TRUE/FALSE. solubility of gases decreases with increasing temperature.

Option c) NH4Cl will hydrolyze when dissolved in water.

Hydrolysis is a chemical reaction that occurs when a salt reacts with water, resulting in the formation of an acidic or basic solution. In this case, when NH4Cl (ammonium chloride) is dissolved in water, it undergoes hydrolysis.

The ammonium ion (NH4+) is the conjugate acid of ammonia (NH3), which is a weak base. When NH4Cl dissociates in water, the ammonium ion reacts with water to form NH3 and H3O+ (hydronium ion). This process is called hydrolysis.

NH4+ (aq) + H2O (l) ↔ NH3 (aq) + H3O+ (aq)

The formation of NH3 leads to an increase in the concentration of hydroxide ions (OH-) in the solution, making it slightly basic. At the same time, the presence of H3O+ ions makes the solution slightly acidic. Therefore, the hydrolysis of NH4Cl results in a slightly acidic and slightly basic solution.

In contrast, salts like NaCl and KCl do not undergo hydrolysis when dissolved in water because they consist of cations (Na+ and K+) and anions (Cl-) that do not react with water to form acidic or basic species.

Na2SO4 (sodium sulfate) is also an example of a salt that does not undergo hydrolysis. The sulfate ion (SO42-) does not react with water to form acidic or basic species, so the solution remains neutral.

Therefore, among the given options, only NH4Cl undergoes hydrolysis when dissolved in water.

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The question is incomplete. Find the full content below:

Which one of the following salts when dissolved in water will hydrolyse?

a) NaCl

b) KCl

c) NH4Cl

d)Na2SO4

Answer:

tert-butyl bromide

Explanation:

sec-butyl bromide

CH3 -CH-CH2-CH3

         Br

tert-butyl bromide

       CH3

CH3-C- Br

       CH3

isopropyl bromide

       CH3

CH3-CH-Br

isobutyl bromide

       CH3

CH3-CH-CH2-Br

The mass percentage of carbon in nylon is approximately 68.1%.

What is mass of carbon?

The first step is to calculate the amount of carbon in 2.50g of carbon dioxide, using the molar mass of carbon and carbon dioxide:

1 mole of carbon has a mass of 12.01g

1 mole of carbon dioxide has a mass of 44.01g (12.01g for carbon + 2(16.00g) for oxygen)

So, the mass of carbon in 2.50g of carbon dioxide is:

(12.01g / 44.01g) x 2.50g = 0.681g

This means that the original 1.00g of nylon must have contained 0.681g of carbon. To find the percentage of carbon in nylon, we divide the mass of carbon by the mass of nylon and multiply by 100:

(0.681g / 1.00g) x 100% = 68.1%

Therefore, the percentage of carbon in nylon is approximately 68.1%.

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Complete question is: When 1.00g of nylon is burnt in excess oxygen, it produces 2.50g of carbon dioxide. the percentage of carbon in nylon is approximately 68.1%.

Answer:Explanation:

In compounds, all other atoms are assigned an oxidation number so that the sum of the oxidation numbers on all the atoms in the species equals the charge on the species.

Answer:

(d) soap.

Explanation:

A soap is obtained by alkaline hydrolysis of a fat to yield the soap and glycerol. This process is known as saponification.

A soap solution is usually basic. Since phenolphthalein turns pink in an alkaline solution, then when phenolphthalein is added to a soap solution, the solution soon turns pink because it is alkaline in nature.

As a matter of fact, a soap sometimes has almost the pH of baking soda!

Answer:

Towards the products, or to the right

Explanation:

There are no provided answer choices, but the answer should be to the right.

By Le Chatelier's principle, which basically can be summarized as "if you mess with chemistry, chemistry messes back", if more reactants are added, the equilibrium will shift to the right towards the products in order to make more products and counteract the increase in I₂.

Answer:

The polar water molecules exert strong cohesive forces on one another

Explanation:

The forces of cohesion refer to the strong attractive forces that molecules of a substance exert on each other.

This strong attractive force keeps the molecules of the water together and causes the water molecules to be pulled inside towards each other. We refer to this phenomenon as surface tension.

Hence, due to surface tension, water does not run off an inclined plane.

The amount of heat released when 17.5 g of Al reacts with excess Fe2O3 is -825.664 kJ.

To determine the amount of heat released when 17.5 g of Al reacts with excess Fe2O3, we need to first determine how many moles of Al are present. Then we can use the balanced chemical equation to determine the number of moles of Fe2O3 that react, and finally, we can use the enthalpy change of reaction to determine the amount of heat released.

Convert the mass of Al to moles:

moles Al = mass Al / molar mass Al

moles Al = 17.5 g / 26.98 g/mol

moles Al = 0.648 mol

Use the balanced chemical equation to determine the number of moles of Fe2O3 that react:

2 moles of Al react with 3 moles of Fe2O3

moles Fe2O3 = (3 moles) / (2 moles) * moles Al

moles Fe2O3 = 0.972 mol

Use the enthalpy change of reaction to determine the amount of heat released:

ΔH = -852 kJ/mol * moles Fe2O3

ΔH = -852 kJ/mol * 0.972 mol

ΔH = -825.664 kJ

Therefore, the amount of heat released when 17.5 g of Al reacts with excess Fe2O3 is -825.664 kJ.

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Answer:

719.83°C

Explanation:

The heat that the sample of Zinc gives is equal to the heat that water is absorbing. That is:

C(Zn) * m(Zn) * ΔT(Zn) = C(H2O) * m(H2O) * ΔT(H2O)

Where:

C is specific heat (Zn: 0.390J/g°C; H2O: 4.184J/g°C)

m is mass (Zn: 2.50g; H2O: 65.0g)

ΔT (Zn: ?; H2O: (22.5°C - 20.0°C = 2.50°C)

Replacing:

0.390J/g°C * 2.50g * ΔT(Zn) = 4.184J/g°C * 65.0g * 2.50

ΔT(Zn) = 697.33°C

As final temperature of Zn is 22.50°C, initial temperature is:

Initial temperature: 697.33°C + 22.50°C

719.83°C

What is true about the particles?

D. They stay in place and vibrate.

Answer:

I would say the last one because mass is not created nor destroyed.

Explanation:

folic Acid

Folic acid, often known as folate, is a water-soluble B vitamin that is necessary for the generation of healthy red blood cells and the regular functioning of the brain system. Folate is present in numerous foods, including leafy green vegetables, legumes, nuts, and grains. Numerous processed goods, including breakfast cereals, breads, and rice, contain it as well. Folic acid is essential for pregnant women because it prevents birth abnormalities. It is also crucial for people of all ages since it helps maintain the health and normal operation of the body's cells. Folic acid is also essential for the production and repair of DNA, as well as the breakdown of specific proteins. Without appropriate folic acid, the body cannot produce red blood cells effectively, which can result in anemia. It is essential to consume adequate amounts of folic acid through diet or supplementation.

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The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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Answer: Gold Wire

Explanation:

Out of all of these options only gold wire is an element, elements are pure and cannot be broken down by any chemical means

hope it helped, good luck :)

Answer:

Awww! Congrats on the people who helped this person!

Explanation:

:))

The molarity of the phosphorous acid solution is approximately 0.00760 M.To determine the molarity of the phosphorous acid solution, we need to use the balanced chemical equation and the stoichiometry of the reaction between ammonia and phosphorous acid.

The balanced chemical equation for the reaction between ammonia (NH3) and phosphorous acid (H3PO3) is:

3NH3 + H3PO3 -> (NH4)3PO3

From the equation, we can see that the ratio of ammonia to phosphorous acid is 3:1.

Given that 11.91 ml of 0.162 M ammonia solution reacts, we can calculate the number of moles of ammonia used:

Moles of ammonia = volume (in L) x molarity

Moles of ammonia = 0.01191 L x 0.162 mol/L = 0.001930 mol

Since the ratio of ammonia to phosphorous acid is 3:1, we know that the number of moles of phosphorous acid used is one-third of the moles of ammonia:

Moles of phosphorous acid = 1/3 x moles of ammonia

Moles of phosphorous acid = 1/3 x 0.001930 mol = 0.000643 mol

Next, we calculate the molarity of the phosphorous acid solution:

Molarity = moles of solute / volume of solution (in L)

Molarity = 0.000643 mol / 0.08459 L = 0.00760 M

Therefore, the molarity of the phosphorous acid solution is approximately 0.00760 M.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question we have

\(density = \frac{15}{14} \\ =1.0714285 ...\)

We have the final answer as

Hope this helps you

Yes, this statement is generally true. A chlorine atom gains one electron to form an anion with a 1-charge because noble gas configurations are stable.

This is because noble gases have a full valence shell of electrons, which is the most stable electron configuration. By gaining one electron, the chlorine atom achieves the same electron configuration as the noble gas argon, making it more stable. This is why elements tend to gain or lose electrons in order to achieve the same electron configuration as the nearest noble gas.

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To generate 48.0 L of H2 gas at 0.888 atm and 32°C, approximately 30.3 grams of CaH2 are needed according to the given conditions and calculations using the Ideal Gas Law and stoichiometry.

To determine the grams of calcium hydride (CaH2) required to produce 48.0 L of hydrogen gas at a pressure of 0.888 atm and a temperature of 32°C, we employ the Ideal Gas Law. Firstly, converting the temperature from Celsius to Kelvin yields 305.15 K. Using the equation PV = nRT, where P represents pressure, V signifies volume, n denotes moles, R represents the ideal gas constant (0.0821 L*atm/(mol*K)), and T signifies temperature in Kelvin.

