a magnesium ion has 12 protons and a charge of 2 . how many electrons does it contain?

Answer:

First 1-5 in pics

I can't upload further reactions

Explanation:

6. Lucas test

ROH + Zncl2 +HCl ---> RCl + H2O

7. esterification

R-OH +R’-COOH +H+↔ R’-COOR

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

m is the mass

v is the velocity

From the question we have

\(k = \frac{1}{2} \times 50 \times {1}^{2} \\ = 25 \times 1 = 25\)

We have the final answer as

Hope this helps you

If an astronaut travels to Mars, the mass of the astronaut will decrease on Mars when she arrives. The correct option is B.

The force of gravity is a force that is responsible for the presence of everything object and human in their place. It gives weight to an object. Without gravity, everyone will be floating in the air.

The force of gravity is different in different places. Like on the earth, there is a strong force of gravitation. On the moon, there is the less gravitational force. In mars, there is less gravitation force than on earth.

Because there is less gravitational force on Mars than on the earth, so the weight of the astronaut will be lower on Mars than on the earth.

Thus, the correct option is B. The mass of the astronaut will decrease on Mars.

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One atom of the generic element xx has a radius of 181 pm, and its unit cell is a face-centered cubic structure. The volume of the unit cell will be  (512.8 pm)³

To calculate the volume of the unit cell in a face-centered cubic (FCC) crystal, we need to consider the arrangement of atoms within the unit cell. In an FCC structure, there are atoms at each of the eight corners of the cube and an additional atom at the center of each face.

The diagonal of a face of the unit cell is equal to four times the atomic radius (2r), and it can be calculated as follows:

Diagonal = 4 * atomic radius = 4 * 181 pm = 724 pm

Now, let's calculate the length of the side of the unit cell (a). For a face-centered cubic structure, the length of the diagonal is related to the length of the side (a) by the following relationship:

Diagonal = √2 * a

Rearranging the formula, we have:

a = Diagonal / √2

Substituting the value of the diagonal, we get:

a = 724 pm / √2

Now we can calculate the value of a:

a = 724 pm / 1.414 (approximately) = 512.8 pm

Once we have the length of the side of the unit cell, we can calculate its volume (V) by raising the length to the power of three:

V = a³

Substituting the value of a, we get:

V = (512.8 pm)³

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Answer:

No, the student is not correct. The earth may have a lot of water... but not every part of water is drinkable. Most water is filled with bacteria and or viruses making it not suitable to drink! :)

Explanation:

HOPE THIS HELPS! BRAINLIEST? :)

Answer:

The beginning

Explanation:

In a nuclear reaction, the  rate of decay is fastest at the beginning of the process.

There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.

In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.

In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.

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Answer:

Well its actually the movement of tectonic plates under the earths surface that when the slide along each other, pull away from each other, or push up against each other they create earth quakes.

Explanation: yes.

Surface processes such as erosion, movement, weathering, and the deposition of sediment can modify surface features, such as mountains, or create new features, such as canyons.

Have a great day!

The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.

Geoscience investigates the processes that shape the Earth's surface, the resources humans utilize, and how water and ecosystems are related. It covers much more than just rocks and volcanoes. Chemistry, physics, biology, and arithmetic, as well as other scientific disciplines, are used in geoscience.

The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.

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All of the following are qualitative tests that are often used to identify unknown ionic compounds except titration.

Qualitative tests are conducted to determine the presence or absence of certain ions or compounds in a sample based on their characteristic reactions. Common qualitative tests include flame tests, precipitation reactions, color changes, and gas evolution tests.

Titration, on the other hand, is a quantitative technique used to determine the concentration of a specific substance in a solution by reacting it with a standardized solution of another substance. It is not typically used as a qualitative test for identifying unknown ionic compounds.

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The pH of a buffer solution containing 0.25 M NH3 and 0.45 M NH4Cl can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([NH4Cl]/[NH3]), where pKa is the dissociation constant of NH4+ (9.25 at 25°C).

The concentration ratio [NH4Cl]/[NH3] is 0.45/0.25 = 1.8. Plugging these values into the equation gives pH = 9.25 + log(1.8) = 9.62.
If 2 mL of 0.2 M NaOH is added to 75 mL of this buffer, the new concentration of NH3 will be 0.25 M and the new concentration of NH4Cl will be 0.45 M + (2 mL/1000 mL)(0.2 M) = 0.494 M. The new concentration ratio [NH4Cl]/[NH3] is 0.494/0.25 = 1.976. Plugging this ratio into the Henderson-Hasselbalch equation gives pH = 9.25 + log(1.976) = 9.68.

