Question 5 of 25
What is the name of the branched alkane shown below?

Answer:

0.637 V

Explanation:

The balanced redox reaction is:

Here Zn undergoes oxidation by loss of electrons, thus act as anode. Lead undergoes reduction by gain of electrons and thus act as cathode.

Where both are standard reduction potentials.

= -0.763

= -0.126

The standard emf of a cell is 0.637 V

Answer: 0.108

Explanation:

use v1s1 = v2s2

here v1 = 2.7ml s1 = 4 M v2 = 100ml s2=?

Under condition (b), where P=Pext=constant (where P and Pext are, respectively, the pressure inside and outside the system), the enthalpy change for a process is equal to the heat exchanged between the system and surroundings.

In a constant volume calorimeter, the system is sealed or isolated from its surroundings, which accounts for why its volume is fixed and there is no volume-pressure work done. An isochoric process is another name for a constant volume process. An illustration would be the addition of heat to a gas in a container with fixed walls. The gas cannot function because the walls cannot be moved: W = 0.

He discovered that under constant temperature, the relationship between a gas's pressure and volume is inverse. Boyle's law, which first established in 1662, asserts that the volume and pressure of an ideal gas of a given mass in a closed system are always constant at constant temperature.

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A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol, the molecular formula is NO₂.

We must compute the empirical formula in order to ascertain the compound's chemical composition.

If we have 100 grams of the compound.

This suggests we have:

30.4 g of nitrogen

69.6 g of oxygen

Now, we have to convert the mass of each element to moles.

The molar mass of nitrogen (N) = 14.01 g/mol

the molar mass of oxygen (O)  =  16.00 g/mol.

Number of moles of nitrogen (N):

2.17 mol

Number of moles of oxygen (O):

4.35 mol

The simplest whole-number ratio between the moles of nitrogen and oxygen must now be determined. To calculate the ratio, we divide both numbers by the smaller value.

Moles N / moles O = 2.17 mol / 2.17 mol = 1.00

Moles O / moles O = 4.35 mol / 2.17 mol = 2.00

The ratio is approximately N₁O₂.

We divide the subscripts by their greatest common divisor to obtain the simplest ratio, since we are looking for the empirical formula. The empirical formula is NO₂ since the greatest common divisor in this situation is 1.

The molecular formula of the compound is NO₂.

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Answer:

one from each parent

Explanation:

Since what we have is an alpha decay, the missing component is 234/90 Th

Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, which is a helium nucleus consisting of two protons and two neutrons. During alpha decay, the atomic number of the parent nucleus decreases by two, and the mass number decreases by four.

Apha particles can be stopped by a thin layer of material such as paper or skin, and they do not penetrate very far into matter.

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Metal ions form solid metal is the correct statement about what happens at the cathode.

Option D is correct.

The electrode from which a regular current exit a polarized electrical device is referred to as the cathode.

Reduction occurs at the cathode, and oxidation occurs at the anode. These processes are taking place on metal surfaces, or electrodes, thanks to electrochemistry.

Anode and cathode, respectively, have the symbols A and K.

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Magnesium was 5.0g before heating.

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I would say Phenolphthalein

The concentration of A after 38.02 s is 0.057 M.

The concentration of A after 38.02 s is calculated by using rate equation as follows;

[A] = [A]₀e^(-kt)

where;

The concentration of A after 38.02 s is calculated as;

[A] = [A]₀e^(-kt)

   = 0.95 M e^(-0.0739 s⁻¹  x 38.02 s)

   = 0.057 M

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From the given data, the name of the hydrated salt would be  \(CoCl_2.83H_2O\).

The formula of the hydrated salt can be determined using the empirical formula approach. That is, we will find the mole equivalent of the anhydrous salt and the water of hydration and then combine them into a single formula after dividing by the smallest mole.

First, we need to determine the mass of the anhydrous salt and the water of hydration.

Mass of crucible (x) = 12.090 g

Mass of hydrated salt + crucible (y) = 16.250 g

Thus, the mass of the hydrated salt can be determined by subtracting x from y.

Mass of hydrated salt = 16.250 - 12.090 = 4.16 g

Mass of hydrate + crucible after evaporating off the water (z) = 12.424 g

Mass of anhydrous salt = z - x

                                      = 12.424 - 12.090

                                      = 0.334 g

Mass of water = 4.16 - 0.334

                        = 3.826 g

Now, let's find the moles:

Molar mass of \(CoCl_2\) = 129.839 g/mol

Molar mass of water = 18.01 g/mol

Mole of \(CoCl_2\) = 0.334/129.839 = 0.00257 mol

Mole of water = 3.826/18.01 = 0.2124 mol

Dividing through by the smallest mole

\(CoCl_2\) =  0.00257 / 0.00257  = 1

water = 0.2124/ 0.00257 = 83

Thus, the formula of the hydrate would be \(CoCl_2.83H_2O\)

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Answer:

D.  400 cal

Explanation:

Spec heat of water   1 cal/gm-C

1 cal / gm-C   * 100 gm * ( 20-16 C) = 400 cal

Cu + O2 --->  CuO2 -The first reaction is a combustion reaction

2 HCl + Mg → H2 + MgCl2- The second reaction is a Single replacement reaction

A combustion reaction is a type of chemical reaction that occurs between a fuel and an oxidizer in the presence of heat or light, resulting in the release of energy in the form of heat and light.

In other words, it is a reaction in which a substance reacts with oxygen to produce heat and light.

Combustion reactions are important in many aspects of daily life, including the burning of fossil fuels for energy production, the combustion of wood or other materials for heating or cooking, and the combustion of fuels in internal combustion engines.

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Fossil fuels are essential part of the power generation in the world. They are easily combustible and more reliable and cheaper. However, the burning of fossil fuels releases toxic gases  to the environment.

Fossil fuels are fuel generated from the decomposition materials. Petroleum, coal, natural gas  etc. are fossil fuels which are excavating from the earth.

Fossil fuels are non-renewable sources of energy. Hence, as the existing fossil sources are exhausted no more fossil fuel can be made. It is cheaper, reliable and easy to use.

However, the toxic hydrocarbon gases released from the burning of fossil fuels make the environment polluted. Therefore, overuse of fossil fuel definitely rise the atmospheric pollution.

Its use over the next 50 years, will increase the global warming and more of it will be exhausted.

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Answer: ITS C OR B I THINK BUT I HAVE A FEELING ITS ONE OF THOSE

Explanation:

IM SO SORRY IF ITS WRONG KSDBDZDH

Answer:

C. Patterns

Explanation:

I got it right on usatestprep

In a vacuum, all different types of light waves have the same speed (Option 3).

Light is energy emitted as waves that travel to a given frequency and speed. These light waves emit electricity and magnetism and have the same speed when they are found in space (vacuum).

Light waves can take many different forms which include:

Therefore, with this data, we can see that light waves travel to a given velocity which is the same in equal conditions as occurs in space where conditions are equal.

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Answer:

the last one i think

Explanation:

Answer:

A single time the hail stone was drafted up and down in the atmosphere

Explanation:

The frequency of the radiation is equal to \(7.17 \times 10^{19}\) Hertz.

Given the following data:

To find the frequency of this radiation, we would use the Planck-Einstein equation.

Mathematically, the Planck-Einstein relation is given by the formula:

\(E = hf\)

Where:

Substituting the given parameters into the formula, we have;

\(4.75 \times 10^{-14} = 6.626 \times 10^{-34} \times F\\\\F = \frac{4.75 \times 10^{-14}}{6.626 \times 10^{-34}}\)

Frequency, F = \(7.17 \times 10^{19}\) Hertz

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There are 2.64 × 1022 molecules of sucrose present in this serving of fruit dessert containing 15.0 g of sugar.

To determine the number of molecules of sugar present in the serving, we need to calculate the number of moles of sugar and then convert it to the number of molecules.

Given:

Mass of sugar (sucrose) = 15.0 g

Molar mass of sucrose (C12H22O11) = 342 g/mol

First, calculate the number of moles of sugar using the formula:

Number of moles = Mass of substance / Molar mass

Number of moles of sugar = 15.0 g / 342 g/mol ≈ 0.0439 mol

Next, we use Avogadro's number, which states that there are approximately 6.022 × 10^23 molecules in one mole of a substance. Therefore, to find the number of molecules of sugar:

Number of molecules = Number of moles × Avogadro's number

Number of molecules of sugar = 0.0439 mol × 6.022 × 10^23 molecules/mol ≈ 2.64 × 10^22 molecules

Therefore, there are approximately 2.64 × 10^22 molecules of sugar present in this serving.

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Answer:

The evaporation will take place - then once the liquid has reached its boiling point it will start to change into a gas.

The molar mass in grams of "one mole" of each substance is:

Fe: 55.845 g/mol

\(Cl_2\): 70.906 g/mol

\(FeCl_3\): 162.204 g/mol

To calculate the molar mass in grams of "one mole" of each substance, we need to determine the atomic masses of the elements involved in the equation.

The atomic mass of iron (Fe) is 55.845 g/mol.

For chlorine (\(Cl_2\)), we need to consider that the molar mass of \(Cl_2\) is twice the atomic mass of chlorine because the formula shows that two chlorine atoms combine to form one molecule of \(Cl_2\). The atomic mass of chlorine is 35.453 g/mol, so the molar mass of \(Cl_2\) is 2 * 35.453 g/mol = 70.906 g/mol.

The formula for iron(III) chloride (\(FeCl_3\)) indicates that one mole of \(FeCl_3\)contains one mole of iron and three moles of chlorine. Therefore, we can calculate the molar mass of \(FeCl_3\)by summing the atomic masses of iron and chlorine:

Molar mass of \(FeCl_3\)= (1 * atomic mass of Fe) + (3 * atomic mass of Cl)

Substituting the values, we have:

Molar mass of \(FeCl_3\) = (1 * 55.845 g/mol) + (3 * 35.453 g/mol)

= 55.845 g/mol + 106.359 g/mol

= 162.204 g/mol

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The United States experienced a decrease in the real GDP, high inflation, and arising unemployment rate.

The United States appeared to be entering a recession.A recession is a decline in economic activity, characterized by declining GDP, high unemployment rates, and increased unemployment benefits. Economic analysts and the media commonly use a two-quarter consecutive decline in real GDP as a definition of a recession.

The United States is considered to have entered a recession in the 1970s, which was characterized by an energy crisis, inflation, and recession. However, by the end of the decade, the economy had improved, and it entered into the 1980s with a strong economic performance.

The 1970s were a period of high inflation, low growth, and an oil crisis, which had a significant impact on the United States economy. Therefore, it can be concluded that The United States was in the middle of an economic boom before the 1970s recession and entered a recession in the 1970s due to a decrease in the real GDP, high inflation, and arising unemployment rate.

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8.68 g CH₃(CH₂)₈(OH)₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

3.24 × 10²² molecules CH₃(CH₂)₈(OH)₂

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of C - 12.01 g/mol

[PT] Molar Mass of H - 1.01 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of CH₃(CH₂)₈(OH)₂ - 12.01 + 3(1.01) + 8[12.01 + 2(1.01)] + 2[16.00 + 1.01] = 161.3 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

8.67838 g CH₃(CH₂)₈(OH)₂ ≈ 8.68 g CH₃(CH₂)₈(OH)₂

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Jordan is immediately happier when he sees a child walking around with a bunch of balloons, it is a cultural attitude. These attitudes shape our social behaviors.

An individual's attitude refers to the way of thinking and/or feeling about something in particular.

Cultural attitudes refer to the personal system of cultural beliefs that affect and shape specific social behaviors.

Cultural attitudes indicate and trace determined social standards of socio-cultural beauty in order to shape our behavior.

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Answer:

d

Explanation:

neutrons and protons have the mass nearly 1.67*10-24 g

but neutrons have no charge.. protons are positively charged

The value of K is 4.4 represents the equilibrium position of the reaction under the given conditions.

The equilibrium constant (K) for a reaction is a constant value that relates the concentrations of the reactants and products at equilibrium. For the given reaction, the equilibrium concentrations of SO₂, O₂, and SO₃ are given as [SO₂] = 1.50 M, [O₂] = 1.25 M, and [SO₃] = 3.50 M, respectively.

The equilibrium constant (K) for the reaction can be calculated using the equilibrium concentrations of the reactants and products.

K = [SO₃]²/([SO₂]²[O₂])

K = (3.50)²/[(1.50)²(1.25)]

K = 4.48

Therefore, the equilibrium constant (K) for the reaction is 4.48.

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As with most stoichiometry problems, it is necessary to work in moles. The ratio of the moles of each element will provide the ratio of the atoms of each element.

Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages).

Remeber that percentages are a ratio multiplied by 100. You must convert percentages back to their decimal value before working with them.

(.4838) (100 g) = 48.38 g C

(.0812 ) (100 g) = 8.12 g H

(.5350) (100 g) = 53.38 g O

Convert the mass of each element to moles of each element using the atomic masses.

(48.38 g C) (1 mol/ 12.10 g C) = 4.028 mol C

(8.12 g H) (1 mol/ 1.008 g H) = 8.056 mol H

(53.38 g O) (1 mol/ 16.00 g O) = 3.336 mol O

Find the ratio or the moles of each element by dividing the number of moles of each by the smallest number of moles.

Use the mole ratio to write the empirical formula.