Rearranging the equation to solve for n, we find n ≈ 1.44 moles. By employing the balanced chemical equation, we determine that 0.72 moles of CaH2 are required, as 1 mole of CaH2 produces 2 moles of H2. Finally, using the molar mass of CaH2 (approximately 42.1 g/mol), we find that the quantity of CaH2 needed is roughly 30.3 grams.

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The pH of clean water increases when an acid is introduced. The opposite is true if a base is introduced to pure water. A solution's hydronium ion concentration must fall as the concentration of hydroxide ions rises.

If there are more hydrogen ions than hydroxide ions in a solution (i.e., pH pOH), the solution is acidic. Since the concentration of hydrogen and hydroxide ions in pure water is constant, even when the pH changes, the water remains neutral (pH = pOH).

Bases and Acids

An acid is a chemical that, when introduced to pure water, will cause the pH to fall. In a similar way, a base is something that will raise the pH of water by 4.

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Answer:

down

Explanation:

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

An atom consists of electrons, protons, and neutrons. The protons and neutrons are present inside the nucleus of an atom whereas the electrons revolve around the nucleus of an atom.

The number of protons in an atom represents the atomic number of that particular atom. Further, this atomic number determines the place of each atom in the periodic table and its chemical properties.

For example, the mass number of sodium atom is 23 that is number of protons and neutrons. The atomic number of sodium is 11 that means there are 11 protons. The number of neutrons will be 23 - 11 = 12.

the ligand to coordinate anionic compound of oxalate is known as oxalate. Let's take a closer look at the process of synthesis and analysis of an Iron(III)-Oxalate Complex in Experiment 4.What is Experiment 4?The synthesis and analysis of an Iron(III)-Oxalate Complex is referred to as Experiment 4. This experiment involves the conversion of Fe(III) salt into an Iron(III)-Oxalate complex by a complexation reaction of Fe(III) and Oxalate.

The resulting Iron(III)-Oxalate complex is yellow-green in color. The reaction can be represented by the following chemical equation:Fe+3 + 3C2O4−2 → Fe(C2O4)33−This reaction is an example of a complexation reaction, which involves the formation of coordination compounds from metal ions and complexing agents known as ligands. In this case, the ligand is Oxalate, a bidentate ligand with two binding sites to coordinate to the metal ion. This results in the formation of a stable complex with Fe(III).ConclusionIn summary, the ligand to coordinate anionic compound of oxalate in Experiment 4 is oxalate.

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(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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Answer:

a. he was the first to propose that matter is made of atoms

(9) The following statement about Polymer Crystallinity is incorrect : c) Crystallinity is reduced for polymers that are chemically simple and that have regular and symmetrical chain structures ; 10 ) b)  The density of crystalline polymer > Density of amorphous polymer.

9) Polymers have two types of molecular structures: amorphous and crystalline. Amorphous polymers lack an ordered molecular structure and, therefore, a distinct melting point, whereas crystalline polymers have ordered molecular structures and can melt at a specific temperature. In addition to being entirely amorphous, polymers may also exhibit varying degrees of crystallinity.

A polymer with greater crystallinity, for example, has more organized regions in which the chains of molecules are tightly packed together. The degree of crystallinity of a semicrystalline polymer is determined by its density. In the polymer, the crystalline regions are more dense than the amorphous regions, resulting in a correlation between crystallinity and density.

(10) The density of crystalline polymer > Density of amorphous polymer. This is because in the polymer, the crystalline regions are more dense than the amorphous regions. Because the crystalline polymer has a more ordered molecular structure and a greater degree of crystallinity than the amorphous polymer, the density of the crystalline polymer is higher.

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If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.

I looked it for you, hope that helped <3

According to the balanced equation, the reaction of 13.46 g of MgBr2 with 6.9 g of KOH will produce 6.9 g of Mg(OH)2 and 13.46 g of KBr.

The number of moles of MgBr2 and KOH can be calculated using the molar mass of each compound. 13.46g MgBr2 has a molar mass of 184.11 g/mol, so the number of moles of MgBr2 is 0.073 moles. 6.9g KOH has a molar mass of 56.1 g/mol, so the number of moles of KOH is 0.123 moles.

A chemical reaction is a process that involves the rearrangement of atoms or molecules to form new substances. Chemical reactions involve breaking and forming chemical bonds, which leads to the formation of new substances. Chemical reactions typically involve the transfer of electrons between molecules, or the breaking and forming of chemical bonds between atoms. This process usually results in the formation of new substances, as well as the release of energy in the form of heat and light.

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Answer:

3 kilometres

explain:

1 kilometr = 1000 meters

3 kilometres = 3000 meters