if you are 19 years of age how old are you in seconds

Lewis electron dot notation is a method for representing the valence electrons in an atom. In this notation, the valence electrons are shown as dots around the symbol of the element. The number of dots represents the number of valence electrons.

The Lewis electron dot notation is a useful tool for understanding the chemical behavior of elements. It allows us to see how many valence electrons an atom has and how they are distributed. This information can be used to predict the types of chemical bonds that an atom is likely to form. For example, the Lewis electron dot notation for nitrogen is:
N: ·
Nitrogen has five valence electrons, so there are five dots around the symbol.
In addition to representing individual atoms, the Lewis electron dot notation can also be used to represent molecules. In a molecule, the dots represent the shared electrons between the atoms.  The Lewis electron dot notation is an important concept in chemistry that helps us to understand the properties and behavior of atoms and molecules.

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Answer:

Each Y atom needs three electrons to complete its octet by forming three bonds to hydrogen. There is one unshared pair of electrons and three bonding pairs of electrons. The bonds in the product are covalent.

Explanation:

Recall that group 5A elements contain five electrons in their outermost shell. These five electrons consists of a lone pair and three electrons that can form three bonds with hydrogen to give YH3 where Y is the group 5A element.

The YH3 molecule contains one lone(unshared) pair of electrons as well as three bonding pairs of electrons. The compounds are covalent.

The northern slope will have the least precipitation if winds blow against a mountain from the south.

This is referred to as the degree of steepness on a surface such as rocky areas etc.

When wind blows on the southern part of a mountains, it gets stuck which is why the northern slope have the least precipitation.

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Answer:

The mixture (B + C) will change from liquid to gases.

This is because at constant temperature, the mixture will evaporate.

Graph 1 is expected to be assigned for the mixture (B + C)

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Answer:

The final temperature of the copper would be 311.3°C.

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Answer:Please see answers in the explanation column

Explanation:

In a  mixture of salt, sand, iron fillings, and large rocks in a big bucket.

The process of separation is as follows:

Ist step ---

Use of magnet : Because Irons are attracted to magnet, Introducing a magnet to the mixture will cause the iron fillings to cling to the magnet leaving the other constituents behind

2nd Step

we eliminate the large rocks by carefully Sorting or picking them out since they are large and visible or we use a MESH  or Sieve  and carry out the separation by pouring  the rock, salt and  sand mixture on top of the mesh with continuous shaking so as to filter the smaller particles,The smaller particles will pass through the mesh while the bigger rocks remains on top.

3rd Step

We are left with the salt and sand. we will then introduce water to mix the salt and sand. salt dissolves completely in water while the sand settles as the bottom of the container. We can then separate the  sand by  decantation and then filtration to remove any left over sand.

4th step

Evaporation is then carried out on the salt solution to separate the salt from water.

The minimum entropy change of the heat-supplying source is -0.87 kJ/K.

In this case, given the initial conditions, we first use the 10-% quality to compute the initial entropy.

S₁ = 1.485  +  (0.1)(5.6865) = 2.0537 kJ/kg K

The entropy at the final state given the new 40-% quality:

S₂ = 1.4337  +  (0.4)(5.7894) = 3.7495 kJ/kg K

m₁ = 0.026/(0.001057   +  0.1 x 1.002643) = 0.257 kg

m₂ = 0.026/(0.001053   +  0.4 x 1.158347)  = 0.056 kg

ΔS + S₁  - S₂  + S₂m₂  - S₁m₁  -  sfg(m₂  -  m₁)  > 0

ΔS + 2.0537 -  3.7495 + (3.7495 x 0.056)  -   (2.0537 x 0.257)  - 5.6865( 0.056 - 0.257)  >  0

ΔS > -0.87 kJ/K

Thus, the minimum entropy change of the heat-supplying source is -0.87 kJ/K.

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Answer:

Cardiac muscle cells are located in the walls of the heart, appear striated, and are under involuntary control. Smooth muscle fibers are located in walls of hollow visceral organs, except the heart, appear spindle-shaped, and are also under involuntary control.

Explanation:

Answer:

the ruling party if The People's Republic of China

Explanation:

Known as CCP, founded in 1921

Answer:

The Communist Party of China, often referred to as the Communist Party or Party in mainland China, is the ruling party of the People's Republic of China and the second largest political party in the world. The current General Secretary of the 19th CPC Central Committee is Xi Jinping. The party was founded in the period of the Republic of China, led by Chen Duxiu and Li Dazhao. It was founded in August 1920 and called itself the Socialist Party. On July 23, 1921, the Communist Party was formally established. In 1922, it joined the Comintern to receive guidance and assistance, and cooperated with China The Kuomintang cooperated and jointly launched the National Revolutionary Movement. After the collapse of the first Kuomintang-Communist cooperation in 1927, the two parties engaged in a 10-year military struggle. Since the 1930s, the Communist Party of China has gradually shaken off the influence of the Comintern, and has been replaced by a local faction headed by Mao Zedong. Subsequently, in 1931, China's first communist regime established and ruled by the Communist Party was established.

Explanation:

Answer:

D.

I guessed

Explanation:

Answer: Delta

Explanation:

D. a bond between two atoms that have equal electronegativities

Covalent bonds involve 2 atoms sharing electrons.

Covalent Bonds

There are 3 types of bonds: metallic, ionic, and covalent. Metallic bonds occur between 2 metals that exist in a "sea of electrons." Ionic bonds have high electronegativity differences and occur between a metal and a nonmetal. Finally, as stated above, covalent bonds occur when 2 atoms share their electrons. Covalent bonds usually occur between two nonmetals. However, there are 2 types of covalent bonds: polar and nonpolar.

Nonpolar Bonds

Both polar and nonpolar bonds involve the sharing of electrons; however, polar bonds share electrons unequally. This is caused by an electronegativity difference greater than 0.5. When two atoms have equal electronegativities, they share the electrons equally. This creates a nonpolar bond.  

Answer:

What's the gas given in the question??

The mole ratio between sodium nitrate and sodium oxide is 2:1.

The mole ratio between two or more components of a reaction is the stoichiometric number of moles of each component.

The stoichiometric number of mole of a species of a chemical equation is the coefficient of the species when the equation is balanced.

A balanced equation is one in which the number of atoms of elements in the equation is conserved before and after the reaction.

Looking at the equation:

\(2NaNO_3 + PbO -- > Pb(NO_3)_2 + Na_2O\)

The number of atoms of each element before and after the reaction is the same.

The coefficient of sodium nitrate is 2.

The coefficient of sodium oxide is 1.

Thus, the mole ratio between sodium nitrate and sodium oxide is 2:1.

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When 1 mole of sodium chloride is mixed with 4 mole of magnesium chloride, the number of chloride ion present will be 5.4198 x \(10^{24}\) molecules

1 mole of sodium chloride contains 1 mole of chloride ion according to the following equation:

NaCl ---> \(Na^+\) + \(Cl^-\)

4 moles of magnesium chloride will contain moles of chloride ions according to the following equation:

\(4MgCl_2 --- > 4Mg^{2+} + 8 Cl^-\)

The total number of moles of chloride ions in solution:

1+8 = 9 moles.

1 mole of a substance = 6.022 x \(10^{23}\)

Thus, the total number of chloride ions present in the mixture = 9 x 6.022 x \(10^{23}\)

  = 5.4198 x \(10^{24}\) molecules

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Answer: The thermal energy is spread out by the surrounding air.

Explanation:

got it right on test

The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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The research skill that is least important in Rosa's process to decide on investing or not is critical thinking. Thus, the correct option is B.

A research skill may be defined as the overall capability of an individual to explore for, locate, extract, organize, evaluate and utilize or present information that is applicable to a specific topic.

The skills of problem-solving, infographic literacy, and analytical skill are more important to Rosa for deciding on investing in a start-up company or not.

