349+1.10 + 100 =


and i have to put it in sig fig?

Answer:

yaeh

Explanation:

a)Ca(OH)

2

​

+CO

2

​

⟶CaCO

3

​

+H

2

​

O

No. of atoms:Ca−1;O−4;H−2;C−1

b)Zn+AgNO

3

​

⟶ZnNO

3

​

+Ag

No. of atoms:Zn−1;Ag−1;N−1;O−3.

The base used in deodorants is magnesium hydroxide. This is further explained below. Option B is correct.

Generally, A base is a chemical that reacts with hydrogen ions to neutralize an acid, a base ranges from 7-14 in the pH range

In conclusion, In deodorants, magnesium hydroxide is utilized as a base. The function of the base is to neutralize the acid released in our mouth by bacteria, which causes tooth decay and other associated problems.

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Answer:

C. magnesium hydroxide

Explanation:

Edge

Magnesium oxide : MgO

Calcium bicarbonate:  Ca(HCO3)2

aluminum carbonate: Al2(CO3)3 or C3Al2O9

According to the question the new volume of the balloon is 2731.66 L.

Volume is the measure o the amount of space a object or material occupies. It is usually measured in liters, cubic meters, gallons, or cubic feet. Volume is an important concept in many fields, including physics, engineering, chemistry, and mathematics. In physics, volume is a measure of the amount of space a body occupies. In engineering, volume is used to determine the size of a tank or reservoir, the capacity of a pipe, or the amount of material needed for a construction project. In mathematics, volume is used to calculate the area of a three-dimensional shape, such as a cube, sphere, or cylinder.

The volume of a gas can be calculated using the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (8.314 J/mol•K), and T is the absolute temperature.

Since the pressure remains constant, we can rearrange the equation to solve for V: V = nRT/P.

To solve for the new volume, we can plug in the known values:

V = (1 mol)(8.314 J/mol•K)(330.0 K)/(1 atm)

V = 2731.66 J/atm

V = 2731.66 L

Therefore, the new volume of the balloon is 2731.66 L.

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Answer:

this is your answer.....

Answer:

B; 229g of Zn

Explanation:

To convert mol of Zn, we must find the atomic mass of Zn. This is 65.38.

Multiply 3.5 mol of zn by 65.38.

3.50 mol of Zn*65.38g = 228.83g of Zn

Therefore, the mass = 229g of Zn

The molar solubility of Mg(OH)2 in pure water is calculated to be approximately 1.34 x 10⁻⁶ M. In the presence of 8.68 x 10⁻² M MgCl2, the molar solubility of Mg(OH)2 decreases to approximately 1.34 x 10⁻⁶ - 8.68 x 10⁻² M.

In the presence of 3.65 x 10⁻² M KOH(aq), the molar solubility of Mg(OH)2 increases to approximately 1.34 x 10⁻⁶ + 3.65 x 10⁻² M. The solubility of a compound, represented by its molar solubility, depends on the presence of other ions in the solution. In pure water, Mg(OH)2 dissociates into Mg²⁺ and 2OH⁻ ions. The solubility product expression for Mg(OH)2 is given by Ksp = [Mg²⁺][OH⁻]², and since the concentration of Mg²⁺ is equal to the concentration of OH⁻, we can represent the molar solubility of Mg(OH)2 as x M. Substituting these values into the Ksp expression, we get x * (2x)² = 1.8 x 10⁻¹¹. Solving this equation yields x ≈ 1.34 x 10⁻⁶ M as the molar solubility of Mg(OH)2 in pure water.

In the presence of MgCl2, the concentration of Mg²⁺ ions increases due to the dissociation of MgCl2. However, since Mg(OH)2 is a sparingly soluble salt, the increase in Mg²⁺ concentration does not significantly affect the solubility of Mg(OH)2. Therefore, the molar solubility remains approximately the same as in pure water.

In the presence of KOH(aq), the concentration of OH⁻ ions increases. This increase in OH⁻ ions shifts the equilibrium towards the dissociation of Mg(OH)2, leading to an increase in its molar solubility. Therefore, the molar solubility of Mg(OH)2 increases by approximately 3.65 x 10⁻² M in the presence of 3.65 x 10⁻² M KOH(aq).

