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Answer:

A. An identification of the atoms in a molecule

Explanation:

The chemical formula of a compound is a representation which shows all the elements therein and the mole relationship between them expressed as subscripts.

Therefore, a chemical formula allows us to identify atoms that are within a molecule.

A molecule is a covalent compound that has discrete or separate units.

For example;

         HCl represents 1 mole of hydrogen chloride molecules consisting of 1 mole of hydrogen atoms and 1 mole of chlorine atoms.

Answer:

La masa atómica del hierro es 55.847 gramos por mol.

Explanation:

Las masas molares de [tex]Fe_{54}[/tex], [tex]Fe_{56}[/tex], [tex]Fe_{57}[/tex] y [tex]Fe_{58}[/tex] son 53.940 gramos por mol, 55.935 gramos por mol, 56.935 gramos por mol y 57.933 gramos por mol, respectivamente. La masa atómica del hierro se determina mediante el siguiente promedio ponderado:

[tex]M_{Fe} = \frac{5.82}{100}\times \left(53.940\,\frac{g}{mol} \right)+\frac{91.66}{100}\times (55.935\,\frac{g}{mol})+\frac{2.19}{100}\times \left(56.935\,\frac{g}{mol} \right)+\frac{0.33}{100}\times \left(57.933\,\frac{g}{mol} \right)[/tex]

[tex]M_{Fe} = 55.847\,\frac{g}{mol}[/tex]

La masa atómica del hierro es 55.847 gramos por mol.

Reaction type : Double-Replacement reactions

Given

Reaction

MgCl2 + Li2CO3 → MgCO3 + LiCl

Required

Balanced equation

Reaction type

Solution

Balanced equation

Li2CO3 (s) + MgCl2 (aq) → MgCO3 (s) + 2 LiCl (aq)

Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product  

To predict whether this reaction can occur or not is one of them, the precipitation reaction.

MgCO3 is a precipitation compound

Answer:

Glucose

Explanation:

Photosynthesis is the process of the transformation of the light energy from the Sun into stored chemical energy that can serves as the major source of energy in the food chain

The overall chemical equation for photosynthesis reaction can be presented as follows;

6CO₂(g) + 12H₂O(l) + Light Energy → C₆H₁₂O₆ + 6O₂ + 6H₂O

During cellular respiration, the energy in the glucose, C₆H₁₂O₆, is converted to energy stored in Adenosine Triphosphate (ATP) molecules which are released when the the ATP is converted into Adenosine Diphosphate (ADP)

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy containing ATP

Answer:

Ga2O3 + 6Li ------> 3Li2O + 2Ga

Answer:

1 Ga2O3 + 6Li——-> 3 Li2O + 2 Ga

Explanation:

Answer:

a substance that can dissolve other molecules and compounds, which are known as solutesBecause of its ability to form hydrogen bonds, , meaning that it can dissolve many different kinds of molecules.

Explanation:

Answer:

the Mantle

Explanation:

Answer:

Molten lava

Explanation:

I'm learning the same thing :)

Answer:

В.  No, because the mass of the reactants is less than the mass of the products.

Explanation:

Chemical equation:

NaBr + Cl₂      →      2NaCl + Br₂

The given equation is not balanced because number of moles of sodium and bromine atoms are less on reactant side while more on the product side.

There are one mole of sodium and one mole of bromine atom on left side of equation while on right side there are 2 moles of bromine and 2 moles of sodium atom are present. The number of moles of chlorine atoms are balanced.

Balanced chemical equation:

2NaBr + Cl₂      →      2NaCl + Br₂

Now equation is balanced. Number of moles of sodium , chlorine and bromine atoms are equal on both side.

Answer: Electron

Explanation:

An orbital is a region in an atom where there is a high probability of finding an electron.

Answer:

iron, magnesium, and calcium but low in potassium and sodium.

Answer:

that answer would be A. an expression

Answer:

The pennies represent the particles of the isotope either decaying, or staying the same after each shake.  This is a random process.  

In this lab, the pennies represent the nuclei of radioactive substances

Radioactive substances are the unstable substances as they ahve unstable nuclei and will attain stability after the decay of nuclei in the form of emission of alpha, beta or gamma rays.

In the given lab report, the word pennies is used to represent the nuclei of radioactive substances which undergo radioactive decay or remain same.

Hence pennies is used to represent radioactive substances.

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Answer:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

Explanation:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

Answer:

The sugar water mix is a mixture.

Answer:

Physical change

Explanation:

Because sugar molecules are dispersed within the water but the individual sugar molecules are unchanged

Answer:

Ok to solve this you will need to use the Ideal Gas Law Formula which is as follows:

PV = nRT

P= pressure

V= volume

n= # of moles

R= Universal Gas Constant (0.0821 L x atm/mol x K)

T= Kelvin temperature

1.Simplify the Ideal Gas Law formula to what you need to solve for:

P = (nRT)/ V

2. List all you components as follows (this makes the process easier):

P = ?

V = 45.4 L

n = 0.625 mol

R = 0.0821 L x atm/ mol x K

T = 249 K

To find the Kelvin temperature K = C + 273

3. Plug in all your components in your set up formula:

P = [(0.625 mol)(0.0821 L x atm/ mol x K)(249 K)] / (45.4 L)

4. Cross out all similar units so the only thing left is atm because you are trying to find pressure.

P = [(0.625)(0.0821atm)(249)] / (45.4)

5. Multiply through and simplify

P = 0.28 atm

B. is the correct answer.

Glad I could help!! If you have any other questions just message me. Hopefully this was helpful.

Explanation:

Answer:

C. 0.04 moles per cubic decimeter.

Explanation:

The molar mass of the Iodine is 253.809 grams per mole and a cubic decimeter equals 1000 cubic centimeters. The concentration of Iodine ([tex]c[/tex]), measured in moles per cubic decimeter, can be determined by the following formula:

[tex]c = \frac{m}{M\cdot V}[/tex] (1)

Where:

[tex]m[/tex] - Mass of iodine, measured in grams.

[tex]M[/tex] - Molar mass of iodine, measured in grams per mol.

[tex]V[/tex] - Volume of solution, measured in cubic decimeters.

If we know that [tex]m = 2.54\,g[/tex], [tex]M = 253.809\,\frac{g}{mol}[/tex] and [tex]V = 0.25\,dm^{3}[/tex], then the concentration of iodine in a solution is:

[tex]c = \frac{2.54\,g}{\left(253.809\,\frac{g}{mol} \right)\cdot (0.25\,dm^{3})}[/tex]

[tex]c = 0.04\,\frac{mol}{dm^{3}}[/tex]

Hence, the correct answer is C.

because we could be sick if don't get the shot there is a higher chance to have the flu

Answer:

 ok        ,

Explanation:

     .

Answer:

1.25mol

Explanation:

moles(n)=mass/Mr

Mr of H2O=(1*2)+16

                 =18

n=22.5/18

 =1.25 mol

1.25 mol

The equation for the calculation of mass is as follows:-

[tex]moles(n)=mass(g)/molar mass(g/mol)[/tex]......(1)

Given:-

Mass of water =22.5 g

Molar mass of water=18 g/mol

Subsitute both the values in the equation (1) as follows:-

[tex]n=22.5\ g/18\ g/mol\\=1.25 mol[/tex]

Hence, the value in moles is 1.25 mol.

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Answer:

See explanation

Explanation:

Substances are composed of atoms. The combination of atoms in a substance determines the properties that the substance exhibits.

For instance, if atoms of metals and nonmetals combine, they give rise to ionic substance which are mostly solid and have high melting and boiling points.

On the other hand, atoms of nonmetals combine with each other to form covalent substances having low melting and boiling points and high vapour pressure sometimes.

Similarly, the kind of molecules present in a substance also determine the nature of the substance. For instance, the high boiling point of water is attributed to the polarity of the O-H bond. This explains why it has a much higher boiling point than CH4 of  comparable molar mass but is a non-polar molecule.

The question is incomplete, the complete question is;

Zinc and sulfur react to form zinc sulfide by the equation shown below. How many grams of ZnS can be formed when 12.0 g of Zn reacts with 6.50 g of S? (Atomic mass: Zn = 65.38, S = 32.06).

Answer:

17.5 g of ZNS

Explanation:

The equation of the reaction is;

Zn(s) + S(s) ------->ZnS(s)

Number of moles of Zn = 12.0/65.38 = 0.18 moles

Number of moles of S = 6.50/32.06 = 0.20 moles

Hence Zn is the limiting reactant

If 1 mole of Zn yields 1 mole of ZnS

Then 0.18 moles of Zn also yields 0.18 moles of ZnS

Mass of ZnS produced = 0.18 moles *  97.44 g/mol = 17.5 g of ZNS

Answer:

17.5 g of ZNS

Explanation:

Answer:

It is a metal

Explanation:

One of the properties of metals is that metals are malleable. What we mean by malleability is that the metal can be hammered into sheets that can be used for different applications.

Also, metals can react with chlorine when heated to yield diverse halides. This is true of most metal elements.

Answer:

Use A Nuclear Condenser Add It With A Nuclear Transfer Pipe Conecting With a Tessoract And There You Go!

Explanation:

Answer:

the answer is D

Explanation:

Answer:

a. Cellular Respiration produces more ATP than Anaerobic Respiration.

Explanation:

Cellular Respiration creates a total of 36-38 ATP per round. Anaerobic processes only produce 2 ATP per cycle.

Answer:

Ketone

Explanation:

According to the description of the functional group attached to the hydrocarbon - the first and last of a chain of three carbons are each single bonded to 3 hydrogen (H)atoms; the center carbon is double bonded to an oxygen atom, O - it can be deduced that the functional group is a ketone group.

A ketone is a functional group with the structure R₂-C=O, where the two R are  alkyl or phenyl groups which may be the same or different. The carbon in a double covalent bond with oxygen is called the carbonyl carbon. The two R groups are bonded to the carbonyl carbon in single covalent bonds.

In the hydrocarbon in this question, the two R groups are methyl groups, CH₃ bonded to the carbonyl carbon. The name of the hydrocarbon is propanone and it is a ketone molecule.

Answer:

Ketone

Explanation:

Explanation:

Metal is a better conductor than wood, so a metal spoon could burn

Paul's hand.  So, Sue is incorrect. The metal being good conductor of heat, heats up faster than wood spoon and thus, could burn Paul's hand.

Answer:

there is no limiting reactant.

Explanation:

Given that:

CaF₂  +  Br₂  ----->     CaBr₂  + F₂

From the above equation;

We can see that there is an equal number of moles in the reactant side of the equation.

i.e.

one mole of CaF₂  reacts with one mole of Br₂.

Thus, there is no limiting reactant.

There will be no limiting reactants as the chemical equation has the reactant totally consumed and thus leading to no reactants.

We can see that there's an identical range of moles withinside the reactant aspect of the equation

It is the substance that gets into the chemical reaction.

Thus, there's no proscribing reactant.

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Answer: B

Explanation:

A box rests motionless on the ground. A student is pushing the box to the left with a force of 5 newtons. The force of friction opposes the student's force with a magnitude of 2 newtons in which direction and with It will move left at an increasing speed  will the box move.

speed is defined as the rate at which the position of an object changes in any direction. Speed ​​is measured as the ratio of distance travelled to time. Speed ​​is a scalar quantity because it only has direction and not magnitude.

The mathematical representation of speed is as follows: s = d/t

s is the speed in m.s-1

d is the distance travelled in meters

t is the time in seconds

There are four types of speeds and they are:

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