hello, can someone please help me with this problem ​

Atomic numbers are the numbers possessed by an element in a periodic table. These numbers are used to identify an element and their position in the periodic table.

The atomic number of an element is equal to its proton and electron number but not its neutron

Hence we can conclude that the correct information about the atomic number of an element includes:

• The number of protons

• The element position on the periodic table

When a solute dissolves in water, a solution is formed.

A solute is any substance capable of dissolving in a solvent in order to form a solution.

When a solute dissolves in a particular solvent, it is said to be that solvent-soluble. Otherwise, it is insoluble.

Now, when the solvent in question is water, the substance is said to be water-soluble or water-insoluble as the case may be.

If a solute is water-soluble, then it forms a solution. If the solute is ionic, it does not just form a solution, it dissociates into its component ions in the solution.

If the solute is not ionic, no dissociation occurs in the solution.

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Explanations

Given the following

Mass of potassium carbonate = 22.5grams

Determine the moles of potassium carbonate

Moles of potassium carbonate = mass/molar mass

22.5/138.205|

= 0.1628moles

Since the precipitate formed is aluminum hydroxide, hence the mole of precipitate formed if 3moles off K2CO3 produce 2moles of Al(OH)3 is given as:

Hence the moles of dried precipitate should be formed

Let us take the isotope as E then Z is its atomic number and A is the mass number. Thus, if Z = 42 and A = 98 then the isotope can be seen as [tex]^{98}_{42}E[/tex].

Add the antithesis of the charge imbalance to the number of protons to determine the number of electrons.

For instance, a phosphorus isotope with an atomic number of 15 has a -3 charge, meaning that there are three more electrons than protons in that isotope.

The atomic number should be written as a subscript and the mass number (protons + neutrons) should be written as a superscript to the left of the atomic symbol when writing the symbol for an isotope.

Standard, or “AZE,” notation can also be used to describe isotopes, where A stands for the mass number, Z for the atomic number, and E for the element symbol. To the left of the chemical symbol “E,” a superscript denotes the mass number “A,” and a subscript denotes the atomic number “Z.”

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The volume of a liquid is not substantially affected by variations in pressure. Any pressure increase can only slightly shorten the distance between the densely packed molecules, liquids are incompressible.

Increased pressure occurs as depth increases. The pressure in a liquid is influenced by the mass of the surrounding water above. Due to the near proximity of the molecules in a liquid, pressure exerts itself in all directions.

"Pressure" is described as the thrust (force) applied to a surface per area. The force to effective area is another way to describe it (over which the force is acting).

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From the particles shown, the ones that will have a stronger attraction to each other are those in water H₂O. This is because water has a boiling point of 100°C while that of CO₂ is -78.5. Hence, while both are covalently bonded, the bonds in water are stronger.

It is to be noted that a covalent bond is formed between two atoms by the mutual use of one or more pairs of electrons. The two atomic nuclei attract these electrons at the same time. When the difference in electronegativities of two atoms is too tiny for electron transfer to produce ions, a covalent bond occurs.

The word "covalent bond" first appeared in 1939. The prefix co- denotes jointly, related in action, paired to a lesser degree, etc.; hence, a "co-valent bond" in essence indicates that the atoms share "valence," as defined in valence bond theory.

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The metamorphic rock on high temperatures could melt and result in the formation of Igneous rock

New rock formation happens when there is an increase in temperature or pressure or in some cases both.

On either high temperature or high pressure, the metamorphic rock would melt. The melting of metamorphic rock would result in magma. This magma on cooling solidifies and forms Igneous rock. It is crystalline/glassy in nature.

On the other hand, if igneous rock melts under high pressure or temperature, it would revert back to metamorphic rock.

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Utilize this chemical equation balancer to balance the Al + HCl = AlCl3 + H2 reaction! ... It's possible that the equation 2Al(s) + 6HCl(aq) = 2AlCl3(aq) + 3H2(g) is ionic.

Fuel cells may produce energy, power, and heat using hydrogen. The two industries where hydrogen is currently most widely employed are fertilizer manufacturing and petroleum refining, with the developing markets of utilities and transportation.

Experts disagree that drinking hydrogen water has any hazards. However, they are unsure if its advantages outweigh those of drinking regular water or being hydrated in general. Hyponatremia, which can be fatal, can result from excessive water intake.

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Answer: Right Side

Explanation: The nonmetals or non-metals are a group of elements located on the right side of the periodic table (except for hydrogen, which is on the top left).

Answer: non-metals are on the right side of the periodic table. They are located to the right of the line (usually appears as a dark latter). Note that hydrogen is not located there but it is also a non-metal.

