I will give Brainliest and 30 points to whoever answers first!

Answer:

D: electrones are delocalized

The metallic bond has been characterized with the de localization of the electrons. Thus, option D is correct.

Metallic bond has been the type of inter-molecular force that has been found in between the metal atoms.

Metals atom have been capable of donating the electrons in order to become stable. In the metallic bond, there has been the de-localization of the electrons of p orbitals that has been resulted in the electron cloud for the formation of the metallic bond.

Thus, the metallic bond has been characterized with the de localization of the electrons. Thus, option D is correct.

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Answer:

This question is incomplete

Explanation:

This question is incomplete. However, generally hydronium ion (H₃O⁺) is produced when hydrogen ion (usually from an acid) is attracted to the negative pole of water (which is the oxygen part).

To determine the ratio in this case is simple, the ratio of the new to the original hydronium ion concentration is;

the calculate new concentration of hydronium ion, [H₃O⁺]

pH = -log[H₃O⁺] hence,

[H₃O⁺]  = log⁻¹pH (meaning antilog of pH)

Kindly note that the pH to be used here is 2 + the original pH given

Hence, if the original pH given is 2

The new [H₃O⁺] will be 4

[H₃O⁺] = log⁻¹ 4

= 10000

Same formula should be used to determine the concentration of the original hydronium ion concentration using the original pH given.

Hence, [H₃O⁺] = log⁻¹ 2

= 100

The ratio of the new to the original hydronium ion concentration will be

10000:100

100:1

The ratio of the new to the original hydronium ion concentration when the pH of a solution increases by 2 is; 1: 100

The Hydroxonium ion is similar to the hydrogen ion concentration and is written as;. {H3O+¹}.

The formula for calculating the pH of a solution is;

When the pH increases by 2 units; (e.g., from 3 to 5).

Therefore; By evaluation;

Therefore; 10-⁵/10-³ = 10-².

In essence; the ratio of the new to the original hydronium ion concentration is; 1 : 100

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Answer:

10.88g

Explanation:

The main components of dry air are N2 at 78.08% vol , O2 at 20.95% vol, and Argon at 0.934% vol. We will not be concerned with the lesser components because they will not have a significant effect on our answer.  First we need to find the molar mass of dry air so we use the formula Mass = (percent mass * molar mass of gas) we then plug and chug: MM = (0.7804 * 28.01) + (0.2095 * 31.99)+(0.00934 * 39.95) which gives MM = 28.93 mol/gram

Now that we have the molar mass we use conversion factors to get 0.376g / 28.93mol = 10.88g

Answer:

hope it  helps you❤❤❤

Explanation:

The physical change would be the sugar dissolving in water because no reaction is occurring.

sugar dissolving in warm water is an example of physical change.

physical change is doesn't alter the composition or the identity of the substance .

That's mean when you dissolves sugar in water, after a while the object will be the same which mean that the component doesn't change

Answer:

the answer that best describe the two methods is c

Answer:

Al⁺³ , O⁻²

Explanation:

This is an oxidation reduction reaction (Redox).

Chemical reaction:

4Al + 3O₂   →    2Al₂O₃

The oxidation state on Al and O on left hand side is zero. On right hand side Al is present in +3 oxidation state while O is present in -2 oxidation sate.

Oxygen is reduced and Al is oxidized in this reaction.

The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Answer: deer and a rabbit or zebra

Answer:

jeanne I have to be at work at school

answer:

tehehehe mix red and white!

Explanation:

Answer:

Red and white mixed together makes pink :)

Explanation:

Answer:

Sandstone is a rock comprising mostly of minerals formed from sand. The stone gains its formation throughout centuries of deposits forming in lakes, rivers, or on the ocean floor. These elements group together with the minerals quartz or calcite and compresses. In time, the sandstone is formed by the pressure of these minerals coming together.

Explanation:

Answer:

Sandstone is a rock comprising mostly of minerals formed from sand. The stone gains its formation throughout centuries of deposits forming in lakes, rivers, or on the ocean floor. These elements group together with the minerals quartz or calcite and compresses.

Explanation:

Answer:

In the International System of Units (SI), the standard unit of volume is the cubic metre (m3). The metric system also includes the litre (L) as a unit of volume, where one litre is the volume of a 10-centimetre cube.

Explanation:

i think

Answer:

1,31÷2 =10,11

Explanation:

c10h22+31÷2o2=10co2+11h2o

Answer:

precipitate

Explanation:

Answer:

b

Explanation:

The stone will feel warmer than the glass after 20 minutes.

This can be defined as a process of heat transfer which involves direct contact between the objects.

The stone and the lamp in contact with each other means heat will be transferred to the stone thereby making it warmer and the reason why option B was chosen as the most appropriate choice.

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Answer:

11 yes

12 H2O( water molecules)

13 3H2O( water molecules)

Explanation:

Sry, my phone's a potato, so I didn't read it properly, so I'm not sure about the question 11.

11-yes, they stay together, but they release 3 molecules of OH an H.

12- here it talks about what will happen with OH and H: they will be H2O (water molecules).

13- and here we end it with the informations that we got: 3 fatty acids+ glycerol---> fat+ 3H2O( the 3 H and 3 OH)

Answer:

12.78 kJ

Explanation:

The correct balanced reaction would be

[tex]2CH_3OH\rightarrow 2CH_4+O_2\Delta H=252.8\ \text{kJ}[/tex]

Mass of methanol = [tex]3.24\ \text{g}[/tex]

Moles of methanol can be obtained by dividing the mass of methanol with its molar mass [tex](32.04\ \text{g/mol})[/tex]

[tex]\dfrac{3.24}{32.04}=0.10112\ \text{moles}[/tex]

Enthalpy change for the number of moles is given by

[tex]\dfrac{\text{Number of moles of methanol in the reaction}}{\text{Enthalpy change in the reaction}}=\dfrac{\text{Number of moles in 3.24 g of methanol}}{\text{Enthaply in change in the mass of methanol}}[/tex]

[tex]\\\Rightarrow\dfrac{2}{252.8}=\dfrac{0.10112}{\Delta H}\\\Rightarrow \Delta H=\dfrac{0.10112\times 252.8}{2}\\\Rightarrow \Delta H=12.781568\approx 12.78\ \text{kJ}[/tex]

The change in enthalpy is 12.78 kJ.

When 3.24 g of CH₃OH are decomposed, the change in the enthalpy is 12.8 kJ.

Let's consider the following thermochemical equation.

2 CH₃OH ⇒ 4 CH₄ + O₂    ∆H = 252.8 kJ

First, we will convert 3.24 g of CH₃OH to moles using its molar mass (32.04 g/mol).

[tex]3.24 g \times \frac{1mol}{32.04g} = 0.101 mol[/tex]

According to the thermochemical equation, 252.8 kJ are absorbed when 2 moles of CH₃OH react. The enthalpy change when 0.101 moles of CH₃OH react is:

[tex]0.101 mol \times \frac{252.8 kJ}{2mol} = 12.8 kJ[/tex]

When 3.24 g of CH₃OH are decomposed, the change in the enthalpy is 12.8 kJ.

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Answer:

true

Explanation:

Answer:

Updrafts (and can cause thunderstorms and other violent weather.)

Good luck, hope this helped!

Answer:

a. Leu-Ala-Arg-Phe-Val-Val-Lys .

Explanation:

Hello.

In this case, considering the given data, we notice that the amino acid has a N-terminal Leu, that is why we first discard d. Moreover, considering the data (iii) and (v) we can infer that there are going to be two fragments by which it is possible to reason the proper sequence:

(iii): the amino acid has one section composed by Lys-Phe-Val-Val and another one by Ala, Arg, Leu that is why e is also discarded.

(v): the other two fragments are Ala, Arg, Leu, Phe, that is why b is discarded.

(iii) and (v): given the aforementioned fragments, we can combine them and therefore discard c, that is why the correct sequence is:

a. Leu-Ala-Arg-Phe-Val-Val-Lys .

Best regards.

Answer:

Salt and sand can be separated by mixing the two substances with water. The salt will dissolve into the water, while the sand will settle at the bottom of the mixture.

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

So we have

[tex]density = \frac{24}{3.2} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Water is not a mineral because it is not a solid.

Explanation: If water were turned into ice then it would be considered if water were turned into ice then it would be considered a mineral.

Answer:

Copper and silver should work.

Explanation:

Answer:

Explanation:

Given species;

  Beryllium

  Calcium

   Sulfur

Unknown:

Give the symbol, number of neutrons and the mass number

Solution:

The symbols of the species are;

    Beryllium  -   Be

    Calcium     -  Ca

     Sulfur       -  S

Number of neutrons:

    Beryllium - 5

   Calcium    - 20

   Sulfur       -  16

Mass number :

  Beryllium - 9

    Calcium - 40

     Sulfur -    32

Answer:

1.71x10²⁷

Explanation:

If we sum 1/2 of (3) + 1/2 of (1):

1/2 (3.) C(s) + 1/2O₂(g) ⇌ CO(g), K₃ = √2.10×10⁴⁷  = 4.58x10²³

1/2 (1)   1/2CO₂(g) + 3/2H₂(g) ⇌ 1/2CH₃OH(g) + 1/2H₂O(g), K₁ = √1.40×10² = 11.8

C(s) + 1/2O₂(g) + 1/2CO₂(g) + 3/2H₂(g) ⇌ 1/2CH₃OH(g) + 1/2H₂O(g) + CO(g)

K' = 4.58x10²³ * 11.8 = 5.42x10²⁴

+1/2 (2):

1/2 CO(g) + 1/2H₂O(g) ⇌ 1/2CO₂(g) + 1/2H₂ (g), K = √1.00×10⁵ = 316.2

C(s) + 1/2O₂(g) + H₂(g) ⇌ 1/2 CHO₃H(g) + 1/2CO(g)

K'' = 5.42x10²⁴* 316.2 =

Answer:

Groups II and VI

Explanation:

Hello.

In this case, regarding cations from groups I whose oxidations states are +1, II whose oxidation states are +2 and III whose oxidation states are +3 we can see that when they combine with nonmetallic anions they exchange the charges via subscripts. In such a way, when bonding for instance calcium ions with sulfide ions, we obtain:

[tex]Ca^{2+}S^{2-}=Ca_2S_2[/tex]

Which can be simplified to give:

[tex]CaS[/tex]

If we do the same for oxygen, selenium and tellurium, we find the same form since nonmetals from group VIA could form anions with -2 as they need two electrons to attain the octet, therefore, answer is groups II and VI.

Regards.

Answer:

Approximately [tex]72.9\; \rm ^\circ C[/tex], assuming that this system is insulated properly.

Explanation:

Calculate the amount of energy that the water here has gained (using the increase in its temperature.)

[tex]\begin{aligned} Q(\text{water}) &= c(\text{water}) \cdot m(\text{water}) \cdot \Delta T(\text{water}) \\ &=4.18 \times 400.0 \times (22.2 - 20.7) \approx 2508.0\; \rm J \end{aligned}[/tex].

Assume that this system (copper and water) is well-insulated and has no heat exchange with its surroundings. The amount of energy that water gained should be equal to the of energy that copper has lost. However, the sign of the energy change of copper should be negative because copper had lost energy:

[tex]Q(\text{copper}) = -Q(\text{water}) \approx -2508.0\; \rm J[/tex].

Calculate the temperature change of this piece of copper. Note, that this temperature change is the difference between the initial temperature of the copper piece and the final temperature [tex]22.2\; \rm ^\circ C[/tex] of the system.

[tex]\begin{aligned}\Delta T(\text{copper}) &= \frac{Q(\text{copper})}{c(\text{copper}) \cdot m(\text{copper})} \approx \frac{-2508.0}{130.3 \times 0.38} \approx 50.65\; \rm ^\circ C\end{aligned}[/tex].

Calculate the initial temperature of this piece of copper given its final temperature and the change to its temperature:

[tex]\begin{aligned}T(\text{copper, initial}) &= T(\text{copper, final}) - \Delta T(\text{copper}) \\ &\approx 22.2 + 50.65 \approx 72.9\; \rm ^\circ C\end{aligned}[/tex].