Critical thinking is a skill that deals with the intentional analysis and evaluation of concern and constructing a judgment. This skill plays an important role in determining a valid outcome that makes a significant difference in your area of interest.

Therefore, the research skill that is least important in Rosa's process to decide on investment or not is critical thinking. Thus, the correct option is B.

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Answer:the correct answer is a.

Answer: Substance B has stronger bonds, and it takes more energy to undergo a phase change.

Explanation:

Substances with higher boilings have stronger intermolecular forces, and thus require more energy for phase changes to occur.

Answer:

5 Electrons.

Explanation:

Hello.

In this case, an element in group 15 such as nitrogen has 5 electrons on the outer shell because of its electron configuration. For N, whose atomic number is 7, the electron configuration is:

\(N^7: 1s^2,2s^2,2p^3\)

Whereas energy level 2 has 5 electrons (2 from 2s and 3 from 2p). Next element is phosphorous and its electrons configuration is:

\(P^{15}:1s^2,2s^2,2p^6,3s^2,3p^3\)

It also has 5 electron on the energy level 3 (2 from 3d and 3 from 3p).

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Answer: 2.40 moles of \(CO_2\) will be formed in the reaction.

Explanation:

Given values:

Moles of \(C_2H_2\) = 1.20 moles

The given chemical equation follows:

\(2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O\)

By the stoichioemetry of the reaction:

If 2 moles of \(C_2H_2\) produces 4 moles of carbon dioxide

Then, 1.20 moles of \(C_2H_2\) wil produce = \(\frac{4}{2}\times 1.20=2.40mol\) of carbon dioxide

Hence, 2.40 moles of \(CO_2\) will be formed in the reaction.

Answer:

Na2SO4

Explanation:

Chemistry operates on the principle of 'like dissolved like'. This implies that polar solvents dissolve polar substances while nonpolar solvents dissolve nonpolar substances.

This is because, dissolution of a substance in a solvent is as a result of intermolecular interaction between solute and solvent.

Since Na2SO4 is purely an ionic substance and CCl4 is purely a nonpolar solvent, Na2SO4 is least soluble in CCl4.

Answer:

\(m_{sugar}=23.7g\ sugar\)

Explanation:

Hello,

In this case, we can first compute the volume of the sample in mL from the ounces:

\(8oz*\frac{29.5735mL}{1oz} =236.6mL\)

Thus, with the volume of the sample, we can compute the amount of sugar given the 10 g of sugar per 100 mL of soft drink as shown below:

\(m_{sugar}=236.6mL*\frac{10g\ sugar}{100mL}\\ \\m_{sugar}=23.7g\ sugar\)

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Answer:

  -172.6 °C

Explanation:

You want to know the Celsius equivalent of the temperature 100.6 K.

The relation is ...

  C = K - 273.15

  C = 100.6 -273.15 = -172.55

The temperature is -172.55 °C, about -172.6 °C.

__

Additional comment

We have rounded to tenths, because that is precision of the temperature given. If you use 273 as the conversion constant, you will get -172.4.

Answer:

12000j

mass=1500kg

velocity=4m/s

Kinetic Energy (K E) = 1/2 mv^2

=1/2*1500(4^2)

=1*750*16

=12000j

B) The theoretical yield of Cl2 for the reaction is 61.4505 grams

C) The percentage yield of the reaction is 93.57%

B) Given the reaction between HCl and Oxygen expressed as:

Calculate the moles of HCl;

Calculate the moles of Oxygen

Since there are 4 moles of HCl, hence the limiting reactant will be HCl

According to stochiometry, you can see that 4 moles of HCl produces 2 mole of Cl2, hence the moles of Cl2 produced will be;

Determin the mass of Cl2 (theoretical yield)

Hence the theoretical yield of Cl2 for the reaction is 61.4505 grams

C) Find the percentage yield for the reaction:

Hence the percentage yield of the reaction is 93.57%

Answer: b- by consuming food that contains calcium

Explanation: