.500 \times 6.022 \times 10^{23}\\= 3.011 \times 10^{23}\)

Thus, we can conclude that there are \(3.011 \times 10^{23}\) atoms present in 0.500 mol of \(CO_{2}\).

The majority of valence electrons are negatively charged particles, and they are all grouped in various orbitals or shells. Additionally, these electrons are in charge of how atoms interact with one another and create chemical bonds.

An element is defined as the pure substance which consists of only one type of atom which all have the same numbers of protons in their nuclei. Elements are the simplest chemical forms which cannot be broken down through chemical reactions.

Here the element potassium has the atomic number 19 and its electronic configuration is 2, 8, 8, 1. It contains the four energy levels, they are 'K', 'L', 'M' and 'N'. The number of valence electrons in potassium is 1.

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

Which element has 1 valence electron and 4 energy levels?

The endocrine system, producer of hormones which are chemical messengers work with the nervous system to control many different body functions such as metabolism and growth is True.

The endocrine system is a communication system that uses feedback loops to control distant target organs by controlling hormones secreted by internal glands of an organism directly into the circulatory system.

All endocrine systems in vertebrates are controlled neurally by the hypothalamus. Among the endocrine glands are: Two organs called the adrenal glands sit on top of the kidneys and secrete the stress hormone cortisol.  

The pituitary gland receives instructions from the hypothalamus in the lower middle brain about when to release hormones. The female reproductive system's ovaries, which release eggs and sex hormones.

Thus, the endocrine system, producer of hormones which are chemical messengers work with the nervous system to control many different body functions such as metabolism and growth is True.

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Answer:

a force is push or pull that act on object as a result of object interaction its surrounding.

Explanation:

\(\\ \tt\hookrightarrow C_{15}H_{32}+23O_2\longrightarrow 15CO_2+16H_2O\)

\(\\ \tt\hookrightarrow CO_2+CaO=CaCO_3\)

1) The balanced equation for the combustion of C15H32 (pentadecane) is:

C15H32 + 23O2 → 15CO2 + 16H2O

2) To test for the presence of carbon dioxide (CO2) in the products of the combustion of C15H32, one simple way is to bubble the gas through limewater (aqueous calcium hydroxide solution). When carbon dioxide is passed through limewater, it reacts with the calcium hydroxide to form a white precipitate of calcium carbonate according to the following chemical equation:

Ca(OH)2 + CO2 → CaCO3 + H2O

The formation of a white precipitate indicates the presence of carbon dioxide in the gas. Another way to test for the presence of carbon dioxide is to use a pH indicator, such as universal indicator or litmus paper. When carbon dioxide dissolves in water, it forms a weak acid called carbonic acid. This can be detected by observing a change in the color of the pH indicator. Carbon dioxide will turn universal indicator yellow or litmus paper red, indicating an acidic solution.

Answer: The pOH value is 2.

Explanation:

Given: \([H^{+}] = 9.9 \times 10^{-13} M\)

pH is defined as the negative logarithm of hydrogen ion concentration.

Hence, pH of the given solution is calculated as follows.

\(pH = -log [H^{+}]\\= - log (9.9 \times 10^{-13})\\= 12\)

The relation between pH and pOH is as follows.

pH + pOH = 14

Therefore, pOH is calculated as follows.

pH + pOH = 14

12 + pOH = 14

pOH = 14 - 12

= 2

Thus, we can conclude that the pOH value is 2.

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Gibbs free energy (G°) is a thermodynamic quantity that can be used to predict the spontaneity of a reaction. It is defined as G° = -RTlnK, where R is the gas constant, T is the temperature in kelvins, and K is the equilibrium constant.

For part (a) of your question, at 25°C (which is equivalent to 298.15 K), the value of G° for the autoionization of water can be calculated as follows:

G° = -RTlnKw

= -(8.314 J/mol·K)(298.15 K)ln(1.00×10^-14)

= 79.9 kJ/mol

For part (b) of your question, at 40°C (which is equivalent to 313.15 K), the value of G° for the autoionization of water can be calculated as follows:

G° = -RTlnKw

= -(8.314 J/mol·K)(313.15 K)ln(2.92×10^-14)

= 83.6 kJ/mol

(a) Autoionization of Water:In the autoionization of water, two water molecules react to produce a hydroxide ion (OH-) and a hydronium ion (H3O+), as shown:H2O(l) + H2O(l) ⇌ H3O+(aq) + OH-(aq)At 25°C, the equilibrium constant Kw is 1.0 × 10-14. Therefore, the standard Gibbs free energy change for the autoionization of water at 25°C is 74.2 kJ/mol.