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Oxygen and silicon are the two most abundant elements in the Earth's crust, making up approximately 75% of the crust by weight.

The Earth's crust is composed of various elements, but two of the most abundant ones are oxygen and silicon. Oxygen is the most abundant element on Earth, and it makes up about 47% of the Earth's crust by weight. It is found in minerals like quartz, feldspar, and mica, and is an essential component of the Earth's atmosphere and biosphere.

Silicon is the second most abundant element in the Earth's crust and accounts for about 28% of its weight. It is found in minerals such as quartz, feldspar, and mica, and is also a key component in many human-made products, including computer chips and solar panels.

Together, oxygen and silicon make up approximately 75% of the Earth's crust by weight. Other significant elements include aluminum, iron, calcium, sodium, and potassium, while trace elements such as copper, zinc, and gold are present in small amounts. Understanding the composition of the Earth's crust is important for fields such as geology, mineralogy, and environmental science.

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Ca is the correct answer. Maybe

Answer:

nitrogen and hydrogen

Its molecular mass is 17g

Explanation:

Ammonia = NH3

nitrogen= 14g

hydrogen= 1g × 3 =3

14+3=17

Explanation

To find the molar mass of sulfur dihydride, you will need to find the sum of all the atomic masses making up sulfur dihydride.

sulfur dihydride is H2S.

Atomic mass of H = 1,00784 u

Atomic mass of S = 32,065 u

Molar mass = (1.00784 x 2) + 32,065 = 34.081 g/mol

Answer

34.081 g/mol

Oil becomes a political issue because some countries control the supply of oil to make more money.

Oil becomes a political issue for many reasons such as its scarcity, the power of the oil-rich countries, and the international politics of oil. The answer option that best explains how oil becomes a political issue is that some countries control the supply of oil to make more money.

Oil is a valuable commodity in the world today, and many countries depend on it for their economic growth and development. Some countries that have vast oil reserves use the control of the oil supply as a bargaining chip to make more money. They limit the supply of oil to other countries, thereby creating an artificial scarcity, and as a result, drive up the price of oil. This is a form of political manipulation and can have far-reaching consequences.

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Answer:

Chlorine is more likely to steal a valence electron from sodium.

Explanation:

Sodium is number 11 on the periodic table with one valence electron. Belonging to the first group, it's one of the alkali metal, which are known to be highly reactive. Chlorine is number 17 with seven valence electrons, and it's in the second-to-last group of halogens--also very reactive.

Considering that elements with one valence electron are just about 100% likely to give up electrons to reach a stable state, sodium would be the element that is more likely to lose its valence electron to chlorine. In other words, chlorine would be the electron thief.

Answer:

Las botellas de alcohol vienen en una variedad de tamaños. El estándar es de 750 ml, que también se conoce como "un quinto" porque es 1/5 de galón. Otros tamaños comunes de botellas de alcohol son 50ml, 100ml, 200ml, 375ml, 1L y 1.75L.

Explanation:

Answer:

2H2 + O2 → 2H2O

Double-displacement reaction

too ezyyy

Explanation:

Brighter stars will have a Negative Absolute Magnitude.

The absolute magnitude can be defined as the magnitude that a star would appear to have if it were located at a standard distance of 10 parsecs.

Absolute magnitude is a similar measure that represents how bright an object actually is.

In conclusion, we can say that the brightness of the star Vega is used to define an apparent magnitude of zero.

We can also conclude that Stars that has a positive apparent magnitudes appears to the normal eye to be dimmer than Vega, while stars that has negative apparent magnitudes will appear to be brighter than Vega.

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The volume of gas is 3,949.31 litre, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm.

The ideal gas law is also called as perfect gas law. It is the relation between the pressure P, volume V, and temperature T of a gas.  

Given:

Volume of gas = ?

Number of moles (n) = 1.74 moles

Temperature (T) = 273K

Pressure (P) = 1 atm

R (gas constant) = 8.314

By an ideal gas equation

PV = nRT

By putting above value in ideal gas equation, we get

1 × V = 1.74 × 8.314 × 273

V = 3,949.31 litre

Thus, The volume of gas, in L is 3,949.31 litre, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm.

