Using the law of conservation of energy, what is the kinetic energy at C? K.E. =

Answer:

chlorine, fluorine, bromine, iodine, Xenon, and radon

Answer:

A.Lithium (Li)

since fluorine and nitrogen gain electron and becomes negative ion.

since magnesium loose two electron.

Answer:

c. 3

Explanation:

The unbalanced reaction expression is given as:

          Fe  +  O₂  →   Fe₂O₃  

To balance the expression gives the coefficient of oxygen.

Assign the coefficients a,b, c and use a mathematical approach to solve this problem:

             aFe  +  bO₂  →  cFe₂O₃

Conserving Fe: a  = 2c

                    O:  2b  = 3c

Now let c = 1, a  = 2, b  = [tex]\frac{3}{2}[/tex]

  Multiply through by 2,

             a = 4, b = 3 and c  = 2

               4Fe  +  3O₂  →   2Fe₂O₃  

The coefficient of O₂ is 3

Answer:

D = Mass =  42.6 g

Explanation:

Given data:

Mass of phosphorus react = 33 g

Mass of oxygen needed = ?  

Solution:

Chemical equation:

4P + 5O₂     →      2P₂O₅

Number of moles of phosphorus:

Number of moles = mass/molar mass

Number of moles = 33 g/ 30.97 g/mol

Number of moles = 1.065 mol  

now we will compare the moles of phosphorus and oxygen.  

               P         :       O₂  

               4         :        5  

        1.065        :        5/4×1.065 = 1.33mol

Mass of oxygen needed:

Mass = number of moles × molar mass

Mass = 1.33 mol × 32 g/mol  

Mass = 42.6 g

Thus, 43.6 g of oxygen needed to react with 33 g of phosphorus.

Answer:

1.hypothesis

2.ask a question

3.experiment

4.collect observations

5.analyze data

6.draw conclusion

Explanation:

Answer:

80.685 feet/second

Explanation:

The total weight in pounds should be listed on the billing sheet is [tex]7.5135\times 10^2 pounds[/tex].

Explanation:

                        [tex]3.45\times 10^{16}[/tex] Liters of water

                       [tex]4.89\times 10^{-9}[/tex]meters

Given:

Weight of sofa = 158 pounds

Weight of chair = 65.7 pounds

Weight of piano =[tex]3.8\times 10^2 pounds[/tex]

Weight of several boxes = 147.65 pounds

To find:

Total weight in pounds

Solution:

Weight of sofa = 158 pounds

Weight of chair = 65.7 pounds

Weight of piano =[tex]3.8\times 10^2 pounds=380 pounds[/tex]

Weight of several boxes = 147.65 pounds

Total weight of all the items in pounds:

[tex]=158 pounds + 65.7 pounds +380 pounds+147.65 pounds\\=751.35 pounds\\=\frac{751.35\times 10^2}{10^2}=7.5135\times 10^2 pounds[/tex]

The total weight in pounds should be listed on the billing sheet is [tex]7.5135\times 10^2 pounds[/tex].

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Answer:

179 L of CO2

Explanation:

Given the equation of the reaction;

C2H6(g) + 7/2 O2(g) -------> 2CO2(g) + 3H2O(g)

Now 1 mole of ethane yields 2 moles of CO2 from the balanced reaction equation

1 mole of a gas occupies 22.4 L volume so,

22.4 L of ethane yields 44.8 L of CO2

89.5 L of ethane yields 89.5 * 44.8/22.4 = 179 L of CO2

Answer:

the answer is nitrogen and rubidium (C)

Explanation:

ionic bonds only form between metals and non-metals

Answer:

T

Explanation:

Answer:

D

Explanation:

Algae produces their own energy through photosynthesis, making them autotrophs. Fish have to consume energy by eating other organisms making them heterotrophs.

Answer:

one mole or 31.9

Explanation:

I hope this helps

Answer:

ΔH°(f) = -110.5 Kj/mole (exothermic)

Explanation:

C + 1/2O₂ => CO

This is asking for the 'Standard Heat of Formation (ΔH°(f)* for carbon monoxide (CO). Values for many compounds can be found in the appendix of most college general chemistry text books. From Ebbing & Gammon, 11th edition, General Chemistry, Appendix C, page 8A.

*Standard Heat of Formation by definition is the heat gained or lost on formation of a substance (compound) from its basic elements in standard state.

The ΔH°(f) values as indicated are found in the appendix of most college chemistry texts. By choosing any compound, one can determine the standard heat of formation equation for the substance of interest. For example, consider Magnesium Carbonate; MgCO₃(s).The basic standard states of each element is found in the Appendix on Thermodynamic Properties for Substances at 25°C & 1 atm. having  ΔH°(f) values = 0.00 Kj/mole. All elements in standard state have a 0 Kj/mol. See appendix and note that under the ΔH°(f) symbol some substances have 0.00 Kj/mol values. The associated element will be in basic standard state,

Standard Heat of Formation Equation for formation of Magnesium Carbonate;

Mg°(s) + C°(gpt)* + 3/2O₂(g) => MgCO₃(s) ; ΔH°(f) = -1111.7 Kj/mole

* gpt => graphite

Alkyl halide, Isobutylene

Explanation:

Answer :

Dipole moments occur when there is a separation of charge. Dipole moments occur due to atoms electronegativity, where one atom has the ability to attract electrons towards it giving it a negative charge and the one deficient in electrons acquire a positive charge called as the bond moment.

But if the bond moments are equal and opposite in direction , they cancel each other and thus there is no net dipole moment in the molecule.

For example: In carbon dioxide , both the -C=O bonds are polar but as the molecule is linear and the the magnetic moments are equal and oppposite, they cancel each other and the molecule is non polar.

Answer:

The velocity of a sound wave is affected by two properties of matter: the elastic properties and density.

Explanation:

The speed of sound is faster in solid materials and slower in liquids or gases. The velocity of a sound wave is affected by two properties of matter: the elastic properties and density.

The speed of sound also depends on the temperature of the medium. The hotter the medium is, the faster its particles move and therefore the quicker the sound will travel through the medium. When we heat a substance, the particles in that substance have more kinetic energy and vibrate or move faster.

Hope that helps!

Answer:

Hi. I'll explain

Explanation:

[tex]11.2mol \times \frac{22.4liter}{1mol} = 250.88 [/tex]

If you round it it will be 251

D is the answer (251)

Answer:

A. vapor pressure of a pure liquid equals an external pressure of one atmosphere.

Explanation:

Boiling point of a chemical substance can be defined as the specific temperature in which the vapor pressure of a liquid is equal to the atmospheric pressure around the liquid and as a result causing the liquid to transform into a vapor.

The normal boiling point occurs when the vapor pressure of a pure liquid equals an external pressure of one atmosphere (1 bar) and thus, causing bubbles of vapor to form.

Answer:

9.11 L

Explanation:

An arctic weather balloon is filled with 10.2 L of helium gas inside a prep shed. The temperature inside the shed is 9 °C. The balloon is then taken outside, where the temperature is -21 °C. Calculate the new volume of the balloon. You may assume the pressure on the balloon stays constant at exactly 1 atm. Round your answer to 3 significant digits.

Step 1: Given data

Step 2: Convert the temperatures to the Kelvin scale

We will use the following expression.

K = °C + 273.15

K = 9 °C + 273.15 = 282 K

K = -21 °C + 273.15 = 252 K

Step 3: Calculate the final volume of the balloon

We can calculate the final volume of the balloon using Charle's law.

V₁/T₁ = V₂/T₂

V₂ = V₁ × T₂/T₁

V₂ = 10.2 L × 252 K/282 K = 9.11 L

Answer:

B. Convert mass percents to moles and then divide by the smallest mole value to get subscripts

Explanation:

The empirical formula is the smallest whole number ratio the elements in a compound can possess. According to this question, to derive the empirical formula of a compound from its percent composition of elements that make it up, the following steps are followed:

- First, since the elements are in percentage, one would assume the total mass of the compound is 100g and take each percentage as the mass of each element. For example, if a compound contains 16% oxygen, it means that 16g of oxygen is present.