Gibbs free energy change for the reaction can be calculated using the following equation:ΔG° = - RT ln KwWhere, ΔG° = standard Gibbs free energy changeR = universal gas constant = 8.314 J K-1 mol-1T = temperature in KelvinKw = ion-product constant = [H+][OH-] = 1.0 × 10-14Thus,ΔG° = - (8.314 J K-1 mol-1) × (298 K) × ln (1.0 × 10-14) = 74.2 kJ/molTherefore, the standard Gibbs free energy change for the autoionization of water at 25°C is 74.2 kJ/mol.

(b) At 40°C, the ion-product constant Kw is 2.9 × 10-14.ΔG° at 40°C can be calculated using the same formula. Thus,ΔG° = - (8.314 J K-1 mol-1) × (313 K) × ln (2.9 × 10-14) = 72.6 kJ/molTherefore, the standard Gibbs free energy change for the autoionization of water at 40°C is 72.6 kJ/mol.

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Answer:

Z negative

Explanation:

The negative charge shows that this is an electron. Electrons are present outside the nucleus of the atom and having negative charge. Usually represented by e-

Answer:

Only Z?

Explanation:

Answer:

C, Reactants rearrange to form new products

Explanation:

Answer:

Fossil fuels cause local pollution where they are produced and used, and their ongoing use is causing lasting harm to the climate of our entire planet. Nonetheless, meaningfully changing our ways has been very difficult.

The molar concentration of Al(OH)₃ in the solution is 1.61 M.

we need to calculate the number of moles of Al(OH)3 in the solution:

Number of moles of Al(OH)₃ = mass of Al(OH)3 / molar mass of Al(OH)3

Molar mass of Al(OH)₃ = (1 x atomic mass of Al) + (3 x atomic mass of O) + (3 x atomic mass of H)

Molar mass of Al(OH)₃ = (1 x 26.98 g/mol) + (3 x 16.00 g/mol) + (3 x 1.01 g/mol) = 78.00 g/mol

Number of moles of Al(OH)₃ = 62.7 g / 78.00 g/mol = 0.804 moles

Next, we need to calculate the volume of the solution in liters:

Volume of solution = 500.0 mL = 500.0 mL x (1 L/1000 mL) = 0.500 L

Finally, we can calculate the molar concentration of Al(OH)₃

Molarity = moles of solute/volume of solution in liters

Molarity = 0.804 moles / 0.500 L = 1.61 M

Therefore, the molar concentration of Al(OH)₃ in the solution is 1.61 M.

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The mass of water needed to absorb 456 J is 1.44 g

We'll begin by calculating the change in the temperature of the water.

Initial temperature of water (T₁) = 22.7 °C

Final temperature (T₂) = 98.3 °C

ΔT = T₂ – T₁

ΔT = 98.3 – 22.7

Heat absorbed (Q) = 456 J

Change in temperature (ΔT) = 75.6 °C

Specific heat capacity of water (C) = 4.184 J/gºC

Q = MCΔT

456 = M × 4.184 × 75.6

456 = M × 316.3104

Divide both side by 316.3104

M = 456 / 316.3104

Therefore, the mass of the water is 1.44 g

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Answer:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

Explanation:

Exothermic reaction is a reaction in which heat is released to surrounding. This is due to the fact that the heat content of the reactant is higher than the heat content of product thus producing a negative enthalpy change (ΔH) i.e

Enthalpy change = Heat of product – Heat of reactant

ΔH = Hp – Hr = negative

Considering the options given in the question above, the correct answer is:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

Answer:

A= Coconut oil, B= Water, C= Sea water

Explanation:

oil is dense, water will allow things to float, but not as well as sea water

Answer:

d.

Explanation:

i was think b at first but that doesnt really explain how it gets to the circulatory system so d because without the the regulation of the heart rate and oxgen rich blood the muscular system can do absolutely nothing

If you have your notes of the steps: like precipitation etc.. it should help you form a step by step phase change in raindrops.

Answer:

As a raindrop I would be in a body of water as a liquid. Slowly, the sun would heat me up until I evaporate. I would rise into the air as a gas and form a cloud as condensation. Then precipitation would occur. The temperature suddenly drops dramatically. I freeze and fall as a solid of ice.

I don't know if this is what you were looking for but I hope it helps.

Answer:

3.12 L

Explanation:

Given the R value that is supplied

      you will need to convert to atm from mm Hg    and C  to K

269 mm / 760 mm/atm = .354 atm

176 c = 449.15

PV = n RT

V = n RT / P    = .03 * .08206 * 449.15  / .354 = 3.12 L

An aqueous solution of 0.10 mol dm-3 AlCl3 will be acidic due to the presence of hydrated Al3+ ions and the resulting formation of hydronium ions.

When an ionic compound like AlCl3 dissolves in water, it dissociates into its constituent ions according to the following reaction:

AlCl3 (s) → Al3+ (aq) + 3Cl- (aq)

The aluminum ion, Al3+, has a very high charge-to-size ratio, which makes it highly polarizing. It can distort the electron cloud of water molecules and attract them towards itself, forming a hydrated Al3+ ion:

Al3+ (aq) + 6H2O (l) → [Al(H2O)6]3+ (aq)

The resulting hydrated ion is acidic, because the Al3+ ion acts as a Lewis acid, accepting a lone pair of electrons from one of the water molecules to form a hydronium ion, H3O+:

[Al(H2O)6]3+ (aq) + H2O (l) → [Al(H2O)5OH]2+ (aq) + H3O+ (aq)

The hydronium ion is what makes the solution acidic, because it can donate a proton to a base to form water. Therefore, an aqueous solution of 0.10 mol dm-3 AlCl3 will be acidic due to the presence of hydrated Al3+ ions and the resulting formation of hydronium ions.

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In the context of chromatography, silica and alumina are commonly used as stationary phases for the separation of compounds.

If you use silica for very nonpolar compounds, they will interact weakly with the polar silica surface, resulting in rapid elution and poor separation. On the other hand, using alumina for very polar compounds will lead to strong interactions between the polar compounds and the polar alumina surface, causing slow elution and potential co-elution of similar compounds, which can also result in poor separation. To achieve optimal separation, it's essential to match the polarity of the stationary phase with the polarity of the compounds being separated.

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Answer:

Al3+

Explanation:

Aluminium has an electronic configuration of 2, 8, 3 and the outermost valence electrons is +3 since it is a metal

Elements acquire positive or negative charges by losing or gaining electrons. The element which have 3+ charge among the options is boron (B) Hence, option B is correct.

Boron is 5th element in periodic table and it is classified into 13th group. Boron is a metalloid and shows properties intermediate to metals and non metals.

The electronic configuration of boron is K =2, N =3. Atoms lose or gain electrons as per their valency to become stable. According to octet rule atoms become stable when their valence shell get completely filled.

Boron have 3 electrons in its valence shell. If it donate these three electrons into an electronegative atom, its K shell become its valence shell and it is completely filled. Thus boron becomes stable.]

When atoms loses electrons they acquire positive charge and this charge is numerically equal to the number of electrons lost. Thus boron acquire 3 unit of positive charge by donating its 3 electrons. Hence, option B is correct.

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Your question is incomplete. But your complete question probably was :

Which element below would have a 3+ charge as an ion?

answer choices.

nitrogen (N).

boron (B).

silicon (Si).

argon (Ar)

The heat of formation (ΔHf) per mole of hydrogen fluoride is -273.3 kJ/mol while the H-F bond strength is 567.3 kJ/mol.

The heat of formation (ΔHf) is the enthalpy change that accompanies the formation of one mole of a substance from its constituent elements. This value is negative for exothermic reactions, which are spontaneous, and positive for endothermic reactions, which are non-spontaneous. When hydrogen fluoride is formed from hydrogen and fluorine, heat is released, resulting in a negative ΔHf value. The heat of formation of hydrogen fluoride per mole can be calculated using the following equation:

2H2(g) + F2(g) ⟶ 2HF(g)ΔHf = -273.3 kJ/mol

The H-F bond strength is the amount of energy required to break one mole of H-F bonds. This value can be calculated using the following equation:

HF(g) ⟶ H(g) + F(g)ΔH = 567.3 kJ/mol

In other words, the H-F bond strength is the enthalpy change that accompanies the dissociation of one mole of hydrogen fluoride into its constituent atoms. The energy required to break the bond between hydrogen and fluorine is 567.3 kJ/mol, which is a measure of the strength of the bond.

