The following table lists molar concentrations of seven major ions in seawater. Using a density of 1.022 g/ml. for seawater, convert the concentrations
for the two ions in the question below into molality.

The sodium ion:

The sulfate ion:

Answer:

Explanation:

Force = Mass x Acceleration

(20 - 5)N = 5kg x Acceleration

Acceleration = 15/5

                     = 3 N/kg

The depression in freezing point of water here is 3.33 °C. Then the molality of the solution is 1.79. From number of moles of solute is calculated as 0.0161. Then , the molar mass of the solute is 62.11 g.

The addition of a non-volatile salt into a solvent will decrease the freezing point of the solution than the pure solvent. The change in freezing point is proportional to the molality of the solution.

ΔTf = Kf m

Kf is called molal depression constant.

Kf for water = 1.86 °C Kg/mol

given ΔTf = 3.33 (0 - (-3.33))

then m = ΔTf /Kf =  3.33/ 1.86 °C Kg/mol = 1.79

Now, mass of water= 9 g = 0.009 kg

then number of moles = molality × mass of solvent

n = 0.009 kg × 1.79 = 0.0161.

mass of solute taken = 1 g

then, molar mass = 1/0.0161 = 62.11 g.

Therefore, the molar mass of the solute is 62.11 g.

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Answer:

Plasma globes use high voltage, low current electrical discharges to ionize gases, typically a mixture of noble gases such as argon and neon, inside the globe. The electrical discharge excites the gas atoms, stripping them of their electrons to create a cloud of positively charged ions and negatively charged electrons, also known as plasma. The electrical discharge arcs between the electrodes in the globe, creating the colorful, dancing lights that are characteristic of plasma globes.

Explanation:

Answer:

All abiotic and biotic factors of the zoo are part of the ecosystem.

Explanation:

An ecosystem is composed of all the living and non-living things in a particular area, and how they interact with one another. All the items listed, including rocks, water, trees, grass, monkeys, and birds, are part of the zoo ecosystem as they interact with each other and the environment.

Answer:

CH3NH3Pbl3

Explanation:

is an example of a perovskite th that would be used in a perovskite solar cell

Holide Perovskite

Answer:

it's exothermic reaction, becasue it have negative energy and the temperature increases

The volume of the gold plates in cm₃ is 2.513274 cm₃

Volume is the space occupied by a three-dimensional object“”

Volume = {mass} {density}

Given that the thickness or height of medallion, h = 2 mm = 0.2 cm

Diameter of the medallion, d = 4 cm

Radius of medallion, r = d/2 = 2 cm⁻³

The thickness of the gold plating, x = 1 μm = 10⁻⁴ cm

The density of gold = 19.3 g cm

Now we know that the shape of a medallion is cylindrical.

Hence, the volume of the medallion before platting,

Vbefore = π.r2.h = π.(2)2.0.2 = 2.513274 cm₃

Therefore, the volume of the gold-plated is 2.513274 cm₃.

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Answer: Cobalt,Titanium,Potassium

Explanation:

If an element has 4 electron layers can be well understood from their electronic configuration :-

Cobalt -> [Ar] 3[tex]d^{7}[/tex] 4[tex]s^{2}[/tex]

Titanium -> [Ar] 3[tex]d^{2}[/tex] 4[tex]s^{2}[/tex]

Carbon -> [He] 2[tex]s^{2}[/tex] 2[tex]p^{2}[/tex]

Potassium -> [Ar] 4[tex]s^{1}[/tex]

Answer:

The date when the animal was buried can be estimated by using the decay rate of Carbon-14. The half-life of Carbon-14 is 5,730 years, so the date when the animal was buried can be estimated by taking the half-life and multiplying it by the logarithm of the ratio of the 14C/12C ratio of the bone and the 14C/12C ratio of a living plant or animal. In this case, 5,730 years x log(0.477) = 45,906 years ago.

Explanation:

Answer:

g = 9

Explanation:

5.22 = 2.61(g - 7)  ==> solve for g

5.22 / 2.61 = 2.61(g - 7) / 2.61  ==> divide both sides by 2.61 to isolate g

2 = g - 7  ==> simplify

9 = g  ==> add 7 on both sides

g = 9

Ionization constant of a reaction is the ratio of the molar concentration of product to that of reactants. For the given  reaction, the ionization constant is 155.8 .

