3. Why do you think that printing a document on basic paper will help to ensure that it lasts for a very long time?​

Phosphorous reacts with chlorine gas to give a colorless liquid, which fumes in moist air to produce HCl and  POCl3. The correct answer is A.

When phosphorous reacts with chlorine gas, it produces phosphorus oxychloride (POCl3), a colorless liquid that fumes in moist air to produce hydrochloric acid (HCl) and phosphoric acid (H3PO4).

The reaction can be represented by the following chemical equation:

P + 3Cl2 → POCl3

In this reaction, phosphorous (P) combines with chlorine gas (Cl2) to form phosphorus oxychloride (POCl3).

Therefore, the correct answer is A. POCl3.

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Answer:

Speed

Explanation:

Aliyah must have been trying to find her speed.

The speed is a measure of how fast an object or a body is and it is calculated by finding the ratio of distance with time. Mathematically,

  speed = \(\frac{distance}{time}\) with a unit of m/s.

Hence, with the distance measured on the ground and Aliyah trying to find the time it will take her to cover the distance while running, she must have been trying to find how fast she can run, that is, speed.

Answer:

²⁵₁₁Na⁺

Explanation:

Details about the atom:

          Number of electrons  = 10 electrons

          Number of neutrons  = 14 neutrons

          Number of protons  = 11 protons

The atomic number of an atom is a good indicator of the type of atom we have been given.

From the subatomic particles, the number of protons is the same as the atomic number.

 Since the number of protons is 11, its atomic number will be 11.

The element with atomic number 11 is sodium, Na.

  To write a complete notation, we also need the mass number;

  Mass number  = number of protons + number of neutrons

  Mass number  = 11 + 14  = 25

 The charge on the atom:

     Charge  = Number of protons  - number of electrons  = 11  - 10  = 1+

The element in isotopic notation is given as;

                  ²⁵₁₁Na⁺

Answer:

The moon reflects the light from the sun

Explanation:

Answer:

it reflects light from the sun

Explanation:

The number of mmol of acetic acid (HC2H3O2) required to react with the NaOH is 5.724 mmol.


The balanced chemical equation for the reaction between acetic acid and NaOH is:

HC2H3O2 + NaOH → NaC2H3O2 + H2O

From this equation, we can see that 1 mole of NaOH reacts with 1 mole of HC2H3O2.

Given that the titration solution is 0.424 M in NaOH and the endpoint occurs at 13.50 mL of titrant, we can calculate the number of moles of NaOH used as follows:

Moles of NaOH = concentration of NaOH × volume of NaOH used
Moles of NaOH = 0.424 M × 0.0135 L
Moles of NaOH = 0.005724 mol

Since the stoichiometry of the reaction is 1:1, the number of moles of HC2H3O2 that reacted with the NaOH is also 0.005724 mol.

Finally, we can convert the number of moles of HC2H3O2 to millimoles (mmol) by multiplying by 1000:

Number of mmol of HC2H3O2 = 0.005724 mol × 1000
Number of mmol of HC2H3O2 = 5.724 mmol


5.724 mmol of acetic acid (HC2H3O2) are required to react with the NaOH.

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According to law of definite proportions, chemical compound always includes its constituent components in a fixed ratio.

The law of definite proportions, also known as Proust's law or the law of constant composition, holds that no matter the source or technique of manufacture, a particular chemical compound always includes its constituent components in a fixed ratio.

When two elements are combined to form a compound, their mass proportions are always the same. For instance, oxygen makes up roughly 8/9 of both the mass of just about any samples of pure water, and hydrogen make up the remaining 1/9.

Therefore, according to law of definite proportions, chemical compound always includes its constituent components in a fixed ratio.

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Answer:

As you go up the fractionating column, the hydrocarbons have: lower boiling points lower viscosity (they flow more easily) higher flammability (they ignite more easily) This means that in general hydrocarbons with small molecules make better fuels than hydrocarbons with large molecules.

Answer:

Mass

Explanation:

The IUPAC name for CH3-CH2-CH2-SH is 1-propanethiol. The IUPAC system of nomenclature is used to name organic compounds based on their structural formula. In this case, the compound has three carbon atoms in a continuous chain, which is called a propane chain. The suffix "-thiol" indicates the presence of a sulfhydryl group (-SH) attached to the first carbon atom of the propane chain. Therefore, the correct IUPAC name for this compound is 1-propanethiol. The other options given in the question are incorrect because they either have the wrong number of carbon atoms in the chain or the wrong position of the sulfhydryl group.

In conclusion, the IUPAC name for CH3-CH2-CH2-SH is 1-propanethiol. This name is derived from the three-carbon propane chain and the presence of a sulfhydryl group (-SH) attached to the first carbon atom, which is indicated by the suffix "-thiol". The other options given in the question are incorrect because they do not follow the IUPAC rules for naming organic compounds.

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A water molecule (H2O) is composed of two hydrogen atoms and one oxygen atom that are covalently bonded to each other.

In a covalent bond, atoms share electrons in order to achieve a more stable configuration.

In the case of water, each hydrogen atom shares one of its electrons with the oxygen atom, forming two covalent bonds. Meanwhile, the oxygen atom shares two of its electrons with the hydrogen atoms, forming two additional covalent bonds. In total, a water molecule has four shared pairs of electrons, with two pairs shared between the oxygen and each hydrogen atom.

These covalent bonds give water its unique properties, including its ability to form hydrogen bonds with other water molecules, which contribute to the cohesion, surface tension, and high boiling point of liquid water.

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The balanced chemical equation of the reaction that takes place between hydrochloric acid (HCl) and acetic acid (CH3COOH) can be written as follows: HCl (aq) + CH3COOH (aq) ⟶ H2O (l) + CH3COOH+ (aq) + Cl- (aq). Before mixing, the number of moles of HCl in 1 L of 0.0550 M solution is Moles of HCl = molarity × volume of solution= 0.0550 M × 1 L= 0.0550 moles.

Similarly, the number of moles of CH3COOH in 1 L of 12 M solution is Moles of CH3COOH = molarity × volume of solution= 12 M × 1 L= 12 moles.

As the stoichiometric ratio between HCl and CH3COOH in the above chemical equation is 1:1, the number of moles of HCl (0.0550 moles) is equal to the number of moles of CH3COOH+ ions produced during the reaction.

This means, 0.0550 moles of CH3COOH+ ions will be added to 1 L of 12 M acetic acid solution.

Hence, the new concentration of CH3COOH+ ions in the final solution is the New concentration of CH3COOH+ ions = (0.0550 moles / 2 L) = 0.0275 M.

To find out the pH of the solution, we need to calculate the concentration of H+ ions.

We know that the acid dissociation constant (Ka) for acetic acid is 1.80 x 10^-5. The equilibrium constant expression for the dissociation of acetic acid can be written as follows: CH3COOH (aq) + H2O (l) ⇌ CH3COO- (aq) + H+ (aq).

The equilibrium constant expression for the above reaction is: Ka = [CH3COO-] × [H+]/[CH3COOH].

The concentration of CH3COOH can be assumed to be almost constant, as the change in its concentration is negligible after adding a small amount of HCl.

Hence, we can write:[CH3COO-] = [H+] × Ka /[CH3COOH].

Substituting the given values in the above equation, we get [H+] = √(Ka × [CH3COOH])= √(1.80 x 10^-5 × 0.0275)= 4.20 x 10^-4 M.

Therefore, the final H+ concentration is 4.20 x 10^-4 M.

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Answer:

Mass of Cl = 35.5

Mass of Cl2 => 35.5×2

=> 71 g/mol

hope that helps ✌

71

The atomic mass of chlorine is equal to the molar mass of chlorine so the molar mass of chlorine is 35.5

=> molar mass for Cl^2: 35,5*2=71

Answer:

Transpiration

Then condensation

Then precipitation

and etc.

Answer: The water cycle?

Explanation: I hope this answer your question- Lily ^-^

Answer:

1.64 moles O₂

Explanation:

Part A:

Remember 1 mole of particles = 6.02 x 10²³ particles

So, the question becomes, how many  '6.02 x 10²³'s are there in 9.88 x 10²³ molecules of O₂?

This implies a division of given number of particles by 6.02 x 10²³ particles/mole.

∴moles O₂ = 9.88 x 10²³ molecules O₂ / 6.02 x 10²³ molecules O₂ · mole⁻¹ = 1.64 mole O₂

_______________

Part B needs an equation (usually a combustion of a hydrocarbon).

Answer:

A

Explanation:

Because it does not change entirely.

The basic mechanism that naturally creates freshwater within the hydrologic cycle is through the processes of evaporation, precipitation, infiltration, and runoff.

1. Evaporation: Water from the Earth's surface (e.g., oceans, lakes, and rivers) is heated by the sun and turns into water vapor, rising into the atmosphere.

2. Condensation: The water vapor cools as it rises, condensing into clouds.

3. Precipitation: When the clouds become heavy enough, the water droplets combine and fall back to the Earth's surface as precipitation (e.g., rain, snow, or hail).

4. Infiltration: Precipitation that reaches the ground can infiltrate the soil, becoming part of the groundwater system.

5. Runoff: Precipitation that does not infiltrate the soil will flow over the land surface as runoff, eventually entering rivers, lakes, and oceans.

This continuous movement of water through the various stages is known as the hydrologic cycle. Note that reverse osmosis is not part of this natural process; it is a human-engineered method used for water purification.

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Answer:

Magnesium hydroxide has 3 unique elements.

Explanation:

Long story short, 2 is the balancing compound in structure to make up hydroxide, therefore 1 compound would be left to create Mg(2O)H.

(This is only an opinion of mathematical science to me, I don't have complete understanding of this subject either, good luck.)

Answer:

molarity

Explanation:

Answer:

Boiling point

Explanation:

Distillation is one of the most widely used separation technique in chemistry. It is used to separate a mixture of liquid substances with different boiling point. Hence, the basis of the separation is BOILING POINT DIFFERENCE.

In the procedure, the liquid substances are heated until they turn gaseous, which they do at different times considering their different boiling points. The separated components are then converted back to liquid states in a process called CONDENSATION.

Answer:

All elements are neutral

Explanation:

The plum pudding model of the atom indicated that all elements are neutral. The model was proposed by J.J Thomson after he conducted his experiment on the gas discharge tube.

From the experiment he discovered electrons which he called cathode rays.

Therefore, he suggested the plum pudding model of the atom.

The model describes negatively charge sphere surrounded by positive charges to balance them.

Answer:

Please see attachment

Explanation:

You can draw something like the attachment. The nucleus is in the middle with both proton and neutron. The electron circles around the nucleus

Answer:

These questions are not chemistry darling. You have chosen the wrong subject

Answer:

Protons, neutrons, electrons..

Explanation:

Protons and neutrons consist of quarks which are stuck together by tiny things called gluons.

Hope this helps! :)

Answer:

I think it B

Explanation:

In any aqueous solution at 25°C, the ionic-product of water (Kw) is a constant value equal to 1.0 x 10⁻¹⁴ mol²/L².

Due to the auto-ionization or self-ionization of water, water molecules dissociate into hydronium ions (H₃O⁺) and hydroxide ions (OH⁻). At 25°C, the Kw is equal to 1.0 x 10⁻¹⁴ mol²/L².

This constant value of Kw plays a crucial role in understanding the acidity and basicity of aqueous solutions. It helps to establish the relationship between the concentrations of hydronium and hydroxide ions, as their product remains constant at a given temperature. The pH and pOH scales are derived from this relationship, providing a convenient method for measuring the acidity or basicity of a solution.

In summary, the ionic-product of water, Kw, remains constant at 1.0 x 10⁻¹⁴ mol²/L² for any aqueous solution at 25°C. This constant is a result of the auto-ionization of water and helps to understand the relationship between hydronium and hydroxide ions in the context of acidity and basicity.

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James need 385.862 g of mabr to have 4.2 moles of nabr for an experiment. The provided options were incorrect.

moles = grams / molar mass

the molar mass of NABR => 92.01 g/mol;

grams = moles x molar mass:

grams = 4.20 moles x 92.01 g/mol = 385.862 g.

The term "molecular weight" indicates the mass of a specific chemical molecule. It is determined by integrating the atomic weights of all the atoms in the molecule and is often reported in grammes per mole (g/mol) units. A substance's molecular weight can be used to identify it, comparing its properties to those of other compounds, and estimate the quantities of reagents required for a chemical reaction.

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Answer:

D. 432

Explanation:

NaBr has a molecular weight of 102.894 g/mol

102.894 g/mol x4.2=432.1548 g/mol

Answer:

Aluminum has a density of 2.70 g/cm3