I can not figure out problem #10 b and c

The total energy to break the hexane bonds will be equal to the sum of each of the energy to break each bond.

So the first thing we're going to do is determine how many and what type of bonds hexane has. Hexane is an alkane, meaning the C-C bonds are all single bonds. We also have C-H bonds. According to the structure of hexane, we will count each of the bonds in the following figure:

The number of C-H bonds is written in blue, we see that there are 14 C-H bonds, which coincides, being an alkane, with the number of hydrogen atoms.

The number of C-C bonds is written in orange. The number of C-C bonds is equal to 5.

Now, we multiply the energy to break each bond by the number of bonds and add the energy of the C-H and C-C bonds.

So, for 1 mol of hexane the energy. required to break all the bonds will be 7514kJ

Answer: The closest value to the answer is 7520. D) 7520 kJ

An Arrhenius base is a compound which ionizes to yield hydroxide ions (OH−) in aqueous solution.

In the given illustration, it is observed that at first molecules are dispersed without any type of configuration or order and they adapt to the container shape. It means that they represent a liquid.

At the second stage, molecules are ordered and they have a defined shape, which is characteristic of solids.

It means that the change converted a liquid into a solid.

This is known as freezing. A liquid is frozen to became a solid, one example is water and ice.

It means that the correct answer is Freezing.

During freezing you release energy, this is because the liquid has to lose heat to become a solid. The answer to the second part is releases.

1) Converting grams to moles or moles to grams

In order to do this kind of conversion, we need the molar mass (in grams) of the compound to use it as a conversion factor as follows:

-

Answer:

397.8 g of CO2.

Explanation:

First, let's write the chemical equation:

We want to find the grams of CO2 produced by 13.56 moles of O2, so we can find how many moles of CO2 are being produced, so we can do a rule of three based on this logic: you can see that we have 3 moles of O2 reacted producing 2 moles of CO2, so how many moles would we obtain from 13.56 moles of O2?:

The calculation would be:

The final step is to convert from 9.04 moles of CO2 to grams using its molar mass which is 44 g/mol (you can calculate the molar mass of a compound using the periodic table). The conversion would look like this:

We will produce 397.8 g of CO2.

Option B.   All cobalt atoms are identical and are consistent with dalton's atomic theory as it was originally stated.

The primary part of dalton's atomic theory states that everyone relies on is manufactured from atoms, which can be indivisible. the second part of the theory says all atoms of a given element are the same in mass and house. The 0.33 part says compounds are combos of two or more exceptional kinds of atoms.

Dalton's atomic theory, atoms of one element are all the equal or same. for this reason, the assertion that every cobalt atoms are identical is consistent with Dalton's concept of the shape of atoms.

Dalton's atomic concept additionally proposed that each atom of an element is identical in nature and exceptional elements vary in length, mass, and chemical properties. So, the accurate answer is choice 1 which says that the first and 2d statements are correct.

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827.76 m/60.65 s = 13.65 m/s

685.5 mol/0.50 L = 1371 mol/L

20.9476 cm x 26 cm = 545 cm^2

When adding/subtracting

Use the least number of significant figures past the decimal point when adding or subtracting numbers.

When multiplying/dividing

Use the least number of significant figures present in any number in the problem when multiplying or dividing numbers.

Answer

By adding water (H2O)

Explanation

In this reaction, water is a product, adding the product will favour the reverse reaction, which is the formation of more Co(H2O)6^2+.

Step 1

Avogadro's number states that:

1 mole of C3H8 = 44.11 g of C3H8 = 6.02x10^23 formula units (molecules in this case)

---------

Step 2

Information provided:

2.37 g C3H8

The molar mass = 44.11 g/mol

---------

Step 3

Procedure:

44.11 g C3H8 ---------- 6.02x10^23 molecules of C3H8

2.37 g C3H8 ---------- X

X = 2.37 g C3H8 x 6.02x10^23 molecules of C3H8/44.11 g C3H8

X = 3.23x10^22 molecules of C3H8

Answer: Please, revise your options because I cannot find any mistake in my procedure. (Ask your teacher, please)

I found 3.23x10^22 molecules of C3H8 but there is no option alike.

