If 18.6 g of methanol is used to dissolve 2.68 g of Hg(CN)2, what is the molality of the solution?

Answer:

6 mass

Explanation:

because the si unit of gram is mass

Answer:

A spectator ion is an ion that does not participate in a chemical reaction and is found in a solution before and after a reaction.

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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:

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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:

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:

True True False

Explanation:

Answer:

D) 6

Explanation:

The balanced equation would be:

6Li + N2 -> 2Li3N

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the correct option is option D.

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

The other characteristic of balanced reaction is that physical state should be written with each compound or molecule on reactant and product side. Physical state should be written in brackets. s means solid, l means liquid, g means gas.

The skeletal equation is

Li + N[tex]_2[/tex] [tex]\rightarrow[/tex] Li[tex]_3[/tex]N

The number of atoms of nitrogen on reactant side is 2 while on product side it is 1 so to balance

Li + N[tex]_2[/tex] [tex]\rightarrow[/tex] 2Li[tex]_3[/tex]N

The lithium atom on reactant side is 1 while on product side it is 6,  so to balance

6Li + N[tex]_2[/tex] [tex]\rightarrow[/tex] 2Li[tex]_3[/tex]N

The coefficient of the Lithium is 6.

Therefore, the correct option is option D.

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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:

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:

Because organism is made up of organs

organs are made up of tissues

tissues are made up of cells

Therefore interaction of cells give outcome to tissue which further show's results in organs and to organ system and then to the body as a whole

Explanation:

Answer: An endothermic reaction occurred

Explanation:

A sample of a compound is added to distilled water in a clean beaker. A reaction occurs and the water temperature drops rapidly which indicates that an endothermic reaction occurred. Hence, option A is correct.

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

An endothermic reaction means that heat is absorbed during this reaction (enthalpy change value has a positive sign).

During the endothermic reaction heat is absorbed from the surroundings (here, water) and hence the temperature of the water in which the reaction is taking place decreases.

Hence, option A is correct.

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Answer:

the answe would be (c) temperate continental

Explanation:

Explanation:

The electron configuration for the first row transition metals consists of 4s and 3d subshells with an argon (noble gas) core. This only applies to the first row transition metals, adjustments will be necessary when writing the electron configuration for the other rows of transition metals.

Answer:

Your lungs are part of the respiratory system, a group of organs and tissues that work together to help you breathe. The respiratory system's main job is to move fresh air into your body while removing waste gases.

Answer:

Supply the body with Oxygen

Explanation:

The respiratory system helps remove waste gases and help you breath

(Your respiratory system consists of your lungs, mouth, and windpipe)

Explanation:

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

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

lanation:    

ExpErnest Rutherford’s experiments involving the interaction of radiation with a magnetic or electric field (Figure 2) helped him determine that one type of radiation consisted of positively charged and relatively massive α particles; a second type was made up of negatively charged and much less massive β particles; and a third was uncharged electromagnetic waves, γ rays. We now know that α particles are high-energy helium nuclei, β particles are high-energy electrons, and γ radiation compose high-energy electromagnetic radiation. We classify different types of radioactive decay by the radiation produced.

Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:

210

84

Po

⟶

4

2

He

+

206

82

Pb

or

210

84

Po

⟶

4

2

α

+

206

82

Pb

Answer:

The gold foil experiment

El experimento de la lámina de oro

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

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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:

There is ionic bonding between Mg2+ ions and NO3− ions. Which of the following claims about a binary compound in which the bonding is ionic is most likely to be scientifically valid? Both elements in the compound are metals.

Answer:

The answer is D.

Explanation:

A: not correct: one element is a metal and the other is a non-metal.

B: not correct: Fr could be combined with Cl

C: not correct: They are transferred not shared.

D: correct: Non-metals have a higher electronegativity in comparison to the metals with a low electronegativity which results in a great change in electronegativity.

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.

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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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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:

both the substances will evaporate

Explanation:

Answer: The new pressure is 3 psi.

Explanation:

Given: [tex]P_{1}[/tex] = 12 psi,         [tex]T_{1} = 20^{o}C[/tex]

[tex]P_{2}[/tex] = ?,          [tex]T_{2} = 5^{o}C[/tex]

Formula used is as follows.

[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\\\frac{12 psi}{20^{o}C} = \frac{P_{2}}{5^{o}C}\\P_{2} = \frac{12 psi \times 5^{o}C}{20^{o}C}\\= 3 psi[/tex]

Thus, we can conclude that the new pressure is 3 psi.

Answer:

Red

Explanation: