What is the name of LiBr and what is the charge of the cation (indicate the number and - or +)?​

Answer:

The copper pan!

Explanation:

Copper conducts heat well because its atoms contain only one free valence electrons in the outer shell. Elements with a low number of valence electrons transfer heat the best, and copper has only one. Valence electrons move about freely.

Good luck on your assignment!

the pH at the neutralization point is:  \(pH = -log[H3O^+] = -log(1.68 \times 10^-4) = 3.77\)

To determine the pH at the neutralization point, we first need to calculate the moles of   \(NaOH\) used to neutralize the acetic acid:

moles of   \(CH3COOH =\) (volume in liters) x (concentration in mol/L) = \((25/1000) x 10 = 0.25 mmol\)

moles of  \(NaOH =\) (concentration in mol/L) x (volume in liters)  \(= 0.050 x\)(volume in liters)

At the neutralization point, the moles of   \(NaOH\) will be equal to the moles of  \(CH3COOH\) :

\(0.25 mmol = 0.050 \times\) (volume in liters)

volume in liters \(= 5 mL\)

So, it takes \(5 mL\) of  \(0.050 M NaOH\) to neutralize \(25 mL\) of 0.10 M \(CH_3COOH.\)

Now, we need to calculate the concentration of  \(CH3COOH\) and  \(CH3COO-\)(acetate ion) in the solution after the addition of 5 mL of NaOH:

moles of CH3COOH remaining = moles of \(CH_3COOH\) initially - moles of NaOH added

\(= 0.25 mmol - 0.050 mmol = 0.20 mmol\)

volume of final solution \(= 25 mL + 5 mL = 30 mL\)

concentration of  \(CH_3COOH =\) (moles of \(CH_3COOH\) remaining) / (volume in liters) \(= 0.20 mmol / 0.030 L = 6.67 mM\)

concentration of CH3COO- = (moles of NaOH added) / (volume in liters) \(= 0.050 mmol / 0.030 L = 1.67 mM\)

Next, we can use the equilibrium expression for the dissociation of acetic acid to calculate the pH:

\(CH3COOH + H2O \rightleftharpoons CH3COO- + H3O+\)

\(Ka = [CH3COO-][H3O+] / [CH3COOH]\)

At the neutralization point, \([CH3COOH] = [CH3COO-] = 0.5 \times 6.67 mM = 3.33 mM\)

\(Ka = 1.8 x 10^-5\)

Solving for \([H3O^+]\), we get:

\([H3O+] = \sqrt (Ka x [CH3COOH]) = \sqrt (1.8 \times 10^-5 \times 3.33 \times 10^-3) = 1.68 \times 10^-4 M\)

Therefore, the pH at the neutralization point is:  \(pH = -log[H3O^+] = -log(1.68 \times 10^-4) = 3.77\)

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Answer:

The chemical reaction identified is:

2Al + 3CuCl2 → 2AlCl3 + 3Cu

In this reaction, aluminum (Al) reacts with copper chloride (CuCl2) to form aluminum chloride (AlCl3) and copper (Cu). The coefficients in front of the chemical formulas indicate the stoichiometric ratio of the reactants and products, which means that two moles of Al react with three moles of CuCl2 to produce two moles of AlCl3 and three moles of Cu.

The correct answer is 25% CH4, 50% O2, 12.5% CO2, and 25% H2O by percentage composition.

According to the chemical equation, for every molecule of CH4 burned, we need two molecules of O2. So we can assume that we have 10 mL of CH4 and 40 mL of O2, which will react completely.

Using the ideal gas law, we can find the number of moles of each gas present:

n(CH4) = (0.020 L)(1.00 atm)/(0.0821 L atm/mol K)(298 K) = 0.000964 mol

n(O2) = (0.080 L)(1.00 atm)/(0.0821 L atm/mol K)(298 K) = 0.00386 mol

From the balanced equation, we see that the volume ratio of CH4 to CO2 to H2O is 1:1:2. Therefore:

n(CO2) = n(CH4) = 0.000964 mol

n(H2O) = 2n(CH4) = 0.00193 mol

The total number of moles in the mixture is:

n(total) = n(CH4) + n(O2) + n(CO2) + n(H2O) = 0.000964 + 0.00386 + 0.000964 + 0.00193 = 0.00772 mol

The percentage composition by volume of each gas is equal to the number of moles of the gas divided by the total number of moles, multiplied by 100%:

% CH4 = (0.000964 mol/0.00772 mol) x 100% = 12.5%

% O2 = (0.00386 mol/0.00772 mol) x 100% = 50%

% CO2 = (0.000964 mol/0.00772 mol) x 100% = 12.5%

% H2O = (0.00193 mol/0.00772 mol) x 100% = 25%

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Answer:

which property is least helpful in identifying a sample of matter is (B) VOLUME

Explanation:

volume depend on the amount of substance present and are not useful in the identification of a sample of matter. volume is an extensive property so it is not useful identifying the sample of matter.

Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

1) chiral

2) achiral

3) achiral

4) chiral

5) achiral

The molecules given are 1. Chiral, 2. Achiral, 3. Achiral, 4. Chiral, 5. Achiral. Chiral and achiral molecules are terms used to describe the symmetry or asymmetry of molecules.

Chiral molecules are non-superimposable mirror images of each other. They possess a property called chirality, which means they have a distinct handedness or "handed" nature. Chiral molecules cannot be aligned or superimposed onto their mirror images.

Achiral molecules are superimposable in their mirror images. They possess a plane of symmetry, which means the molecule can be divided into two identical halves by a plane passing through its center.

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Answer:

the difference in electronegativity is so large (2.04) that the bonding electrons spend almost all their time on the nitrogen atom.

Explanation:

Because calcium loses 2 electrons to become Ca2+, and nitrogen gains 3 electrons to become N3−, you need two calcium atoms and three nitrogen atoms in order to form a neutral compound.

answer and explnation on the picture if you have any quation let me know  

Answer:

False

Explanation:

the sum of protons and neutrons gives us the mass number

A solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.

We must first convert the amount of nitrate(V) ions in drinking water to moles per litre since the threshold concentration over which "Blue-Baby" Syndrome might manifest is 0.05 mg/cm3.

It is necessary to know the molar mass of nitrate(V) ions in order to convert from mg/cm3 to moles per litre (NO3-).

The formula below can be used to determine NO3-'s molar mass:

N: 14.01 g/mol for the atomic mass

O: 16.00 g/mol is the atomic mass (3 oxygen atoms in NO3-)

NO3-'s total molar mass is equal to 14.01 + 16.00 x 3 = 62.01 g/mol.

Let's now translate the specified concentration from mg/cm3 to moles/liter (M).

As 1 g = 1000 mg, 1 mg/cm3 is 0.001 g/cm3.

1 cm3 = 0.001 g/mL multiplied by 0.001 g/cm3

1 L/1000 mL x 0.001 g/mL = 0.001 g/L

We must change the grams into moles using the molar mass in order to get the molarity:

1.61 × 10-5 mol/L = 0.001 g/L / 62.01 g/mol

As a result, a solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.

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Answer:

D.) State the question, form a hypothesis, conduct an experiment

Explanation:

https://www.colorincolorado.org/article/steps-scientific-process

Based on valence electron trends, the correct answer is C. Group 3A or 13.

Based on trends in valence electrons, the group of pairs with a group 5 non-metal, such as nitrogen (N), in a 1:1 ratio is Group 3A or 13. Group 5 non-metals have 5 valence electrons, and they tend to form compounds by either gaining 3 electrons to achieve a stable octet or by sharing 3 electrons in covalent bonds.

Group 1A or 1 elements, such as hydrogen (H) and lithium (Li), have only 1 valence electron. They would need to gain 4 additional electrons to achieve a stable octet, which is energetically unfavorable.

Group 2A or 2 elements, such as beryllium (Be) and magnesium (Mg), have 2 valence electrons. They would need to gain 3 additional electrons to achieve a stable octet, which is also energetically unfavorable.

Group 6A or 16 elements, such as oxygen (O) and sulfur (S), have 6 valence electrons. They would need to gain only 1 additional electron to achieve a stable octet, making them more likely to form a 2:1 ratio with a group 5 non-metal.

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The theoretical yield of Acetylsalicylic acid is found out to be: 3.01 grams.

The limiting reagent is a substance that prevents a chemical reaction from occurring completely.

When a limiting reagent is used in a chemical reaction, the atoms, molecules, or ions of the other reactant that it (the limiting reagent) reacts with will either stay free or unreacted.

Popular compounds called acids and bases interact with one another to create salt and water. The Latin word "acere," which meaning "sour," is where the term "acid" originates.

According to the problem, we have 2.31 grams of salicylic acid. We need to determine the theoretical yield of acetylsalicylic acid.

The molar mass of salicylic acid is 138.12 g/mol. Therefore, the number of moles of salicylic acid we have is:

n = mass / molar mass

n = 2.31 g / 138.12 g/mol

n = 0.0167 mol

According to the balanced equation, 1 mole of salicylic acid reacts with 1 mole of acetic anhydride to produce 1 mole of acetylsalicylic acid. Therefore, the number of moles of acetylsalicylic acid produced is also 0.0167 mol.

The molar mass of acetylsalicylic acid is 180.16 g/mol. Therefore, the theoretical yield of acetylsalicylic acid is:

mass = n x molar mass

mass = 0.0167 mol x 180.16 g/mol

mass = 3.01 g

Therefore, the theoretical yield of acetylsalicylic acid is 3.01 grams.

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Answer:

The answer is C... I am almost positive.

Answer:

66 grams of ice would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C.

Explanation:

To calculate the amount of ice that would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C, we need to use the formula:

Q = m_water * c_water * ΔT_water + m_ice * Lf

where,
Q = the amount of heat transferred,
m_water = the mass of water, c_water is the specific heat capacity of water,
ΔT_water = the change in temperature of water, m_ice = the mass of ice,
Lf = the specific latent heat of fusion of ice.

First, let's calculate the amount of heat transferred to the water:

Q = m_water * c_water * ΔT_water
Q = 352 g * 1.0 cal/(g*°C) * (15-0) °C
Q = 5,280 cal

Next, we can use the specific latent heat of fusion of ice, which is 80 cal/g, to calculate the amount of heat required to melt the ice:

Q = m_ice * Lf
Q = m_ice * 80 cal/g
m_ice = Q / Lf
m_ice = 5,280 cal / 80 cal/g
m_ice = 66 g

Answer:

Explanation:

We can use the formula:

q = mcΔT

where q is the heat absorbed, m is the mass, c is the specific heat, and ΔT is the change in temperature.

Given:
specific heat of iron (c) = 0.449 J/g°C
initial temperature (T1) = 24.0°C
final temperature (T2) = 82.1°C
heat absorbed (q) = 948.0 J

Substituting the given values into the formula, we get:

q = mcΔT
948.0 J = m(0.449 J/g°C)(82.1°C - 24.0°C)
948.0 J = m(0.449 J/g°C)(58.1°C)
m = 948.0 J ÷ (0.449 J/g°C × 58.1°C)
m = 33.1 g

Therefore, the mass of the iron piece is 33.1 g (to three significant figures)

Answer:

I think it's 10 electrons

Answer:

10 electrons I believe

Explanation:

5 atomic orbitals in 5d sublevel x 2 electrons/orbital = 10 electrons can reside in the 3d sublevel.

11.7 mL is the volume required for a 3M aqueous solution to produce 25 grams of the precipitate.

Volume of solution = 3M

Mass of precipitate = 25g

The chemical balance equation between  sodium phosphate and iron(II) chloride is:

\(2 Na_{3} PO_4(aq) + 3 FeCl_2(aq) -- > Fe_3(PO_4)_2(s) + 6 NaCl(aq)\)

To calculate the moles of Iron phosphate,

moles of \(Fe_3(PO_4)_2\) = mass of \(Fe_3(PO_4)_2\)  / molar mass of  \(Fe_3(PO_4)_2\)

The molar mass of  \(Fe_3(PO_4)_2\) is calculated as:

\(Fe_3(PO_4)_2\)  = 3 Fe atoms x atomic mass of Fe + 2 \((PO_4)\) groups x molar mass of  \((PO_4)\)

\(Fe_3(PO_4)_2\)  = 3 x (55.845 mol) + 2(2 x 31.0g) + (8 x 16.0 g/mol)

\(Fe_3(PO_4)_2\)  = 357.696 g/mol

The moles  \(Fe_3(PO_4)_2\) produced:

moles of \(Fe_3(PO_4)_2\)  = 25 g / 357.696 g/mol

moles of \(Fe_3(PO_4)_2\)  = 0.070 moles

moles of \(Na_3PO_4\) = 0.070 moles / 2

moles of \(Na_3PO_4\)  = 0.035 moles

The volume of solution required for   \(Na_3PO_4\) :

moles of  \(Na_3PO_4\) = M x V

V = moles of  \(Na_3PO_4\) / M

V = 0.035 moles / 3 M

V = 0.0117 L

V = 11.7 mL

Therefore, the volume required is approximately 11.7 mL.

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Answer:

Yes

Explanation:

it is

At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

should be Chromium(III) sulfate:  Cr₂(SO₄)₃

the oxidation number:

Cr₂(SO₄)₃ = 0

Cr = +3

SO₄ = -2

S + 4.O = -2

S + 4.-2 = -2

S = +6

Answer:

2 Hg (g) + o2 ---> 2 H2o

equilibrium constant

K = (c) (d) / (a)(b)

K= ( H2o)²/(He) ²(o2)

Since non-metals (-ve ion) are "stronger" than metals (+ve ion), they may easily obtain electrons from metals. Ionic bonds are created when these two opposing ions are drawn to one another.

The term "metal" refers to any one of a group of materials with high thermal and electrical conductivities, as well as malleability, ductility, and high light reflection.

During the hippy era, when "heavy" indicated serious or profound, the term "metal" is thought to have originated. A few essential elements make up metal music: forceful drumming, extra-low bass notes, and angry or throaty vocals. The guitar riffs and chords are sometimes greatly distorted.

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Answer:

a. Ca₃(PO₄)₂.

b. 0.010 moles of Ca₃(PO₄)₂ can we expect to be produced

c. 3.1g of Ca₃(PO₄)₂

d. Percent yield = 93.5%

Explanation:

a. Based on the reaction:

3Ca(NO₃)₂(aq) + 2Na₃PO₄(aq) → Ca₃(PO₄)₂(s) + 6NaNO₃(aq)

3 moles of calcium nitrate reacts with 2 moles of sodium phosphate producieng 1 mole of calcium phosphate.

As you can see, Ca₃(PO₄)₂ is a solid product -(s)-, that means when the reaction occurs the precipitate produced is the solid,

b. As 3 moles of calcium nitrate produce 1 mole of calcium phosphate and there are 0.030 moles of calcium nitrate

0.030 moles Ca(NO₃)₂ × (1 mol Ca₃(PO₄)₂ / 3 moles Ca(NO₃)₂) =

c. As molar mass of Ca₃(PO₄)₂ is 310.18g/mol, the mass of 0.010 moles (The expected mass) is;

0.010 moles Ca₃(PO₄)₂ × (310.18g / mol) =

d. The percent yield is defined as 100 times the ratio between the obtained yield (That is 2.9g of precipitate, Ca₃(PO₄)₂) and the expected yield, 3.1g of Ca₃(PO₄)₂:

\(\frac{2.9g}{3.1g} *100\)

(a) The product in solid state would be the precipitate. Hence, the precipitate would be Ca3(PO4)2

(b) From the balanced equation of the reaction: 3 moles of Ca(NO3)2 is required for 1 mole of Ca3(PO4)2

If there are just 0.030 moles of Ca(NO3)2, then"

3 moles = 1

0.030 moles =    1 x 0.030/3

                         = 0.01 moles of Ca3(PO4)2

In other words, 0.01 moles of the precipitate would be expected to be produced from 0.030 moles of calcium nitrate.

(c) 0.01 moles solid (Ca3(PO4)2) is expected. Mass of Ca3(PO4)2 expected:

      mass   = mole x molar mass

molar mass of Ca3(PO4)2 = 310.18 g/mol

mass of Ca3(PO4)2 expected to be produced = 0.01 x 310.18

                                                                       = 3.1018 g

Hence, 3.1018g of solid is expected to be produced.

(d) Percentage yield = actual yield/theoretical yield x 100

                          = 2.9/3.1018 x 100

                               = 93.5%

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Answer:

so so

Explanation:

this your question?? <_>

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

5.8e-7

Do you understand what e stands for?

Answer:

the answer is 29/5×10⁷ ...you can see the picture above ^^

but when i use calculator, the answer is 5.8×10 to the power of -7

both the answer in the picture above are same with the answer in the calculator

Answer:

161.57 K

Explanation:

V1/T1 = v2/T2

(5.24 L)/(411 K) = (2.06 L)/T2

T2 = 161.57 K