Answer:

the answer is A since the foot is printed

Answer:

It represents a trace evidence,since it leads to a suspect

The sample of hair with exposed follicular tissue is the BEST sample she can send to the lab for DNA testing (Option C).

A DNA sample is any tissue that can be used to extract DNA and therefore it is multipurpose because it can be used to identify an organism, identify polymorphisms, find gene variants associated with a phenotype of interest., etc.

Therefore, with this data, we can see that the sample of a follicular tissue contains DNA which can be used for different purposes such as the identification of an individual.

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The rate constant ( k )= 9.2 x 10⁻³ s⁻¹The half life  (t1/2 )= 75.3 s

It is given that the reaction is 46% complete in 45 s

The relation between rate constant and the half life can be shown as:

For first order reaction:

ln[A]=−kt+ln[A]o

46% complete, 54% remains

A = 0.54

Ao = 1

Put the value of given data in the formula:

ln A = -kt + ln Ao

ln 0.54 = -k.45 + ln 1

-0.616=-k.45

k = 13.6 x 10⁻³ s⁻¹

The half life can be determined by using the formula:

t1/2 = (ln 2) / k

t1/2 = 0.693 / 13.6 x 10⁻³

t1/2 = 0.0509 ×10⁻³ s.

t1/2 = 5.09 ×[tex]10^{5}[/tex] s.

Therefore, the rate constant for the first order reaction will be 13.6 x 10⁻³ s⁻¹ and half life will be 5.09 ×[tex]10^{5}[/tex] s.

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To solve this question we will use the integrated rate late law for first order reaction:

By substituting the values we have to determine the unknown we get:

Answer: Rate constant k is 6.392x10^-4 per min.

The parts of the neuron include (A) dendrites.

As it is given in the description, Synapses are also found on dendrites.

Therefore, the parts of the neuron include (A) dendrites.

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Answer:

Explanation:

Here, we want to get the definition of a weak base

A weak base is a base that does not dissociate completely in solution.

What this means is that when the base is placed in a solution, its dissociation into the corresponding metallic and hydroxide ions is incomplete

Answer: the order of increasing atomic size is: Si < Sn < Pb

Explanation:

The question requires us to arrange the elements Si, Pb and Sn in order of increasing atomic size.

The atomic size of different elements can be compared based on the atomic radius of the atoms. Considering the periodic table, the atomic radius tends to increase from right to left and from the top to the bottom of the table. Therefore, if we locate the elements Si, Pb and Sn on the periodic table, we can compare their size based on the atomic radius tendency.

Looking at a periodic table, we can locate the elements Si, Pb and Sn as it follows (highlighted in red):

Note that these elements belong to the same group and that Si is above Sn, that is above Pb.

Therefore, knowing that the atomic radius increase from the top (Si) to the bottom (Pb), the order of increasing atomic size is: Si < Sn < Pb

The chart of given following ion is

Protons Electrons Neutrons

1) 6 2 8

2) 6 2 7

3) 8 10 9

4) 8 10 8

Simply put, a subatomic particle is a particle that is smaller than an atom. Protons, electrons, and neutrons are the three subatomic particles that may typically be separated from an atom.

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Option B is correct

Given the chemical reaction below;

The equilibrium constant for the reaction is given as;

Given the following parameters

Substitute

Therefore the equilibrium constant for the reaction is 1.7 * 10^-3

To get the number of moles, you need to use this equation:

n = m/M

where n is the number of moles, m is the mass and M is the molar mass of Iron.

Given:

m = 5227 g

M = 55.8 g/mol (from the periodic table)

Therefore

n = 5227 g/55.8 g/mol

n = 93.7

The first option is closer to 93.7 so the answer is the first option.

Answer:

Trigonal planar

Explanation:

Everything is connected to our central atom 'I'.

Iodine has 3 bonds around it: 1 single bond and 2 double bonds.

This 3 bonds will make a trigonal planar, hence the prefix 'tri' in the name (tri stands for the number 3).

The mass of 0.0750 moles of calcium is 3.01g.

To calculate the mass of calcium we need to use the molar mass that we can find in the Periodic Table of Elements.

The molar mass of calcium is 40.1 g/mol.

Now, with a mathematical Rule of Three we can calculate the mass of calcium of 0.0750 moles:

So, the mass of 0.0750 moles of calcium is 3.01g.

M = mol/L

To solve for the number of atoms in a certain amount of moles, we must multiply the number of moles by Avogadro's number ([tex]N_A[/tex]): [tex]6.02*10^{23}[/tex], and multiply the product by the number of atoms in the compound.

We're given:

First, we must find the number of moles. We can do this by first converting 800.0 mL to L and multiplying it by 0.10 M.

800.0 mL ÷ 1000 = 0.8 L

⇒ Now, multiply 0.8 L by 0.10 M:

0.8 L × 0.10 M = 0.08 mol

Now, we must find the number of molecules in this sample. Multiply 0.08 mol by Avogadro's number:

[tex]0.08*6.02*10^{23}\\=0.4816*10^{23}\\=4.816*10^{22}[/tex]

Finally, to find the number of atoms in the sample, multiply the number of molecules by the number of atoms in the compound.

We can begin by finding the number of atoms in sucrose:

[tex]C_{12}H_{22}O_{11}[/tex]

12 + 22 + 11 = 45 atoms

⇒ Multiply 45 atoms by [tex]4.816*10^{22}[/tex] mol:

[tex]45*4.816*10^{22}\\=216.72*10^{22}\\=2.1672*10^{24}[/tex]

Convert to the correct number of significant figures (2):

[tex]=2.17*10^{24}[/tex]

[tex]2.17*10^{24}[/tex] atoms

Introduction

Water is a molecule that composed of chemical elements oxygen and hydrogen. Waterrogen. Water behaves differently than other substances, this is because water can be changed from being a solid to liquid or a gas (vapour). This is known as changing state of matter. Water is a liquid at room temperature, however, it becomes a solid when the temperature is cooled down. The same water can turn into vapour or gas if it is heated up to a certain temperature. Therefore the state of water depends on the temperature.

Solid water

At a temperature below or equal to zero degrees Celsius, the water molecule turns to be a solid (ice), this is called freezing. At this state the water molecules are packed close together, this prevents water from changing its shape, thus, the atoms in solid water are not active, even when ice is removed from its container, it retains its shape. Water in its solid state has a very regular pattern whereby the water molecules are apart from one another and are connected by hydrogen bonds which forms a crystalline lattice. These crystals have a number of open regions and pockets which makes ice less dense than liquid water. This is the main reason ice floats on water. In the solid state, there is not enough thermal energy to overcome the intermolecular forces (hydrogen bonding), thus particles vibrate around fixed axes.

Liquid water

When the ice is warmed from its freezing point, the water molecule changes from solid to liquid water, when the temperature is higher than zero but lower than 100 degrees Celsius. This process is called melting. The attractive forces between the water molecules weaken and individual molecules begin to move around each other, but they are still attracted to each other. Since liquid water molecules can move around, this state can take the shape of its container. The spacing of liquid water molecules per unit volume are actually smaller than it is for solid water, which means liquid water is more denser than solid water. Liquid water have no definite shape, however, has a definite volume.

Gas water

The third state of water is its gaseous state. In this state water molecules move freely and rapidly because they are not bound together. The change form liquid to vapour or gas is called vaporization, this process occurs at a temperature of 100 degrees Celsius. Gas water molecules have no definite shape, nor definite volume. Particles or atoms move randomly and are less attracted to each other. Gas water molecules are highly compressible.

Conclusion

Water exists in three forms or states. These include solid, liquid and gaseous states. Water is a liquid at room temperature, whereas it is a solid at temperatures below or equal to zero. When the water is heated up to 100 degrees Celsius, it turns to a gaseous state.

Answer:

Chemical weathering results in the breakdown of rock, while physical weathering does not.

Explanation:

When a substance such as ice, rushing water, wind, rapid heating or cooling, or plant growth exerts force on a rock, it breaks the rock physically or mechanically. Chemical weathering is the process by which a substance dissolves a rock, resulting in the rock's fragments falling away.

Answer for 2:

- KI: potassium iodide

- Fe2O3: diiron trioxide

- (NH4)3PO4: ammonium phosphate

Explanation for 2:

• KI,:

The compound KI is called potassium iodide, because it is a hydracid salt that has potassium in the positive parte (that's why it keeps the name of the metal). While the negative parte of the salt comes from the non-metal iodine.

• Fe2O3,:

The compound Fe2O3 is called

, because the molecule of this oxide has 3 oxygen atoms and 2 iron atoms.

• (NH4)3PO4:

The (NH4)3PO4 is a salt called ammonium phosphate, because it is formed from phosphoric acid (that gives the negative part of the salt), and ammonia (that gives the positive part of the salt). The negative part of salt ends in "...ate" because it comes from the acid that ends with the suffix "...ic".

Answer:

Ci

Explanation:

because it is an electron effective nuclear charge

Solutions :

We are given

• mass of potassium = 2.75 g

• Recall that 1 mole of potassium = 39.0983 grams

So , 2.75 g will represent

If 30.0 mL of 0.150 M CaCl2 is added to 22.0 mL of 0.100 M AgNO3 then  0.0022 moles AgNO3 will be precipitated.

The balanced chemical equation can be written as:

[tex]2AgNO_{3}[/tex] + [tex]CaCl_{2}[/tex] → 2AgCl + [tex]Ca(NO_{3} )_{2}[/tex]

Molecular Weight of CaCl2 = 110.98 g/mol

[tex]Ca(NO_{3} )_{2}[/tex] =170.01

AgCl = 143.45 g/mol

Volume of calcium chloride ([tex]CaCl_{2}[/tex] ) =30.0mL

1 ml = [tex]10^{-3}[/tex] L

So, 30 ml =0.03L

[tex]AgNO_{3}[/tex] = 22 mL= 0.022 L

1 ml = [tex]10^{-3}[/tex] L

So, 22 ml =0.022 L

By solving for the limiting reactant one needs to get the moles [tex]CaCl_{2}[/tex]and mols [tex]AgNO_{3}[/tex].

calcium chloride ( [tex]CaCl_{2}[/tex] )  = 0.150M(mol/L) × 0.03L = 0.0045 moles

Silver nitrate ([tex]AgNO_{3}[/tex] ) = 0.100M ×0.022L = 0.0022 moles

Since the stoichiometric ratio of Silver nitrate ( [tex]AgNO_{3}[/tex] ) to calcium chloride ( [tex]CaCl_{2}[/tex]) is 2:1

0.0022 mols [tex]AgNO_{3}[/tex] × (1 mol  [tex]CaCl_{2}[/tex] / [tex]AgNO_{3}[/tex] 2 mols ) = 0.00085 mols  [tex]CaCl_{2}[/tex] .

Therefore, 0.0022 moles [tex]AgNO_{3}[/tex] will be obtained.

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Surfactants are characterized to lower the surface tension between two liquids or between a liquid and a gas and so on.

You can see an example for detergents: the detergents are surfactants that lower the surface tension and that's because you can see that the dirt disperses easily and other substances, so the answer is false.

Answer:

Explanation:

Here, we want to get the molar volume of the gas

At STP, 1 mole of a gas occupies a volume 0f 22.4 dm^3

The conditions at STP are 273K