predict what would happen if two people with equal mass standing on skateboard pushed against each other

The change in the velocity = 4 m/s

Acceleration = 4 m/s²

Given

vo = initial velocity = 4 m/s

vf = final velocity = 8 m/s

t = 1 s

Required

The change in the velocity

Acceleration

Solution

the change in velocity =

[tex]\tt vf-vo=8-4=4~m/s[/tex]

Acceleration = ratio of a change in velocity and the time

[tex]\tt a=\dfrac{\Delta v}{t}= \dfrac{vf-vo}{t}[/tex]

Input the value :

[tex]\tt a=\dfrac{4~m/s}{1~s}=4~m/s^2[/tex]

Answer:

composition reaction has only one reactant

I hope it helps you

Answer:

T

Explanation:

Answer:

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

Explanation:

determine the genotypes of the parent organisms.

write down your "cross" (mating)

draw a p-square.

4. " ...

determine the possible genotypes of the offspring by filling in the p-square.

summarize results (genotypes & phenotypes of offspring)

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:

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:

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:

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:

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

Answer:

one mole or 31.9

Explanation:

I hope this helps

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

Explanation: i did that test

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:

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: water molecules are polar and Os are slightly negative. Na loses its electron to the nearest H and so is positive. The overall reaction is that the single electron of Na attaches to a H, breaking the bond with O. This leaves Na+ and the OH- ions in solution, while the H atoms form H2 and are released as gas.

Explanation:

According to the forces of attraction in molecules where there is attraction between opposite charges the water molecules orient themselves such that their oxygen atoms are facing the sodium.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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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 number of valence electrons in an atom is reflected by its position in the periodic table of the elements (see the periodic table in the Figure below). Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next

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

Alkyl halide, Isobutylene

Explanation:

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:

10.9%.

Explanation:

The first thing to do in order to solve this question is to Determine the value for the volume of the the cube. This can be done by taking the cube root of the length of the cube;

The volume of the cube = (length of the cube)^3 = length × length × length = 1.72 × 1.72 × 1.72 =( 1.72)^3 = 5.09cm^3.

The next thing you do is to Determine the exponential density, the can be done by using the formula below;

The exponential density = mass/ volume = 55. 786/ 5.09 = 10.96 g/cm^3.

Therefore, the percent error = (true density of the cube - exponential density of the cube)÷ true density of the cube × 100.

Hence, the percent error = 12.30 - 10.96/12.30 × 100 = 10.9%.

False.

Arteries are said to be more muscular.

That means Arteries ARE* MUSCLES

Answer:

80.685 feet/second

Explanation:

Answer:

3.6782514841

Explanation:

6.43x106=681.58

1.7x109= 185.3

681.58/185.3= 3.6782514841

Answer:

0.17 atm

Explanation:

Raoult´s law can be applied in solving this problem:

Pa= XaPºa   (a= acetyl bromide in this case)

where Pa = partial pressure acetyl bromide

         Xa = mole fraction of acetyl bromide in the solution

          Pºa=  vapor pressure of pure acetyl bromide = 0.75 atm(given)

Hence we can find the mole fraction of the acetone in the mixture:

Let the number of moles of acetone be a and the number of moles of thiophene be t

Xa = mol of a / ( mol of a + mol of t )        

We now have;

Molar Weight of  a= 112.95 g/mol  

number of moles of a = 51.8 g/mol x 1 mol/122.95 g  =  0.42 moles

Molar Weight of t = 84.14 g/mol  

number of moles of  t = 123 g x  1mol/84.14 g= 1.46 mol

mole fraction of a; Xa = 0.42/ (0.42 + 1.46) = 0.22

Pa = 0.22 x 0.75 atm = 0.17 atm

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

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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