URGENT PLEASe HELP



Balance the following chemical equations. (please) Also, please explain each one briefly so I understand. Thanks in advance! (unless the answer is useless) I don't know if any of these make sense I'm just writing what I see on the paper.)


___CH4 + __O2 -----> ____ CO2 + ____H2O


____AgI + ____Na2S ------> ____Ag2S + ____NaI


____NH3 + ____O2 ------> _____NO + _____H2O


_____SiO2 + ___HF ----> ______SiF4 + ____H2O

Answer:

Cell division is central to organism growth, reproduction and tissue repair.

Explanation:

Hope this helps!

Answer:

multiply, survive grow

Therefore, the number of d electrons in the valence shell of the Ru cation is 6, and the number of unpaired electron spins is 5.

The Ru cation has a configuration of [Kr]4d⁶, meaning that there are 6 d electrons present in the valence shell. To determine the number of unpaired spins, we need to apply Hund's rule, which states that electrons will occupy separate orbitals in a subshell before pairing up. In this case, since there are 6 d electrons, they will first occupy the five 4d orbitals singly, with one of them having two electrons. This results in 5 unpaired electron spins, which can be observed in magnetic measurements.  We can also mention the importance of these concepts in understanding the chemical and physical properties of transition metals, such as their reactivity, magnetic behavior, and catalytic activity.

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Answer:

I imagine the answer would be Charles Darwin's theory of natural selection.

Explanation:

Natural selection explains that some organisms, like animals, possess inheritable traits that allow them to better survive within and adapt to their environment, compared to other organisms. That species will be able to outlive those without the trait(s) as they have more opportunities to reproduce and pass their inherited genes onto the next generation. This is why "natural selection" most fits within question number 3's blank space.

Answer:

Brainliest Please !!!!!

Answer:

hit me up

Explanation:

The question is incomplete, the complete question is;

Balance the following equations by inserting the proper coefficients.

CH4 + O2 ---------------> CO2 +H2O

CaCl2 + AgNO3 ----->Ca(NO3)2 +AgCl

C2H6O + O2----------->CO2 +H2O

Answer:

CH4 + 2O2 ---------------> CO2 +2H2O

2AgNO3 + CaCl2 → Ca(NO3)2 + 2AgCl

C2H6O + 3O2 → 2CO2 + 3H2O

Explanation:

You see, when we set out to balance chemical reaction equations, ultimately, our aim is to ensure that the number of atoms of each element on the reactant side is exactly the same as the number of atoms of the same element on the products side.

We do this by counting the number of atoms required to have a balanced reaction equation and then adding coefficients in order to have a balanced chemical reaction equation.

This is what have been done in balancing the three reaction equations shown in the answer section.

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

They both combine with The help of valency, which is the combining capacity of elements

Explanation:

I find it easier to understand valency as part of the Bhor’s model of an atom.

In his model, it was stated that electrons are spread around the nucleus in such a way that there are rings around the model. Each ring has a n value. So, k has 1, l has 2, m has 3 and n has 4...

what you need to know to find the number of electrons in each ring is to solve the formula 2n squared

Then, the valency is the 8 minus the number of electrons in the outermost shell. Remember that 8 is max number I;outer most shell. If you try it out for oxygen, you will get the value of 2 remaining, which can be gained if combined with calcium.

Hope it helps

Answer:

78.003558

Explanation:

By doing scientific experiment we can prove inference about the acidity of the paper is true.

The experiment is nothing but to do the test of the hypothesis and are the main foundation of the scientific method, the steps include Make an observations, form hypothesis, conduct experiment, evaluation of result.

Then accept or reject the hypothesis from the evaluated result, if rejected make new hypothesis; Another important factor is variable which is compulsorily added to the experiment.

Three major types of variables included like dependent, independent and controlled variables.

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37.5 moles of iron will produce 2990.31 grams of Fe₂O₃.

To determine the number of grams of Fe₂O₃ produced from 37.5 moles of iron (Fe), we need to use the balanced chemical equation for the reaction in which iron reacts to form Fe₂O₃.

