explain the differences of molecules and formula units

Answer:

1 sulfide

2 Fluoride

3 A

5 A

6 2

Answer:

The answer is 19

Explanation:

I took the test on edg

Atoms are smallest particle of any entity; Atoms consist of three fundamental types of particles, protons, electrons and neutrons. Option C & D are the correct statement.

Define an atom?

Atoms are the smallest particle of an element. Atoms cannot be broken into sub parts. It consisting of 3 particles like, protons, electrons and neutrons.

Atoms of the all substance do not have same chemical properties. Because, atoms have different number of proton and electrons. Atoms cannot be destroyed by heating or cooling. Smallest unit atoms have elemental chemical identity and atoms can combine to make all the substance on earth.

Therefore, statement C and D are correct.

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The statement that correctly describes atoms are:

c. Atoms are the smallest unit of an element that has the chemical identity of that element.

d. Atoms combine to make all the substances on Earth.

The tiniest component of an element is called an atom. Atoms are not divisible into smaller components. It is made up of three different particles: protons, electrons, and neutrons.

All atoms do not share the same chemical characteristics. Because the quantity of protons and electrons in each atom varies. No amount of heat or cold can kill an atom.

Therefore, the correct option is c and d.

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Answer:

1600 mm to m = 1.6 meters

Explanation:

Answer:

letter D.

Explanation:

it shows a pattern for determining the side of lengths of a triangle yeah the triangle had a model and a length

An instant cold pack takes advantage of an endothermic dissolution process.

Instant cold packs typically consist of two compartments containing separate substances, usually water and ammonium nitrate or urea. When the pack is activated by breaking a barrier between the compartments, the substances mix, leading to dissolution. The dissolution of ammonium nitrate or urea in water is an endothermic process, meaning it absorbs heat from the surroundings, resulting in a decrease in temperature. This temperature decrease causes the pack to become cold, providing a cooling effect. By utilizing an endothermic dissolution process, the instant cold pack can rapidly lower the temperature for therapeutic or comfort purposes.

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The finest website for you may rely on your individual requirements and interests. There are several websites that provide O level chemistry notes.

For students seeking free access to top-notch online resources for basic, organic, inorganic, and physical chemistry notes, check ChemistNotes.com. You can get all of the Organic & Inorganic Chemistry Notes, from basic notes to advanced level notes, in one location.

An efficient and successful technique to take notes for the sciences is to use the Cornell Note-taking System. Your paper should be divided into two columns in general. You can easily review for tests using this technique, keep your notes organised, and swiftly sum up a lecture.

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The pressure difference between the top and bottom of a column of liquid is given by the expression:

ΔP = ρgh

where ΔP is the pressure difference, ρ is the density of the liquid, g is the acceleration due to gravity, and h is the height of the column.

Let's assume that the pressure supporting a column of Hg to a height of 256 mm is equal to 1 atm. Using the density of Hg, we can calculate the pressure difference as:

ΔP = (13.6 g/cm³) x (9.81 m/s²) x (0.256 m) = 33.8 kPa

Now, we can use the pressure difference and the density of water to determine the height of a column of water that would be supported by the same pressure:

ΔP = ρgh

h = ΔP / (ρg)

h = (33.8 kPa) / [(1.00 g/cm³) x (9.81 m/s²)] = 348 cm

Therefore, the answer is A. 348 cm.

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The type of organic molecule that is hydrophobic is Lipids, including fats, oils, waxes, phospholipids, and steroids. A famous example is a triglyceride, which contains hydrophobic fatty acids.

The type of organic molecule that is hydrophobic or 'water-fearing' is Lipids. Lipids include fats, oils, waxes, phospholipids, and steroids. Being hydrophobic, they repel water and tend to associate with other lipids in a water environment. A classic example of a lipid molecule is a triglyceride, which consists of three fatty acids attached to a glycerol backbone. The fatty acids are the hydrophobic part of the molecule, which is why fats and oils do not mix with water.

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Answer: 300g

Explanation:

first we write the given values on top

224L. x

3 NO2 (g) + H2O (l) = 2HNO3 (l) + NO (g)

22.4L 30g

then we form a formula

224L/22.4L= x/30g

224*30/22.4

6720/22.4= 300g

Answer:

\(H_2CO_3\rightleftharpoons H_2O + CO_2\)

Explanation:

When carbon dioxide dissolves and reacts with water, the water and the gaseous  \($CO_2$\)   reacts to form a dilute mixture solution of \($H_2CO_3$\) (carbonic acid ).

The reaction is   \(H_2O + CO_2\rightleftharpoons H_2CO_3\)

This is a forward reaction.  And the symbol   \($ \rightleftharpoons $\)  shows that the reaction can be reversible. It means that the reaction can be carried in forward direction as well as in the backward direction.

The reaction attains chemical equilibrium until the reactants and the products no longer changes with time.  

The carbonic acid can also dissociates into carbon dioxide and water in the backward direction.

\(H_2CO_3\rightleftharpoons H_2O + CO_2\)

Explanation:

here u go the Answer with the working:)

Answer:

high less air cause there is no trees and lower is the same

Explanation:

The standard heat of vaporization of H₂0 is +2.5 kJ/g.

The standard heat of formation  of a compound is described as the change of enthalpy during the formation of 1 mole of the substance from its constituent elements in their reference state, with all substances in their standard states.

To calculate it, we need to divide the total energy required to change the 20g of H₂0 to steam by the amount of substance being vaporized.

The amount  is 20 g

the total energy required = 50kj

Therefore the standard heat of vaporization of H₂0 is   20/50 = +2.5 kJ/g

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The active site of beta-galactosidase contains key amino acids that play a crucial role in its catalytic activity. These amino acids include Glu-461, Tyr-503, and Glu-537. They work together to facilitate the hydrolysis of lactose into glucose and galactose.

The active site of beta galactosidase contains several important amino acids, including glutamic acid, histidine, and aspartic acid. These amino acids play key roles in catalyzing the hydrolysis of lactose, which is the primary function of beta galactosidase. Other amino acids present in the active site may also contribute to the enzyme's overall function and specificity, such as arginine, lysine, and tryptophan. The exact arrangement and function of these amino acids may vary depending on the specific species of beta galactosidase and the surrounding environment.

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Yes, liquid dish soap is soluble in water. If the liquid dish soap was less concentrated, it would still do an effective job in washing the dishes because the amount of soap that is necessary to clean a dish is relatively low. Soapy water affects the environment by causing pollution and can harm aquatic life because it may contain chemicals such as nitrates, phosphates, and ammonia that can cause algae blooms and oxygen deprivation in water.

Liquid dish soap is a surfactant that is water-soluble. Surfactants are made up of hydrophilic (water-loving) and hydrophobic (water-fearing) components. Soap has a hydrophilic head that is attracted to water and a hydrophobic tail that is repelled by it. The hydrophobic tail attaches itself to grease and dirt, while the hydrophilic head detaches it from the surface. As a result, dish soap makes it easier for water to wash away the dirt.

Therefore, liquid dish soap is soluble in water.If the liquid dish soap was less concentrated, it would still be effective in washing the dishes because the amount of soap that is required to clean a dish is relatively low. As a result, it will not matter how concentrated the soap is since it will be used in such a small quantity.Soapy water affects the environment by causing pollution and can harm aquatic life. Water can become polluted by a variety of substances, including soap. When soap is used, it can find its way into water sources, which can be harmful to the environment.

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The molarity of the acid is : 0.82 Molar

Calculate the molarity of acid?

Volume of acid = 25 ml

Molarity of base = 0.5 M

Volume of base = 41.00 ml

Since, acid and base reacts in 1:1 stoichiometric ratio, we can use the molar equivalence formula as:

M(acid) × V(acid) = M(Base) × V(Base)

M(acid) = 0.82 M

What is Molarity?

Molarity (M) is the amount of a substance in a given volume of solution. Molarity is defined as the number of moles of solute per liter of solution. Molarity is also called the molarity of a solution.

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We are add sodium bisulfite at the end of the reaction because it is a reducing agent which is used to destroy all excess of oxidant.

Sodium bisulfite (Sodium bisulfite, NaHSO₃) is a mild reducing agent as well as useful for destroying oxidizing organisms, including halogens and highly oxidized metals, during operation. It is initially used as food preservative that is to prevent dried fruit from discoloring and as an antioxidant. At the end of the reaction period, any excess oxidizer must be destroyed. This is done by adding sodium bisulfite (NaHSO₃) to reduce excess oxidant. Sodium bisulfite reacts with hydrochloric acid to produce sodium chloride, water H2O and sulfur dioxide.

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We can see here that the product(s) formed at the cathode in the electrolysis of an aqueous solution of \(K_{2}SO_{4}\) are: 2. H2 and OH-

Electrolysis is a chemical process that involves the use of an electric current to drive a non-spontaneous chemical reaction. It is typically carried out in an electrolytic cell, which consists of two electrodes—an anode (positive electrode) and a cathode (negative electrode)—immersed in an electrolyte solution.

During electrolysis, when an electric current is passed through the electrolyte, chemical reactions occur at the electrodes.

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Answer:Chloroplast

Explanation:

Answer:

D

Explanation:

Chloroplast

Answer:

your ear detecteds by cells with shorter hair bundles, located closest to where sound enters the ear; lower-pitched sounds are detected by cells with taller hair bundles located further in the ear!

Explanation:Hope this helps!

Answer:

High-pitched sounds are detected by cells with shorter hair bundles, located closest to where sound enters the ear; lower-pitched sounds are detected by cells with taller hair bundles located further in.

Explanation:

that pattern progresses through the several thousand hair cells that are essential for hearing

Answer:

3

Explanation:

begining 0's are never significant

all numbers 1-9 are always significant

ending 0's are only significant when there is

a decimal.

The change in electric potential energy of a doubly-ionized sodium ion Na++ as it moves from inside to outside the cell would be 140 mV or 0.14 V.

Electric potential energy is a type of potential energy that is associated with the position or configuration of electric charges in an electric field.

Electric potential energy is directly proportional to the charge of the ion and the change in electric potential. Since the Na++ ion is doubly-ionized, its charge is 2 times that of a Na+ ion. Therefore, the change in electric potential energy would be 2 times the change in electric potential, or 2 x (-70 mV - 0 V) = 140 mV or 0.14 V.

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Part A: The molality of the citric acid solution is 0.400 mol/kg.

Part B: The molality of the KBr solution is 30.0 mol/kg.

Part C: The molality of the aspirin solution is 0.219 mol/kg.

Part A: To calculate the molality of the citric acid solution, we use the formula:

Molality (m) = moles of solute / mass of solvent in kilograms.

Given that 0.660 mol of citric acid is dissolved in 1.65 kg of water, we can calculate the molality as 0.660 mol / 1.65 kg = 0.400 mol/kg.

Part B: To calculate the molality of the KBr solution, we first need to convert the mass of KBr from milligrams to kilograms. Then we use the same formula as in Part A:

Molality (m) = moles of solute / mass of solvent in kilograms.

Given that .165 mg of KBr is dissolved in 5.50 mL of water, we convert 0.165 mg to 0.165 g (0.165 mg = 0.165 × 10^-3 g) and convert 5.50 mL to 5.50 × 10^-3 kg (1 mL of water = 1 g). Now we can calculate the molality as 0.165 g / 5.50 × 10^-3 kg = 30.0 mol/kg.

Part C: To calculate the molality of the aspirin solution, we use the same formula as in Part A:

Molality (m) = moles of solute / mass of solvent in kilograms.

Given that 4.15 g of aspirin is dissolved in 135 g of dichloromethane, we convert the mass of aspirin to moles using its molar mass and then calculate the molality as 0.219 mol / 0.135 kg = 0.219 mol/kg.

In summary, for Part A, the molality of the citric acid solution is 0.400 mol/kg. For Part B, the molality of the KBr solution is 30.0 mol/kg. And for Part C, the molality of the aspirin solution is 0.219 mol/kg.

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Answer:

92.01 g/mol

Explanation:

So first you need to find the empirical formula by the percents. That would be, assuming that you have 100 grams of the the sample, divide each quantity of each element found by its respective molar mass.

30.4 g of N ÷ 14 g/mol N= 2.17 mol of N

69.6 g of O ÷ 16g/mol= 4.35 mol of O

You can establish now the empirical formula.

N2.17O4.35,

but since you can't have a decimal subscript, you divide each subscript by the minimum subscript

NO2

So then you're said that the molecular formula derived from that empirical formula has 2 nitrogen, so you multiply all the subscripts, by 2:

N2O4

-Dinitrogen Tetraoxide

-Nitrogen oxide (IV)

Then all you have to do is find the molecular mass of the compound using the periodic table and what you obtain is the molar mass.

remember: molecular mass is correspondent to molar mass.