A compound or element gets ionized to form its anion or cation by the gain or lose of electrons.

Here, acetic acid, CH₃COOH ionizes to form hydronium ion and acetate ion. The ratio of product of molar concentrations of products to the product of molar concentrations of the reactants is called the reaction constant.

The ionization constant of the given reaction is written as:

K = [H₃O]⁺ [CH₃COO-]/[CH₃COOH]

Given, [CH₃COOH] = 0.8 M

[CH₃COO-] = 16.4 M

and  [H₃O]⁺ = 7.6 M.

then, K = 7.6 M × 16.4 M/ 0.8 M = 155.8

Therefore, the ionization constant of the reaction is 155.8.

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First group metals forms 1:1 compounds with 17th group or group 7 A. Thus, the statement is true. Aluminum forms its oxides by 2 Al and 3 oxygen atoms. Hence, the statement is false.

Ionic bonds are formed between metals and non metals. Metals are electron rich and easily loss one or more electrons to electron deficient nonmetals.

First group elements are called alkali metals. They have one valance electron. Group 7A are halogens  with 7 valence electrons. They need one more electron to achieve octet.

Thus, alkali metals donate their valence electron to halogens and forms 1:1 compound. Therefore, the statement is true.

Aluminum reacts with oxygen to form its oxide Al₂O₃. Thus, 2 Al and 3 Os are  combined to form covalent bond. Thus, the statement is false.

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Answer: B.) -12.4

Explanation: This is because the sign of heat transfer is determined by the system's perspective. In this case, the system is releasing heat to the surroundings, which means that heat is flowing out of the system, making the heat transfer negative. The magnitude of the heat transfer is 12.4 J.

Answer:

Explanation:

The equivalent mass of the metal can be calculated using the following equation:

Equivalent Mass = (3.15 g Nitrate)/(1.35 g Metal Oxide) * (1 mole Nitrate)/(1 mole Metal Oxide)

Using the molar masses of nitrate (NO3) and metal oxide (MO):

Equivalent Mass = (3.15 g NO3)/(1.35 g MO) * (1 mol NO3)/(1 mol MO)

= (3.15 g NO3)/(1.35 g MO) * (62.00 g NO3)/(molar mass of MO)

The molar mass of the metal oxide (MO) must be known to calculate the equivalent mass of the metal.

In order to lower the temperature of 350 mL of water from 24°C to 6°C, we need to calculate the amount of heat energy that needs to be removed from the water. We can use the formula:

Q = mcΔT

where Q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

The specific heat capacity of water is 4.184 J/g°C. Since the density of water is 1.0 g/mL, the mass of 350 mL of water is 350 g.

Q = (350 g) (4.184 J/g°C) (18°C)

Q = 30,276 J

To remove this much heat energy, we can use ice to cool the water. The heat of fusion of water is 333.55 J/g, which is the amount of heat energy required to melt one gram of ice at 0°C.

Q = (m)(333.55 J/g)

m = Q / 333.55 J/g

m = 30,276 J / 333.55 J/g

m = 90.4 g

So, 90.4 grams of ice at 0°C would have to melt to lower the temperature of 350 mL of water from 24°C to 6°C.

The volume required of 0,3 N. acid solution to neutralize solution containing 0,32 g of NaOH in 40 cm³ is 26.66cm³.

N1V1 = N2V2

normality = molarity x basicity

For sulfuric acid, the basicity is 2.

∴N1=0.3N

V1=?

Normality of NaOH is [0.32/(40×40)]×1000

N2=0.2×1=0.2N

V2=40ml

0.3 x V1 = 0.2 x 40

V1 = 26.6 cm³

It is defined as the number of moles per liter of solution. It is used to measure gram equivalents to the total volume of the solution. It is used to measure the ratio of the number of moles in the total volume of the solution. The unit of normality is N or eq L-1.

The standard concentration (normality, CN) of a solution is always greater than or equal to the molarity (molarity, CM) of the solution.

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Answer:

So the new concentration of the solution is 0.0001M

Explanation:

To dilute a solution by three orders of magnitude, we need to add 3 zeroes, that is 10^3 times the original volume.

The new concentration would be 0.1M / (10^3) = 0.0001M (4 sig figs)

So the new concentration of the solution is 0.0001M

The name of the compound is calcium chloride and the chemical formula of the compound is CaCl₂.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

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Answer:

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.”