Write and balance a net ionic equation for the reaction between iron(ii) chloride and potassium hydroxide to form iron(ii) hydroxide and potassium chloride.

Answer : The correct answer is oxidation number of Zn changes from 0 to +2.

Oxidation number :

It is number given to an element when it undergoes oxidation by loosing electrons . Oxidation number is equal to number of electrons donated . It is generally represented as charge .

Oxidation number of any element in a compound can be calculated as :

(Total number of positive charge) + (total number of negative charge) = total charge on compound

Where : Total positive charge = No. of atom or polyatomic molecule * positive charge on it

Total negative charge = No. of atom or polyatomic molecule * negative charge on it

Total charge on compound = Charge lying on top of compound .

Following steps can be used to find change in oxidation number of Zn :

Step 1 ) : To find oxidation number of Zn ( reactant side ) :

On reactant side Zn is present in solid state or its elemental state . It is not attached to any other atom , hence it is neutral and isolated atom. So oxidation number on Zn(s) is 0 .

Step 2: To find oxidation number of Zn in ZnSO₄ (aq)

ZnSO₄(aq) is ionic compound compound . It has two ions in it, Zn and SO₄ . Also it is a neutral compound means it has zero charge on it .

SO₄ is sulfate which has -2 charge or oxidation number on it (image attached )and there is one molecule of SO₄ ion . There is one atom of Zn which has unknown charge or oxidation number (x) .

To calculate oxidation number on Zn ion , plug values in above formula :

(No of Zn atom * charge on it ) + (No of SO₄ molecule * charge on it ) = Total charge on ZnSO₄

( 1* charge on Zn ) + ( 1* -2 ) = 0

Charge on Zn + (-2) = 0

Charge on Zn = +2

On reactant side Zn(s) has Zero charge and on product side Zn in ZnSO₄(aq) has +2 charge .

Hence the charge in oxidation number of Zn is from 0 to +2 .

the molecular egometry around each carbon atom in a staurated hydro carbon is tetrahydral

The total charge of the thorium nucleus is 1.44 ×  10⁻¹⁷ C.The net electric charge on an ion is similar to the number of protons in the ion less the number of electrons.

The net electric charge on an ion is equal to the number of protons in the ion less the number of electrons. The electric charge on a proton is equal in magnitude to the charge on an electron.

When an atom has an equal amount of protons and electrons, it also has an equal number of positive and negative electric charges (the protons). The atom is referred to as neutral since its overall electric charge is zero.

Total Charge of Thorium Nucleus

= 90 × Charge of 1 electron

Q = 90 × 1.6 × 10⁻¹⁹ C

Q = 1.44 ×  10⁻¹⁷ C

Thus,  1.44 ×  10⁻¹⁷ C is the total charge of the thorium nucleus is 1.44 ×  10⁻¹⁷ C.

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The ability to attract an electron for bonding is called Electronegativity. Hence, option C is correct.

An atom consists of a central nucleus that is usually surrounded by one or more electrons.

Electronegativity is a measure of an atom's ability to attract shared electrons to itself.

The more strongly an atom attracts the electrons in its bonds, the larger its electronegativity.

Hence, option C is correct.

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Final answer:

To find the number of atoms in 0.10 mol of PtCl₂(NH₃)₂, calculate the total atoms per molecule (11 atoms) and multiply by Avogadro's number and the moles given, resulting in 6.622 x 10²² atoms.

Explanation:

The subject of the question is determining the number of atoms in a given quantity of a compound, in this case, the compound is PtCl₂(NH₃)₂. To calculate the number of atoms in 0.10 mol of PtCl₂(NH₃)₂, we have to first identify the number of each type of atom within one molecule of the compound. There is 1 platinum (Pt) atom, 2 chlorine (Cl) atoms, and 2 ammonia (NH₃) molecules, which equates to 2 nitrogen (N) atoms and 6 hydrogen (H) atoms. In total, one molecule of the compound contains 1 + 2 + 2 + 6 = 11 atoms.

To find the total number of atoms in 0.10 mol, you multiply the number of atoms in one molecule by Avogadro's number (6.022 x 10²³ atoms/mole), which provides the number of atoms in one mole. Therefore, 0.10 mol of this compound will contain (11 atoms/molecule) x (6.022 x 10²³ atoms/mole) x 0.10 mol = 6.622 x 10²² atoms.

Answer: color change , temperature change, precipitate formation,  gas formation

Explanation:

A physical change is defined as the change in which shape, size of the atoms change. No new substance gets formed in these reactions.

Example: cutting a solid into smaller pieces

A chemical change is defined as the change in which change in chemical composition of atoms takes place. A new substance is formed in these reactions.

Characteristics of chemical reaction:

1. Change in color

2. Formation of precipitate

3. Energy is lost or absorbed

Final answer:

The volume of a 1.2M glucose solution that can be prepared with 0.50 moles of C6H12O6 is approximately 0.417 liters (417 mL).

Explanation:

To determine how many liters of a 1.2M solution can be prepared with 0.50 moles of C6H12O6 (glucose), we use the molarity equation M = n/V, where M is the molarity, n is the number of moles, and V is the volume in liters. Rearranging the equation to solve for V, we get V = n/M.

Using the given values, we calculate the volume (V) as V = 0.50 moles / 1.2 mol/L = 0.4167 liters. Therefore, you can prepare approximately 0.417 liters (417 mL) of a 1.2M glucose solution using 0.50 moles of C6H12O6.

The list includes elements (Oxygen Gas, Platinum), compounds (Carbon dioxide gas, Silver nitrate), homogeneous mixtures (Chicken broth, Salt water, Sprite), and heterogeneous mixtures (Peanut butter and Jelly sandwiches, Muddy water, 14 k gold).

Here are the classifications for each item listed:

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Answer:

True

Explanation:

0.499 mg will remain after 13.0 days. So, the correct answer is (E).

The time which is required for a quantity to reduce to half of its initial value is defined as Half life. This is commonly used in nuclear physics to for the description of unstable atoms undergo radioactive decay or how much time stable atoms survive.

Formula for Half Life,

t1/2 = ln 2 / λ

where,

t1/2 is half-life

λ is radioactive decay constant

For given information,

here, t1/2 = 8.04 days

so, 8.04 days    = ln 2 / λ                        

λ  = ln 2 / 8.04 days

As per Radioactive decay law,

[tex]N_t = N_o[/tex]e∧(-λt)

where,

[tex]N_t[/tex] is amount of compound at t time,

[tex]N_o[/tex] is amount of compound at  t = 0 time

t is time taken to decay

λ is radioactive decay constant.

[tex]N_o[/tex] = 1.53 mg

λ  = ln 2 / 8.04 days = 0.693 / 8.04 days

t  = 13.0 days

By substituting,

[tex]N_t[/tex]= 1.53 mg e∧{(-0.693/8.04 days) x 13.0 days)}

[tex]N_t[/tex] = 0.4989 mg = 0.0.499 mg

Hence, mass of remaining sample after 13.0 days = 0.499 mg

Thus, 0.499 mg will remain after 13.0 days. So, the correct answer is (E).

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The Lewis structure for MgI2 shows 3 lone pairs of electrons on each I atom and no lone pairs on the Mg atom.

The Lewis structure for MgI2 can be drawn by following a few steps:

The final Lewis structure for MgI2 will have 3 lone pairs of electrons on each I atom and no lone pairs on the Mg atom.

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O2 experiences London dispersion forces, NBr3 experiences dipole-dipole interaction, CH4 experiences London dispersion forces, and HF experiences hydrogen bonding due to the presence of a hydrogen atom bonded to a highly electronegative atom.

The given molecules show different types of intermolecular forces. Oxygen gas (O2) is a non-polar molecule and it interacts through London dispersion forces, the weakest form of forces. Nitrogen tribromide (NBr3) has polar bonds, so this compound's main intermolecular force would be dipole-dipole interaction. Methane (CH4) is non-polar, so the intermolecular forces are due to London dispersion forces. Hydrogen Fluoride (HF) experiences hydrogen bonding because it contains a hydrogen atom bonded to a more electronegative atom, fluorine.

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A waxing moon means that the moon is increasing in the illuminated portion visible from Earth, growing each day from a new moon to a full moon. In contrast, the waning moon is decreasing in illumination following the full moon.

A waxing moon indicates that the moon is increasing or growing larger. This occurs during the portion of the lunar cycle from the new moon to the full moon. As the moon waxes, the lighted portion that is visible from Earth gets larger each day. For example, during the waxing gibbous phase, more than half but less than all of the moon's near side is illuminated, and it keeps growing until it is a full moon.

In contrast, a waning moon is one that is decreasing or growing smaller, which happens during the portion of the lunar cycle when the lighted portion seen from Earth gets smaller each day after the full moon. Notably, the waxing and waning periods of the lunar cycle each last about 14.8 days within the roughly 29.5-day lunar month.

Answer:

25%

Explanation:

Efficiency of an engine is calculated by dividing the energy output over the energy input and expressing that as a percentage.  

Efficiency = [tex]\frac{energy output}{energy input}[/tex] x 100%

Given,  

Heat input = 1000 J  

Heat wasted = 750 J

Heat used = 1000 J – 750 J = 250 J  

Efficiency = [tex]\frac{250 J }{1000 J}[/tex] x 100% = 25%

The pH of a 0.45 M solution of aniline (C6H5NH2) is 9.4.

The pH of a 0.45 M solution of aniline (C6H5NH2) can be calculated using the given pKb value of 9.40.

To find the pH, we need to find the pOH first using the pKb value:

pOH = 14 - pKb = 14 - 9.40 = 4.6

Then, we can use the equation pH + pOH = 14 to find the pH:

pH = 14 - pOH = 14 - 4.6 = 9.4

Therefore, the pH of the solution is 9.4.

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The pH of a 0.45 M solution of aniline, given that its pKb is 9.40, is calculated to be approximately 10.99 after taking into account the equilibrium constant Kb for aniline and the concentration of OH- ions introduced on the ionization of aniline.

To calculate the pH of a 0.45 M solution of aniline (C6H5NH2), we need to take into account its pKb value, 9.40. Aniline is a weak base, and we can use the formula pOH = pKb - log[(base)/(acid)]. First, we have to calculate the equilibrium constant Kb for aniline which is Kw/Ka = 10^-14 / Ka. We know Ka equals 10^-5.6, hence Kb for aniline = 10^-14 / 10^-5.6 = 4.3 × 10^-10.

Next, using an approximation approach and the ICE table, we calculate the concentration of OH- introduced by aniline when it ionizes, and find it to be roughly 9.7 × 10-4 M. The pOH of the solution is then -log(9.7 × 10-4) which equals 3.01. To get the pH, we subtract this from 14 (since pH + pOH = 14), yielding a pH for the solution of approximately 10.99.

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When 352 g of Fe₂O₃ reacts with excess CO, it produces 4.41 mol of Fe.

To determine how much Fe (iron) is produced when 352 g of Fe₂O₃ reacts with excess CO, follow these steps:

Calculate moles of Fe₂O₃:

The molar mass of Fe₂O₃ is 159.7 g/mol.

Moles of Fe₂O₃ = 352 g / 159.7 g/mol = 2.20 mol Fe₂O₃.

Determine the mole ratio of Fe₂O₃ to Fe using the balanced equation:

The balanced equation is Fe₂O₃ + 3CO → 3CO₂ + 2Fe.

1 mol of Fe₂O₃ produces 2 mol of Fe.

Calculate moles of Fe produced:

Moles of Fe = 2.20 mol Fe₂O₃ * 2 mol Fe / 1 mol Fe₂O₃ = 4.40 mol Fe.

Convert moles of Fe to grams:

The molar mass of Fe is 55.85 g/mol.

Mass of Fe = 4.40 mol * 55.85 g/mol = 245.74 g of Fe.

The correct answer is option 1: 4.41 mol Fe.

Trans-2-butene's C=C double bond can be indicated by IR absorption signals of C-H stretching near 3100 cm⁻¹ for the =CH₂ group, 3020 cm⁻¹ for the –CH= group and C-H out-of-plane bending near 915 cm⁻¹ and 1000 cm⁻¹

To indicate the presence of a C=C double bond in trans-2-butene despite the absence of a distinct signal in the double bond region of the infrared spectrum (1600–1850 cm−1), one would look for other characteristic IR absorption signals. These include the C-H stretching vibrations associated with alkenes, found around 3100 cm⁻¹ for the =CH2 group and around 3020 cm⁻¹ for the –CH= group. Additionally, the out-of-plane bending vibrations of the C-H bonds at the terminal =CH2 group occur near 915 cm⁻¹ and those of the –CH= grouping near 1000 cm⁻¹. These peaks would be indicative of the alkenic C-H bonds as opposed to alkane C-H stretches, which occur at slightly different frequencies.

Cows can derive energy from cellulose-rich grass due to the presence of symbiotic bacteria in their digestive system, which secrete an enzyme called cellulase, breaking down cellulose into usable glucose monomers. Their multiple-chambered stomach and appendix further facilitate cellulose digestion. This unique adaptation allows cows and other ruminants to utilize cellulose as an energy source.

Cows and other herbivores are able to derive energy from cellulose-rich grass due to symbiotic bacteria that reside in their rumen, a part of their digestive system. These bacteria secrete an enzyme called cellulase which breaks down cellulose into glucose monomers, providing a viable energy source for the animal. Herbivores, such as cows, buffalos, and horses, possess a multiple-chambered stomach where cellulose digestion mostly occurs, and also an appendix where bacteria help in further breaking down cellulose.

Cellulose is composed of glucose monomers packed tightly as extended long chains, giving it its high tensile strength and rigidity, an important attribute for plant cells. It's interesting to note that every other glucose monomer in cellulose is flipped over, which adds to its complexity and indigestibility in many animals including humans. However, the unique digestive system of ruminants, rooms for cellulase-secreting bacteria such as those in the rumen and appendix, enable them to utilize cellulose as an energy source.

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Answer:

Aluminium.

Explanation:

Hello,

In this case, the most appropriated metal turns out being the Aluminum since  it is higher in the activity series than nickel. Don't forget that activity series is an empirical tool used to predict products in displacement reactions and reactivity of metals with water and acids in replacement reactions and ore extraction.

Best regards.