Describe what happens in the cell before the chemical reaction.

Answer:

12

Explanation:

the 4 by the element symbol O multiplied by the 3 on the outside of the parentheses

Answer:

[tex]\boxed {\boxed {\sf C. \ 12 \ oxygen \ atoms }}[/tex]

Explanation:

We are given the chemical formula:

[tex]Fe(ClO_4)_3[/tex]

There are 3 elements here:

The question asks for the number of oxygen atoms, so we can just focus on the O in the formula.

The O has a subscript of 4, indicating there are 4 oxygen atoms in the compound. But the compound is also enclosed in parentheses with a subscript of 3. Therefore, there are 3 of the compounds with 4 oxygen atoms.

We can multiply 3 and 4.

There are 12 oxygen atoms.

Answer:

Filtrate: Mixture of salt and water.

Residue: rock pieces

Answer:

Salt solution will be the filtrate

and the rock pieces will be the residue.

Explanation:

This is because salt is soluble in water and hence

it cannot be filtered out of water giving as a salt solution as the filtrate and since the rock pieces are not soluble in water they are left out and they become the residue.

The molecular formula : Al₂Cl₆

Given

20.2% by mass of Aluminum and 79.8% by mass of Chlorine.

Required

the molecular formula

Solution

Aluminium (Ar=27 g/mol)

[tex]\tt \dfrac{20.2}{27}=0.748[/tex]

Chlorine(Ar=35.5 g/mol)

[tex]\tt \dfrac{79.8}{35.5}=2.248[/tex]

mol ratio Al : Cl =

[tex]\tt \dfrac{0.748}{0.748}\div \dfrac{2.248}{0.748}=1\div 3[/tex]

So the empirical formula = AlCl₃

(Empirical formula)n=Molecular formula

(27+3.35.5)n=267

(133.5)n=267⇒n=2

The molecular formula : Al₂Cl₆

Answer:

121

Explanation:

add 1+120 to get answer

Answer:

95/36 Kr or A

Explanation:

In the given nuclear fission reaction, X represents ⁹⁵₃₆Kr. Therefore, the correct option is option A.

Nuclear fission is the splitting of a nucleus of heavy atoms, such that of plutonium or uranium, into two roughly equal mass fragments. A significant amount of energy is released during the process. The core of an atom splits into two nuclei that are lighter during nuclear fission.

When the nucleus is excited by a variety of particles (such as neutrons, protons, deuterons, and alpha particles) or by electromagnetic radiation takes the form of gamma rays, the process may occur spontaneously or be induced.  In the given nuclear fission reaction, X represents ⁹⁵₃₆Kr.

Therefore, the correct option is option A.  In the given nuclear fission reaction, X represents ⁹⁵₃₆Kr.

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Your question is incomplete but most probably your full question was,

Answer:

help with what...

..

........

Answer:

Deeper water, where too little sunlight penetrates for photosynthesis, is called the aphotic zone. Surface water dissolves oxygen from the air, so there is generally plenty of oxygen in the photic zone to support organisms. Water near shore usually contains more dissolved nutrients than water farther from the shore

Explanation:

Answer:

Most of the atom is empty space. The rest consists of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. The nucleus is small and dense compared with the electrons, which are the lightest charged particles in nature.

Answer:

0.47 g

Explanation:

From the question given above, we obtained the following information:

4.20 g of nitrogen occupies 100 L.

We can obtain the mass of nitrogen that occupied 11.2 L by doing the following:

4.20 g of nitrogen occupies 100 L.

Therefore, Xg of nitrogen will occupy 11.2 L i.e

Xg of nitrogen = (11.2 × 4.2) / 100

Xg of nitrogen = 0.47 g

From the calculation made above, 0.47 g of nitrogen will occupy 11.2 L

Answer:

Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.

Answer:

On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table. So convinced was he of the soundness of his periodic law that he left gaps for these elements in his table.

Answer:

Explanation:

Sodium chloride has a high melting and boiling point

There are strong electrostatic attractions between the positive and negative ions, and it takes a lot of heat energy to overcome them. Ionic substances all have high melting and boiling points.

Answer:

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)

Answer:

75.924 g

Explanation:

To answer this question we first need to calculate the molar mass of Ga₂(SO₃)₃:

Molar Mass of Ga₂(SO₃)₃ = (Molar Mass of Ga)*2 + (Molar Mass of SO₃)*3

Molar Mass of Ga₂(SO₃)₃ = (69.72 g/mol)*2 + (80.06 g/mol) * 3

Then we convert 0.20 moles to grams, using the molar mass of Ga₂(SO₃)₃:

Mass of 0.20 moles of Ga₂(SO₃)₃ is 75.924 g

It is defined as the ratio of given mass over molar mass.

