Suggest reasons for and against the inclusion of hydrogen in the main group of the periodic table ​

Remember: energy is conserved in a chemical reaction (visualize the reaction and question whether heat lies on reactant side (left) or product side (right))

-exothermic- heat is released (heat is on the product side)

>forming an ionic lattice (SALT)- mixture of Na and Cl results in a more stable ionic lattice, causing this reaction to be exothermic

>burning wood

-endothermic- heat is absorbed (heat is on the reactant side)

> cooking an egg

Answer:

8: D

9: A

10: C

11: B

Answer:

D. Nonmetals with nonmetals, because of difference in electronegativity is below 1.7 ​

Explanation:

The types of atoms that typically form covalent bonds are non-metals with non-metals because of the difference in their electronegativity which is below 1.7.

In some instances, the difference can even be zero when dealing with homonuclear substances.

Answer:

c. A flat board tilted at an angle

Explanation:

form the looks of it, and i dont wanna sound like a flat earther her, cuz im not '-', but the best option here would be the flat board at an angle becasue the earth is tilted and isnt even like it said in the prompt.

Hope this helped and idrc about brainliest :)

The phrase which best describes gravitational attraction is the pull

between objects with mass.

Gravitational attraction is the attraction which occurs between two objects

with mass. The force of attraction has a magnitude which is directly

proportional to the masses of the two objects and inversely proportional to

the square of the distance between the two objects.

This is the reason why option D i9s the most appropriate option as it deals

with pull or attraction.

Read more about Gravitational attraction here https://brainly.com/question/15090289

Answer:

Kp = P (N₂) . P³ (H₂)  /  P² (NH₃)

Explanation:

The reaction for the decomposition of ammonia is given by;

2NH₃ (g) ⇌ N₂ (g) + 3H₂ (g)

The pressure equilibrium constant gives the ratio of the pressure of the product over reactants for a reaction that is at equilibrium.

The pressures of the species are raised to the powers of their respective coefficients.

In this reaction;

Products =  N₂ (g) + 3H₂ (g)

Reactant = 2 NH₃ (g)

The pressure equilibrium constant (Kp) is given as;

Kp = P (N₂) . P³ (H₂)  /  P² (NH₃)

441 g CaCO₃ would have to be decomposed to produce 247 g of CaO

Reaction

Decomposition of CaCO₃

CaCO₃ ⇒ CaO + CO₂

mass CaO = 247 g

mol of CaO(MW=56 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{247}{56}\\\\mol=4.41[/tex]

From equation, mol ratio CaCO₃ : CaO = 1 : 1, so mol CaO :

[tex]\tt \dfrac{1}{1}\times 4.41=4.41[/tex]

mass CaCO₃(MW=100 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=4.41\times 100\\\\mass=441~g[/tex]

Answer:

Butane

Explanation:

Answer:

Butane

Explanation:

Butane is a colorless gas with a faint petroleum-like odor.

Melting point: -138 °C

Answer:

7.38 Liters

Explanation:

moles CO2 = 14.5g/44g/mol = 0.33 mole

At STP 1 mole of any gas occupies 22.4 Liters.

∴0.33 mole CO2 x 22.4 L/mol = 7.38 Liters

Answer:

Drowned

Explanation:

We can use drown here, that sounds appropriate.

Explanation:

If a body reflects only a/few color/s of the visible spectrum by absorbing remaining, it appears in that reflected color/s. In case of water, its tri-atomic (2 atoms of hydrogen and one atom of oxygen) structure does not absorb any colors from the visible spectrum of the light. ... Hence water appears colorless while others do absorb

Due to presence of paired electron in K3[Al(C2O4)3.3H2O , it will show colorless.

Paired electrons would be those in an atom which occur in pairs in an orbital, while un-paired electrons would be those in an atom that occur alone in an orbital.

Such metals were transition elements, meaning their compounds include un-paired electrons. These un-paired electrons easily create excited energy states, allowing photons to be absorbed and color to be produced.

Therefore, due to the presence of paired electrons complex will be colorless.

To know more about paired electron.

https://brainly.com/question/17647839.

#SPJ2

Answer:

[tex]\Delta S_{source}>-1.204\frac{kJ}{K}[/tex]

Explanation:

Hello!

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

[tex]s_1=s_{f,175kPa}+q*s_{fg,175kPa}\\\\s_1=1.4850\frac{kJ}{kg*K} +0.1*5.6865\frac{kJ}{kg*K}=2.0537\frac{kJ}{kg*K}[/tex]

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

[tex]s_2=s_{f,150kPa}+q*s_{fg,150kPa}\\\\s_2=1.4337\frac{kJ}{kg*K} +0.4*5.7894\frac{kJ}{kg*K}=3.7495\frac{kJ}{kg*K}[/tex]

Next step is to compute the mass of steam given the specific volume of steam at 175 kPa and the 10% quality:

[tex]m_1=\frac{0.028m^3}{(0.001057+0.1*1.002643)\frac{m^3}{kg} } =0.274kg\\\\m_2=\frac{0.028m^3}{(0.001053+0.4*1.158347)\frac{m^3}{kg} } =0.0603kg[/tex]

Then, we can write the entropy balance:

[tex]\Delta S_{source}+\frac{Q}{T_1} -\frac{Q}{T_2} +s_2m_2-s_1m_1-s_{fg}(m_2-m_1)>0[/tex]

Whereas sfg stands for the entropy of the leaving steam to hold the pressure at 150 kPa and must be greater than 0; thus we plug in:

Which is such minimum entropy change of the heat-supplying source.

Best regards!

Answer:

Salt water

Explanation:

Please mark me brainliest and thank me.

Answer:

the answer slat water

Explanation:

Answer:

A. The energy of moving particles near a fire

Explanation:

Answer:

Yes

Explanation:

All elements and compounds are regarded as pure substances. Whereas mixtures are classified as impure substances.

The characteristics of pure substances are:

These characteristics perfectly fits those of elements and compounds.

Answer:

Volume required = 0.327 L

Explanation:

Given data:

Volume in L = ?

Molarity of solution = 1.772 M

Mass of BaCl₂ = 123 g

Solution:

First of all we will calculate the number of moles of BaCl₂,

Number of moles = mass/molar mass

Number of moles = 123 g/ 208.23 g/mol

Number of moles = 0.58 mol

Now, given problem will solve by using molarity formula.

Molarity = number of moles / volume in L

1.772 M = 0.58 mol / Volume in L

Volume in L = 0.58 mol  / 1.772 M

Volume in L = 0.327 L

Answer:

The elements mentioned in the series are Na, Mg, Al, Si, and P. It can be seen that all these elements are located in the same period. The atomic number of the mentioned elements are Na-11, Mg-12, Al-13, Si-14, and P-15.

a) There will be an increase in the ionization energy with the increase in the element's atomic number across a period. More energy is needed to withdraw an electron from a completely occupied shell in comparison to an incompletely occupied shell.

The atomic number of Na is 11. When one electron is withdrawn from Na, it gets converted into the inert gas configuration of Ne. Thus, it will require more energy to withdraw the second electron from Na. Hence, Na exhibits the lowest second ionization energy.

b) Across the period, with an increase in the element's atomic number, the atomic radii reduces from left to right. Thus, P exhibits the smallest atomic radius.

c) The metallic nature of the elements reduces from left to right across a period in the periodic table. Thus, P is the least metallic element.

d) Diamagnetic signifies towards the element that exhibits pair electrons in its sub-shells. The electronic configuration of Mg is,

1s2 2s2 2p6 3s2

In Mg, no unpaired electrons are present, while all the remaining elements mentioned exhibit unpaired electrons in their valence shell. Thus, Mg is the diamagnetic element.

Answer:

25% or 0.25 or 1/4

Explanation:

don't know which form you need so here you have all 3

good luck :)

Answer:alkali metals group 1

Explanation:practice and get better

Answer:

Salt!!!

Explanation:

Answer:

Dinitrogen trioxide.

Explanation:

The correct name for the compound [tex]N_2O_3[/tex] is dinitrogen trioxide. The compound [tex]N_2O_3[/tex] also happens to be a covalent compound, and the nomenclature of covalent compounds involves the usage of numerical prefixes such as "mono-" and "tri-".

Since there are two nitrogen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "di-", meaning two, to signify that.

Since there are three oxygen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "tri-", meaning three, to signify that.

Answer:

NH4NO2.

Explanation:

Hello!