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#Use Avogadro

Number of atoms = mol × 6×10²³

7.28 × 10²⁵ = mol × 6×10²³

mol = (7.28×10²⁵) : (6×10²³)

mol = 121.3mol

Answer:

If you have a periodic table of the elements, you should be able to do this easily. The best periodic table, in my opinion, is the interactive periodic table at ptable(.com).

I will attach a formula sheet with everything you might need to know in chemistry.

Explanation:

You should be able to do this, but if you need more help let me know! :)

Answer: 16.5% First, determine the total error by subtracting the accepted value from the value you measured. e = 17.7 -21.2 = -3.5 Then

divide the error

Explanation:

The mass of the iron oxide produced in the given chemical reaction is equal to 27.04 grams.

The limiting reagent in a chemical reaction can be described as that reactant that will decide the amount of the yield of the product. The reactant consumed first will confirm the completion of the reaction if the reactants are not taken in stoichiometry.

Given the chemical reaction of the formation of iron oxide:

4Fe   +    3O₂    →    2Fe₂O₃

Given the mass of the iron = 15.4 grams

The moles of the iron = 15.4/56 = 0.275 mol

The mass of the oxygen gas = 3.6 grams

The moles of the oxygen gas = 3.6 /32 = 0.1125 mol

From the chemical equation, 4 moles of the Fe react with oxygen = 3 mol

Then 0.275 mol of the Fe will react with oxygen = 3/4 × 0.275 = 0.206 mol

Therefore, oxygen is the limiting reagent here.

The 3 mols of oxygen produced iron oxide = 2 mol

0.1124 mol of oxygen will produce iron oxide = (2/3) × 0.1125 = 27.04 g

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Answer:

This is an example of a form of energy transferring itself. Tons of electrons are passed through the energy itself to you very quickly. That's why when we touch a hot surface and get burned, it's because our skin molecules are touching the heat molecules.

Answer:

its either c or d

Explanation:

The method that is used for the making of copper sulphate crystals would be discussed below in details.

Crystals are solid structures of a compound which are arranged in a definite pattern.

The method of production of pure crystals of copper sulphate is discussed below:

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In an sp hybridization, one s orbital and one p orbital mix to form two sp hybrid orbitals. Among the given choices, the molecule that contains an sp-hybridized carbon is (a) HCN (hydrogen cyanide).

The concept of hybridization explains the arrangement of electrons and orbitals in a molecule. These orbitals are then utilized by the central atom to form sigma bonds with surrounding atoms.

Analyzing the options, we get:

Here,  we can see that the molecule HCN contains an sp-hybridized carbon. Therefore, the correct answer is (a) HCN.

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The temperature of a gas as the volume of the gas increases and the temperature also rises.

A location inside a gas experiences pressure in all directions. The pressure force at a gas' surface acts perpendicular to the surface. If the gas is moving overall, the measured pressure will differ according to the motion's direction.

The force that is dispersed over a unit area per time perpendicular to an object's surface.

Pressure is the term for the physical force that is exerted on an object. The force is applied perpendicularly to the objects' surfaces per unit area. F/A is the basic formula for pressure (Force per unit area). Pressure is measured in Pascals (Pa). There are four distinct types of pressure: gauge, absolute, ambient, and differential.

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Answer:

An inorganic peroxide consisting of two hydroxy groups joined by a covalent oxygen-oxygen single bond. Hydrogen peroxide is a chemical compound with the formula H2O2.

Answer:

Explanation:

in set up A the fresh soil contains carbon (iv) oxide which reacts with lime water to form an insoluble white precipitate of calcium carbonate. In set up B carbon (iv) oxide is not present in the soil since it has been boiled the gas has been expelled. Therefore there is no observable change in B

Answere:No sé esto jeje lo siento no soy tonta pero simplemente no sé esto

Explanation:

The pKa of an acid solution can be determined from the pH value. In this case, the pH of a 11.1 M solution of acid H2CO3 is measured as 2.660. By calculating the Ka value (acid dissociation constant) from the pKa, we can determine the equation that describes the acid's dissociation in water.

The pKa of an acid is defined as the negative logarithm of the acid dissociation constant (Ka). In this case, we can calculate the Ka value using the given pH.

pH = -log[H+]

Since H2CO3 is a diprotic acid, it can dissociate twice:

H2CO3 ⇌ H+ + HCO3-

HCO3- ⇌ H+ + CO3^2-

The dissociation reactions contribute to the concentration of H+ ions, which determine the pH. Therefore, the pH of a solution of H2CO3 can be related to the Ka values of the two dissociation reactions.

By calculating the antilog of the negative pH value, we can obtain the [H+] concentration. Then, using the [H+] concentration, we can calculate the Ka value.

[H+] = 10^(-pH)

Next, we can set up an expression for the Ka value:

Ka = [H+][HCO3-] / [H2CO3]

Using the values obtained, we can substitute [H+] and [HCO3-] into the equation:

Ka = ([H+]^2) / ([H2CO3] - [H+])

By plugging in the known values for pH and [H2CO3], we can calculate the Ka value.

Finally, the equation described by the Ka value represents the equilibrium relationship between the acid (H2CO3) and its dissociation products (H+ and HCO3-).

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A pure substance refers to a substance that consists of only one type of particle or molecule. It is uniform in composition and exhibits consistent physical and chemical properties throughout.

In contrast, impure substances, also known as mixtures, consist of two or more different substances mixed together. An example of a pure substance is distilled water. Distilled water consists solely of water molecules (H₂O) and does not contain any other substances or impurities. It is obtained by the process of distillation, which involves boiling water to vaporize it and then condensing the vapor back into liquid form. Distilled water is free from minerals, contaminants, and other dissolved substances, making it a pure substance. Other examples of pure substances include elements such as oxygen (O₂), nitrogen (N₂), and gold (Au), as well as compounds like sodium chloride (NaCl) and glucose (C₆H₁₂O₆), provided they are in their pure forms without any impurities. In summary, a pure substance is a sample that consists of only one type of particle or molecule, exhibiting uniform composition and consistent properties throughout. Distilled water serves as an example of a pure substance due to its sole composition of water molecules.

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Answer:

I think this is it. and 38 points??

d is the answer. according to me

Answer:

1) Organ

2) Organism

3) Organ System

4) Tissue

5) Cell or Tissue (im not sure)

6) Organism

7) Organ

8) Organism

9) Organism

Answer:

pottasium,francium,rubidium,cesium

Answer:

Explanation:

K: 2, 8, 8, 1 but 19p+

K+: 2, 8, 8 but 19p+

Ca: 2, 8, 8, 2 but 20p+

Ca2+, 2, 8, 8 but 20p+

K and Ca are larger than their corresponding ions because of one more energy level, so Li is the smallest.

K and Ca have the same no. of electron shells but K has less p+ than Ca. so the attraction between electron and p+ in K is less than that in Ca. Therefore, K is larger than Ca.

Arachidonic acid is a polyunsaturated fat that has 20 carbons and 4 double bonds, and its shorthand notation is (20:4). In this notation, the first number (20) indicates the number of carbons, and the second number (4) represents the number of double bonds.

Therefore, to write the molecular formula of arachidonic acid, we need to know the chemical formula of a fatty acid with 20 carbons and 4 double bonds. To do that, we start with a fatty acid with 20 carbons, which is an unbranched chain with the formula C19H39COOH. Then, we need to introduce the double bonds into the chain, starting at the methyl (CH3) end of the chain.

The shorthand (20:4) indicates that there are four double bonds, so we need to replace four of the carbon-hydrogen (C-H) bonds with carbon-carbon double bonds (C=C). The double bonds are introduced at the following positions: the fifth, eighth, eleventh, and fourteenth carbon atoms. The resulting molecular formula for arachidonic acid is:C19H31COOHC=C-C=C-C=C-COOH. Therefore, the molecular formula of arachidonic acid is C20H32O2.

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Answer:

Single celled organism

Explanation:

They fall under two categories:

Eukaryotes and prokaryotes.

Eukaryotes: Evolved from prokaryotes, they are larger and more complex. Unlike prokaryotes, they have a nucleus. Can be single celled or multicellular.

Prokaryotes: Oldest cell type, small and simple. They do not have a nucleus. Open unit with no compartments.

Answer:

Confirm the results

Explanation:

Answer:

its the answer from the guy above me so its B

Explanation: