Which statement is true about writing chemical formulas of covalent compounds?.

The compound formed when magnesium oxide reacts with water is magnesium hydroxide (Mg(OH)₂).

Magnesium oxide (MgO) is an ionic compound consisting of magnesium cations (Mg²⁺) and oxide anions (O²⁻). When it reacts with water (H₂O), the oxygen atom in water attracts the magnesium cation, leading to the formation of magnesium hydroxide.

The reaction can be represented as follows:

MgO + H₂O → Mg(OH)₂

In the resulting compound, magnesium hydroxide, there are two hydroxide ions (OH-) for every magnesium ion (Mg²⁺). The chemical formula Mg(OH)₂ represents this ratio.

Magnesium hydroxide is an alkaline compound and is commonly used as an antacid to treat heartburn and indigestion. It is also used in various industrial applications.

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Answer: A

Explanation:

Answer:

The answer is A

Explanation:

Answer:

0.5M is the answer.

Explanation:

1M solution is the solution containing 1mole solute dissolved per litre of solution.

Using unitary method,

1000cc gives 1M.

1cc gives 1/1000M.

500 cc gives 500/1000M=0.5M

Hydrochloric acid is a stronger acid than sulphuric acid because the \(pK_a\)value of HCl is smaller than H₂SO₄

Acids are substances that contain hydrogen and can donate H⁺ ions to another substance.

Hydrochloric acid and sulphuric acid both are stronger acids as compared to other acids

HCl dissolves in an aqueous solution to give out H⁺ and Cl⁻ and is completely dissociated.

H₂SO₄ dissolves in an aqueous solution to give out H₃O⁺ and HSO₄⁻ but the ions are partially dissociated

However, HCl is a stronger acid than H₂SO₄ because of the difference between the pKa values of both acids.

The \(pK_a\) value of HCl is -6.3 and the \(pK_a\) of H₂SO₄ is -2.8.

The smaller the \(pK_a\) value, the stronger the acid.

When HCl reacts with baking soda it gives out common salt, water, and carbon dioxide as gas. The reaction is exothermic

\(NaHCO_3 + 2HCl \rightarrow NaCl +H_2O + CO_2\)

Also, when H₂SO₄ reacts with baking soda it gives out sodium sulfate, water, and carbon dioxide as gas. The reaction is exothermic

\(2NaHCO_3+H_2SO_4 \rightarrow Na_2SO_4 +2H_2O + 2CO_2\)

Hence, HCl is a stronger acid than H₂SO₄ because of its \(pK_a\) value.

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Put the numbers into your calculator to find the answer! 90 x 32, then divide by 18.02 x 2. Estimation can tell me that the answer is 79.9, or 80!

The synthesis of nylon requires solutions of 5% hexamethylenediamine and 5% adipoyl chloride. This polymer will form between layers of the solutions. To remove the nylon, one can choose to dissolve it in the 5% hexamethylenediamine or in the 5% adipoyl chloride.

Nylon, a synthetic polymer, is produced from the combination of adipoyl chloride and hexamethylenediamine. This process is called the synthesis of nylon. Nylon is a highly flexible material that is resistant to wear and tear, as well as chemical and heat degradation. The synthesis of nylon requires solutions of 5% hexamethylenediamine and 5% adipoyl chloride, respectively, for the two reactants to be mixed together.

The reaction between these two chemicals is exothermic, which means that it releases heat. The heat generated in the reaction drives the reaction forward, resulting in the formation of nylon. The chemical formula for nylon is (-CO-NH-)n, where n is a large number that reflects the degree of polymerization. To remove the nylon, it is soaked in an acid solution. The acid dissolves the nylon, separating it into its constituent components, which can then be purified and reused.

The most commonly used acid for this process is hydrochloric acid. The process of removing nylon from its solvent is called the "acid-catalyzed hydrolysis of nylon." Nylon is used in a variety of applications, including textiles, packaging materials, and electrical components, among others. Its properties make it ideal for use in applications that require durability, strength, and flexibility. Nylon's physical properties, including its resistance to heat and chemical degradation, make it ideal for use in applications such as electrical insulation, packaging materials, and textiles.

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Answer:

4 and 6

Explanation:

im not sure tho i dont nw much bout cs

Question id : 33544103

Answer:

To calculate the maximum β-energy in the decay of carbon-14 (14C) to nitrogen-14 (14N), we need to use the mass difference between the initial and final nuclei. The β-decay process involves the conversion of a neutron into a proton, emitting a β-particle (electron) and an electron antineutrino.

The mass difference (∆m) between 14C and 14N is given by:

∆m = mass(14C) - mass(14N)

= 14.003241u - 14.003074u

= 0.000167u

The β-energy (Eβ) is related to the mass difference (∆m) by Einstein's mass-energy equivalence equation: E = ∆mc^2, where c is the speed of light.

Eβ = ∆m * c^2

Now, we need to convert the mass difference (∆m) from unified atomic mass units (u) to kilograms (kg) before using it in the equation. The conversion factor is approximately 1.66053906660 × 10^−27 kg/u.

∆m_kg = ∆m * (1.66053906660 × 10^−27 kg/u)

Next, we'll calculate the β-energy by substituting the values into the equation:

Eβ = ∆m_kg * c^2

The speed of light (c) is approximately 2.998 × 10^8 m/s.

Eβ = ∆m_kg * (2.998 × 10^8 m/s)^2

Let's perform the calculations:

∆m_kg = 0.000167u * (1.66053906660 × 10^−27 kg/u)

≈ 2.77273363362 × 10^−29 kg

Eβ = (2.77273363362 × 10^−29 kg) * (2.998 × 10^8 m/s)^2

≈ 2.49344368869 × 10^−13 J

The maximum β-energy in the decay of 14C to 14N is approximately 2.493 × 10^−13 Joules.

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Answer:

(b)  19.9 moles

Explanation:

To convert from moles Al to moles O₂, you need to multiply the given value by the mole-to-mole ratio of each component. This ratio is constructed via the coefficients in the balanced reaction. The desired unit (moles O₂) should be placed in the numerator to allow for the cancellation of units.

2 Al₂O₃ ----> 4 Al + 3 O₂
                    ^         ^            

26.5 moles Al           3 moles O₂
---------------------  x  ----------------------  =  19.9 moles O₂
                                 4 moles Al

Answer:

To achieve stability

Explanation:

Chemical reactions happen so that the atoms of the elements involved in the chemical reaction will become stable and therefore achieve stability.

Answer:

c

Explanation:

Answer:

《●《HOPE IT HELPS YOU 》●》

ANS--> (C)

Answer:

solid iodine chlorine gas

The correct order for ranking solid iodine, liquid bromine, and chlorine gas in order of increasing intermolecular force strength is;  chlorine gas < liquid bromine < solid iodine.

Intermolecular forces are forces that hold substances together in a particular state of matter. Intermolecular forces increase in the order; gases < liquids < solids. Solids have the highest magnitude of intermolecular interaction between particles.

Bearing this in mind, the correct order for ranking solid iodine, liquid bromine, and chlorine gas in order of increasing intermolecular force strength is;  chlorine gas < liquid bromine < solid iodine.

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Answer:

Heat fusion

Explanation:

The energy required to change a solid to a liquid is called the heat of fusion.

Answer:

I would recycle, reuse, and reduce the litter on this already hurt Earth.

Explanation:

Answer:

I can go out and help pick up garbage and i can recycle and not litter and i can reuse all the plastic water bottles i drink.

Explanation:

Im glad you care about mother earth to

To determine the maximum mass of water produced in the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), we need to determine the limiting reactant.

The limiting reactant is the one that is completely consumed and determines the maximum amount of product that can be formed.Let's calculate the moles of each reactant:

Molar mass of HCl = 1.01 g/mol (hydrogen) + 35.45 g/mol (chlorine) = 36.46 g/mol

Moles of HCl = 16. g / 36.46 g/mol = 0.439 mol

Molar mass of NaOH = 22.99 g/mol (sodium) + 16.00 g/mol (oxygen) + 1.01 g/mol (hydrogen) = 39.99 g/mol

Moles of NaOH = 8.45 g / 39.99 g/mol = 0.211 mol

According to the balanced chemical equation:

HCl + NaOH → NaCl + H2O

The stoichiometric ratio between HCl and H2O is 1:1. Therefore, the moles of water produced will be equal to the moles of HCl.

Moles of water = 0.439 mol

Now, let's calculate the mass of water produced:

Molar mass of water = 1.01 g/mol (hydrogen) + 16.00 g/mol (oxygen) = 17.01 g/mol

Mass of water = Moles of water × Molar mass of water

= 0.439 mol × 17.01 g/mol

= 7.47 g

Therefore, the maximum mass of water that could be produced in the reaction is 7.47 grams.

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The result table indicate that A. The solute is a SOLID because it has a DECREASE in the amount dissolved as temperature decreases.

The solubility of a solid solute in a liquid solvent generally decreases as the temperature decreases. This is because the kinetic energy of the solute molecules decreases as the temperature decreases. As the kinetic energy of the solute molecules decreases, they are less likely to have enough energy to escape from the solution and enter the gas phase.

In the table, as the temperature decreases, the concentration of the solute in the solution decreases. This indicates that the solute is a solid and that the solubility of the solute decreases as the temperature decreases.

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Answer:

Reaction Mixture

Explanation:

Using process of elimination;

Product

This is the substance formed as a result of a chemical reaction. Incorrect option

Compound

A substance formed when tow or more elements are chemically bonded together. Incorrect option.

Precipitate

Name given to an insoluble solid formed during a reaction. Incorrect option.

Reaction Mixture

Process of combing two or more substances to form a reaction. Correct option.

The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

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Given :

The density of gold is \(19.3 \ g/cm^3\) and the density of lead is \(11.4\ g/cm^3\) respectively .

To Find :

Which have greater volume .

Solution :

We know , density is given by :

\(\rho=\dfrac{mass}{volume}\)

Now , volume of 5 gm gold .

\(Volume=\dfrac{mass}{\rho}\\\\Volume =\dfrac{5}{19.3}\ cm^3\\\\Volume =0.26\ cm^3\)

Also , volume of 5 gm lead .

\(Volume=\dfrac{mass}{\rho}\\\\Volume =\dfrac{5}{11.4}\ cm^3\\\\Volume =0.44\ cm^3\)

Therefore , volume of lead will be greater than gold.

Hence , this is the required solution .

Answer:

c

Explanation:

Answer:they were poisoned with powdered caffeine (C)

Explanation:

I just took the test! And got all the points for this question :) hoped I could help

Answer:

24

Explanation:

Approximately 154.3 grams of NaNO3 would have to be added to 100 grams of water at 45°C to make a saturated solution of this salt.

Solubility:Solubility refers to the degree to which a given substance dissolves in a given solvent, which is frequently water. The degree of solubility of a substance is defined as the amount of that substance that dissolves in a given quantity of solvent at a specific temperature. The solubility of a substance is determined by its chemical composition and the pressure, temperature, and pH of the solvent.Saturated Solution:A saturated solution is a solution in which the solvent has dissolved all of the solute that it can at a particular temperature and pressure.

Given data are,Mass of water = 100 gTemperature of solution = 45°C (it is mentioned in the question)To find,Mass of NaNO3 needed to make the saturated solution of this salt of the process:According to the solubility curve, the solubility of NaNO3 at 45°C is 94 g/100 g water.

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Considering the definition of electronic configuration and valence shell, the number of core electrons is 1, because the valance shell is the third energy level.

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).  

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1.

Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.

Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom.

This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.

The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on.  

The valence shell is the one where the outermost electrons are found, those electrons that are in the last level. Because it is the outermost shell, it is also the farthest from the atomic nucleus.

The valence shell is one whose electrons are responsible for the chemical properties of an element.

In this case, an atom has 2 electrons in the first energy level, 8 electrons in the second energy level, and 1 electron in the third energy level. So, the number of core electrons is 1, because the valance shell is the third energy level.

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Answer:C

Explanation: I learnet it too but more time ago hope its good

Fluorine does not show exceptional electronic configuration because it does not have any d orbitals to move electrons to. It achieves stability by forming covalent bonds with other atoms.

Fluorine, with an atomic number of 9, has a configuration of 1s2 2s2 2p5. It is one electron short of having a full outer shell, which would make it highly stable. However, fluorine does not show exceptional electronic configuration despite this fact. This is because the exceptional electronic configuration occurs when an electron from the s orbital moves to the d orbital to achieve greater stability. However, fluorine does not have any d orbitals. Its highest energy level is the p orbital, which already has 3 electrons. Therefore, fluorine cannot attain a greater degree of stability by moving an electron to the d orbital. Instead, fluorine achieves stability by forming a covalent bond with another atom, such as hydrogen or another fluorine atom. This sharing of electrons allows fluorine to achieve a full outer shell and become highly stable.
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Solution: The bond between a hydrogen and nitrogen atom is weak bond as compared to the bond between hydrogen and oxygen atom is because of more electronegative nature of oxygen.

Bond strength depends upon the atomic size, electronegativity and bond length. The size of Oxygen atom is larger as compared to Nitrogen because of the stable electronic configuration of nitrogen. The electronegativity of oxygen is higher as compared to Nitrogen due to which the bond between Hydrogen and Oxygen is more polar than bond between Hydrogen and Nitrogen. Higher the bond polarity stronger the bond. This is the reason why the bond between Hydrogen and Nitrogen is weak bond as compared to the bond between Hydrogen and Oxygen.

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