Lithium nitride is an ionic compound. Draw a diagram which shows its formula, the charges on the ions and the arrangement of the valency (outer shell) electrons around the negative ion. Use x for an electron from a lithium atom and o for an electron from a nitrogen atom. ​

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 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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1.00147g of of cobalt-60 remain after 104.7 min if you start with 1024g.

According to nuclear decay [tex]N_{t} = N_{0 } e^[/tex]^-λt

for half-life ----[tex]t_{\frac{1}{2} }[/tex] =  0.693/λ

half-life of cobalt [tex]t_{\frac{1}{2} }[/tex] = 10.47

initial amount [tex]N_{0}[/tex] = 1024g.

t = 104.7 min

final product [tex]N_{t}[/tex] =?

[tex]t_{\frac{1}{2} }[/tex] = 0.69/λ   ( according to half-life)

10.47 = 0.693/λ

λ = 0.693/10.47 [tex]min^{-1}[/tex]

[tex]N_{t} = N_{0 } e^[/tex]^-λt

 [tex]N_{t}[/tex] = 1024[tex]\times e^{\frac{-0.693}{10.47} } \times 104.7 min[/tex]

[tex]N_{t}[/tex] = 1024 g[tex]\times e^{-6.93}[/tex]

[tex]N_{t}[/tex] = 1.00147g

Half-life is the time it takes for a quantity to decrease to half its original value. This term is often used in nuclear physics to describe how quickly unstable atoms decay radioactively or how long stable atoms last. The term is also used more generally to describe any type of exponential decay.

The half-life of a radioactive isotope is the  time required for half of the radioactive isotope to decay. The half-life of a given radioactive isotope is constant. it is unaffected by conditions and is independent of the initial amount of that isotope.

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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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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.

Answer:

the answer is A since the foot is printed

Answer:

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

STP stands for Standard Temperature and Pressure. Nowadays the STP is temperature of 0°C (273.15K) and pressure of 1 bar.

Assuming the gas behaves as an ideal gas, in these conditions the volume of each mol of gas is approximately 22.7 L.

Using rule of three, we can calculate the volume of 0.001 mol of H₂S:

Volume --- Number of moles

x --- 0.001 mol

22.7L --- 1 mol

So, the volume is approximately 0.0227 L.

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.

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.

The name for MgBr2 is Magnesium bromide

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

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.

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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The change in the temperature of the gas, given that the volume is held constant is 63 °C

Let's begin by obtaining the new temperature of the gas. This can be obtained as follow:

P₁ / T₁ = P₂ / T₂

4.62 / 300 = 5.59 / T₂

Cross multiply

4.62 × T₂ = 300 × 5.59

Divide both side by 4.62

T₂ = (300 × 5.59) / 4.62

T₂ = 363 K

Subtract 273 to obtain answer in °C

T₂ = 363 – 273 K

T₂ = 90 °C

Finally, we shall determine the change in the temperature. This is illustrated below:

ΔT = T₂ – T₁

ΔT = 90 – 27

ΔT = 63 °C

The, the change in the temperature is 63 °C

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Complete question:

See attactched photo

In this question, we have a gas presenting volume and pressure, and the gas law that we can use to calculate it is Boyle's gas Law, which perfectly correlates both pressure and volume, the formula is:

P1V1 = P2V2

We have:

P1 = 27.5 atm

V1 = 103.4 L

P2 = 69.3 atm

V2 = ?

Now we add these values into the formula:

27.5 * 103.4 = 69.3 * V2

V2 = 41.0 L

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:

Explanation:

To write the Lewis structure, it is important to look for the electrons of each atom in the Periodic Table of Elements.

C has 4 valence atoms, H has 1 valence atom and Cl has 7 valence atoms.

We write the C atom in the center. Then we have to complete the Octet in each atom, except in Hydrogen, because it can only has 2 electrons bonded.

Answer: The oxidation states can be labelled as:

- In Fe2O3: Fe = +3, O = -2

- In CO: C = +2, O = -2

- In Fe: Fe = 0

- In CO2: C = +4, O = -2

Fe is being reduced (changes from +3 to 0) and C is being oxidized (changes from +2 to +4).

Explanation:

The question requires us to label the oxidation states of each element in the following chemical equation, and then determine which one is being oxidized and which one is being reduced.

To solve this problem, we need to keep in mind a few points:

- oxidation occurs when its oxidation number increases (the element "loses" an electron);

- reduction occurs when its oxidation number decreases (the element "gains" an additional electron);

- the oxidation number of some elements is usually the same; a good example is oxygen (O): in most cases, O presentes oxidation number equals to -2.

Next, let's analyze the oxidation numbers of the elements in the reaction:

- Fe2O3: since O has oxidation number = -2, in the compound Fe2O3 the total charge brought by O is (-2) * 3 = -6, thus 3 atoms of Fe must have charge +6. We can say Fe has oxidation number = +3 in Fe2O3 (because (+3) * 2 + (-2) * 3 = 0).

- CO: O has oxidation number = - 2, thus C must present oxidation number = +2 in CO.

- Fe: Elementar Fe presents oxidation number = 0;

- CO2: Since O has oxidation number = -2, C must present oxidation number = +4 (because (+4) * 1 + (*2( * 2 = 0.

Thus, the oxidation states can be labelled as:

- In Fe2O3: Fe = +3, O = -2

- In CO: C = +2, O = -2

- In Fe: Fe = 0

- In CO2: C = +4, O = -2

Analyzing the oxidation states in the reactants (left side) and products (right side), we can see that Fe goes from +3 to 0, thus it is being reduced, while C goes from +2 to +4, thus it is being oxidized.

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

b) firstly we nee dto understant that 1 ton = 2831.68 litres

therefore if 16 967.04 Litres needs transporting we simply divide the 16 967.04 by 2831.68 and the answer is 5.99 which is rounded of to 6. therefore 6 trucks will be needed

c) we need to first find out how many gallons of fuels will be needed to complete a 285 mile distance. so we divide 285 by 7.8 to get 36.54 gallons and we know the price of i gallon to be $3.95 therefoe the cost will be

3.95 x 36.54 = 144.33

the cost is $144.33 per day

Answer:

Ci

Explanation:

because it is an electron effective nuclear charge

EXPLANATION:

Homologous series can be defined as a sequence of compounds with the same functional group and similar chemical properties in which the members of the series differ by -CH2. The homologous series the chemical properties of the element.

Below are the characteristics of the homologous series

1. The members of the homologous series have the same functional group

2. The members of the homologous series have a general method of preparation

3. The members of the homologous series differ by -CH2

4. The members of the homologous series have the same chemical properties.

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".

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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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

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).

Answer:

0.999

Explanation: divide by 10

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.

Theoretical yield is calculated based on the stoichiometry of the chemical equation. First, we have to find the number of moles of each reactant using the molar mass of each of them. You can find the molar mass using the periodic table: the molar mass of aluminum (Al) is 26.98 g/mol and the molar mass of chlorine gas (Cl2) is 70.8 g/mol:

The next step is to find how many moles of AlCl3 are produced by each reactant. You can see that in the chemical equation, 2 moles of Al produces 2 moles of AlCl3:

And 3 moles of Cl2 produces 2 moles of AlCl3:

You can realize that the maximum, amount of moles that are produced of AlCl3 is 0.367 moles because Cl2 would be the limiting reactant and there is an excess of Al. For this value, we have to find its mass using the molar mass of AlCl3 which is 133.2 g/mol:

The answer would be that the theoretical yield of AlCl3 is 48.88 g.