Q25 Apply the Criss-Cross method to determine formulae of the corresponding salt's with
two different examples?​

Answer:

Explanation:

The reaction is 2H2 + O2 -> 2 H2O

So the molar ratio of H2 and O2 is 2:1

No. of moles of H2 = 12.5/2 = 6.25

No. of moles of O2 = 5.14/32 =0.16

As 6.25 > 0.16*2 = 0.32

there will be H2 leftovers of 6.25-0.32 = 5.93 moles or 11.86 grams

Answer:

Explanation:

2 H2 + 1 O2 => 2 H2O

molecular wt of H2 = 2

molecular wt of O2 = 32

so wt of H2 : wt of O2 = 2x2 : 16 = 4 : 16 = 1 : 4

there are way more H2 as 12.5 > 5.14/4 = 1.285

H2 leftovers = 12.5 - 1.285 = 11.215 gram

Table salt does not melt on the stove, it dissolves in water and does not conduct electricity.

There are several substances listed in the table Epsom salt is another one of these substances. It does not melt on a stove, it dissolves in water and also conducts electricity.

Finally, potassium chloride does not melt on the stove, it dissolves in water and it does conduct electricity. These are the experiences one can have with these common substances.

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Answer:

What is this asking for?

Explanation:

I’ll put the answer in the comments

More water is better but not always because access to water or sunlight is harmful to plants.

Water is an important part not only for plants to run the ecosystem it is always important but in a fixed amount not in a large quantity as access to anything is harmful t the environment as access to water can also damage the ecosystem.

Water is said to be life for plants but more water leads them not to grow in a manageable way like access to water in the soil will not allow the soil to hold the plant for growing plants will float on sol and the root will not be able to grow.

Therefore, water is essential always but in fixed quantity not in the large amount in access.

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Answer:

16

multiply 8✖2 and you would get 16.

A stationary front is a boundary between two different air masses that aren't moving relative to each other, but instead are stationary.An air mass is a massive body of air with uniform temperature and moisture characteristics. An air mass takes on the qualities of the area where it forms. As an air mass moves from one place to another, it carries its temperature and moisture content with it.

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Answer: Ionization is complete when sodium hydroxide compound is dissolved in water as it is strong electrolyte.

Explanation:

Strong bases are good electrolytes as they completely dissociate to give ions which help in the conduction of electrical current.

Weak bases are those substances which dissociate partially to give hydroxide ions \((OH^-)\) when dissolved in water.

Example: \(NH_4OH\rightleftharpoons NH_4^++OH^-\)

Strong bases are those substances which dissociate completely to give hydroxide ions \((OH^-)\) ions when dissolved in water.

Example: \(NaOH\rightarrow Na^++OH^-\)

When sodium hydroxide (NaOH) compounds are dissolved in water (H₂O), ionization takes place completely.

Ionization is a process, where compound on dissociation coverts into ions.

Dissociation of NaOH takes place as follow:

NaOH → Na⁺ + OH⁻

Here NaOH, is a strong electrolyte or strong base which completely dissociate into ions and never combine to again form NaOH. Whereas weak electrolytes are those which partially dissociate into ions and gives reaction like as:

AB ↔ A⁺ + B⁻

Complete ionization takes place when sodium hydroxide compounds are dissolved in water.

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Answer:

pH meter measures the degree of acidity or alkalinity in a substance. The H+ ions measures its acidity and the OH- measures the alkalinity.It usually has a voltmeter which is connected to a pH-responsive electrode and a standard electrode which has no degree of variation.

The potentiometric ph meter works functions by measuring the voltage between two electrodes and the result are usually displayed after conversion into the corresponding pH value takes place.

Answer:

The equilibrium temperature of water is 25.6 °C

Explanation:

Step 1: Data given

Mass of the sample of brass = 25.0 grams

The specific heat capacity = 0.375 J/g°C

Mass of water = 250.0 grams

Temperature of water = 25.0 °C

The initial temperature of the brass is 96.7°C

Step 2: Calculate the equilibrium temperature

Heat lost = heat gained

Q(sample) = -Q(water)

Q = m*C* ΔT

m(sample)*c(sample)*ΔT(sample) = - m(water)*c(water)*ΔT(water)

⇒m(sample) = the mass of the sample of brass = 25.0 grams

⇒with c(sample) =The specific heat capacity = 0.375 J/g°C  

⇒with ΔT = the change of temperature = T2 - T1 =T2 - 96.7 °C

⇒with m(water) = the mass of the water = 250.0 grams

⇒with c(water) = the specific heat capacity = 4.184 J/g°C

⇒with ΔT(water) = the change of temperature of water = T2 - T1 = T2 - 25.0°C

25.0 * 0.375 * (T2 - 96.7) = - 250.0 * 4.184 J/g°C * (T2 - 25.0°C)

9.375T2 - 906.56 = -1046T2 + 26150

9.375T2 + 1046T2 = 26150 + 906.56

1055.375T2 = 27056.26

T2 = 25.6 °C

The equilibrium temperature of water is 25.6 °C

Answer:

The weak base is hydroxylamine

Explanation:

The general equilibrium of a weak base (A), is:

A(aq) + H₂O(l) ⇄ HA⁺ + OH⁻

Where Kb is:

Kb = [HA⁺] [OH⁻] / [A]

As both HA⁺ and OH⁻ comes from the equilibrium of A; HA⁺ = OH⁻. So, you can take:

Kb = [OH⁻]² / [A]

OH⁻ is determined from pH, thus:

pOH = -log [OH⁻]

pOH = 14 - pH

pOH = 14 - 9.44

pOH = 4.56

[OH⁻] = 10^{-4.56}

[OH⁻] = 2.75x10⁻⁵

As the concentration of the weak base is 0.0678M:

Kb = [OH⁻]² / [A]

Kb = [2.75x10⁻⁵]² / [0.0678M]

Kb = 1.1x10⁻⁸ = Kb of Hydroxylamine.

The correct answer is A. There are 6 carbon atoms, 12 hydrogen atoms, and 18 oxygen atoms on the reactant side, and 6 carbon atoms, 12 hydrogen atoms, and 18 oxygen atoms on the product side.

This is because of the law of conservation of matter, which states that matter cannot be created or destroyed by a chemical reaction. Therefore, the number of atoms of each element must remain the same on both sides of the reaction.

In this case, the number of carbon, hydrogen, and oxygen atoms must remain the same on both the reactant and product sides.

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Answer:

Explanation:

For the pH value of a buffer solution , the Henderson formula given is as follows

pH = pKa + log [ A⁻] / [AH ]

Now let us discuss about the phosphoric and succinic acid . The phosphoric acid has a pKa value of 2.3 and for succinic acid , the pKa value is 4.2 . The pKa value of succinic acid is more close to 5 . So to achieve pH value of 5 , succinic acid is a better alternative . The value of  [ A⁻] / [AH ]  is kept almost equal to 1 to increase the buffer capacity .

Answer:

kinectic energy

Explanation:

............

There are two types of energy that a massive body posses are kinetic energy and potential energy. When a ball falling through air it posse both of these energy but kinetic energy increases on movement.

Mechanical energy of a body is the sum of potential energy and kinetic energy . Kinetic energy is generated by the movement of the body. Whereas, potential energy forms by virtue of its position.

Kinetic energy increases when a body  starts to move where, the potential energy decreases.

Potential energy of a body raises as its height from the surface increases.  The equation relating mass, height and gravity is p= Mgh.

According to law of conservation of energy the mechanical energy of a  a freely falling body remains constant. When it is at the height from the surface it experience potential energy and when starts to fall it gains kinetic energy.

Therefore, the energy that a ball falling through the air is mechanical energy.

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Answer:

CCl4 - Nonpolar

CH3OH - polar

NH3 - polar

CS2 - Nonpolar

Explanation:

One important thing that we should know is that polarity has to do with the presence of a resultant dipole moment in a molecule.

Dipole moment is a vector quantity, This means that its direction is also taken into account when discussing the dipole moment of molecules.

Hence, symmetrical molecules such as CS2 and CCl4 are non-polar even though they have polar bonds because their dipoles cancel out(zero resultant dipole moment).

On the other hand, NH3 and CH3OH are non-symmetrical molecules hence they possess an overall dipole moment and are polar molecules.

Complete Question:

Match the element with its number of valence electrons.

Column A

1. Helium.

2. Aluminum.

3. Fluorine.

4. Sodium.

Column B

A. 7

B. 1

C. 3

D. 2

Answer:

1. D

2. C

3. A

4. B

Explanation:

In Chemistry, valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

1. Helium: this element is found in group (2) of the periodic table and as such it has 2 electrons in its outermost shell. Therefore, Helium has two (2) valence electrons.

2. Aluminum: it is an element found in group (3) of the periodic table and as such it has 3 electrons in its outermost shell. Therefore, Aluminum has three (3) valence electrons.  

3. Fluorine: it is found in group (7) of the periodic table known as halogens and as such it has 7 electrons in its outermost shell. Therefore, Fluorine has seven (7) valence electrons.

4. Sodium: this element is found in group (1) of the periodic table and as such it has 1 electrons in its outermost shell. Hence, Sodium has two (1) valence electrons.

The mass of H2 produced is 0.657 g.

Generally, The balanced equation is:

2 HCl → H2 + Cl2

The molar mass of HCl is 36.5 g/mol (1+35.5).

First, we need to determine the number of moles of HCl:

23.8 g HCl × (1 mol HCl/36.5 g HCl) = 0.651 mol HCl

From the balanced equation, we can see that 2 moles of HCl produce 1 mole of H2:

2 mol HCl → 1 mol H2

So, we can calculate the number of moles of H2 produced:

0.651 mol HCl × (1 mol H2/2 mol HCl) = 0.326 mol H2

Finally, we can use the molar mass of H2 to convert the number of moles of H2 to grams:

0.326 mol H2 × 2.016 g H2/mol = 0.657 g H2

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The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer:

1) Organic chemistry is the study of the structure, properties, composition, reactions, and preparation of carbon-containing compounds.