137.6 grams of oxygen are needed to completely burn 27.6 grams of C₂H₂ during the combustion of propane in the equation.

The molar mass of C₂H₂ = 32 g

Molar mass of oxygen = 32 g

Therefore, the moles of propane is given as

27.6/ 32

=0.86 moles

Usually 1 equivalent of C₂H₂ will consume 5 equivalent of oxygen. So, 0.86 moles will consume

0.86 × 5

= 4.3

So, moles of oxygen will be

4.3 × 32

= 137.6 g

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The Rf value is used to produce a final confirmation of the identify of a substance its true sentence

In thin-layer chromatography, the retention factor Rf is used to compare and help identify compounds and the Rf value of a compound is equal to the distance traveled by the compound divided by the distance traveled by the solvent front both measured from the origin and Rf values are used to determine polarity, relative masses, and relative solubility's, among other things

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Answer:

75.114ml

Explanation:

volume = mass÷ density

According to the given statement the molar mass of the gas is 39.400 g/mole.

The mass in grams of one mole of a substance is its molar mass. The molar mass of a substance can be determined by adding the molar masses of its component atoms, as shown in this video. The computed molar mass can then be used to convert the mass and the number of molecules of the substance..

From ideal gas equation we know,  PV = nRT

PV =w/M * RT

n is number of moles = w/M,  

we = weight of gas,

M = molecular weight of the gas

PV = wRT/M

Value of pressure, P = 1atm and standard temperature, T = 298.15K

Value of universal gas constant,

R = 0.082 lit. atm. K⁻¹.mol⁻¹

Weight of gas,

w = 0.8058g and volume of gas,

V = 500mL = 0.5 Liters

Substituting all the value, we get   :

Molar mass = 0.8058* 0.082 * 298.15 / 1 * 0.5

Molar mass = 39.400 g/mole

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The quantity of moles in 57.0grams of RbF is 0.545mol.

Moles is the base unit of amount of substance i.e. the amount of substance of a system which contains exactly 6.022 × 10²³ elementary entities (atoms, ions, molecules, etc.).

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.

No of moles = mass ÷ molar mass

Molar mass of RbF = 85.467 + 18.998 = 104.5g/mol

moles = 57.0g ÷ 104.5g/mol = 0.545mol

Therefore, 0.545moles is the quantity of moles of RbF in 57.0grams of the compound.

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Not adversely but deer population do effects the biodiversity in a way that plant diversity specifically get reduced.

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Answer:

cell wall

Explanation:

plant cell have cell wall and can go through the process of plasmolysis.

they also contain stoma

animal cell are smaller

Fe(OH)₂(s) + O₂(g) +OH → Fe(OH)₃(s) + H₂O balance in basic solution is 4Fe(OH)₂ (s) + O₂(g) + 2H₂O → 4Fe(OH)₃(s)

A basic solution is an aqueous solution containing more OH⁻ ions than H⁺ ion

The unbalanced redox equation is as follows:

Fe(OH)₂(s) + O₂(g) +OH → Fe(OH)₃(s) + H₂O

In the chemical reaction all atoms other than hydrogen and oxygen are balanced and the oxidation number of fe changes from 2 to 3 and the change in the oxidation number is 1 and the oxidation number of fe changes from 0 to -2 and for 2O atoms the change in the oxidation number is 4 and then balance the equation with increase in the oxidation number and with decrease in the oxidation number

Fe(OH)₂(s) and Fe(OH)₃(s) with 4 then,

4Fe(OH)₂(s)+O₂(g) → 4Fe(OH)₃(s)

To balance O atoms, add 2 water molecules on LHS,

4Fe(OH)₂ (s) + O₂(g) + 2H₂O → 4Fe(OH)₃(s)

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The pairs that are likely to form an ionic bond are;

Let us recall that a compound is formed if we are able to join the atoms of two elements together. There are basically three kinds of bonds that we can have in a substance and these are;

If the two elements are now bonded in the compound the properties of each of the atoms is now modified and what we now have is the singular properties of the compound.

We can see a list of several compounds and we  are to find out if the bond that the atoms have between them is an ionic or not. This has been done in the section above and we can see there the compounds that are most likely to have an ionic bond.

Note that in the ionic bond, there is a transfer of electrons from one atom to the other. This can be shown by the use of an arrow. The transfer would always occur from the atom of a metal to the atom of a non metal.

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Answer:

B is the answer

Explanation:

H2SO4 contains:

2H

1S

4O

4 is double of 2

Taking into account the reaction stoichiometry, 121.89 grams of AgI are produced from 43.3 g of calcium iodide.

In first place, the balanced reaction is:

CaI₂ + 2 AgNO₃ → 2 AgI + Ca(NO₃)₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 166.8 grams of CaI₂ form 469.54 grams of AgI, 43.3 grams of CaI₂ form how much mass of AgI?

mass of AgI= (43.3 grams of CaI₂×469.54 grams of AgI)÷ 166.8 grams of CaI₂

mass of AgI= 121.89 grams

Finally, 43.3 grams of CaI₂ form 121.89 grams of AgI.

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The correct formula of  the dicarbon tribromide molecule is shown as [tex]C_{2} Br_{3}[/tex].

The chemical formula is the representation of a compound on paper. It is the way by means we are able show the way that atoms of a compound are connected to each other. We often use this method to show the representation of a compound in way that is somewhat intelligible to someone who needs to understand it.

We are now going to try to see how we could be able to find the correct formula of the compound knowing all the subscripts required in the process.

Now, most importantly, the formula must show the number of atoms of each of the elements that are in the compound. Looking at what we have, we are asked to find the formula of the compound dicarbon tribromide. We already know that there would be two atoms of carbon and three atoms of bromine in the compound.

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The balanced NET ionic equation for the reaction when (NH₄)₂CO₃  and CaCl₂ are mixed in aqueous solution.

  Ca²⁺(aq)  +   CO₃²⁻(aq)     --->   CaCO₃(s)

The reaction is :

(NH₄)₂CO₃        +    CaCl₂  ----->    NH₄Cl      +    CaCO₃

1) the balanced molecular eqaution :

(NH₄)₂CO₃(aq)     +    CaCl₂(aq)  ----->    2NH₄Cl(aq)      +    CaCO₃(s)

2) split strong electrolytes into ions : complete ionic equation

2NH₄⁺  +  CO₃²⁻   +   Ca²⁺   +   2Cl⁻  ----->    2NH₄⁺    +   2Cl⁻  +  CaCO₃

3) eliminate the spectator ions on both sides of ionic equation:

CO₃²⁻(aq)   +   Ca²⁺(aq)  --->   CaCO₃(s)

4) The net ionic equation is :

Ca²⁺(aq)  +   CO₃²⁻(aq)     --->   CaCO₃(s)

Thus, The balanced NET ionic equation for the reaction when (NH₄)₂CO₃  and CaCl₂ are mixed in aqueous solution.

  Ca²⁺(aq)  +   CO₃²⁻(aq)     --->   CaCO₃(s)

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Plasmids help you obtain the copies of the gene you need.

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Atoms are made up of protons and neutrons in the center, with electrons circling in orbitals outside the nucleus.

As a result, option c is the right answer.

A complicated collection of electrons with negative charges grouped in specified shells around a positive-charged nucleus is an atom. This nucleus, which is made up of protons and neutrons, holds the majority of the atom's mass (except for common hydrogen which has only one proton). Every atom is nearly the same size.

The electron is a specific location where an electrons is most likely to be found. We can't see where an electrons is, but we can utilize its wave equation to calculate the likelihood that it is in a specific place.

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The formula on the left, which consists of two sodium ions and one sulfide ion, is the equation for the dissociation of sodium sulfide in water. The ions split from one another as the chemical dissociates in water. On the right side of the equation, there are 2 Na+ ions and 1 S2- ion.

Na2S(s) ---> 2Na+(aq)  +  S2- (aq)

Being a strong acid, hydrogen bromide, or HBr, has the equation HBr(aq) -> H+(aq) + Br- for its dissociation (aq). The equation for hydrogen flouride, or HF, is HF(aq) -> H+(aq) + F- because it creates a weak acid (aq). Weak acids create equilibrium, which is why the two-way arrow is there!

The hydrogen bromide ionizes and dissolves in water as follows:

H3O+(aq) + Br- = HBr(g) + H2O(l) (aq)

A soluble ionic molecule called lead(II) nitrate, Pb(NO3)2, completely dissociates in water to produce lead(II) cations, Pb2+, and nitrate anions, NO3. Hydrogen sulfide, H2S, is bubbled through the solution in order to precipitate the lead(II) cations.

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Answer:

im pretty sure its transition metals

Explanation:

Condensation is a chemical reaction of synthesis. It represents two organic molecules producing one organic molecule and a water molecule.

Condensation reactions are reactions in which two or more substances combine together chemically to produce a larger molecule with the elimination of a small molecule such as water, ammonia, or HCl.

Condensation reactions are important reactions in the formation of polymers.

Polymers are large organic molecules that are composed of smaller repeating units known as monomers.

An example of a condensation reaction is the reaction in which two amino acids are linked together by a peptide bond to form a dipeptide. A water molecule is also eliminated.

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