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Answer:

ka = 2x10⁻⁹

Explanation:

Using the pH we can calculate the molar concentration of H⁺, [H⁺]

Then we use the expression of Ka for the equilibrium of a weak monoprotic acid:

HA ↔ H⁺ + A⁻

Where:

ka = [tex]\frac{[H^+][A^-]}{[HA]}[/tex]

ka =  [tex]\frac{(2.24*10^{-5})(2.24*10^{-5})}{0.25-2.24*10^{-5}}[/tex] =  2x10⁻⁹

Answer:

1. Co

2. C

3. Ba

Explanation:

Answer:

A colloid is a mixture composed of particles in a dispersing medium. A colloid is defined by the size of the particles involved. If the particles in a mixture are on the scale of individual molecules, around 1 nanometer, it is defined as a solution. If the particles are larger than 1,000 nanometers, it is a suspension.

Explanation:

i hope this helps you!

The characteristics of colloids are (i) It is a heterogeneous solution (ii) Two phases are present in this solution (iii) It exhibit Tyndall effect (iv) It also exhibit Brownian movement.

Colloids is also called Colloidal system or Colloidal solutions are mixture in which one substance microscopically dispersed  insoluble particle is suspended throughout another substance.

The characteristics of colloids are:

Thus from the above conclusion we can say that The characteristics of colloids are (i) It is a heterogeneous solution (ii) Two phases are present in this solution (iii) It exhibit Tyndall effect (iv) It also exhibit Brownian movement.

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Answer:

Hydrogen chloride (HCl), a compound of the elements hydrogen and chlorine, a gas at room temperature and pressure. A solution of the gas in water is called hydrochloric acid.

Explanation:

hoped that helped

Answer:

The correct answer would be (d)- The amount of light we see on the moon is increasing

Explanation:

If I got this right then please give me brainliest! If not, let me know the correct answer......:)

Answer:

chemical and physical

When elements form bonds, it changes their chemical and physical properties.

A chemical element is a species of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.

A material that cannot be further decomposed by any chemical reaction is known as a chemical element. Each element's atom has a specific number of protons.

For instance, a carbon atom has six protons compared to the one proton in a hydrogen atom. Ions are created by changing the number of electrons in an element's atom.

Thus, When elements form bonds, it changes their chemical and physical properties.

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Answer:

B

Explanation:

Answer:

16 because carbon atom having usual 6 neutron have a mass number of 12 and that with 7 neutron has mass number of 13

Answer:

A: 60 hours

Explanation:

Answer:

Atoms of metal elements give away electrons in their reactions to form positive ions. The ions formed have a full outer electron shell, so are very stable.

Explanation:

To become stable, the metal atom wants to get rid of one or more electrons in its outer shell. ... Alternately, an atom that loses electrons becomes a positively charged ion (aka cations). The particles in an ionic compound are held together because there are oppositely charged particles that are attracted to one another.

Answer:

yes

Explanation:

Answer:

a

Explanation:

Answer:

4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.

Explanation:

The reaction is as follows

C2H4 + 3 O2 → 2 H2O + 2 CO2

For complete combustion of Ethylene 1 mole of ethylene gives 2 moles of Carbon dioxide.

using unitary method

1 C2H4 => 2CO2

4.46 of C2H4  => 2*4.46 CO2

                         =  8.92 CO2

No of moles  = given mass(w) /molar mass(M)

Molar mass of CO2 = 44g

8.92 = W / 44

W = 8.92 * 44

    = 392.48g

So 4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.

4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.

Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.

Let's consider the reaction for the combustion of ethylene.

C₂H₄ + 3 O₂ → 2 H₂O + 2 CO₂

We can calculate the mass of CO₂ formed by the combustion of 4.46 moles of C₂H₄, considering the following relationships.

4.46 mol C₂H₄ × (2 mol CO₂/1 mol C₂H₄) × (44.01 g CO₂/1 mol CO₂) = 393 g CO₂

4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.

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Answer:

Wind flow and temperature

Explanation:

There is a answer on brainly to this question already

Answer:

I do K12 its wind flow and temp.

Hope this helps,

0Drink0Milk0

Answer:

1. suspencion

2.colloid

Explanation:

Answer:

Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a SUSPENSION.

Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a COLLOID.

Answer:

E. just before it reaches the ground.

Explanation:

The "kinetic energy" refers to the energy when an object moves or is in motion. When the ball leaves the racket, it is considered to have a great amount of kinetic energy. However, this decreases as the ball reaches its maximum height, but the potential energy is at its highest. Upon falling down, its kinetic energy increases but its potential energy decreases.

Provided that there's no air resistance, the speed of falling is even faster for the ball because of gravity and nothing is slowing it down, which means it will have a maximum kinetic energy just before it reaches the ground.

Answer:

30

Explanation:

Given that;

  the compound contains nitrogen and oxygen in the ratio 1:1;

       We can say the compound is NO

Now,

Molecular mass of NO;

 Molar mass of N = 14g/mol

 Molar mass of O = 16g/mol

Molecular mass of NO = 14 + 16  = 30g/mol

Answer:

yes

Explanation:

This can be fixed by multiplying the product contacting nitrogen by 2. o The new chemical equation is N2 +H2 →2 NH3 Reactants Products Nitrogen 2 2 Hydrogen 2 6 Since NH3 is multiplied by a coefficient of 2 there are now 2 nitrogens and 6 hydrogens. The 6 hydrogens come from the 2 multiplied by the subscript of 3.

Answer:

They propagate in materialistic media and non-materialistic media ( space ) .

They propagate in the space at constant velocity , which is 3 × 108 m/s .

They consist of vibrating electric and magnetic fields at certain frequency in phase with each other , perpendicular to each other and perpendicular to the direction of the wave propagation ...

Explanation:

welcome!

The properties of electromagnetic waves are the electromagnetic waves are propagated by oscillating electric fields and magnetic field oscillation at right angles to each other, These waves travel with speed 3×108ms−1 in vacuum. Therefore, option A and B are correct.

The term electromagnetic waves or EM waves are defined as the waves that are produced as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are made up of oscillating magnetic and electric fields.

They are created in different processes and are detected in different ways, but they are not basically different. Radio waves, gamma-rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic radiation.

Thus, option A and B are correct.

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Your question is incomplete, most probably your question was

Select the options that are properties of electromagnetic waves:

A. Electromagnetic waves are propagated by oscillating electric fields and magnetic field oscillation at right angles to each other.

B. These waves travel with speed 3×108ms−1 in vacuum.

C. They are deflected by electric or magnetic field.

D. They can not show interference or diffraction.

Answer:

The table shows element percentages for RaO (radium oxide).

Element %

O 6.61

Ra 93.39

Explanation:

Hope this helps - good luck ^w

answer and Explanation:

the same amount would have to stay in grams, so if 14 grams of nitrogen is formed, then 8 grams of oxygen, add those two together and you get 22. and that's 22 of the 40 grams used, so 40 su

Answer:

silver

Explanation:

Answer:

i guess b is the answer.hope it will help

Answer:

The answer is hydrogen ions

Answer:

[tex]\%LiClO_3=90.4\%[/tex]

Explanation:

Hello!

In this case, since the undergoing chemical reaction is:

[tex]LiClO_4\rightarrow LiCl+\frac{3}{2} O_2[/tex]

It is widely known that when a gas given off from a reaction is collected over water, we can compute its pressure by minusing the total pressure 762 mmHg and the vapor pressure of water at the experiment's temperature (20 °C) in this case 17.5 mmHg as shown below:

[tex]p_{O_2}=762mmHg-17.5mmHg=744.5mmHg*\frac{1atm}{760mmHg}=0.980atm[/tex]

Next, by using the ideal gas equation we compute the yielded moles of oxygen considering the collected 313 mL (0.313 L):

[tex]n_{O_2}=\frac{PV}{RT}=\frac{0.980atm*0.313L}{0.082\frac{atm*L}{mol*K}*293.15K}\\\\ n_{O_2}=0.0128molO_2[/tex]

Now, via the 3/2:1 mole ratio between oxygen and lithium chlorate (molar mass = 90.39 g/mol), we compute the original mass of decomposed lithium chlorate as follows:

[tex]m_{LiClO_3}=0.0128molO_2*\frac{1molLiClO_3}{3/2molO_2}*\frac{90.39gLiClO_3}{1molLiClO_3} \\\\m_{LiClO_3}=0.771gLiClO_3[/tex]

Now, the percentage is computed as shown below:

[tex]\%LiClO_3=\frac{0.771g}{0.853g} *100\%\\\\\%LiClO_3=90.4\%[/tex]

Best regards!

Answer:

because its supose to be 3HCL+3AL___3ALCL+H³

Answer:

Luster: Metals are shiny when cut, scratched, or polished.

Malleability: Metals are strong but malleable, which means that they can be easily bent or shaped. ...

Conductivity: Metals are excellent conductors of electricity and heat.

Three properties of metals are:

Good conductors of electricity and heat: Metals have a high electrical and thermal conductivity, meaning they allow the flow of electricity and heat through them with ease. This property makes metals valuable in various applications, such as electrical wiring and heat transfer.

Malleability: Metals can be easily shaped and molded into various forms without breaking. They can be hammered, rolled, or pressed into thin sheets without losing their structural integrity. This property allows metals to be used in manufacturing processes and the creation of different products.

Ductility: Metals can be drawn into thin wires without breaking. This property makes them suitable for electrical wiring and cable manufacturing, where flexibility is required.

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