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What is the molarity of a solution that contains 1.45 moles of KCl in 1, 250 mL of
solution?

Answer:

The gold foil experiment

El experimento de la lámina de oro

Explanation:

Answer:

Explained below

Explanation:

First of all we need to know that diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration.

Now, the meaning of a substance having higher concentration or lower concentration is that the amount of solute of a given concentration is higher in the higher concentration region than that in the region of lower concentration.

Answer:

As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.

Explanation:

Answer:

0.01 mole

Explanation:

Answer:

Red

Explanation:

Answer:

No 1 is fission

while no 2 is fusion

Fission is splitting on nucleus while fusion is forming heavier nucleus with nuclei

The kind of nuclear reaction that occurs in the following reactions are:

i. nuclear fission

ii. nuclear fusion.

Nuclear reactions are that reactions in which a nucleus or nuclei collides with subatomic particles to form another, different nucleus. There are two types of collisions. Nuclear fission and nuclear fusion.

Nuclear fission is a process when large nuclei split and create small, numerous nuclei. It happens due to the instability of an atom. It split into two daughter nuclei.

Nuclear fusion is a process in which two or more small nuclei combine to create a large, heavy nucleus. The process releases a large amount of energy or can be absorbed.

Thus, the processes are i. nuclear fission

ii. nuclear fusion.

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Answer:

the answe would be (c) temperate continental

Explanation:

Explanation:

The triceps contract to allows the arm to extend and flex while throwing

Answer:

D

Explanation:

In the Rb atom the valence electron is farther from its nucleus than the valence electron of Li is from its nucleus

Answer:

C The water accepts a proton from the hydrogen chloride.

Explanation:

The equation given in this question where hydrogen chloride reacts with water is as follows:

HCI + H2O → CI- + H3O+

From this equation, hydrogen chloride (HCl) loses or donates hydrogen ion (H+) or proton to water (H2O), which accepts it to become hydronium ion. Hence, in a nutshell, water (H2O) accepts a proton (H+) from the hydrogen chloride (HCl) in this reaction.

Answer:

Why hydrogen is the only non-metal elements which loses electron to form positive ions ? ... When hydrogen bonded with most electronegative element then it forms a positive ions but when it bonded with less electronegative element then it forms a negative ion.

Answer:

If a soil test indicates low magnesium, dolomitic limestone can be used to correct both the nutrient deficiency and pH. The value of limestone is in its ability to neutralize soil acidity. Limestone's properties differ considerably, and these differences influence the limestone's ability to neutralize soil acidity.

Explanation:

HAVE A GOOD DAY

Answer:

a. 2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O

b. 1 mol MgCl2/ 1 mol Mg(OH)2

1 mol MgCl2/ 2 mol HCI

Explanation:

a. The reaction of an acid (HCl) with a base (Mg(OH)2) produce water (H2O) and the salt (MgCl2):

_HCl + _Mg(OH)2 → _MgCl2 + _H2O

To balance the Cl:

2HCl + _Mg(OH)2 → _MgCl2 + _H2O

To balance the oxygen:

2HCl + _Mg(OH)2 → _MgCl2 + 2H2O

The reaction is now balanced

2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O

b. Based on the balanced reaction, the moles ratios are:

1 mol MgCl2/ 1 mol Mg(OH)2

1 mol MgCl2/ 2 mol HCI

Answer:

6 mass

Explanation:

because the si unit of gram is mass

Answer:

6.25 gram

Explanation:

Applying,

R = R'([tex]2^{a/n}[/tex])................ Equation 1

Where R = Original mass of the isotope, R' = mass of the isotope left after disintegration, a = Total time, n = half life.

make R' the subject of the equation

R' = R/([tex]2^{a/n}[/tex])................. Equation 2

From the question,

Given: R = 100 gram, a = 20 munites, n = 5 minutes.