In this case, since the by-mass percent of any element (in this case nitrogen) is computed by:

[tex]\%N=\frac{n_N*m_N}{M}*100\%[/tex]

Whereas n is the number of N in the compound, m the atomic mass of nitrogen (14.01 g/mol) and M the molar mass of the compound. Thus, down below we can find the molar mass of each compound and the by-mass percent of nitrogen:

NH4NH2CO2  = 78.07 g/mol

[tex]\%N=\frac{2*14.01}{78.07}*100\%=35.9\%[/tex]

NH4NO2  = 64.06 g/mol

[tex]\%N=\frac{2*14.01}{64.06}*100\%=43.7\%[/tex]

N2O3  = 76.01 g/mol

[tex]\%N=\frac{2*14.01}{76.01}*100\%=36.9\%[/tex]

NH4Cl  = 53.49 g/mol

[tex]\%N=\frac{1*14.01}{53.49}*100\%=26.2\%[/tex]

NH2OH = 33.03 g/mol

[tex]\%N=\frac{1*14.01}{33.03}*100\%=42.4\%[/tex]

In such a way, the compound with the highest percentage of nitrogen by mass is NH4NO2.

Best regards!

Answer:

NH4NO2

Explanation:

The answer is the 2ndone

NH4NO2

Answer:

1.3×10²³ formula unit

Explanation:

Given data:

Mass of CaCl₂ = 23.8 g

Number of formula unit = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 23.8 g/110.98 g/mol

Number of moles = 0.21 mol

1 mole of any substance contain 6.022×10²³ formula unit

0.21 mol × 6.022×10²³ formula unit / 1mol

1.3×10²³ formula unit

Answer:

1 is the correct answer of the question

Answer & Explanation:

Crest is a point in the cycle where maximum or peak amplitude exists. In another way, it is a point on the positive side of a wave where maximum amplitude exits. Trough is a point in the cycle where minimum amplitude exists.

Crest: points A and E

Trough: points C and J

Wavelength is the distance between two crests or two troughs. One example is distance between points A and E.

Frequency is 3 because there are 3 oscillations in 1 second (follow the line from beginning to point D, then D to G, the G to end).

I asked that question on my brainly account to answer your question so the people that answerd my question said this is right I HOPE IT IS!!

1. The highest point or crest of a wave is called a crest, and the lowest point or valley is called a trough.

2. The wavelength of a wave is the distance between its two successive crests or troughs.

3. The frequency of a wave is the number of complete cycles (peak or trough) that occur in a unit time.

1. The highest point or crest of a wave is called a crest, and the lowest point or valley is called a trough. On the other hand, in a transverse wave, the peak and trough will be represented by the places of highest displacement above and lowest displacement below the equilibrium position, respectively.

2. The wavelength of a wave is the distance between its two successive crests or troughs. However, wavelength can be determined by comparing any two locations that are separated by a full circle, such as two successive crests or troughs.

3. The frequency of a wave is the number of complete cycles (peak or trough) that occur in a unit time. If the waves in the diagram are visible within one second, then the frequency will be determined by how many complete cycles were visible within that time.

Learn more about Wavelength, here:

https://brainly.com/question/31143857

#SPJ6

Answer:

yes its c

Explanation:

Answer: mark as Brainliest

10 moles

Explanation:

moles=mass/molar mass, therefore 403.1/(24.31+16)=10

Answer:

10 moles

Explanation:

moles=mass/molar mass, therefore 403.1/(24.31+16)=10

Explanation:

When Sulphuric acid is slowly poured into water in a beaker the beaker becomes hot and this is exothermic reaction

when ammonium chloride is dissolved in water in a beaker the beaker becomes cold and this is endothermic reaction

An example of an exothermic reaction is rusting or iron, nuclear fission. Examples of endothermic reactions are the melting of liquid and the evaporation of water.

A chemical reaction is a process in which one or two substances or compounds, called reactants, react or get mixed with each other and form a totally new compound called a product.

Exothermic reactions are those in which energy is released into the environment after the reaction. The reactant has more energy than the products.

Endothermic reactions are those in which energy is absorbed from the environment. The product has more energy than the reactants.

Thus, rusting on iron or nuclear fission are two examples of exothermic reactions. Liquid melting and water evaporation are two instances of endothermic processes.

To learn more about a chemical reaction, refer to the below link:

https://brainly.com/question/10373907

#SPJ2

Answer:

For you first question about the defined function program:

if ( v ≤ 250 ) {

   set p to (5 + v*.02)

}

elseif ( 250 ≤ v ≤ 800 ) {

   set p to (5 + 2500 + (v - 250)*.02)

}

else {

   set p to (5 + 28000 + (v - 800)*.1)

}

This function will first check if the user has used how many units and decide which category that user falls into.

Then, it uses that information to execute a command to calculate how much money that user should pay for the electricity bill, factoring in the extra demands from the question.

For your second question:

(5 + 2500 + (700 - 250)*.02)

= (3000 + 450*.02)

= (3000 + 9)

= 3009

The customer should have paid 3009 dollars.

Explanation:

Hope this helped!