Please help, How would you define what a chemical reaction and an equation is? Give an example.How would you know if a chemical reaction is balanced? Give an example.

Looking for evidence entails careful study. The answers to the question is below;

The crime that Mr. Fraser describes is drive-by killing.

The police select their suspect by the act of showing pictures to one of the teenagers and thereafter they the suspect out, the suspect the saw that shoot the father.

The fact was that there was no evidence since they did not find the gun and the car used in the crime was not identified. Even the suspect vehicle (shooter) was not identified also.

The approximate figure is about 252 out of 367 cases of wrongful conviction have been identified. That is 69% of DNA exonerations. Others about 250-285 cases.

The National Registry of Exonerations has stated that about 450 non-DNA-based exonerations  where there was eyewitness misidentification. That is about 3 quarters have eye witness testimonies.

Reconstructive memory is simply known as the act of remembering that involves the reproduction of an experience or event that is known to be partially stored in memory before.

Fraser challenged the judge to go out and inspect the crime scene themselves.

The outcome of the challenge was that the judge thereby granted the retrial for Francisco Carrillo and thus released him so he can prepare his defense before the prosecution day.

Mr. Fraser suggested that people learn to be more effective with how they handle things or situations so as to get the right evidence and also that people be more cautious about how true some eyewitness testimonies may be.

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Answer:

Precise, but not accurate

Explanation:

First, let’s define accuracy and precision.

⇒Accuracy: how close you are to the actual value

⇒Precision: how close the measurements are to each other.

Let’s examine the data given:  

12.13 g, 12.12 g, 12.13 g, and 12.11 g

Each number is or is very close to 12.12 (within 0.1)

The actual mass of the object is 17.13 grams. Each measurement is about 5 grams away from the actual mass.

Since the measurements are very close to each other, but quite far from the true value, we can say the results are precise, but not accurate.

Answer:

Explanation:

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these are the examples of homogeneous mixture

Answer:

H - Cl2 +NaBr -> Br2+2NaCl

Phosphate is any salt or ester of phosphoric acid with the chemical formula PO₄³-

According to this question, a chemical compound with the formula; FePO₄ was given. The iron ion has a 3+ charge and the phosphate ion has a 3- charge.

Charge of an ion can be estimated by finding the difference between the number of protons and electrons in the atom.

Phosphate is an ion with charge of -3, hence, it complements an iron ion with charge +3 to form a neutral compound.

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Answer:

Depends on what are you refering to

Explanation:

So depending on what you are looking for (your question is quite vauge)

there are 5 atoms of the comopound (K2CO3)

within that compound, there are 2 atoms of Potassium and 1 atom of Carbonate. Within Carbonate there are 4 atoms (1 carbon and 3 oxygens)

so answers may be

5, 15, or 25.

I hope this helps.

Answer:

Explanation:

2 H₂(g) + O₂(g) → 2 H₂O(g

2 moles     1 mole      2 mole

50 g of H₂ = 50 /2 = 25 moles of H₂

100 g of O₂ = 100 / 32 = 3.125 moles of O₂

So oxygen is the limiting reagent .

3.125 moles of O₂ will react with 6.25 moles of H₂ to give 6.25 moles of H₂O .

Hence moles of H₂O produced = 6.25 moles .

The frequency of a photon is 8.333 x 10^14 s^-1 .

The frequency of a photon is defined as the number of waves that pass through a fixed point in a unit of time.

Formula :

f = c/ λ ---------- (1)

Where f is the frequency, c is the speed of light, and λ is the wavelength of the photon

According to question,

Given,

The wavelength of photon = 360 nm or 3.60 × 10^-7

3 x 10^8 m/s is the speed of light.

We have to find the frequency of a given photon.

Using eq. (1),

f = 3 × 10^8/ 3.60 × 10^-7

f = 0.8333 × 10^15 s^-1

Or we can also write that,

f= 8.333 x 10^14 s^-1

Hence, the frequency of the photon is 8.333 × 10^14 s^-1.

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ANSWER

The number of moles of NaOH is 432 moles

EXPLANATION

Given information

The number of moles of As = 144 moles

Let x represents the number of moles of NaOH

From the above reaction, you will see that 2 moles of As react with 6 moles of NaOH

The next step is to find the number of moles of NaOH using a stoichiometry ratio

Hence, the number of moles of NaOH is 432 moles

B) 2.72 * 10^13 oxygen atoms are there in phosphoric acid.

The most significant phosphorus oxygen acid, also known as orthophosphoric acid (H3PO4), is used to create phosphate salts for fertilizers. Additionally, it is utilized in the production of albumin derivatives, dental cement, sugar, and textile manufacturing. It is used in food goods as an acidic, fruity flavoring.

A less concentrated version of phosphoric acid is a colorless syrupy liquid, while pure phosphoric acid is a crystalline solid with a melting point of 42.35° C (or 108.2° F). While white phosphorus is used to create acid with a higher purity, phosphate rock is used to create crude acid. Three classes of salts are produced by phosphoric acid depending on whether one, two, or three hydrogen atoms are substituted.

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The rate of reaction in SN2 reaction becomes four times when the the concentration of bromoethane is doubled and the concentration of hydroxide ion doubles.

In SN2 reaction, the rate of reaction is depend on the concentration of both reactant.

For SN2 reaction,

r = k[bromoethane] [hydroxide ion]

r = k [CH3CH2Br] [OH]

When the concentration of bromoethane is doubled and the concentration of hydroxide ion doubles then,

r = k 2×[CH3CH2Br] × 2[OH]

r = 4k[CH3CH2Br] [OH]

Thus, we concluded that the rate of reaction in SN2 reaction becomes four times.

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The superscript 3 in 4pº tell that there are 3 electrons in this orbital

In an atom there are levels of energy in the shell and sub shell

This energy level is expressed in the form of electron configurations.  

There are 4 sub-shells in the shell of an atom, namely s, p, d, and f. The maximum number of electrons for each sub-shell is  

• s: 2 electrons  

• p: 6 electrons  

• d: 10 electrons and  

• f: 14 electrons  

Charging electrons in the sub-shell uses the following sequence:  

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.  

Arsenic is an element with the symbol As, which has an atomic number of 33 and a mass number of 75

Electron configuration of As : [Ar] 3d¹⁰4s²4p³

Each superscript shows the number of electrons that occupy each orbital

For the p orbital there are a maximum of 6 electrons, while the 4p³ orbital shows that there are 3 electrons in this orbital

Answer:

the answer is C

''number of atoms in each compound in a  reaction.''

Explanation:

its a fact

The coefficients in the chemical equation represent relative numbers of moles of reactants and products. Therefore, option B is correct.

A chemical equation can be explained as the representation of a chemical reaction in terms of chemical symbols. A chemical equation exhibits reactants participating, formed products in the reaction, and an arrow representing the direction of the chemical reaction.

The chemical equation in which the number of atoms of each element is equal on both sides of the chemical equation is known as a balanced chemical equation.

The law of conservation of matter needed to be followed while balancing a chemical equation.

The total mass of all elements on the reactant side should be equal to the total mass of all elements on the product side in a balanced chemical equation. The coefficients represent a number of moles of reactants and products.

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Answer:

3fe s )+ 4h2o G )= fe3o4 s )+ 4h2 G

Explanation: 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) (i) Iron metal is getting oxidised. (ii) Water is getting reduced. (iii) Water is acting as reducing agent.

Explanation:

i make a search

Answer

1.50 mol

Explanation

Given:

Initial volume, V₁ = 25.0 L

Mass of CH4 gas in 25.0 L container = 40 g

Final volume, V₂ = 15.0 L

From the Periodic Table; molar mass of CH4 = 16.04 g/mol

What to find:

The new amount in mole.

Step-by-step solution:

According to Avogadro’s law: For a confined gas, the volume (V) and number of moles (n) are directly proportional if the pressure and temperature both remain constant. That is:

n₁ = Mass/Molar mass = (40.0g/16.04 g/mol) = 2.493765586 mol

n₂ is the new amount in mole and can be calculated as follows:

The new amount in moles is 1.50 moles

Answer:

Protons = 11  Electrons = 10  Neutrons = 12

Explanation:

Sodium's atomic number is 11. The atomic number is determined by the number of protons in an atom. Since protons have a charge of +1 you would need 1 less electron than proton. Finally, to find the number of neutrons, you subtract the atomic number FROM the atomic mass. The atomic mass of Na23 is 23. Subtract 11 from 23 and you get 12.

The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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The statement " nutrition is the acquisition of chemical substances by organisms for use as an energy source or as building blocks of cellular structures" is true.

Nutrition is indeed the acquisition of chemical substances by organisms for use as an energy source or as building blocks of cellular structures. Organisms require various nutrients, including carbohydrates, proteins, fats, vitamins, minerals, and water, to carry out their metabolic processes, maintain growth and development, and support overall health and well-being.

These chemical substances obtained through nutrition are utilized by organisms to provide energy for cellular processes, such as respiration, synthesis of biomolecules, and movement. They also serve as building blocks for the construction and repair of cellular structures, including proteins, nucleic acids, lipids, and carbohydrates.

Nutrition is a fundamental process that ensures the availability of essential nutrients for organisms to carry out their life functions effectively. Different organisms have varied nutritional requirements depending on their specific metabolic needs, lifestyles, and physiological characteristics.

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To prepare a buffer solution with a pH of 5.59, 190.56ml of 0.1M NaOH should be added to 24.0ml of 0.1M Hb.

First, we can use the formula

ph = pka + log([base]/[acid])

to find the ratio of base to acid needed in the buffer. We know that the desired pH is 5.59 and the pKa of the acid (HB) is 4.54.

so,

5.59 = 4.54 + log(x)

where x is the ratio of base to acid

then we can solve for x,

x = \(10^{(5.59-4.54)\)

x = \(10^{(1.05)\)

x = 7.94

Now we know that we need 7.94 times more base than acid in the buffer solution. Since we have 0.1M of Hb and want to add 0.1M of NaOH, we can convert that ratio to volumes using the fact that the initial volume of Hb is 24.0 ml. So,

24.0ml x 7.94 = 190.56ml

So, we would need to add 190.56ml of 0.1M NaOH to 24.0ml of 0.1M Hb to prepare a buffer with a pH of 5.59.

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Answer:

C. It helps a plant conserve energy.

Explanation:

Dormancy is a time in a plants life that it stops all physical growth, therefore conserving energy.

Hope this helps.

Explanation:

A balanced chemical equation is one where all the individual atoms are equal on both sides of the reaction. It follows the law of conservation of mass.

When potassium phosphate reacts with silver nitrate, it leads to the formation of silver phosphate and potassium nitrate.

The balanced chemical equation follows:

\(3AgNO_3+K_3PO_4\rightarrow Ag_3PO_4+3KNO_3\)

When barium bicarbonate reacts with calcium hydroxide, it leads to the formation of barium carbonate, calcium carbonate and water

The balanced chemical equation follows:

\(Ba(HCO_3)_2+Ca(OH)_2\rightarrow BaCO_3+CaCO_3+2H_2O\)

Using MO theory, we predict that 1 and 3 (CN and CN2) are diamagnetic, while 2 (CN+) is paramagnetic. Therefore, the correct answer is a. 1 and 3 only.

Using MO theory, we can predict the magnetic properties of molecules based on the electron configuration of their molecular orbitals. Diamagnetic species have all of their electrons paired, while paramagnetic species have unpaired electrons.
For CN, we can draw the MO diagram by combining the atomic orbitals of carbon and nitrogen. The diagram shows that CN has 10 electrons in its molecular orbitals, with all of them paired. Therefore, CN is diamagnetic.
For CN+, we can remove one electron from CN and recalculate the MO diagram. The resulting diagram shows that CN+ has 9 electrons, with one unpaired electron in the highest energy molecular orbital. Therefore, CN+ is paramagnetic.
For CN2, we can combine two CN molecules and draw the MO diagram. The diagram shows that CN2 has 20 electrons in its molecular orbitals, with all of them paired. Therefore, CN2 is also diamagnetic.

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CLOUDS would be one of the interacting parts in a weather system.

Taking into account the reaction stoichiometry, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.

In first place, the balanced reaction is:

CaO + H₂O → Ca(OH)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 following rule of three can be applied: If by stoichiometric reaction 1 mole of Ca(OH)₂ is produced by 1 mole of CaO, 2 moles of Ca(OH)₂ are produced by how many moles of CaO?

\(moles of CaO=\frac{2 moles of Ca(OH)_{2}x1 mol of CaO }{1 mole of Ca(OH)_{2}}\)

moles of CaO= 2 moles

Finally, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.

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1.78 grams of silver can be produced from 1.40 g silver nitrate and excess copper. The balanced chemical equation for the reaction of copper with silver nitrate (use cu2) is as follows: Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

To determine how many grams of silver can be produced from 1.40 g of silver nitrate and excess copper, we first need to calculate the limiting reactant.

The stoichiometry of the reaction is such that 2 moles of silver nitrate react with 1 mole of copper to produce 2 moles of silver. The molar mass of silver nitrate is 169.87 g/mol while that of copper is 63.55 g/mol,

therefore, the number of moles of silver nitrate present in 1.40 g can be calculated as follows:Number of moles of silver nitrate = mass/molar mass= 1.40/169.87= 0.008240 molSimilarly, the number of moles of copper required to react with this quantity of silver nitrate is 0.004120 mol (half of the number of moles of silver nitrate).

Since there is an excess of copper, it will not limit the reaction and hence the limiting reactant is silver nitrate.To calculate the mass of silver produced, we use the molar mass of silver, which is 107.87 g/mol.Mass of silver produced = number of moles of silver x molar mass= 0.01648 x 107.87= 1.78 g

Therefore, 1.78 grams of silver can be produced from 1.40 g silver nitrate and excess copper.

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Answer:

1. 2.80g Pb +2

2. 3.34g PbF2

Explanation:

The molar mass of lead (Pb) is approximately 207.2 g/mol.

The molar mass of fluorine (F) is approximately 19.0 g/mol.

To calculate the molar mass of PbF2, we add the atomic masses of lead and two fluorine atoms:

Molar mass of PbF2 = (207.2 g/mol) + 2 * (19.0 g/mol) = 245.2 g/mol

The mol ratio of PbF2 is:

for every 1 pb +2, there are 2 F -

1 Pb : 2 F

1. How many grams of lead(II) are present in 3.31 grams of lead(II) fluoride, PbF2?

To determine the amount of lead in 3.31 grams of PbF2, we need to calculate the mass ratio between lead and lead(II) fluoride.

(207.2 g Pb / 245.2 g PbF2) * 3.31 g PbF2 = 2.80 grams of lead (II).

2. How many grams of lead(II) fluoride can be made from 2.82 grams of lead(II)?

To determine the amount of lead(II) fluoride that can be made from 2.82 grams of lead, we use the mass ratio between lead and lead(II) fluoride.

(245.2 g PbF2 / 207.2 g Pb) * 2.82 g Pb = 3.34 grams of lead(II) fluoride.

In the Photo below, you can see how I used a Ratio and the train track method to get and defend my answers.

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Using the reaction profile that we can see from the question that has been given, the overall energy change is -250 kJ/mol

Enthalpy of reaction is the amount of heat absorbed or released during a chemical reaction, at a constant pressure. It is a measure of the energy change that occurs when reactants are transformed into products in a chemical reaction.

Enthalpy of reaction is denoted as ΔHrxn, where ΔH is the symbol for the change in enthalpy, and rxn is the abbreviation for "reaction". It is expressed in units of energy per amount of substance, such as joules per mole (J/mol).

Using;

Energy of Products - Energy of reactants

100 - 350 = -250 kJ/mol

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The average atomic mass of uranium is 237.97 amu based on its three common isotopes.

Isotopes are the different forms of the same element. In considering the abundance of different isotopes of uranium for the calculation of its average atomic mass, the formula below is used.

Average atomic mass = summation of [(percent abundance /100)*atomic mass]

With the given three common isotopes of uranium, the calculated value of average atomic mass is shown below.

Average atomic mass= (0.01/100)(234 amu) + (0.71/100)(235 amu) + (99.28/100)(238 amu)

Average atomic mass=237.97 amu

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