Substitute these values into equation 2

R' = 100/([tex]2^{20/5}[/tex])

R' = 100/[tex]2^{4}[/tex]

R' = 100/16

R' = 6.25 gram

Answer:

A few years back I back in 8th grade I head somewhat of a scream underwater, at first I was amazed at the sound but I suddenly realized how physically possible, the only way to make noise under water is to breath in the water and that can drown you, as I heard this I almost immeaditetly bolted out of the water and saw someone either trying to destroy their lungs themselves or being uneducated, they ended up stopping after a bunch of people started staring at them.

Explanation:

Answer:

both the substances will evaporate

Explanation:

Answer:

0.48 mols

Explanation:

to convert moles to mass u need to divide mass by the molar mass of NaCl which is 58.44g/mols.

28g ÷ 58.44g/mol = 0.48 mols

Answer:

Solutions can be solids dissolved in liquids. When you work with chemistry or even cook in your kitchen, you will usually be dissolving solids into liquids. Solutions can also be gases dissolved in liquids, such as carbonated water. There can also be gases in other gases and liquids in liquids.

Explanation:

Answer:

Explanation:

The pH of a solution can be found by using the formula

[tex]pH = - log ([ {H}^{+} ])[/tex]

From the question we have

[tex]pH = - log(3.33 \times {10}^{ - 7} ) \\ = 6.477555...[/tex]

We have the final answer as

Hope this helps you

Answer:

The answer is B

Explanation:

Carbon dioxide is a chemical compound that consists of two oxygen atoms and one carbon atom. Carbon Dioxide (CO2) is a gas with a molecular structure composed of two oxygen atoms and one carbon atom.

Hope this helps!

Answer:

True True False

Explanation:

Answer:

Final pressure = 362.7 Pa

Explanation:

Given that,

Initial volume, V₁ = 930 ml

Initial pressure P₁ = 156 Pa

Final volume, V₂ = 400 mL

We need to find the final pressure. We know that the relation between volume and pressure is inverse i.e.

[tex]V\propto \dfrac{1}{P}\\\\\dfrac{V_1}{V_2}=\dfrac{P_2}{P_1}\\\\P_2=\dfrac{V_1P_1}{V_2}\\\\P_2=\dfrac{930\times 156}{400}\\\\P_2=362.7\ Pa[/tex]

So, the final pressure is equal to 362.7 Pa.

Answer:

Explanation:

Answer: Hello, There! your answer is Below.

D. The formation of a solid from a liquid confirms that a physical

change took place.

Explanation:

The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.

Hope this helps you!!!

Have a great day!!!

When a liquid undergoes solidification and change of phase it is called freezing. The physical change can be confirmed by changes in the state of matter from liquid to solid. Thus, option D is correct.

Physical changes are the modification in the matter or object that can be reversed back to its original state. They do not produce substances that are irreversible.

The change of the phase of the matter from liquid to solid when water substance undergoes freezing is a physical change as no new compound is created and the solidified substance can get converted back to liquid.

Therefore, option D. solid from liquid shows a physical change.

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Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.

Answer:

Spectroscopy — the study of the absorption and emission of light by atoms

Absorption spectrum — represents energy absorbed as dark bands

Atomic spectrum — represents energy emitted or absorbed

during electron jumps

Emission spectrum — represents energy emitted as colored lines

Explanation:

Spectroscopy is an analytical technique to study and analyze using spectrum. It has been the absorption and emission of other light by the atoms. The correct matches are A.1, B. 2, C.3, and D.4.

Spectroscopy is the technique used in chemistry where matter absorbs and emits radiations of a certain wavelength. The absorption spectrum is used to represent absorbed energy in the form of dark bands or lines. Thus, options A.1 and B.2 are correct.

The atomic spectrum is characterized by the black-colored bands that depict the energy absorbed and emitted by an excited atom during electron transitions. Whereas, the emission spectrum shows the colored lines that is the energy emitted when an electron transits from higher to lower energy levels. Thus, options C.3 and D.4 are correct.

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