"Calculate the amount of energy it will take to change 20.0 Grams of Water from -3 C to changing it all to vapor at sea level. Show all your work for credit."

Please show work! Would really appreciate it, last assignment for Chemistry >

D could be a answer

Answer:

carbon dioxide

Explanation:

the rest are mixtures

A chemical substance is composed of one type of atom or molecule.

The answer for your question is the first one

The moon accelerates because it is continuously increasing its speed of orbit

Change in temperature affects the rate of reaction since it causes a change in the number of collisions per unit time.  These collisions cause the breaking of bonds and formation of new ones  giving out new products. An increase in temperature increases the rate of collisions hence increasing the rate of reaction while a decrease in temperature leads to a decrease in the rate of reaction due to the decreased number of collisions per unit time. thus the correct choice for blank A is: B. the number of collisions between molecules and for blank B: decrease.

Answer:

A decrease in temperature changes "the number of collisions between molecules. The reaction rate will decrease.

Blank A: "the number of collisions between molecules.

Blank B: decrease.

An increase in temperature causes a rise in the energy levels of the molecules involved in the reaction, so the rate of the reaction increases. Similarly, the rate of reaction will decrease with a decrease in temperature.

Answer : Carbon atoms form 4 bonds with other atoms by sharing valence electrons in order to attain a stable configuration.

Explanation :

The given element is, Carbon

The element carbon with symbol (C) having the atomic number 6 and the atomic mass 12.

The number of electrons in carbon atom is, 6

The electronic configuration of carbon will be, [tex]1s^22s^22p^2[/tex]

The number of valence electrons in carbon atom = 2 + 2 = 4

That means carbon atom have the ability to form four bonds with the other atoms by the sharing of four valence electrons in order to achieve a stable electronic configuration.

For example : Carbon atom share their four valence electrons with four hydrogen atoms that has one valence electron to form a methane molecule, [tex]CH_4[/tex] and carbon and hydrogen are bonded by the covalent bond.

Carbon atoms form 4 bonds with other atoms by sharing valence electrons in order to attain a stable configuration.

Each element has a given "electronic configuration", in its ground state, and elements with similar external electronic configurations behave similarly in many respects.

The main characteristic of the carbon atom is concatenation, that is, the ability to bond or unite with itself, forming large chains or very stable rings.

Therefore, we can conclude that carbon atoms form 4 bonds with other atoms by sharing valence electrons in order to attain a stable configuration.

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cellular respiratory.

Hope that helps! :)

Your body cells use the oxygen you breathe to get energy from the food you eat. This process is called cellular respiration. During cellular respiration the cell uses oxygen to break down sugar. Breaking down sugar produces the energy your body needs.

Answer:

1249.88 mol.

Explanation:

∵ no. of moles of Fe = mass of Fe/atomic weight of Fe.

∴ no. of moles of Fe = (6.98 x 10⁴ g)/(55.845 g/mol) = 1249.88 mol.

Answer:

Polar , bent , polar

An SCl2 molecule has polar bonds and a bent molecular shape. As a result, an SCl2 molecule is polar.

Explanation:

The correct blanks for 1, 2 and 3 are polar bonds, bent molecular shape and polar respectively.

An [tex]SCl_2[/tex] molecule has 1. polar bonds and a 2. bent molecular shape. As a result, an SCl2 molecule is 3. polar. In [tex]SCl_2[/tex], the sulfur (S) and chlorine (Cl) atoms form double bonds. Because chlorine is more electronegative than sulfur, resulting in an unequal distribution of electron density, the S–Cl bonds in[tex]SCl_2[/tex]  are polar. [tex]SCl_2[/tex] has a bent or V-shaped molecular shape. On sulfur, which has a lone pair of electrons and two bond pairs, the repulsion between these electron pairs leads the molecule to a bent shape.

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1. First calculate the total molar mass of the entire compound.

Mg = 3 x 24.31 = 72.93 g/mol

P = 2 x 30.97 = 61.94 g/mol

O = 8 x 16.00 = 128.00 g/mol

* Add them up;

72.93 + 61.94 + 128.00 = 262.87 g/mol

2. Take the individual masses of each element that you calculated, divide them by the total mass (262.87 g/mol) and then multiply by 100.

Mg = 72.93/262.87 = 0.2774 x 100 = 27.74%

P = 61.94/262.87 = 0.2356 x 100 = 23.56%

O = 128.00/262.87 = .4870 x 100 = 48.70%

3. All of the percentages should add up to equal 100%.

* Hope this helps

1. Firstly we have to calculate the total molar mass of the entire compound.

2. Now we have to Take the individual masses of each element that you calculated, then divide them by the total mass (262.87 g/mol), and also then multiply by 100.

3. Thus All of the percentages should add up to equal 100%.

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ΔH° = -851.5 kJ/mol given that

[tex]\begin{array}{cc}\textbf{Species}&{\bf {\Delta H_f\textdegree{}}}\\ \text{Fe}_2\text{O}_3\;(s) & -824.2\;\text{kJ}\cdot\text{mol}^{-1}\\\text{Al}_2\text{O}_3\;(s) & -1675.7\;\text{kJ}\cdot\text{mol}^{-1}\end{array}[/tex]

(Source: Chemistry Libretexts.)

Refer to a thermodynamic data table for the standard enthalpy of formation for each species.

Don't be alerted if the data for Al (s) and Fe (s) are missing. Why?

As a result, [tex]\Delta H_f\textdegree{} = 0[/tex] for both Al (s) and Fe (s).

[tex]\displaystyle \Delta H_{\text{rxn}}\textdegree{} = \text{Sum of }\Delta H\text{ for all }\textbf{Product} - \text{Sum of }\Delta H\text{ for all }\textbf{Reactant}}\\\phantom{\Delta H_{\text{rxn}}\textdegree{}} = (1\times \Delta H_f\textdegree{}(\text{Al}_2\text{O}_3\;(s)) + 1\times \Delta H_f\textdegree{}(\text{Al}\;(s)) \\ \phantom{\Delta H_{\text{rxn}}\textdegree{}=}-(1\times \Delta H_f\textdegree{}(\text{Fe}_2\text{O}_3\;(s)) + 1\times\Delta H_f\textdegree{}(\text{Fe}\;(s))[/tex]

[tex]\Delta H_{\text{rxn}}\textdegree{}} = (1 \times (-1675.7)) - (1\times(-824.2)) = -851.5\;\text{kJ}\cdot\text{mol}^{-1}[/tex].

The number "1" here emphasizes that in case there are more than one mole of any species in one mole of the reaction, it will be necessary to multiply the [tex]\Delta H_f\textdegree{}[/tex] of that species with its coefficient in the equation.

Molarity's formula is known as: Molarity(M)=moles of solute/liters solution.

In this case we are already given moles and liters so you just have to plug the numbers into the equation.

0.400 mol HCL/9.79L solution=0.040858M

If you were to use scientific notation, the answer will be: 4.1*10^-2, but otherwise, you can just use the decimals above and round appropriately as you see fit.

Final answer:

To calculate the molarity of a solution with 0.400 mol of HCl in 9.79 L, divide the moles by the volume, resulting in a molarity of 0.0409 M.

Explanation:

The question asks how to calculate the molarity of a hydrochloric acid (HCl) solution. Given that the solution contains 0.400 mol of HCl and has a total volume of 9.79 liters, we can use the definition of molarity. Molarity is defined as the number of moles of solute (in this case, HCl) divided by the volume of the solution in liters.

To find the molarity, we perform the following calculation:

Molarity = moles of solute / liters of solution
Molarity = 0.400 mol / 9.79 L

This gives us a molarity of:

0.0409 M

Therefore, the molarity of the HCl solution is 0.0409 M.

Answer:

34.33 %.

Explanation:

W% = [(W of solute NaF)/(W of solution)] x 100.

W of solute NaF = 65.4 g.

W of solution = W of solute NaF + W of water = 65.4 g + 125.1 g = 190.5 g.

∴ W% = [(W of solute NaF)/(W of solution)] x 100 = [(65.4 g)/(190.5 g)] x 100 = 34.33 %.

Answer: the answer is letter c. melting

Answer:

C melting

Explanation: we can eliminate 2 right off the bat eroison and weathering you can eliminate them because their above ground and subsurface means below the surface. You eliminate cementing because it wants in the deeper section of the earth.

The answer is C because it is between nonmetals

The Answer Is D. Have A Great Day

A salt is best described as a compound that is formed from the reaction between an acid and a base.

Answer:

Reaction between acid and base is called as neutralization and forms salt and water.

Example, Sodium hydroxide reacts with HCl gives salt NaCl and water as below

NaOH + HCl------.> NaCl + H2O

Answer:

162.0 g.

Explanation:

The solubility of NaNO₃ in 100.0 g of water at 10.0°C is 81.0 g/ 100 g water.

Using cross multiplication:

81.0 g of NaNO₃ form saturated solution at 10.0°C in → 100.0 g of water.

???? g of NaNO₃ form saturated solution at 10.0°C in → 200.0 g of water.

∴ The grams of NaNO₃ form saturated solution at 10.0°C in 200.0 g of water = (81.0 g)(200.0 g)/(100.0 g) = 162.0 g.

Answer:

I belive it would be 162.0 grams

Explanation:

321.8 g CaF2

321.5 g Al2(CO3)3

The equation for the reaction is;  

3 CaCO3 + 2 AlF3 → 3 CaF2 + Al2(CO3)3  

Number of moles of CaCO3 will be;

=(412.5 g CaCO3) / (100.0875 g CaCO3/mol)

= 4.12139 mol CaCO3  

Number of moles of AlF3 will be;

= (521.9 g AlF3) / ( 83.9767 g AlF3/mol)

= 6.21482 mol AlF3

But;

4.12139 moles of CaCO3 would react completely with 4.12139 x (2/3) = 2.74759 moles of AlF3.

Thus; there is more AlF3 present than that, so AlF3 is in excess, and CaCO3 is the limiting reactant.  

Therefore;

Mass of CaF2 will be;

(4.12139 mol CaCO3) x (3/3) x (78.0752 g CaF2/mol) = 321.8 g CaF2  

Mass of Al2(CO3)3 on the other hand will be;

(4.12139 mol CaCO3) x (1/3) x (233.9903 g Al2(CO3)3/mol) = 321.5 g Al2(CO3)3

When 412.5 g of calcium carbonate reacts with 521.9 g of aluminum fluoride, approximately 322.1 g of CaF₂ and 345.5 g of Al₂(CO₃)₃ can be produced.

The reaction is:

CaCO₃ + AlF₃ → CaF₂ + Al₂(CO₃)₃

First, let's write the balanced equation:

3CaCO₃ + 2AlF₃ → 3CaF₂ + Al₂(CO₃)₃

Now, let's calculate the number of moles of each reactant:

n(CaCO₃) = 412.5 g / 100.09 g/mol = 4.12 mol n(AlF₃) = 521.9 g / 83.98 g/mol = 6.22 mol

Since the reaction requires 3 moles of CaCO₃ for every 2 moles of AlF₃, the limiting reactant is CaCO₃.

Now, let's calculate the number of moles of each product:

n(CaF₂) = 4.12 mol (CaCO₃) × (3 mol CaF₂ / 3 mol CaCO₃) = 4.12 mol n(Al₂(CO₃)₃) = 4.12 mol (CaCO₃) × (1 mol Al₂(CO₃)₃ / 3 mol CaCO₃) = 1.37 mol

Finally, let's calculate the mass of each product:

m(CaF₂) = 4.12 mol × 78.07 g/mol = 322.1 g m(Al₂(CO₃)₃) = 1.37 mol × 258.99 g/mol = 354.5 g

So, 322.1 g of CaF₂ and 354.5 g of Al₂(CO₃)₃ can be produced.

Answer:

  $1.08/lb

Explanation:

You want the cost in dollars per pound of grapes that cost €1.75 per kg, given the exchange rate €1 = $1.36.

We can multiply by a ratio that cancels units we don't want and leaves units we do want.

  [tex]\dfrac{1.75 \text{ euro}}{1\text{ kg}}\times\dfrac{0.454\text{ kg}}{1\text{ lb}}\times\dfrac{\$1.36}{1\text{ euro}}\approx\boxed{\$1.08\text{ per lb}}[/tex]

Q=mc*temperature change

400=5.6/1000*c*(87-23)

c=1160.07J/kg/k

The formula for GPE is PE=mgh, where “m” is the mass of the object, “g” is the acceleration due to gravity (~9.8 m/s^2 on Earth’s surface), and “h” is the height of the object from the ground. Therefore,

PE=mgh

PE=(6 kg)(9.8 m/s^2)(1 m)

PE=58.8 kg•m^2/s^2 or 58.8 Newtons

The GPE of the bowling ball under these conditions would be about 59 Newtons.

Hope this helps!

A.  The United States can produce enough food to feed all the people in the world. is your best answer, and is the only logical answer.

It is the only answer that actually has the word "food" in it, and is a direct result of farming technological advances.

~

It is the atomic number. So it is D.

Strontium atom loses 2 electrons to become an ion with 2 electrons lesser than its atom. Your answer is C.

Molarity's formula is: moles solute/liters solution.

In this question, we are given grams of solute so we have to convert that to moles.

NaNO3 has a molar mass of 84.9947g/mol. Here we begin with the given 212.5g and multiplying it by 1mol/84.9947g because the grams have to cancel out to give moles.

[tex](212.5 grams NaNO3)/(\frac{1 mole NaNO3}{84.9947 grams NaNO3} ) =2.5 moles NaNO3[/tex]

Now that we have moles of solute, we just plug it into the formula.

2.5 mols NaNO3/3L solution=0.8333 M of solution

The molarity of the solution containing 212.5 g of NaNO₃ in 3 L of solution is 0.83 M

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Mole = mass / molar mass

Mole of NaNO₃ = 212.5 / 85

Mole of NaNO₃ = 2.5 mole

Molarity = mole / Volume

Molarity = 2.5 / 3

Molarity = 0.83 M

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When you ride a bicycle, several things happen that require energy and it's transformation. You pedaling the bike is transforming chemical energy, supplied by the breakdown of the food you eat, into mechanical energy to turn the pedals. The chemical energy is potential and the mechanical energy is kinetic.

Answer: Option (C) is the correct answer.

Explanation:

A property that does not cause any difference in the chemical composition of the atom is known as a physical property.

For example, boiling point, mass, density, melting point, solubility etc are physical properties.

On the other hand, a property that that cause difference in the chemical composition of a substance is known as a chemical property.

For example, combustion, toxicity, flammability etc are chemical properties.

Therefore, we can conclude that out of the given options solubility is a physical property.

Solubility out of the following is a physical property. Therefore, the correct option is option C.

A physical property is a characteristic that does not alter the chemical makeup of an atom in any way. Physical attributes include things like melting point, solubility, mass, density, and boiling point. At the other hand, a chemical property is a characteristic that alters a substance's chemical make-up. Chemical attributes include things like combustion, toxicity, flammability, etc. Solubility out of the following is a physical property.

Therefore, the correct option is option C among all the given options.

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Answer:

0.00479099293329 g

Explanation:

physical change because it is just changing the state of matter. SOLID into LIQUID

For ideal gas, there is no attraction between its molecules. But for real gas molecules, there are attractive forces in between molecules. Those are called Van der Waals forces.

To determine which gas particles are more strongly attracted to each other, you can compare two different gases at constant pressure but different temperatures.  Because of the Van der Waals forces, the increase in volume due to temperature will be smaller than what is predicted by the ideal gas law.  The larger the difference from the ideal gas law's prediction, the larger the intermolecular attractive force is.

Answer:

Explanation:

another way to look at it - for gases within the same group, the larger the attractive force, the closer the gas molecules can get together; i.e. the higher the gas density.

for example, for Group VII Halogens gases, the further down the gas, the higher its gas density: I2 > Br2 > Cl2 > F2. The Van der Waal force is also dependent on the gas masses. That means higher gas density indicates stronger attractive force.