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Copper used in electric wires comes in two flavors (isotopes): Cu-63 and Cu-65. Cu-63 has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, Cu-65, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu is 64.93 amu.

Average atomic mass = sum of masses of isotopes multiply by  % of abundance

Cu - 63, mass =  62.9298 amu,   % abundance = 69.09 %

Cu - 65, mass m2 = ?   % abundance = 30.91 %

average atomic mass = 63.546 amu

average atomic mass = ( 62.9298 × 0.6909 ) + ( m2 × 0.3091 )

63.546 =  ( 62.9298 × 0.6909 ) + ( m2 × 0.3091 )

m2 = 64.93 amu

Thus, Copper used in electric wires comes in two flavors (isotopes): Cu-63 and Cu-65. Cu-63 has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, Cu-65, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu is 64.93 amu.

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Answer:

the Germany scientist Alfred Wagner describes fold mountains that are found in The world are the same also geological similarity that occur between this continent are the same for example the rock that are found in brazil are the same of that of south africa.

In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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It is difficult to give a grade out of 100 without knowing the specific requirements and grading criteria for the essay. However, this essay presents a clear understanding of the topic of chlorine in water treatment, providing a well-rounded discussion on both the chemical and ethical aspects of using chlorine. The essay presents a clear introduction, body, and conclusion and uses specific examples to support the claims made. The writing is clear and easy to understand, and the essay is well-organized and flows well. However, it would be beneficial if the essay would have had a stronger thesis statement and a more detailed conclusion. Overall, this essay would likely receive a high grade.

Answer: Mechanical Energy

Explanation:

    To produce electricity, a generator needs an input of mechanical energy. Mechanical energy is a combination of potential energy and kinetic energy. Generators use this to create electricity to power light bulbs, technological devices, and more!

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For the first reaction, \(\Delta S_{\text{univ}}\) is negative and the reaction will not be spontaneous. For the second reaction, \(\Delta S_{\text{univ}}\) is positive and the reaction will be spontaneous.

For the first reaction:

\(\Delta H^\circ_{\text{rxn}}\) = -95 kJ

\(\Delta S^\circ_{\text{rxn}}\)= 0.157 J/K

T = 298 K

Using the equation \(\Delta S_{\text{univ}} = \Delta S^\circ_{\text{rxn}} - \frac{\Delta H^\circ_{\text{rxn}}}{T}\):

\(\Delta S_{\text{univ}}\) = 0.157 J/K - (-95 kJ / 298 K) = 0.489 J/K

Since \(\Delta S_{\text{univ}}\) is positive, the reaction will be spontaneous.

For the second reaction:

\(\Delta H^\circ_{\text{rxn}}\) = 0.95 kJ

\(\Delta S^\circ_{\text{rxn}}\) = 0.157 J/K

T = 855 K

Using the equation \(\Delta S_{\text{univ}} = \Delta S^\circ_{\text{rxn}} - \frac{\Delta H^\circ_{\text{rxn}}}{T}\):

\(\Delta S_{\text{univ}}\) = 0.157 J/K - (0.95 kJ / 855 K) = -0.013 J/K

Since \(\Delta S_{\text{univ}}\) is negative, the reaction will not be spontaneous.

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A ball rolling down a hill has both Kinetic and potential energy. Kinetic energy is due to motion. So if the ball is rolling down it has kinetic energy. Potential energy is the stored energy that is waiting to be used. Now, if you allow it to roll down the hill, it changes that potential energy into kinetic energy (it gets less high and starts to roll faster).

To find the volume of ethyl alcohol required, we can use the formula:

Volume = Mass / Density

Given that the mass of ethyl alcohol required is 65.3 g and the density of ethyl alcohol is 0.790 g/cm3, we can substitute these values into the formula to find the volume.

Volume = 65.3 g / 0.790 g/cm3

To simplify the units, we can convert the volume from cm3 to mL by using the conversion factor: 1 cm3 = 1 mL.

Volume = (65.3 g / 0.790 g/cm3) * (1 cm3 / 1 mL)

Calculating the expression within the parentheses gives:

Volume = 82.78 cm3 / 1 mL

Therefore, the volume of ethyl alcohol required is 82.78 mL.

Note: It is important to pay attention to the significant figures in the given values and carry them through the calculations to maintain accuracy in the final result.

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