An atom or ion has 42 neutrons , 36 protons, and 36 electrons. Identify the element symbol, and determine the mass number and charge for this atom or ion.

Answer:

Cyanobacteria, Azotobactor and Azospirillum are the microbes which is required for nitrogen cycle.

Explanation:

Nitrogen Cycle is a type of cycle in which nitrogen moves from atmosphere to the earth surface and again return back to the atmosphere. Cyanobacteria, Azotobactor and Azospirillum are the microbes which is required for nitrogen cycle. If these microbes is vanished from the environment, the nitrogen cannot be converted into other forms. Carbon is present in the atmosphere in carbondioxide form. This CO2 is used by the plants from atmosphere and make food from it. When these plants are eaten by animals, this CO2 is again release in the atmosphere. Due to global warming, the microbes present in the soil die due to increase in temperature of the soil. Levels of CO2 and CH4 increases if the soil warms up.  With the increase in temperature, soil respiration increases which leads to more emission of CO2 and as a result more global warming occurs.

Answer:

Decrease surface area of marble chips.

Explanation:

Because the reaction goes on the surface  of marble chips, decreasing surface area of marble chips will decrease(slow down) the rate of the reaction.

Answer:

sulfur-35

Explanation:

Sulfur-35 is a radioactive isotope that contains 19 neutrons.

Isotopes are represented with mass numbers. Mass number is the addition of number of proton and number of neutrons.

The number of proton in sulfur = 16

Number of neutron = 19

So, mass number = no. of protons + no. of neutrons

                              = 16 + 19

                              = 35

Hence, the correct answer is sulfur-35.

Answer:

sulfur -35

Answer:

5H3AsO3(aq) + 2MnO4-(aq) + 6H+(aq) → 5H3AsO4(aq) + 2Mn2+(aq) + 3H2O(aq)

Explanation:

Every net balanced ionic equation is composed of a union of two half equations;

The oxidation half equation (indicating electron loss) and the reduction half equation (indicating electron gain). Remember that redox reactions is a process in which electrons are lost and gained by chemical species simultaneously. One specie looses electrons in the oxidation half equation while the other specie gains electrons in the reduction half equation.

The balanced redox reaction equation shows the overall redox process and shows at a glance the total number of elect tribe lost or gained in the redox process. The overall redox reaction equation for the titration described in the question is;

5H3AsO3(aq) + 2MnO4-(aq) + 6H+(aq) → 5H3AsO4(aq) + 2Mn2+(aq) + 3H2O(aq)

Answer:

Within a molecule, the bond angle refers to the angle found between the central atom and its bonded atoms. The total number of bonded atoms and the unshared pairs of electrons within a molecule is the number of electron domains.  

By considering the Lewis formula for methanol it is witnessed that the central carbon atom comprises no unshared pair of electrons and four bonded atoms. Therefore, 4 is the number of electron domains present around the carbon atom, so the bond angle present in the given case will be 109.5 degrees. Thus, the bond angles of H-C-O and H-C-H will equivalent to 109.5 degrees.  

There are two unshared pairs of electrons and two bonded atoms around the central oxygen atom. Therefore, 4 will be the number of electron domains around the atom of oxygen. Thus, a 109.5 degree will be the bond angle found on it, and therefore, the bond angle of C-O-H will also be equivalent to a 109.5 degree. Hence, in the methanol, CH3OH, the bond angles of H-C-H, C-O-H, and H-C-O will be 109.5 degrees.  

Answer:

[tex]M_{CO_2}=0.01665M[/tex]

Explanation:

Hello,

In this case, the Henry's law allows us to relate the molar concentration and partial pressure of a solute (carbon dioxide) in a solution (solvent is water) by:

[tex]M_{CO_2}=H_{CO_2}p_{CO_2}[/tex]

Whereas we introduce the Henry constant, therefore, we can easily compute the molar solubility by:

[tex]M_{CO_2}=p_{CO_2}*H_{CO_2} =0.45atm*3.7x10^{-2}\frac{M}{atm}\\\\M_{CO_2}=0.01665M[/tex]

Regards.

Answer:

The amount of Mg was enough

Explanation:

In this case, we have to start with the reaction between [tex]Mg[/tex] and [tex]CuO[/tex], so:

[tex]CuO~+~Mg~->~MgO~+~Cu[/tex]

If we check the reaction is already balanced. Now, we can do some stoichiometry to calculate the amount of Mg. The first step is the number of moles of [tex]CuO[/tex]. To this we have to calculate the molar mass of [tex]CuO[/tex] first, so:

Cu: 63.55 g/mol and O: 16 g/mol. So, (63.55+16)= 79.55 g/mol.

Now, we can calculate the moles:

[tex]1.525~g~CuO\frac{1~mol~CuO}{79.55~g~CuO}=0.0192~mol~CuO[/tex]

The molar ratio between [tex]Mg[/tex] and [tex]CuO[/tex] is 1:1, so:

[tex]0.0192~mol~CuO=0.0192~mol~Mg[/tex].

Now we can calculate the mass of Mg if we know the atomic mass of Mg (24.305 g/mol). So:

[tex]0.0192~mol~Mg\frac{24.305~g~Mg}{1~mol~Mg}=0.466~g~Mg[/tex]

With this in mind, the student added enough Mg to recover all the Cu.

Note: The HCl doesn't take a role in the reaction. The function of HCl is to dissolve the [tex]CuO[/tex].

I hope it helps!

Answer:

[tex]m=107.8g[/tex]

Explanation:

Hello,

In this case, for the given information, we can compute the gained grams by firstly compute the energy consumed by 14.3 h of being sit relaxed and 9.70 h  of sleeping:

[tex]E_{sit}=120\frac{J}{s}*\frac{3600s}{1h} *14.3h*\frac{1kJ}{1000J} =6177.6kJ\\\\E_{sleep}=83\frac{J}{s}*\frac{3600s}{1h} *9.70h*\frac{1kJ}{1000J} =2898.36kJ[/tex]

Then, we compute the energy used that day:

[tex]E_T=10000kJ-2898.36kJ-6177.6kJ=4203.28kJ[/tex]

Finally, the mass by considering the consumed fat:

[tex]m=\frac{4203.28kJ}{39kJ/g} \\\\m=107.8g[/tex]

Regards.

Answer:

This is true.

Explanation:

Answer:

The 2nd Picture represents the particles in liquids.

Explanation:

The strongest acid is b, the acid of intermediate strength is c and the weakest acid is a Then this leads to the H2S (Hydrogen sulfide). Therefore, option C is correct.

A chemical that, when combined with certain metals, emits hydrogen ions in water and forms salts. Acids have a sour taste and cause certain dyes to turn red.

An acid is a substance that releases hydrogen ions into solution, whereas a base or alkali absorbs hydrogen ions.

In an aqueous solution or water, a weak acid is an acid that has been partially dissociated into its ions. A strong acid, on the other hand, completely dissociates into its ions in water. The pH of weak acids is higher than that of strong acids.

Thus, The strongest acid is b, the acid of intermediate strength is c and the weakest acid is a Then this leads to the H2S, option C is correct.

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The given question is incomplete, the complete question is:

Lead forms two compounds with oxygen. One contains 2.98g of lead and 0.461g of oxygen. The other contains 9.89g of lead and 0.763g of oxygen. For a given mass of oxygen, what is the lowest whole-number mass ratio of lead in the two compounds that combines with a given mass of oxygen?

Answer:

The lowest whole-number mass ratio in the two compounds is 1:2.

Explanation:

There is a need to find the mole ratio between lead and oxygen atoms in order to find the whole-number mass ratio of lead in the two compounds. In the first compound, the given mass of lead is 2.98 grams, the molar mass of lead is 207.2 gram per mole.  

The no. of moles can be determined by using the formula,  

moles = mass/molecular mass

moles = 2.98 g/207.2 g/mol

= 0.0144 moles

The mass of oxygen in the compound I is 0.461 grams, the molecular mass of oxygen is 16 gram per mol.  

moles = 0.461 g /16 g/mol

= 0.0288 moles

The ratio between the lead and oxygen in the compound I is 0.0144/0.0288 = 1:2

On the other hand, in the compound II, the mass of lead given is 9.89 grams, therefore, the moles of lead in compound II is,  

moles = 9.89 g / 207.2 g/mol

= 0.0477 moles

The mass of oxygen given in compound II is 0.763 grams, the moles of oxygen present in the compound II is,  

moles = 0.763 g / 16 g

= 0.0477 moles

The ratio between the lead and oxygen in the compound II is, 0.0477 moles lead /0.0477 moles oxygen = 1:1

Hence, of the two compounds, the lowest ratio is found in the compound I, that is, 1:2.  

Answer:

Alpha- ketoglutarate --> NADP+ --> Oxaloacetate --> O2.

(O2 has the HIGHEST tendency to donate electrons).

Explanation:

Okay, we are to Arrange Alpha- ketoglutarate, Oxaloacetate ,O2, NADP+ and Malate in order of increasing tendency to donate electrons, therefore, the correct order is;

Alpha- ketoglutarate --> NADP+ --> Oxaloacetate --> O2.

And this result can be gotten if we consider these compounds in their oxidative mechanism and check their potential values.

(1). When Alpha- ketoglutarate react with CO2, it gives isocitrate and standard redox potential value of -0.38.

(2). NADP+ with react with two moles of electrons and one mole of hydrogen ion to produce NADPH and standard redox potential value of -0.32.

(3). Oxaloacetate will react with two moles of hydrogen ion and electrons respectively to produce standard redox potential value of -0.18 and Malate.

(4). O2 will react with 4 moles of hydrogen ion and electrons respectively to produce 2 moles of water and standard redox potential value of +0.82.

CONCLUSION: the higher the negative values of the potential, the lesser the electron affinity and vice versa.

Answer:

[tex]\large \boxed{2 \, \%}[/tex]

Explanation:

1. Data

Mass of graduated cylinder              =  47.229 g

Mass of graduated cylinder + water =  71.821  g

Actual volume of water                     = 25.0     mL

2. Calculations

(a) Mass of water

Mass = 71.821 g -47.229 g  = 24.592 g

(b) Volume of water

[tex]\text{Volume} = \dfrac{\text{mass}}{\text{volume }} = \dfrac{\text{24.592 g}}{\text{ 1 g/mL}} = \text{24.592 mL}[/tex]

(c) Percent Difference

[tex]\begin{array}{rcl}\text{Percent difference}&= &\dfrac{\lvert \text{Measured - Calculated}\lvert}{ \text{Calculated}} \times 100 \,\%\\\\& = & \dfrac{\lvert 25.0 - 24.492\lvert}{24.492} \times 100 \, \% \\\\& = & \dfrac{\lvert 0.5\lvert}{24.492} \times 100 \, \%\\ \\& = & 0.02 \times 100 \, \%\\& = & \mathbf{2 \, \%}\\\end{array}\\\text{The percent difference is $\large \boxed{\mathbf{2 \, \%} }$}[/tex]

From the given electron configurations, predict which one is for a representative element is 1s₂, 2s₂, 2p₆,3s₂, 3p₆, 3d₆, 4s₂.

A chemical element is a species of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, unlike chemical compounds, cannot be reduced by any chemical process into simpler molecules.

The most basic form of a material is an element. In general, it cannot be streamlined or divided into smaller parts. A component of an element is an atom. A certain element only has one kind of atom per atom. Protons, neutrons, and electrons, which are subatomic particles, make up atoms.

We begin by applying the aufbau principle to the prediction of the electron configuration of an atom. It instructs us to fill the lowest energy accessible orbital, one electron at a time. It operates through element 18 (argon) in a filling pattern that is simple to predict: 1s, 2s, 2p, 3s, then 3p.

Thus, option C is correct.

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Answer:

Water vapor to dew

Explanation:

Water vapor turns from a gas into a liquid, such as dew on the morning grass.

Answer:

Coca cola, the beverage, is an example of gas - liquid solution, as it has carbon dioxide dissolved in water.

Answer:Crushed, decreased

Explanation:

Just got it right

Answer:

The amount of solute that will dissolve

Explanation:

A P E X

Answer:

[tex]M_{acid}=0.0444M[/tex]

Explanation:

Hello,

In this case, for the given reaction:

[tex]H _2 S O _4 + 2 N a O H \rightarrow 2 _H 2 O + N a _2 S O_ 4[/tex]

We find a 1:2 molar ratio between the acid and the base respectively, for that reason, at the equivalence point we find:

[tex]2*n_{acid}=n_{base}[/tex]

That in terms of concentrations and volumes we can compute the concentration of the acid solution:

[tex]2*M_{acid}V_{acid}=M_{base}V_{base}\\\\M_{acid}=\frac{M_{base}V_{base}}{2*V_{acid}}=\frac{0.697M*28.07mL}{2*220.1mL}\\ \\M_{acid}=0.0444M[/tex]

Best regards.

The concentration of the sulfuric acid solution (H₂SO₄) is 0.0444 M

From the question,

We are to determine the concentration of the H₂SO₄ solution

Using the titration formula

[tex]\frac{C_{A}V_{A} }{C_{B}V_{B}} = \frac{n_{A}}{n_{B}}[/tex]

Where

[tex]C_{A}[/tex] is the concentration of acid

[tex]C_{B}[/tex] is the concentration of base

[tex]V_{A}[/tex] is the volume of acid

[tex]V_{B}[/tex] is the volume of base

[tex]n_{A}[/tex] is the mole ratio of acid

and [tex]n_{B}[/tex] is the mole ratio of base

The given balanced chemical equation for the reaction is

H₂SO₄ + 2NaOH ⟶ 2H₂O + Na₂SO₄

∴ [tex]n_{A} = 1[/tex]

and [tex]n_{B} = 2[/tex]

From the given information

[tex]V_{A} = 220.1 \ mL[/tex]

[tex]C_{B} = 0.697 \ M[/tex]

[tex]V_{B} = 28.07 \ mL[/tex]

Putting the parameters into the equation, we get

[tex]\frac{C_{A} \times 220.1}{0.697 \times 28.07}= \frac{1}{2}[/tex]

∴ [tex]C_{A} = \frac{1 \times 0.697 \times28.07}{2\times 220.1}[/tex]

[tex]C_{A} = \frac{19.56479}{440.2}[/tex]

[tex]C_{A} = 0.0444 \ M[/tex]

Hence, the concentration of the sulfuric acid solution (H₂SO₄) is 0.0444 M

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Answer:

[tex]Keq=\frac{[CH_3OH]}{[CO][H_2]^2}[/tex]

Explanation:

Hello,

In this case, for the described reaction at equilibrium:

[tex]CO(g)+2H_2(g)\rightleftharpoons CH_3OH(g)[/tex]

The analysis of the law of mass action allows us to write the equilibrium expression as shown below:

[tex]Keq=\frac{[CH_3OH]}{[CO][H_2]^2}[/tex]

Which is written considering that carbon monoxide, hydrogen and methanol are all in gaseous phase, for that reason all of them are included in the expression due to homogeneous equilibrium. Moreover, since hydrogen has a stoichiometric coefficient of 2, it is squared in the law of mass action.

Best regards.

Answer:

the answer is B if your looking for the letter

Explanation:

K e q equals StartFraction StartBracket upper C upper H subscript 3 upper H upper O EndBracket over StartBracket upper C upper O EndBracket StartBracket upper H 2 EndBracket superscript 2 EndFraction.

Answer:

c

Explanation:

when the weight of the object is greater than the buoyant force sinking is occurred.

Answer:

1. [tex]10.6\; \rm m[/tex] (one decimal place.)

2.[tex]0.79\; \rm g[/tex] (two decimal places.)

3. [tex]16.5\;\rm cm^2[/tex] (three significant figures.)

Explanation:

The first and second expressions are additions and subtractions. When adding two numbers, the accuracy of the result is given by the number of decimal places in it. The result should have as many decimal places as the input with the least number of decimal places.

For example, in the first expression:

Therefore, the result should be rounded to one decimal place. Note that these units are compatible for addition, since they are all the same. The result should have the same unit (that is: [tex]\rm m[/tex].)

Therefore:

[tex]\rm 5.6792\; m + 0.6\; m + 4.33\; m \approx 10.6\; \rm m[/tex]. (Rounded to one decimal place.)

Similarly:

Therefore, the result should be rounded to two decimal places. Its unit should be [tex]\rm g[/tex] (same as the unit of the two inputs.)

[tex]\rm 3.70\; g - 2.9133\; g \approx 0.79\; \rm g[/tex]. (Rounded to two decimal places.)

When multiplying two numbers, the accuracy of the result should be based on the number of significant figures in it. The result should have as many significant figures as the input with the least number of significant figures. In this expression:

Therefore, the result should have only three significant figures.

The unit of the result is supposed to be the product of the units of the input. In this expression, that unit will be [tex]\rm cm \cdot cm[/tex], which is occasionally written as [tex]\rm cm^2[/tex].

[tex]\rm 4.51 \; cm \times 3.6666 \; cm \approx 16.5\; \rm cm^2[/tex]. (Rounded to three significant figures.)

Answer:

{ Carbon, Oxygen, Nitrogen }

Explanation:

Elements can only have more than an octet of electrons if they demonstrate an expanded octet. This is if they belong to groups in or beyond the third group. Why? Well these elements have d - orbitals that they can rely on to expand the number of electrons that could otherwise be limited. * Here we are focusing on main group elements, P - block elements more specifically. *

Carbon belongs to the 2 group, and thus doesn't have an empty d - orbital. Thus, it can't have more than an octet of electrons. Sulfur belongs to group 3, hence has an empty d - orbital, and can have more than an octet of electrons. Oxygen belongs to the 2 group, and thus doesn't have an empty d - orbital, so it can't have more than an octet of electrons. Same goes for Nitrogen. Bromine belongs to group 4, thus has empty d - orbitals, and can expand further than Sulfur can - it can have more than an octet of electrons.

Solution = { Carbon, Oxygen, Nitrogen }

Answer:

The new volume is less than the initial volume.

The new volume is 322mL

Explanation:

Based on Boyle's law, the pressure of a gas is inversely proportional to its volume under constant temperature. That means if the pressure of a gas is increased, the volume decrease and vice versa. The formula is:

P₁V₁ = P₂V₂

Where P is pressure and V is volume of 1, initial state and 2, final states.

In the problem, the pressure of the gas increased from 4.04atm to 7.17atm, That means the new volume is less  than initial volume because the gas is compressed occupying less volume.

Replacing in Boyle's equation:

4.04atm*571mL = 7.17atmV₂

Beeing the new volume of the compressed gas 322mL

Answer:

C

Explanation:

A- incorrect, not in alphabetical order

B- incorrect, symbol for salt in NA not SA

C- correct

D- incorrect, not based on discovery

Each element represented in the periodic table is represented by a one or two-letter symbol.Hence , Option (C) is Correct.

The periodic table, also known as the periodic table of the elements, is a tabular display of the chemical elements.

It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry.

Each element represented in the periodic table is represented by a one or two-letter symbol.Hence , Option (C) is Correct.

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Answer:

C

Explanation:

They involve losing and gaining of electrons therefore there is a change of state from either solid to aqueous or vise versa

Among the given reactions only two are oxidation-reduction reactions.

Cu (s) + 2AgNO₃ (aq)  →  2 Ag (s) + Cu(NO₃)₂

N₂ (g)   +   3 H₂ (g)   →  2 NH₃

Therefore, option (c) is correct.

The reactions involve the transfer of electrons from one chemical substance to another chemical substance. These electron-transfer reactions are known as redox reactions or oxidation-reduction reactions.

These reactions involved energy changes in the form of heat, light, electricity, etc. The oxidation and reduction reaction is accompanied by the addition of oxygen or hydrogen to different substances.

The first reaction is NaOH (aq) + HCl (aq) → NaCl (aq) + H₂O. In which there is no change in the oxidation number of elements therefore, it is not a redox reaction.

In the second reaction, Cu (s) + 2AgNO₃ (aq)  →  2 Ag (s) + Cu(NO₃)₂   . There is a change in the oxidation state of copper from 0 to +2 and the oxidation number of Ag from +1 to 0. It means both oxidation and reduction are involved in this chemical reaction.

In the third reaction Mg(OH)₂ (s) → MgO (s) + H₂O (l), again there is no change in the oxidation number of Mg. The fourth reaction is the formation of ammonia in which the oxidation number of N changes from 0 to -3 and the H from 0 to +1. Therefore, it is an oxidation-reduction reaction.

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Answer:

PF3 : trigonal bipyramidal

Explanation:

PF3 has 4 domains around the central phosphorus (3 shared pairs and one lone pair of electrons), thus the electron geometry that has 4 domains is tetrahedral not  trigonal bipyramidal

From the options the specie that is incorrectly matched is ( 5 ) ; PF₃ : trigonal bipyramidal

The specie PF₃ is composed of 3 shared pairs and one unshared pair of electrons ( i.e. It has 4 domains ) as seen in the  Lewis structure of  PF₃. therefore  when writing its electronic geometry, it should expressed/written as tetrahedral and not trigonal bipyramidal.

Hence we can conclude that The specie that is incorrectly matched is PF3 : trigonal bipyramidal

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Answer:

183.815

Explanation:

I added the first two, then I used the calculated masses on every third box, and added all of them up.