The balanced equation for the reaction is:

4Fe + 3O₂ -> 2Fe₂O₃

From the balanced equation, we can see that 4 moles of iron react to produce 2 moles of Fe₂O₃. This means that the molar ratio between Fe and Fe₂O₃ is 4:2 or 2:1.

Now, we can set up a simple proportion to calculate the number of moles of Fe₂O₃ produced:

(37.5 moles Fe) * (2 moles Fe₂O₃ / 4 moles Fe) = 18.75 moles Fe2O3

So, 37.5 moles of iron will produce 18.75 moles of Fe₂O₃.

To convert moles to grams, we need to use the molar mass of Fe₂O₃. The molar mass of Fe₂O₃ can be calculated by adding the atomic masses of iron (Fe) and oxygen (O) in the compound:

(2 x atomic mass of Fe) + (3 x atomic mass of O) = (2 x 55.845 g/mol) + (3 x 16.00 g/mol) = 159.69 g/mol

Now, we can calculate the mass of Fe₂O₃ produced:

Mass = moles x molar mass

Mass = 18.75 moles x 159.69 g/mol = 2990.31 grams

Therefore, 37.5 moles of iron will produce 2990.31 grams of Fe₂O₃.

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Answer: D

Explanation:

S + 2 O2 –> SO4

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Answer:

Chemical formula

Explanation:

because chemical formulas use chemical elements , symbols , and numbers to present information about the chemical proportions.

Answer:

ionic

Explanation:

Option (b) is correct. Amides are the derivative of amines and carboxylic acids.

Amides are the derivatives of carboxylic acid and amines. A carboxylic acid contains the  −COOH  functional group, and in an amide the  −OH  part of that group is replaced by an  −NH2  group. So, amides contain the  −CONH2  group. Any member of either of two classes of nitrogen-containing compounds related to ammonia and amines. The covalent amides are neutral or very weakly acidic substances formed by replacement of the hydroxyl group (OH) of an acid by an amino group NR2, in which R may represent a hydrogen atom or an organic combining group such as methyl, CH3. Among the amides of commercial importance are acetamide and dimethylformamide HCON(CH3)2, which are used as solvents, the sulfa drugs, and the nylons.

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When an element has a cation of +2, it has lost two electrons. A solution is a choice (E).

In electrolysis, the cathode would be drawn to a positively charged ion called a cation. In order for a cation to develop, one or more electrons must be lost, usually by the action of atoms with a larger affinity for them.

Following the chemical symbol is a number indicating the number of electrons lost and consequently the charge of the ion. For example, silver (Ag) loses one electron to become Ag+ while zinc (Zn) loses two electrons to become Zn2+.

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The number of ounces of the 17% copper alloy needed is approximately 66 ounces (D).

To solve this problem, we'll set up a system of equations to represent the given information.

Let x be the number of ounces of the 17% copper alloy.

Let y be the number of ounces of the 25% copper alloy.

We know that the total weight of the two alloys combined is 138 ounces, so we have the equation:

x + y = 138 (Equation 1)

We also know that the desired alloy should have a copper content of 21.174%, so we have the equation:

(0.17x + 0.25y) / 138 = 0.21174 (Equation 2)

To solve this system of equations, we can use the substitution method.

From Equation 1, we can solve for x:

x = 138 - y

Substituting this value of x into Equation 2, we have:

(0.17(138 - y) + 0.25y) / 138 = 0.21174

Simplifying the equation:

23.46 - 0.17y + 0.25y = 29.21212

Combining like terms:

0.08y = 5.75212

Dividing both sides by 0.08:

y = 71.9

Rounding to the nearest whole number, y ≈ 72 ounces.

Substituting this value of y back into Equation 1, we can solve for x:

x = 138 - y

x = 138 - 72

x = 66

Therefore, the number of ounces of the 17% copper alloy needed is approximately 66 ounces (D).

To form 138 ounces of an alloy that is 21.174% copper, Arne and Nancy need to mix approximately 66 ounces of an alloy that is 17% copper with approximately 72 ounces of an alloy that is 25% copper.

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Biotic factors are living components of an ecosystem that directly or indirectly affect the survival and behavior of organisms.

These factors include plants, animals, fungi, bacteria, and other microorganisms. Biotic interactions can have a profound impact on the population dynamics, species diversity, and overall functioning of an ecosystem.

Biotic factors play a crucial role in shaping the structure of ecosytems. For example, the presence of predators can control the populatsion size of prey species, leading to a balance in the ecosystem. Similarly, the interactions between pollinators and flowering plants are essential for the reproduction and survival of both parties.

Biotic factors can also influence the distribution and adaptations of organisms. For instance, certain plants may have specific symbiotic relationships with bacteria or fungi in their roots, aiding in nutrient absorption. Competition for resources, such as food, water, and shelter, among different species can also shape their distribution patterns.

Overall, biotic factors are integral to the functioning and sustainability of ecosystems. They interact with abiotic factors to create a complex web of relationships that determine the survival, growth, and evolution of organisms within their environments

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From the stoichiometry of the reaction, the final molarity of Cr2O7^2- in the solution is 0.044 M.

1) The balanced reaction equation is;

4Cr^3+(aq) + 14HClO(aq) + 14H^+(aq) -----> 28H^+(aq) + 7Cl2(g) + 2Cr2O7^2-(aq)

2) The oxidation number of chromium in Cr2O7^2- is obtained as follows;

2x + 7(-2) = -2

2x - 14 = -2

2x = -2 + 14

2x = 12

x = 6

3) This is an oxidation - reduction reaction because the oxidation number of Cr increased from + 3 to +6.

4) This is because, the reaction produces hydrogen ions causing the pH to decrease.

5) Nitrate does not appear in the balanced reaction equation hence it is a spectator ion.

6) Number of moles of chromium nitrate = 26.5/1000 L × 0.120 M = 0.00318 moles

Since 4 moles of Cr^3+ reacts with 14 moles of hypochlorous acid

0.00318 moles of  Cr^3+ reacts with  0.00318 moles × 14 moles/4 moles =

0.0011 moles

Molarity of hypochlorous acid = 0.0011 moles/0.01 L = 0.11 M

7) If  4 moles of Cr^3+  yields 2 moles of  Cr207^2-

0.00318 moles of  Cr^3+ yields  0.00318 moles ×  2 moles / 4 moles

= 0.00159 moles

Final molarity of   Cr207^2- =  0.00159 moles/(10 mL + 26.5 mL) × 10^-3

= 0.044 M.

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The range of the of the oxidation number of the first transition series is +2 to +6.

Transition elements or transition metals are elements or metals that have partially filled d orbitals.

The first main transition series begins with either;

Thus, the range of the of the oxidation number of the first transition series is +2 to +6.

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The enthalpy of reaction (ΔH) of the above chemical reaction is equal to -143 kJ/mol.

A chemical reaction can be defined as a chemical process that involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.

A balanced chemical equation can be defined as a chemical equation wherein the number of atoms on the reactant (left) side is equal to the number of atoms on the product (right) side.

Next, we would write the properly balanced chemical equation for this chemical reaction:

                                    3/2O₂ -----> 2/2O₃

Therefore, the enthalpy of reaction (ΔH) of the above chemical reaction is half the enthalpy of reaction (ΔH) of the initial chemical reaction:

Enthalpy of reaction (ΔH) = ½ × -286 kJ/mol

Enthalpy of reaction (ΔH) = -143 kJ/mol.

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Answer:

The concept map that shows the conversion factors needed to convert between mass, moles, and number of particles is called a mole road map. It is a simple guide for converting between units of mass, volume, and number of particles. Each set of units must be converted to moles first.

The atomic structure of the atoms would be ions with the positively charged ion having one extra electron and the negatively charged ion having one fewer electron.

Both atoms have 6 protons each. The first atom has a positive charge while the second atom has a negative charge.

In other words, the first atom has lost an electron in order to have a positive charge. Similarly, the second atom has gained an electron in order to have a negative charge.

This means that the atom with a positive charge originally has one extra electron while the one with a negative charge originally has one fewer electron.

For the two atoms, the protons and neutrons are located in the nucleus while the electrons are found outside the nucleus around the orbitals.

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Answer:

1174.392 mph

Explanation:

.....................

The volume of \(KMnO_{4}\) having molarity 0.122M is equal to 12.3ml.

we know that \(M_{1} V_{1} =M_{2} V_{2}\).

Given that, \(M_{1}\)= molarity of oxalic acid=?.

\(M_{2}\)= molarity of NaOH= 0.149M.

\(V_{1}\)= volume of oxalic acid= 15ml.

\(V_{2}\)= volume of NaOH= 25.2 ml.

Therefore, \(M_{1} = \frac{M_{2V_{2} } }{v_{1} }\)= \(\frac{0.149*25.2}{15} = 0.2503M\).

Potassium permanganate, is widely used as an oxidising agent in volumetric analysis. In acidic solution, permanganate ion undergoes a 5 electrons reduction to manganese (2) ion:-

\(8H^{+} + MnO_{4} ^{-} + 5e^{-}\)⇒\(Mn^{2+} + 4H_{2} O\).

The oxalate ion, derived from the weak oxalic acid, may undergo a 2 electrons oxidation:-

\(C_{2} O_{4} ^{2-}\)⇒\(2CO_{2} + 2e^{-}\)

The balanced net ionic equation for the reaction of permanganate ion with oxalate ion is as follows:-

\(16H^{+} + 2MnO_{4} ^{-} + 5 C_{2} O_{4} ^{-}\)⇒\(10CO_{2} +2Mn^{2+} + 8H_{2} O.\)

From the above reaction, it tells 2 moles of potassium permanganate are neutralizing 5 moles of oxalic acid.

Therefore, one mole of oxalic acid= \(\frac{5}{2}\)moles of potassium permanganate.

So, molarity of \(KMnO_{4}\)= \(\frac{5}{2} * 0.122= 0.305M.\)

Again we involve above reaction, \(M_{2} V_{2} = M_{3} V_{3}\)= \(0.2503* 15= 0.305*V_{3}\).

\(V_{3} = 12.3ml.\)

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The complete balanced chemical reaction can be written from the half reaction in acidic solution is,

           NO3- + 4H+ + 3e ----> NO + 2H2O.

The half reaction is the part of reaction which represents either an oxidation or a reduction. There are two half-reactions. one is oxidation and other is reduction. Both are necessary to completely describe a redox reaction.

NO3- ----> NO.

This reaction is not balanced and not completed.

NO3- + 4H+ + 3e----> NO + 2H2O.

This is a balanced chemical reaction. A balanced equation contains the same number of each type of atoms on both the left and right sides of the reaction arrow. To write a balanced equation, the reactants go on the left side of the arrow, while the products go on the right side of the arrow.

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47.1 ml of acetone has a mass of 37.2 g when the density is 0.7899 g/ml.

As stated in the question,

the density of acetone = 0.7899 g/ml

as we know, the mass of a substance per unit of volume is its density which means 0.7899 g ( mass) is present in 1 ml (volume). Hence, by the unitary method:

0.7899 g -> 1ml

1g-> 1/0.7899 ml

37.2 g -> 37.2/0.7899 ml = 47.1 ml

47.1 ml of acetone has a mass of 37.2 g.

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When the final electron acceptor is an organic molecule the process to make ATP molecules is termed fermentation.

The fermentation pathway is an anaerobic series of chemical reactions by which the cell can generate ATP (the energy coin of all types of cells) in order to perform metabolic activities such as cell differentiation and cell reproduction. During this process, pyruvate molecule is used as the final electron acceptor.

Therefore, we can conclude that the fermentation pathway uses pyruvic acid or pyruvate as the final acceptor, which is an organic molecule.

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