2) the branch of chemistry that deals with carbon compounds (other than simple salts such as carbonates, oxides, and carbides).

Explanation:

I gave 2 examples

The net ionic equation for the precipitation of nickel(II) phosphate from aqueous solution is

Na3PO4 + NiCl2 ---> Ni3(PO4)2 + NaCl

Nickel(II) phosphate is an inorganic compound with the formula Ni3(PO4)2. It is a mint green magnetic force solid that is insoluble in water. The cause of nickel (II) phosphate is established when the nickel (II) ion from nickel (II) sulfate unites with the phosphate ion from sodium phosphate as shown in the net ionic equation given below.

Solutions of sodium sulfide and nickel (II) sulfate are assorted. Na2S+ NiSO4→ Na2SO4 + NiS Nickel (II) sulfide is the precipitate.

So we can conclude that Solid nickel (II) phosphate is formed, meaning it is called a precipitate.

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The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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A double bond connecting a carbonyl carbon and an oxygenyl carbon forms a carbonyl group.

A carbon atom is double-bonded to an oxygen atom to form the chemically organic functional group known as a carbonyl group. [C=O] Aldehydes and ketones are the most basic carbonyl groups, and they are typically joined to another carbon molecule. Many aromatic compounds have these structures, which contribute to flavor and fragrance. A functional group called the carbonyl group has a carbon atom double-bonded to an oxygen atom, or C=O. Another meaning of the word "carbonyl" is a metal-bound, neutral carbon monoxide ligand. Tetracarbonyl nickel, or Ni(CO)4, is one illustration. A double bond connecting a carbonyl carbon and an oxygenyl carbon forms a carbonyl group. Two of the carbonyl oxygen's six valence electrons are shared with the carbonyl carbon atom. Two sets of electron lone pairs make up the remaining four valence electrons.

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Answer:

história phkfk

Explanation:

guiooupigjdytrss

When fossil fuels burn, several forms of energy are produced, including:

Heat energy: The primary form of energy released during fossil fuel combustion is heat. Fossil fuels contain chemical energy stored for millions of years, and when they burn, this energy is released in the form of heat. The heat energy can be harnessed for various purposes, such as heating buildings or generating steam to drive turbines.

Light energy: Burning fossil fuels can also produce light energy in the form of flames or glowing embers. This light energy is a byproduct of combustion.

Mechanical energy: Heat generated by burning fossil fuels can be converted into mechanical energy. This is typically achieved by using heat to produce steam, which drives a turbine connected to a generator. The rotating turbine converts the heat energy into mechanical energy, which is further transformed into electrical energy.

Electrical energy: Through the process described above, burning fossil fuels can ultimately generate electrical energy. The mechanical energy produced by the turbine is converted into electrical energy by the generator. Electrical energy can power various devices, appliances, industries, and infrastructure.

It's critical to note that while burning fossil fuels can produce useful forms of energy, it also results in the release of carbon dioxide and other greenhouse gases. This contributes to climate change and environmental concerns. As a result, there is a global shift towards cleaner and renewable energy sources to mitigate these negative impacts.

Answer:

yes

Explanation:

yes it is

When answering questions on the Brainly platform, it is important to always be factually accurate, professional, and friendly. It is also important to be concise and not provide extraneous amounts of detail, while also addressing all aspects of the question at hand. It is necessary to avoid ignoring any typos or irrelevant parts of the question and use the relevant terms in the answer

The procedure involved in standardizing a pH meter involves the following steps, according to the instructions in Appendix C of the lab manual:

Step 1: Twist plastic ring to open position.

Step 2: Remove the storage bottle from the end of the electrode.

Step 3: Obtain about 40 ml of appropriate buffer solutions.

Step 4: Remove the electrode from the distilled water.

Step 5: Place the electrode in a beaker containing buffer solution.

Step 6: Wait for the pH reading to stabilize and press std/enter again to standardize the value.

Step 7: Remove the electrode from the buffer and rinse with distilled water.

Step 8: Repeat steps 5-7 for each buffer solution.

Standardizing a pH meter is an essential process in ensuring accurate and reliable pH measurements. By following the steps outlined in the lab manual and paying attention to all relevant details, one can obtain precise pH readings and achieve the desired results.

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Answer:

K3[Al(C2O4)3] is the answer

Answer:

\(n_{H_2O}=5.94molH_2O\)

Explanation:

Hello there!

In this case, according to the given question about stoichiometry, it is possible for us to calculate the required moles of water that will be produced by 12 grams of hydrogen, by using the molar mass of this reactant (2.02 g/mol as it is diatomic) and the 2:2 mole ratio in the chemical equation by solving the following setup:

\(n_{H_2O}=12gH_2*\frac{1molH_2}{2.02gH_2} *\frac{2molH_2O}{2molH_2} \\\\n_{H_2O}=5.94molH_2O\)

Regards!