Patrick is a 16 year old boy whose body has stopped producing osteoclasts. What does this mean for his bones? What other parts of
his body will be affected by this?

ANSWER

The molecular geometry of XeF2 is linear

EXPLANATION:

The compound given is called Xenon Difluoride

It is very important to know the following features of Xenon

1. Xenon has two bond pairs and three lone pairs of electrons

2. During hybridization, Xenon will form two sigma bonds with two fluorine atoms

The bond angle of Xenon Difluoride is 180 degrees, hence, the molecular geometry is linear

Answer:

158 L.

Explanation:

What is given?

Pressure (P) = 1 atm.

Temperature (T) = 112 °C + 273 = 385 K.

Mass of methane CH4 (g) = 80.0 g.

Molar mass of methane CH4 = 16 g/mol.

R constant = 0.0821 L*atm/mol*K.

What do we need? Volume (V).

Step-by-step solution:

To solve this problem, we have to use ideal gas law: the ideal gas law is a single equation which relates the pressure, volume, temperature, and number of moles of an ideal gas. The formula is:

Where P is pressure, V is volume, n is the number of moles, R is the constant and T is temperature.

So, let's find the number of moles that are in 80.0 g of methane using its molar mass. This conversion is:

So, in this case, n=5.

Now, let's solve for 'V' and replace the given values in the ideal gas law equation:

The volume would be 158 L.

1. True ; an electrolyte is a substance that conducts electric current.

2. True ; a non eletrolyte, like sugar and ethanol, is a compound that doesnt conduct electic current .

3. True; An aqueous solution is a solution in which water is the solvent.

4. False; A solute is the substnce that dissolves in a solvent to produce a homogeneous mixture.

The concentration of NO−3 will be 1.99 M

NaNO3 ionizes as follows:  

NaNO3 ⇒ Na+ +  [tex]NO^{3-}[/tex]

Moles NaNO3 dissolved ⇒  (0.463 mol/L) /(0.885 L) =  0.5231 mol

From the chemical equation, one mole of NaNO3 dissolving yields one mole of  [tex]NO^{3-}[/tex]in solution.

Moles  [tex]NO^{3-}[/tex] = 0.5231 mol

Ca(NO3)2 dissolves as follows:

Ca(NO3)2 ⇒  Ca2+ + 2 [tex]NO^{3-}[/tex]

Moles Ca(NO3)2 dissolved ⇒  (0.787 mol/L)/ (0.731 mL) = 1.07 mol

From the chemical equation, one mole of Ca(NO3)2 dissolving yields two moles of  [tex]NO^{3-}[/tex] in solution.

Moles NO3^- = 1.07 molx 2 = 2.14mol  

Total moles  [tex]NO^{3-}[/tex]in solution=2.14 mol + 1.07 mol = 3.21 mol

Total volume of solution ⇒  0. 731 L + 0.885 L = 1.61 L  

Molarity of [tex]NO^{3-}[/tex]⇒ 3.21 mol / 1.61 L = 1.99 M

Therefore, concentration will be 1.99 M.

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So,

We could use the Charles law:

In this case, we have:

V1=122ml

T1=25°C

V2=50ml

T2=?

Let's replace these values in the equation in order to find T2:

The final temperature is about 10.2459°C.

In this question we have the concept of solutions and mixtures, let's analyze each option in order to find the one that best fits with reality:

A. Heterogeneous mixtures and solutions aren't the same thing, a mixture is when you have two or more compounds mixed together in a container, and a mixture can be heteregenous (which will form two or more phases), or homogeneous (which will be uniform throughout the mixture), and a solution will be the same as a homogeneous mixture.

B. A pure substance will not be separated by any method, since there is nothing the separate, it is all the same substance

C. As I said in letter A, a heteregeneous mixture will not have the same phase, but it will have different phases

D. The composition of a homogeneous mixture will be uniform, just a as a solution

The correct one will be letter D

Step 1

Water is supposed to be in the gas phase and it is assumed that it is an ideal gas.

Therefore, it can be applied:

p x V = n x R x T (1)

p = pressure = 6.32 atm

V = volume = 39.2 L

n = moles = unknown

R = gas constant = 0.082 atm L/mol K

T = absolute temperature = 486 °C + 273 = 759 K

-------------------

Step 2

n is cleared from (1):

p x V/R x T = n

(6.32 atm x 39.2 L)/(0.082 atm L/mol K x 759 K) = n

3.98 moles = n

Answer: number of moles = 3.98 moles

So,

Let's first convert some units:

So,

There's a reaction between 12.9g of sodium chloride and 250g of silver nitrate.

The reaction that occurs here, is the next one:

Sodium chloride reacts with silver nitrate to form silver chloride and sodium nitrate.

This reaction is a displacement reaction.

Now, let's complete the information:

Formula of Reactant A: NaCl

Grams of Reactant A: 12.9g

Formula of Reactant B: AgNO3

Grams of Reactant B: 250g

Formula of Product C: AgCl

Grams of Product C: ?

Formula of Product D: NaNO3

Grams of Product D: ?

We need to find the amount of grams of the formed products.

So, let's first convert the grams of each reactant in moles. Remember that the number of moles (n) can be found if we divide the given mass of the given compound by its molar mass. So,

The limiting reactant in this reaction is NaCl. So, we're going to use the reaction's stoichiometry to find the amount of the products as follows:

Thus, there are 31.53g of AgCl formed.

Finally, let's find the amount of grams of product D (NaNO3):

Therefore,

There were formed 31.53g of AgCl (product C) and 18.69g of NaNO3 (product D)

Explanation:

Propylamine is characterized by 3 carbons, 9 hydrogens, and 1 nitrogen.

According to the given picture, B is the correct answer.

Answer:

B is the correct answer.

Answer and explanation:

Atomic theory states that matter was made up of units called atoms, and that these were indivisibles.

The atomic theory began as a philosophical concept, that is, it was not based on reliable scientific explanations.

Answer

The millimeter is the smallest line (subdivision) on the meter stick.

This means the millimeter is the unit of the smallest reading that can be made without estimating.

Answer

Reduction

Procedure

A redox reaction is a reaction that involves the transfer of electrons between chemical species. During a redox reaction, some species undergo oxidation, or the loss of electrons, while others undergo reduction or the gain of electrons.

An atom’s oxidation number is the charge that the atom would have if all of the bonds to the atom were completely ionic. An increase in oxidation number during a reaction corresponds to oxidation, while a decrease corresponds to reduction.

In nature it is possible to find aqueous solutions of salts in both basic and acidic forms, for the basic salts, which can also be called Alkali salts, we have a few, for example, Sodium carbonate, Sodium sulfide, Sodium hydroxide. For the acidic salts we can have NaHSO4, Sodium bisulfate. Therefore this is a false statement.

Explanation:

The degree of amines is determined by the number of carbons attached to the nitrogen.

According to the given picture, the answer is A.

Answer:

The answer is A.

Answer:

I think that the most important thing that I've learned in the course was stoichiometry. I really liked balancing equations and calculating yields.

Answer

All the units were correct.

The unit of part b can either be any of milliliter or cubic centimeter

Density = 12446.71 g/mL

Explanation

All the units were correct.

Note:

1 milliliter = 1 cubic centimeter

g = grams

mL = milliLiter

The unit of part b can either be any of milliliter or cubic centimeter

The unit of the mass is g

The unit of the volume is mL

The unit of density is g/mL

The density of the solid = mass/volume = 87127/7 = 12446.71 g/mL

Firstly we will calculate the mass of the molecule by adding the together the atomic mass of each element:

Now we will determine the percentage mass of each of element:

Answer:

There needs to be 2 Na atoms and 1 O atom to form Na2O.

Explanation:

If you go to see the periodic table to review the oxidation states of elements, you can see that Na only has +1 as oxidation state, and O only has -2 as oxidation state.

The algebraic sum of these oxidation states in a neutral compound (not ions) must be zero, so let's apply the following technique to form the compound:

So the compound would be Na2O, so we need 2 atoms of Na, and 1 atom of O.

The answer would be: There needs to be 2 Na atoms and 1 O atom to form Na2O.

In this question, we need to calculate the percent mass concentration of one solute in one solvent, and we have:

178mg of C6H12O6

4.91g of H2O

To calculate the mass percent concentration, we can use the following formula:

%mass = (mass of solute/mass of solution)*100

But first, we need to have both compounds in the same unit, so 178mg will be equal to 0.178g

Now we add these values into the formula:

%mass = (0.178/5.088) * 100

mass = 3.50%

The 5.088 is because 4.91 + 0.178

Mia is a nanny for three small children their parents have laid out dinner, including broiled chicken tenders, broccoli, and steamed carrots when Mia puts the plates in front of them, one of the kids makes a face and announces, “I don’t eat broccoli!” then best way for Mia to respond is “Why don’t you at least take one bite?”

Here according to the given data mia is a nanny for three small children. their parents have laid out dinner, including broiled chicken tenders, broccoli, and steamed carrots when Mia puts the plates in front of them, one of the kids makes a face and announces, “I don’t eat broccoli!” then mia respond is “Why don’t you at least take one bite?” because mia is encouraging the small children to eat the broccoli because broccoli is the good for our health and it is packed with vitamins and minerals and it has a good source of calcium

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The absorbed or released by a system is given by the following formula:

Where Q is the heat absorbed or released, m is the mass of the system, Cp is the specific heat and ΔT is the change in the temperature.

Let mA and mB be the mass of objects A and B, let CpA and CpB be the specific heats of objects A and B and let ΔTA and ΔTB be the specific heats of objects A and B. We will have that:

If the same amount of heat is applied to both object, we will have that:

Replace mA and CpA for their equivalences in terms of mB and CpB:

It means that the change in temperature of A is 1/6 of the change of temperature of B.

The statement in its interaction with hemoglobin, oxygen is a prosthetic group is False (Option 4).

The hemoglobin protein of the red blood cells is a protein that binds to oxygen in order to transport this reactant of cellular respiration to all cells of the body.

Therefore, with this data, we can see that the hemoglobin protein of the red blood cells is required to bind oxygen which does not act as a prosthetic group and is a reactant of cellular respiration.

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Answer:862470.84

Explanation:

1 mole of substance is exactly equal to 6.023 × 10 ²³ molecules. 843.22 × 10²³ atoms are in 140 moles of Gold.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

1 mole is equal to 6.023 × 10 ²³ molecules.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

1 mole = 6.023 × 10²³ molecules ( Avogadro number )

Then 1 mole of gold = 6.023 × 10²³ molecules

140 moles of gold = 140 × 6.023 × 10²³

=  843.22 × 10²³ atoms

Thus, 843.22 × 10²³ atoms are in 140 moles of Gold.

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Step 1 - Finding the concentration in g/L

We know the density of the solution is 1.072 g/ml, which means there are 1.072 g in each ml of solution. This mass corresponds to both water and ethyleneglycol.

Since the percentage in mass of ethyleneglycol is 56%, we can calculate how much ethyleneglycol there is in 1 ml of solution:

The concentration of ethyleneglycol would be thus 0.6 g/ml.

To convert it to g/L, we just have to multiply it by 1000, because 1L = 1000ml:

The concentration of ethyleneglycol is this solution is thus 600 g/L.

Step 2 - Converting this concentration to mol/L

To convert now to mol/L (M), we just have to divide the concentration by the molar mass of ethyleneglycol (62.07 g/mol):

Note the concentration is a rather high one. We will have to dilute it.

Step 3 - Preparing a 0.350 M solution

We know the final volume of the solution must be 500 ml, and we also know its final concentration (0.350 M). Since we already know its inicial concentration as well, we can use the following formula for dilutions:

Plugging the values in the equation:

Step 4 - Describing how to prepare the solution

As we have calculated in step 3, we would need 18.11 ml of the original solution (9.66 M) for the dilution. We would then add water untill we get the final volume of 500 ml (add 481.89 ml of water)

The resulting solution would be a 500 ml solution of 0.350 M ethyleneglycol.

Motion can simply be defined as the change in position of a body while energy is the ability or capacity to work.

Mechanical energy is one of the forms of energy and is subdivided into potential energy and kinetic energy. These energies are energies that determine whether a body or an object is moving or not.

When a body is in a position, the energy possessed by such body by virtue of its position is known as potential energy while when a body is moving (in motion), the energy possesses by this body by virtue of its motion is the kinetic energy.

For instance, a ball rolling down an inclined plane is initially at rest at the top of the incline showing that the body has maximum potential energy and zero kinetic energy (since the body is in a position at this point).

As the ball rolls down the incline, it gains momentum and its kinetic energy keeps increasing along the plane while the potential energy keeps decreasing. Once the body gets to the bottom of the plane, the kinetic energy becomes zero while the potential energy is at maximum (because the body is at rest at this point as well).

To answer this question we have to use Charles' Law:

Before replacing for the given values, we have to convert the given temperatures to Kelvin:

Now replace for the given values, V1 and V2 are the initial and final volumes respectively and T1 and T2 are the initial and final temperatures. Solve for V1 and find its value:

It means that the initial volume was approximately 40mL.

The correct answer is c. 40.

The battery works by using electrochemical processes known as oxidation and reduction. Electrons are exchanged between chemical entities in these reactions. Oxidation occurs when a chemical species loses one or more electrons. The opposing process, electron gain, is known as reduction.

An oxidation process occurs at the positive electrode during discharge, whereas a reduction reaction occurs at the negative electrode. Electrons from an external power source induce a reverse electrochemical reaction in the rechargeable battery.

Calcium does not readily oxidize in dry air at normal temperatures, but it oxidizes fast in wet air or dry oxygen at around 300°C. Calcium interacts with fluorine at ambient temperature and with the other halogens at 400°C. Calcium is a great reducing agent and is extensively employed for this purpose.

Note that the question seems incomplete hence the general answer.

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First, we have the next data:

Q(t) = final mass at time t = 10 g

Qo = initial mass = 40 g

v = decay constan = 0.00043 1/years

This kind of process like decay, follow a first-order reaction, and the formula used for this:

Answer: t = 3224 years

a)

Hydrochloric acid: HCl

Sodium hydroxide: NaOH

In the neutralization, an acid and a base react to neutralize the H⁺ and OH⁻, forming water.

In a displacement reaction, an atom in one of the components is displaced to another component in the reaction.

In the case of HCl and NaOH, we can see this as a double displacement, where H⁺ from HCl is exchanged by the Na⁺ of the NaOH, forming NaCl and H₂O:

b)

Acetic acid: CH₃COOH

Sodium hydrocide: NaOH

In this case, the NaOH is the same. the Aceitc acid dissociates in the following way:

So, we just need to visualize the CH₃COO⁻ as the Cl⁻ of item a.

That is, we will have the reaction exchanging H⁺ and Na

Chemical reactions are reversible, which means that the reaction that occurs from the reactants to form products can be also from the products to form the reactants again, this is widely studied in Chemical Equilibrium and Le Chantelier's principleons are