- Next, we convert the mass of each element to moles by dividing the mass value by the molar mass of each element. For example, 16g of oxygen will be 16g/16g/mol = 1mol

- Next, we divide each mole value by the smallest mole value to get the subscript of each element that will be used in the empirical formula.

Answer:

the answer is B. Convert mass percents to moles and then divide by the smallest mole value to get subscripts.

Explanation:

that's how it is done

The absolute age of an igneous rock can best be determined by measuring the amounts of radioactive isotopes in the rock. Option A is correct.

Igneous rock is formed and arises as a result of the cooling and solidification of the molten magma underneath the earth surface.

Igneous rock can best be determined by measuring the amounts of radioactive isotopes present in the rock because this will be used for radiometric dating which will eventually determine the absolute age of the igneous rock.

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Answer:

8

Explanation:

Inside this shell

In p orbital there r 6 electrons

And in s orbital thr is 2

Add them

Answer:

3.6782514841

Explanation:

6.43x106=681.58

1.7x109= 185.3

681.58/185.3= 3.6782514841

Answer:  Both the shape of a coastline and the path of a river

Explanation: i did that test

Answer:

B. Equal amounts of all gases have the same volume at the same

conditions

Explanation:

Amedo Avogadro found the relationship between volume of a gas and the number of molecules contained in the volume.

The law states that "equal volumes of all gases at the same temperature and pressure contains equal number of molecules or moles".

The law describes the behavior of gases when involve in chemical reactions. It enables one to change over at will in any statement about gases from volumes to molecules and vice versa.

So, the right option is B which implies that equal amounts of all gases have the same volume at the same conditions.

Answer:

1.204×10^24 atoms

Explanation:

1 mole of element contains 6.02×10^23 atoms so 2 moles of hydrogen contains 2×6.02×10^23 = 1.204×10^24 atoms

Answer:

 to locate and possibly retrieve the buses

Explanation:

The buses are presumed to be made of steel. Presumably, a bus and the magnet are mutually attractive. The magnet could be used to locate a missing bus, and possibly retrieve it.

Given

speed = 1000 m/s or velocity (v) = 1000 m/s

frequency (f) = 500 Hz

wavelength (λ) = ?

We know,

λ = v/f

λ = 1000/ 500

λ = 2 m

It's wavelength is 2 m.

Hope it will help :)

If a wave has a wave speed of 1000 M/S anything see a 500 HZ, the wavelength of wave is  2 m.

The distance among identical spots between two succeeding waves is known as the wavelength, which is a feature of waves. The wavelength of a wave is the distance among one wave's peak (or trough) and the next. In mathematics, the Greek symbol lambda () is used to denote wavelength.

The color of light is determined by its wavelength, and the pitch of sound is determined by its wavelength. The visible spectrum of light has wavelengths between around 700 nm (red) and 400 nm (violet). The color of light is determined by its wavelength, and the pitch of sound is determined by its wavelength.

speed = 1000 m/s

frequency = 500 Hz

wavelength (λ) = ?

λ = v/f

λ = 1000/ 500

λ = 2 m

Therefore, the wavelength of wave is 2 m.

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Answer:

See explanation

Explanation:

Usually, the central atom in a molecule is often the atom having the least electronegativity in the compound.

In CO2F^-, the central atom is carbon. The structure is related to the structure of CO2. In CO2F^-, carbon is sp hybridized. The molecule is linear.

In S2Cl2, sulphur is the central atom. There are two central sulphur atoms each connected to one chlorine atom. The sulphur atoms are sp3 hybridized with two lone pairs on each sulphur atom. The molecular geometry is bent.

[tex]CO_2F^-[/tex] has a flat geometry, with carbon as the central atom. On the other hand, [tex]S_2Cl_2[/tex] has a folded geometry, with two sulfur atoms as the central atoms.

We can arrive at this answer because:

In this case, when we observe the position of the atoms and the geometry of the molecules of [tex]CO_2F^-[/tex] and [tex]S_2Cl_2[/tex] we can see that they are flat and folded as shown in the figure below.

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