the Na2O valence is
​

It would be A since a balanced force would stay the same.

Answer:

[tex]m=421.2g[/tex]

Explanation:

Hello.

In this case, we first compute the volume of the pool via:

[tex]V=L*W*H\\\\V=26m*4m*2.5m\\\\V=260m^3[/tex]

Then, since the density is defined as the mass divided by the volume, we compute the mass as follows:

[tex]\rho=\frac{m}{V}\\ \\m=\rho*V\\\\m=1.62g/m^3*260m^3\\\\m=421.2g[/tex]

Best regards.

The given example is a good description of the phenomena is:

Anorexia is an eating disorder which makes a person to feel that any extra food is going to cause him to become obese and because of this, he would reduce his intake of food.

As a result of this, they tend to get some health issues as a result of their refusal to eat certain foods or even eat at all. This is evident in the given example of John refusing to eat an extra slice of cake after having a huge meal at his favorite restaurant.

Therefore, the correct answer is option D

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Answer:

See attached picture and explanation.

Explanation:

Hello!

In this case, given the instruction on the molecule, we can infer that A is the central atom as it must have a full octet which is reached via one bond with each B atom. Moreover, via a double bond with C, both A and C are able to have the required full octet as shown on the attached picture.

For the name, it looks like the formaldehyde ([tex]CH_2O[/tex]) which has two single-bonded hydrogen atoms and one double-bonded oxygen atom in order to have a full octet forth both carbon and oxygen.

Regards.

Answer:

hmm:

Explanation:

Unless I am crazy, there should be an image attached to this. But, you can use this formula:

[tex]F = G\frac{m_1m_2}{r^2}[/tex] where F is the force, G is a constant, m1 and m2 are the masses of the objects, and r is the distance between the objects.

Answer:

fractional distillation

Explanation:

Answer:

This is a chemistry problem i'm having some issues with. I have a test tomorrow and need all the help I can get.

What I thought to do was first figure out the atoms of 57.0g F, which I got 2x10^24.

Then I tried to convert it into grams Co.

Would I just divide it by 6.022x10^23 and then multiply by the molar mass of Co?

Is the answer 195.7g?

Thanks!

Explanation:

The mass of Cobalt that contains the same number of atoms in 57 g of fluorine is 177 g

We'll begin by calculating the number atoms in 57 g of fluorine. This can be obtained as follow:

From Avogadro's hypothesis,

1 mole of F = 6.02×10²³ atoms

But,

1 mole of F = 19 g

Thus,

19 g of F = 6.02×10²³ atoms

Therefore,

57 g of F = [tex]\frac{57 * 6.02*10^{23} }{19}\\\\[/tex]

57 g of F = 1.806×10²⁴ atoms

Finally, we shall determine the mass of Cobalt that contains 1.806×10²⁴ atoms. This can be obtained:

From Avogadro's hypothesis,

6.02*10²³ atoms = 59 g of Co

Therefore,

1.806×10²⁴ atoms = [tex]\frac{59 * 1.806 *10^{24} }{6.02*10^{23} }\\\\[/tex]

1.806×10²⁴ atoms = 177 g of Co

Thus, we can conclude that 177 g of Cobalt (Co) contains the same number of atoms in 57 g of fluorine

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Answer:

A

Explanation:

Classify objects in space

Answer:

its A

Explanation:

just did it

Answer:

50

Explanation:

so you'll have to apply Newton's 2nd law which is F=ma and then substitute the values that you already have in the question as in, the force is 200 and you'll have to find the acceleration by working it out which is 4m/s² and then find the mass by dividing 200 by 4 so the actual mass is 50kg ✌️❤️

Taking into account the Newton's second law, the mass of the cart is 50 kg.

You have to know that Newton's second law states that this force will change the speed of an object because the speed and / or direction will change. These changes in velocity are called acceleration.

So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object.

Mathematically, Newton's second law is expressed as:

F= m×a

where:

Acceleration relates the changes in velocity with the time in which they occur. So:

[tex]a=\frac{final velocity - initial velocity}{time}[/tex]

In this case:

Replacing in the expression for Newton's Second Law:

200 N= m× 4 m/s²

Solving:

m= 200 N÷4 m/s²

m= 50 kg

Finally, the mass of the cart is 50 kg.

Learn more about the Newton's second law:

Answer:

The distance the truck traveled is 190

Explanation:

I added 30, 45, 50, 65 together to get the total distance

Answer:

The chemical formula is Cr(BrO3)3.

The chemical formula formed between chromium (III) and bromate ion is Cr(BrO3)2.

A chemical formula is an formula for the atoms in compound which are arranged in a fixed proportion.

The chemical formula of salt is NaCl. The chemical formula of sodium bicarbonate is NaHCO3. The chemical formula of chromium bromate is Cr(BrO3)2.

The molecular mass of chromium bromate is 435. 7027. The valency of chromium in chromate ion is 2. The atomic number of chromium is 24. The atomic number of bromine is 35. Bromine contain seven valence electrons.

Therefore, The chemical formula formed between chromium (III) and bromate ion is Cr(BrO3)2.

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Answer:

-9+6-(-2)

-9+6+2

-9+8

-1 is the answer

Explanation:

Answer:

Density = 50 / 20 = 2.5 gram/ cm^3

Explanation:

Answer is 2.5 grams/ cm^3

Grinding of glass sanding of wood are physical changes. Rusting of iron and burning candle are chemical changes.

Chemical changes involves the formation or breaking of chemical bonds that leads to a new product. Whereas, physical changes does not involves any change in chemical bonds. Phase change, change in size, shape etc. are physical changes.

Grinding glass will does not make any change in chemical bonds of glass materials . Just their size gets reduces and forms their dust particles. Thus, it is a physical change. Sanding the wood also a physical change.

Rusting of iron is the formation of red iron oxide by the reaction of iron with oxygen from air or water. This oxide will spread over the surface of the metal and eventually gets corroded. This is a chemical change where a new product is formed.

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Answer:

A Intrusive

Explanation:

I go to K12 and they say that's the answer

Answer:

C

Explanation: I mL = 1 cm3 and 1 L = 1000 mL so 1 L - 1000 cm3

Answer:

d

Explanation:

Answer:

electrical energy is converted into mechanical energy.

Explanation:

An electric motor contains a permanent magnet and an electromagnet. As the poles of the electromagnet and the permanent magnet constantly repel each other, the electric motor makes a rotational motion. The increase in current or the increase in power of the magnet causes the electric motor to rotate faster.

Answer:

c

Explanation:

Physical Weathering is process that occurs when repeated freezing and thawing breaks apart rocks

Answer:

40

Explanation:

120/30=40

Answer: 3.4 atoms

Explanation: hope this helps you!!

Answer:

0.4774 KJ/K.mol

Explanation:

We are told that the transition at 25.0°C occurs in three steps. Steps i, ii and iii.

Thus;

the entropy of unfolding of lysozyme = ΔS_i + ΔS_ii + ΔS_iii

Now,

C_p,m(unfolded protein) = C_p,m(folded protein) + 6.28 kJ/K.mol

Now, for the first process, ΔS_i is given as;

ΔS_i = C_p,m × In(T2/T1)

We are given;

T1 = 25°C = 25 + 273.15K = 298.15 K

T2 = 75.5°C = 75.5 + 273.15 K=348.65 K

Thus;

ΔS_i = C_p,m × In(348.65/298.15)

Now, for the third process, ΔS_iii is given as;

ΔS_iii = (C_p,m + 6.28 kJ/K.mol) × In(T1/T2)

Thus;

ΔS_iii = (C_p,m + 6.28 kJ/K.mol) × In(298.15/348.65)

Now, we don't know C_pm. So, we have to find a way to eliminate it. We will do it by rewriting In(298.15/348.65) in such a way that when ΔS_iii is added to ΔS_i, C_p,m will cancel out. Thus;

In(298.15/348.65) can also be written as;

In(348.65/298.15)^(-1) or

- In(348.65/298.15)

Thus;

ΔS_iii = - [(C_p,m + 6.28 kJ/K.mol) × In(298.15/348.65)]

Now, let's add ΔS_iii to ΔS_i to get;

ΔS_i + ΔS_iii = [C_p,m × In(348.65/298.15)] + [(-C_p,m - 6.28 kJ/K.mol) × In(348.65/298.15)]

ΔS_i + ΔS_iii = [C_p,m × In(348.65/298.15)] - [C_p,m × In(348.65/298.15)] - [6.28In(348.65/298.15)]

First 2 terms will cancel out to give;

ΔS_i + ΔS_iii = -6.28In(348.65/298.15)

ΔS_i + ΔS_iii = -0.9826 KJ/K.mol

Now,for process ii;

ΔS_ii = standard enthalpy of transition/Transition Temperature

Thus;

ΔS_ii = (509 KJ/K.mol)/348.65

ΔS_ii = 1.46 KJ/K.mol

Thus;

the entropy of unfolding of lysozyme = ΔS_i + ΔS_ii + ΔS_iii = -0.9826 + 1.46 = 0.4774 KJ/K.mol

Answer:80%

Explanation:Total C in terrestrial ecosystems is approximately 3170 gigatons (GT; 1 GT = 1 petagram = 1 billion metric tons). Of this amount, nearly 80% (2500 GT) is found in soil (Lal 2008).

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of copper = 2.62 cm³

density = 8.96 g/cm³

We have

mass = 8.96 × 2.62 = 23.4752

We have the final answer as

Hope this helps you

Answer:

See attached picture.

Explanation:

Hello.

In this case, since the synthesis of amides via anhydride requires its reaction with the N-radical primary amine, as it is required to yield N-methylpropanamide, the reactants must be propanoic anhydride and methylamine in order to yield the aforementioned amide as well as propanoic acid as a side product.

This reaction is shown on the attached picture.

Best regards.

Answer:

less than 45 cm, as the ball transforms some of its potential eneregy to termal energy and sound energy

Answer:

A. 1691.04 g

B. 19.23 mL

Explanation:

The following data were obtained from the question:

Density of bromine = 3.12 g/mL.

A. Determination of the mass of bromine.

Density of bromine = 3.12 g/mL.

Volume of bromine = 542 mL

Mass of bromine =?

Density = mass /volume

3.12 = mass /542

Cross multiply

Mass of bromine = 3.12 × 542

Mass of bromine = 1691.04 g

B. Determination of of volume of bromine.

Density of bromine = 3.12 g/mL.

Mass of bromine = 60 g

Volume of bromine =...?

Density = mass /volume

3.12 = 60 / volume

Cross multiply

3.12 × volume = 60

Divide both side by 3.12

Volume of bromine = 60/3.12

Volume of bromine = 19.23 mL.

The answer to both solution is as follows:-

All the data is given in the question,

The formula we will use is as follows:- [tex]Density = \frac{mass}{volume}[/tex]

[tex]Mass of bromine = 3.12 * 542[/tex]  = 1691.04 g

Hence, the mass of the bromine is 1691.04g

The volume of bromine = [tex]\frac{60}{3.12}[/tex]

The volume of bromine is 19.23mL.

Hence, the mass and the volume are 1691.4g and 19.23ml.

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Answer:

If the prime factors of a number are grouped in triples of equal factors, then that number is called a perfect cube. In order to check whether a number is a perfect cube or not, we find its prime factors and group together triplets of the prime factors. If no factor is left out then the number is a perfect cube.

Explanation:

Answer:

Explanation:

Given that;

The chemical equation for the reaction is:

[tex]\text {4NH}_3(g) +\text {5O}_2(g) }[/tex] ↔ [tex]\text {4NO}(g) +\text {6H}_2O}(g) }[/tex]

a). [tex]\Delta H^0 = \sum \Delta H^0_{reactant \ bonds \ broken} + \sum \Delta H^0_{product \ bonds \ formed}[/tex]

Using average bond energies;

For Bonds broken, we have:

4 × 3 N - H = 12 mol × 391 kJ/mol = 4692 kJ

5 × O = O = 5 mol × 498   kJ/mol =  2490 kJ    

         [tex]\mathbf{ \sum \Delta H^0_{reactant \ bonds \ broken} }[/tex]   = 7182  kJ

For Bonds formed, we have:

4 × N = O = 4 mol × - 607 kJ/mol = -2428 kJ

6 × 2 O - H = 12 mol × - 467 kJ/mol = - 5604 kJ

         [tex]\mathbf{ \sum \Delta H^0_{product \ bonds \ formed} }[/tex]      = - 8032 kJ

Therefore;

[tex]\mathbf{ \Delta H^o = 7182 kJ + (- 8032 \ kJ)}[/tex]

[tex]\mathbf{ \Delta H^o =-850 \ kJ}[/tex]

b) Using Standard heats of formation;

[tex]\Delta H^0 = \sum m \Delta H^0_f (products) = \sum n \Delta H^0_f (reactants)[/tex]

[tex]\Delta H^0 = [ 4 \ mol \times \Delta H^0_f \ (NO(g)) + 6\ mol \times \Delta H^0_f(H_2O)] - [ 4 \ mol \times \Delta H^0_f \ (NH_3(g)) + 5 \ mol \times \Delta H^0_f \ (O_2)][/tex]

[tex]\Delta H^0 = [ 4 \ mol \times90.29 \ kJ/mol + 6\ mol \times -241.826 \ kJ/mol - [ 4 \ mol \times-45.9 \ kJ/mol + 5 \ mol \times 0][/tex]

[tex]\mathbf{\Delta H^0 = -906.196 \ kJ}[/tex]

c) The value of ΔH^o, calculated using average bond energies, is only considered to be an estimate of the standard enthalpy change for the reaction because there is a premise in the calculation that all the bonds broken in the reactant and all bonds are formed in products. Meanwhile, only little bonds are broken, and only little bonds are formed during the reaction.

Answer:

a. c= silver/ 234J(kg/K) > b. c= water/ 4190 J(kg/K) > c. c= glass/ 754J/(kg.K)

Explanation:

Hello.

In this case, since the heat resulting from the temperature change for an specified amount of a substance is defined via:

[tex]Q=mCp\Delta T[/tex]

Since the specific heat is related to amount of energy required to raise the temperature of 1 kg of a substance by 1 °C, we can infer that the higher the specific heat, the higher the required energy as they are in a directly proportional relationship. Moreover, since the specific heat and the change in temperature are in an inversely proportional relationship, we can infer that the higher the specific heat, the lower the temperature change, therefore, we can rank the substances follows:

a. c= silver/ 234J(kg/K) > b. c= water/ 4190 J(kg/K) > c. c= glass/ 754J/(kg.K)

It means that silver will produce the largest temperature change, next water and finally glass since silver has the smallest specific heat next water and finally glass.

Best regards.