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Answer:

The formula mass of Na2S04 is 142.04 g/mol

Answer:

142.04 g/mol

Explanation:

the formula Na2SO4 means:two moles sodium (45.98g), one mile sulfur (32.06g), and four moles oxygen (64.00g) combine to form one mole of sodium surface (142.04g).

Answer:

37 %.

Explanation:

¡Hola!

En este caso, para el problema descrito, conocemos la corriente de entrada y la de salida del agua, por lo que podemos obtener el flujo de la corriente que contiene el zumo a la salida una vez el agua fue evaporada:

\(F_{sol}=11500kg/dia-3000kg/dia=8500 kg/dia\)

Luego, por medio de un balance de zumo de limón en el evaporador en el cual la cantidad que entra es igual a la que sale con sus respectivas concentraciones:

\(x_z^{entra}*11500kg/dia=x_z^{sale}*8500kg/dia\)

Como la concentración del zumo a la salida es del 50 % (0.50), la de entrada es:

\(x_z^{entra}=\frac{x_z^{sale}*8500kg/dia}{11500kg/dia} =\frac{0.50*8500kg/dia}{11500 kg/dia}\\ \\x_z^{entra}=0.37\)

Que es igual al 37%.

¡Saludos!

a. 63.13 g of silver bromide is formed. b. Potassium bromide is limiting, and silver nitrate is in excess. c. 0.56 g of potassium bromide is left over. d. The percent yield is 46.96%.

In this problem, we first need to determine which reactant is limiting and which one is in excess. To do this, we can calculate the amount of product that each reactant would produce if it were completely consumed. The reactant that produces less product is the limiting reactant, and the other reactant is in excess.

In this case, using the molar masses of the reactants and the stoichiometry of the balanced chemical equation, we find that silver nitrate would produce 108.22 g of silver bromide, while potassium bromide would produce only 63.13 g. Therefore, potassium bromide is limiting, and silver nitrate is in excess.

To determine the amount of excess reactant left over, we can use the amount of limiting reactant consumed in the reaction to calculate the amount of product formed, and then subtract this from the total amount of product formed. In this case, 29.12 g of potassium bromide is consumed, producing 63.13 g of silver bromide. Therefore, 92.67 g - 29.12 g = 63.55 g of potassium bromide is in excess, and 63.55 g - 63.13 g = 0.42 g of potassium bromide is left over.

Finally, to calculate the percent yield, we can divide the actual yield (14.77 g) by the theoretical yield (63.13 g) and multiply by 100%. This gives us a percent yield of 23.41%, but we need to divide by the stoichiometric coefficient of silver bromide (1) to get the percent yield based on silver bromide. Therefore, the percent yield based on silver bromide is 23.41%/1 = 23.41%. The percent yield based on silver nitrate or potassium bromide would be different, but they are not relevant for this problem.

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Answer:

c / a

correct me if im wrong

Answer:

D) 4 protons, 4 electrons, 5 neutrons

The common way is the use of active voice when writing an abstract because passive voice make an indirect writing of the action and indication of a person in the action.

Abstract is the first phase of a thesis or a publication in a journal. It briefly summarizes about what we are going tp communicate through that paper or thesis what are the major methods used and also tell about the major findings and conclusions.

Thus, abstract must be concise but sharp and clear to the point about each step in the experiment of the scientific investigation whatever. It must be following the same tense of action that is in past or present. All sentence should follow the same tense.

Now, it is commonly better to avoid passive voice to write the actions and if possible write it in active voice. Direct indication of the person in charge and the action is good to read.

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A neutral nucleophile such as ammonia (NH₃) can be used to make CH₃CONH₂.

To make CH₃CO₂COCH₃ from acetyl chloride (CH₃COCl), a negatively charged nucleophile such as sodium acetate (CH₃COO⁻ Na⁺) can be used. The reaction would be:

CH₃COCl + CH₃COONa → CH₃CO₂COCH₃ + NaCl

To make CH₃CONH₂ from acetyl chloride (CH₃COCl), a neutral nucleophile such as ammonia (NH₃) can be used. The reaction would be:

CH₃COCl + NH₃ → CH₃CONH₂ + HCl

A neutral nucleophile is a molecule or atom that can donate a pair of electrons to form a new covalent bond with another molecule or atom without carrying an overall positive or negative charge.

Neutral nucleophiles typically have a lone pair of electrons that they can use to form a new bond, and they do not react as readily as charged nucleophiles.

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