Given:

Number of moles= 0.20 moles

To find:

Mass=?

We need to calculate molar mass of Ga₂(SO₃)₃ first:

Molar Mass of Ga₂(SO₃)₃ = (Molar Mass of Ga)*2 + (Molar Mass of SO₃)*3

Molar Mass of SO₃ = Molar Mass of S + (Molar Mass of O)*3 = 80.06 g/mol

Molar Mass of Ga_2(SO_3)_3 = (69.72 g/mol)*2 + (80.06 g/mol) * 3

Molar Mass of Ga₂(SO₃)₃ =  379.62 g/mol

Then we convert 0.20 moles to grams, using the molar mass of Ga₂(SO₃)₃:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} \\\\\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}=0.20 moles*379.62 g/mol\\\\\text{Given mass}=75.92 grams\\[/tex]

Thus, the mass of 0.20 moles of Ga₂(SO₃)₃ is 75.92 grams.

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Answer:

50 N ( left)

Explanation:

Given data:

The force on right side = 450 N

The force on left side = 500 N

Net force = ?

Solution:

F (net) = 500 N - 450 N

F (net) =  50 N ( left)

Answer:

[tex]T_S=-1.09\°C[/tex]

Explanation:

Hello!

In this case, since the freezing point depression for a solution is computed via:

[tex](T_S-T_W)=-imK_f[/tex]

Whereas TW is the freezing temperature of water, TS that of the solution, i the van't Hoff's factor (3 for K2S as it ionizes properly), m the molality of the solution and Kf the freezing point constant of water. Thus, we plug in to obtain:

[tex](T_S-0\°C)=-3*0.195m*1.86\frac{\°C}{m}\\\\T_S=-1.09\°C[/tex]

Best regards!

The correct answer is -1.088. (Don't forget the negative sign).

Answer:

At Equilibrium

[COCl₂] = 0.226 M

[CO] = 0.054 M

[Cl₂] = 0.054 M

Explanation:

Given that;

equilibrium constant Kc = 1.29 × 10⁻² at 600k

the equilibrium concentrations of reactant and products = ?

when 0.280 moles of COCl2(g) are introduced into a 1.00 L vessel at 600 K. [COCl²]

Concentration of  COCl₂ = 0.280 / 1.00 = 0.280 M

COCl₂(g) ---------->  CO(g)   +  Cl₂(g)

0.280                      0                0  ------------ Initial

-x                             x                 x

(0.280 - x)               x                 x   ----------- equilibrium

we know that; solid does not take part in equilibrium constant expression

so

KC = [CO][Cl₂] / COCl₂

we substitute

1.29 × 10⁻² = x² / (0.280 - x)

0.0129 (0.280 - x) = x²

x² = 0.003612 - 0.0129x

x² + 0.0129x - 0.003612 = 0

x = -b±√(b² - 4ac) / 2a

we substitute

x = [-(0.0129)±√((0.0129)² - 4×1×(-0.003612))] / [2 × 1 ]

x = [-0.0129 ± √( 0.00017 + 0.01445)] / 2

x = [-0.0129 ± 0.1209] / 2

Acceptable value of x =[ -0.0129 + 0.1209] / 2

x = 0.108 / 2

x = 0.054

At equilibrium

[COCl₂] = (0.280 - x) = 0.280 - 0.054 = 0.226 M

[CO] = 0.054 M

[Cl₂] = 0.054 M

Answer:

The correct answer is D. Ask a question that can be answered by making observations.

Explanation:

Basically, in order to develop a testable hypothesis, scientists must adhere to the guidelines of the scientific method.

The scientific method is usually understood to be a so-called hypothetical-deductive method, the core of which is to make hypotheses based on observations or measurements, to make predictions based on them and to check the validity of predictions by repeated experiments. More generally, the scientific method is a general way of obtaining solid knowledge, using many means of proof, both empirical and theoretical, to achieve certainty. The scientific method is a widely recognized tool in the scientific community for seeking objectivity, reliability and transparency in research.

Answer:

Wood absorbs solar radiation to make chemical energy.

The chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.

The wood has been the source of energy by the burning for a long duration. The chemical energy has been stored in the dry wood has been converted to light and heat energy on burning.

The energy stored in the wood has been comprised by photosynthesis, where the solar energy has been entrapped in the wood and is converted to chemical energy that is stored.

Thus, the chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.

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Answer:

The solute is the substance that is being dissolved,

Explanation:

A solution is a homogeneous mixture consisting of a solute dissolved into a solvent .

Answer:

solutes

Things which dissolve are called solutes and the liquid in which they dissolve is called a solvent to form a solution. Strongly polar substances easily attract water molecules. The water molecules surround the charged solute.

Explanation:

Took the same test and that was the one that was right hope this helps you

Answer:

The segment of this graph that shows a decreasing velocity is the EF segment. AB and DE segments show that whatever was moving, in these segments was stopped. The segment BC shows an increase in velocity - the metres travelled were always more as the time went by.

Explanation:

Answer:

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)

Answer:

100M

Explanation:

Answer:

wheres the image

Explanation:

Answer:

0.16 M.

Explanation:

Hello!

In this case, since the reaction can be determined as zeroth-order because of the units of M/s, we can write the rate law as:

[tex][X]=[X]_0-kt[/tex]

In such a way, since we need the initial concentration of X, we proceed as follows:

[tex][X]_0=[X]+kt[/tex]

So we plug in to obtain:

[tex][X]_0=0.096M+3.6x10^{-5}\frac{M}{s}*30.min*\frac{60s}{1min}[/tex]

[tex][X]_0=0.16M[/tex]

Best regards!

Answer:

BBBBBBBB ITS B

Explanation:

Explanation: nad   .......

Sodium is not use, as a metal catalyst for the hydrogenation of an alkene. Therefore, option C is correct.

Hydrogenation is the chemical reaction that occurs when molecular hydrogen reacts with another compound or element, typically in the presence of a catalyst such as nickel, palladium, or platinum. Organic compounds are commonly reduced or saturated using this method.

A hydrogenation reaction is an example of an alkene addition reaction. Two hydrogen atoms are added across the double bond of an alkene in a hydrogenation reaction, resulting in a saturated alkane.

To activate the chemical reaction between hydrogen and another compound, hydrogenation catalysts, typically made of iridium, nickel, palladium, platinum, rhodium, or ruthenium, are used.

Therefore, option C is correct.

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Answer: The oxidation state of a free element (uncombined element) is zero. For a simple (monoatomic) ion, the oxidation state is equal to the net charge on the ion. For example, Cl– has an oxidation state of -1. When present in most compounds, hydrogen has an oxidation state of +1 and oxygen an oxidation state of −2.

Hope this helps...... Stay safe and have a Merry Christmas!!!!!!!!!!! :D

Explanation:

Mass is the multiplication product of moles and the molar mass of the substance. The mass of aluminum chloride in the reaction is 48.95g.

Grams are the unit of the measurement of the substance used to calculate the weight of the substance in a compound or molecule.

The balanced chemical reaction is  given as:

[tex]\rm 2Al (s) + 3Cl_{2} (g) \rightarrow 2AlCl_{3} (s)[/tex]

Given,

Mass of aluminium = 34.0 gm

Mass of chlorine gas = 39.0 gm

The moles of aluminum is calculated as:

[tex]\dfrac{34}{27} = 1.26[/tex]

The moles of chlorine gas are calculated as:

[tex]\dfrac{39}{2 \times 35.5} = 0.55[/tex]

From the moles, it can be seen that aluminum is in excess so further calculations will be done based on the moles of chlorine gas.

Moles of aluminum chloride are calculated as:

[tex]\dfrac{0.5500 \;\rm mol \; Cl_{2} \times 2 \;\rm mol \; AlCl_{3}}{3 \;\rm mol \; Cl_{2}} = 0.3667 \;\rm mol \;\rm AlCl_{3}[/tex]

Moles of aluminum chloride are 0.3667 and the molar mass is 133.341 g/mol. The mass is calculated as:

[tex]0.3667 \times 133.341 = 48.8961[/tex]

Therefore, 48.95 gm is the mass of aluminum chloride.

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Answer:

Three hydrogen atoms to form PH₃.

Explanation:

Hello!

In this case, since the elements belonging to the nitrogen family (N, P, As, Sb and Bi) show five valence electrons, because there are five electrons at their outer shell, it is clear that if phosphorous bonds with hydrogen, it is going to require the same amount of oxygen atoms (3) because elements having five valence electrons need 3 bonds in order to attain the octet (5+3=8).

Therefore the compound would be:

[tex]PH_3[/tex]

Which is phosphine.

Best regards!

Answer:

yes

Explanation: