9th grade science need help ASAP

if I'm not mistaking it would be the second option

Answer:

Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction. The law of conservation of mass states that the total mass of substances taking part in a chemical reaction is conserved during the reaction.

Answer:

Atoms are made of protons, neutrons and electrons.

Explanation:

The Dalton's atomic theory was an early attempt at describing the properties of atoms. It stipulated that atoms were the smallest indivisible particle of a substance. Chemical reactions occur as a result of a combination or separation of atoms. Atoms of the same element are exactly alike and differ from atoms of other elements. Atoms can neither be created nor destroyed.

As time went on, modern scientific evidence began to modify the original postulates of the Dalton's atomic theory. It was not postulated in 1805 that atoms were composed of subatomic particles; electrons, neutrons and protons. Dalton's theory held the atom to be 'indivisible'. However in 1897, JJ Thompson discovered the electron. Subsequently, the proton and neutrons were discovered. This shows that the atom in itself consisted of even smaller particles.

Ethanol (C2H6O), an alcohol has a much higher boiling point than dimethyl ether (C2H60) because hydrogen bonds found in the former are typically much stronger attractions than ordinary dipole moments in the latter.

This is referred to as the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

Ethanol (C2H6O), an alcohol has a much higher boiling point than dimethyl ether (C2H60) because hydrogen bonds have a stronger attraction which  makes it more difficult for the atoms to be broken down hence the reason why the boiling point will be higher in this scenario.

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Answer:

i belive your talking about Conduction

Explanation:

if  im

wrong comment

After the reaction is complete, no nitrogen and no hydrogen molecules remain, and 8.00 x 1014 molecules of NH3 are produced.

In the equation, nitrogen and hydrogen react at a high temperature, in the presence of a catalyst, to produce ammonia, according to the balanced chemical equation:N2(g)+3H2(g)⟶2NH3(g)The coefficients of each molecule suggest that one molecule of nitrogen reacts with three molecules of hydrogen to create two molecules of ammonia.

So, to determine how many molecules of ammonia are produced when four nitrogen and nine hydrogen molecules are present, we must first determine which of the two reactants is the limiting reactant.

To find the limiting reactant, the number of moles of each reactant present in the equation must be determined.

Calculations:
Nitrogen (N2) molecules = 4Hence, the number of moles of N2 = 4/6.02 x 1023 mol-1 = 6.64 x 10-24 mol
Hydrogen (H2) molecules = 9Hence, the number of moles of H2 = 9/6.02 x 1023 mol-1 = 1.50 x 10-23 mol

Now we have to calculate the number of moles of NH3 produced when the number of moles of nitrogen and hydrogen are known, i.e., mole ratio of N2 and H2 is 1:3.

The mole ratio of N2 to NH3 is 1:2; thus, for every 1 mole of N2 consumed, 2 moles of NH3 are produced.
The mole ratio of H2 to NH3 is 3:2; thus, for every 3 moles of H2 consumed, 2 moles of NH3 are produced.
From these mole ratios, it can be observed that the limiting reactant is nitrogen.

Calculation for NH3 production:
Nitrogen (N2) moles = 6.64 x 10-24 moles
The mole ratio of N2 to NH3 is 1:2; therefore, moles of NH3 produced is 2 × 6.64 × 10−24 = 1.33 × 10−23 moles.

Now, to determine how many molecules of NH3 are produced, we need to convert moles to molecules.
1 mole = 6.02 x 1023 molecules
Thus, 1.33 x 10-23 moles of NH3 = 8.00 x 1014 molecules of NH3 produced.

To find the amount of each reactant remaining after the reaction is complete, we must first determine how many moles of nitrogen are consumed, then how many moles of hydrogen are consumed, and then subtract these from the initial number of moles of each reactant.

The moles of nitrogen consumed = 4 moles × 1 mole/1 mole N2 × 2 mole NH3/1 mole N2 = 8 moles NH3
The moles of hydrogen consumed = 9 moles × 2 mole NH3/3 mole H2 × 2 mole NH3/1 mole N2 = 4 moles NH3
Thus, the moles of nitrogen remaining = 6.64 × 10−24 mol – 8 × 2/3 × 6.02 × 10^23 mol-1 = 5.06 × 10−24 mol
The moles of hydrogen remaining = 1.50 × 10−23 mol – 4 × 2/3 × 6.02 × 10^23 mol-1 = 8.77 × 10−24 mol

Finally, the number of molecules of each reactant remaining can be calculated as follows:
Number of N2 molecules remaining = 5.06 × 10−24 mol × 6.02 × 10^23 molecules/mol = 3.05 × 10−1 molecules ≈ 0 molecules
Number of H2 molecules remaining = 8.77 × 10−24 mol × 6.02 × 10^23 molecules/mol = 5.28 × 10−1 molecules ≈ 0 molecules.

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Answer:

pH = 7.49

Explanation:

This is a buffer solution. We can apply Henderson Hasselbach equation:

pH = pKa + log ((total mmoles - mmoles HCl) / mmoles HCl)

We have the same amount of mmoles.

35 mL . 0.400 M = 14 mmoles HCl

35 mL . 0.400 M = 14 mmoles NaClO

Total moles are 28 mmoles.

We replace data:

pH = pKa + log ((28 mmoles -14 mmoles) / 14 mmoles)

Notice that the relation in log = 1. So pH = pKa

pKa for HClO is 7.49

When pH = pKa we have the same amount of base and acid. Notice, that we have the same mmoles of HCl and NaClO.

Remember that a buffer can be prepared with:

a) A weak acid and its conjugate base (acetic /acetate)

A weak base and its conjugate acid (ammonia/ammonium)

b) A weak acid with a strong base, where the acid can be in excess.

c) A conjugate base (salt from weak acid) with a strong acid, where the base can be in excess. (This case but, the base is not in excess, that's why ph = pKa)

As per the given data, 1.6 grams of oxygen reacted in this experiment.

To calculate the amount of oxygen that reacted in the experiment, we need to determine the difference in the mass of X oxide (X,O) formed and the mass of X initially used.

Given:

Mass of X = 4.6 g

Mass of X oxide (X,O) = 6.2 g

To find the amount of oxygen that reacted:

Mass of oxygen = Mass of X oxide - Mass of X

= 6.2 g - 4.6 g

= 1.6 g

Therefore, 1.6 grams of oxygen reacted in this experiment.

Calculate the mass of 1 mole of X:

Given that the mass of X is 4.6 g, we can calculate the molar mass of X by dividing the mass by the number of moles:

Molar mass of X = Mass of X / Number of moles of X

Molar mass of X = 4.6 g / 0.1 mol

Molar mass of X = 46 g/mol

Therefore, the mass of 1 mole of X is 46 grams.

Thus, the answer is 46 grams.

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The internal energy △E of the gas increased by 7,012.5 J.

The internal energy change of a system is given by the equation: ΔE = q + w where ΔE is the change in internal energy, q is the heat added to the system, and w is the work done by the system.

Since the volume remains constant, no work is done, so w = 0. Therefore, ΔE = q.

The heat added to the system is given by the equation:

q = nC(v)ΔT

where n is the number of moles of gas, C(v) is the molar specific heat capacity at constant volume, and ΔT is the change in temperature.

Substituting the given values, we get:

q = (1.00 mol) x (25.00 J/mol.K) x (280.5 K - 140.0 K)

q = 7,012.5 J

Therefore, the internal energy change for this process is:

ΔE = q = 7,012.5 J

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Explanation:

Look please al the following drawing:

The radicals (in blue) will be written between ( ):

(CH3)2CHCH(CH2CH3)CH(CH3)CH2CH3

Answer:

0.02kg

Explanation:

Given parameters:

Amount of heat  = 5200J

Unknown:

Mass of ice that would be melted at 0°C = ?

Solution:

To solve this problem, use the expression below;

        H  = mL

H is the heat

m is the mass

L is the latent heat of fusion of ice  =  3.33 x 10⁵ J/kg.

 Insert the parameters and solve for m;

           5200  = m x 3.3 x 10⁵

             m  = \(\frac{5200}{3.33 x 10^{5} }\)   = 0.02kg

Answer:

An alcohol is an organic compound with a hydroxyl (OH) functional group on an aliphatic carbon atom. Because OH is the functional group of all alcohols, we often represent alcohols by the general formula ROH, where R is an alkyl group. Alcohols are common in nature.

Explanation:

Answer:

The water bends due to the static electricity on the balloon.

Explanation:

The static electricity you built up by rubbing it against the balloon attracts the stream of water, bending it towards the comb or balloon like magic!

Negatively charged particles called electrons jump the wool to the balloon as they rub together, the comb now has extra electrons and is negatively charged. The water features both positive and negatively charged particles and is neutral. Positive and negative charges are attracted to each other so when you move the negatively charged balloon towards the stream, it attracts the water's positively charged particles and the stream bends!

Answer:

Conduction

Explanation:

The handle is touching the pot.

And I got it wrong

First, we need to determine the mass of water in the pool:

mass = density x volume

density of water = 1000 kg/m³

volume = length x width x depth

volume = 10.0 m x 4.0 m x 3.0 m = 120 m³

mass = 1000 kg/m³ x 120 m³ = 120000 kg

Next, we need to calculate the heat required to raise the temperature of the water:

q = m x c x ΔT

where q is the heat energy, m is the mass of water, c is the specific heat of water, and ΔT is the change in temperature.

c = 4.18 J/g°C (specific heat of water)

ΔT = 27.3°C - 20.2°C = 7.1°C

m = 120000 kg

q = 120000 kg x 4.18 J/g°C x 7.1°C = 35792400 J

Next, we need to convert the energy required to burn methane to heat energy:

-891 kJ/mol x (1 mol CH4/160 g CH4) x (1000 g/1 kg) = -5.569 kJ/g

We can now calculate the amount of methane needed:

energy = -5.569 kJ/g x mass CH4

mass CH4 = energy / (-5.569 kJ/g)

mass CH4 = 35792400 J / (-5569 J/g) = -6431.6 g

At STP, 1 mole of any gas occupies 22.4 L of volume. We can use this to convert the mass of methane to volume at STP:

1 mol CH4 = 16 g CH4

-6431.6 g CH4 x (1 mol CH4/16 g CH4) x (22.4 L/1 mol CH4) = -9074.4 L

Since we cannot have a negative volume, we can take the absolute value of the result:

|9074.4 L| = 9074 L

Therefore, approximately 9074 liters of methane gas at STP must be burned to raise the temperature of the water in the pool from 20.2°C to 27.3°C.

Answer:

The atomic mass of second isotope is 112.926 amu.

Explanation:

Given data:

Average atomic mass of indium = 114.818 amu

Atomic mass of one isotope = 114.903 amu

Percentage abundance of 1st isotope = 95.70%

Mass of other isotope = ?

Solution:

First of all we will calculate the percentage abundance second isotope.

100 -  95.70% = 4.3%

percentage abundance of second isotope = 4.3%

Now we will calculate the mass if second isotope.

Average atomic mass of indium = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

114.818 = (114.903×95.70)+(x×4.3) /100

114.818 =   10996.2171 + (x4.3) / 100

114.818×100 = 10996.2171 + (x4.3)

11481.8 -  10996.2171  = (x4.3)

485.583 = x

x = 485.583 /4.3

x = 112.926

The atomic mass of second isotope is 112.926.

Complete Question

The complete question is shown on the first uploaded image

Answer:

For reaction 1

    \(K_{eq} = 10^{29}\)

     The equilibrium position is to the right

For reaction 2

        The equilibrium position is to the left

Explanation:

Generally  \(pKa\) is mathematically evaluated as  

\(pKa = pKa _ \ {left }} - pKa _ \ {right }}\)

And equilibrium position \(K_a\) is mathematically evaluated as \(K_{eq} = 10^\ {-pK_a}\)

From the question we are told that

For reaction 1

         \(pKa_\ {left}} \ = 9\)

        \(pKa_\ {right }} \ = 38\)

So

       \(pKa = 9-38\)

       \(pKa =-29\)

So  \(K_{eq} = 10^{-(-29)}\)

      \(K_a = 10^{29}\)

This implies that the equilibrium position is to the right

   For reaction 2

       \(pKa_\ {left}} \ = 15.9\)

       \(pKa_\ {right }} \ = 9.24\)

So

       \(pKa = 15.9-9.24\)

       \(pKa = 6.66\)

So  \(K_{eq} = 10^{-(6.66)}\)

      \(K_{eq} = 10^{-6.66}\)

This implies that the equilibrium position is to the left

The value of Kc for the given reaction is 0.0579 (rounded to four decimal places).

The formula for the equilibrium constant, Kc, of a reaction is given by the ratio of the product of the concentrations of the products raised to their respective stoichiometric coefficients to the product of the concentrations of the reactants raised to their respective stoichiometric coefficients.

The stoichiometric coefficients are the coefficients in the balanced chemical equation.

To determine the value of Kc for the reaction given by the following chemical equation:N2(g) + 3 H2(g) ⇌ 2 NH3(g)

we first need to write the expression for Kc.

The expression for Kc is given by the following formula:Kc = [NH3]² / [N2][H2]³.

We are given the equilibrium concentrations as follows:[N2]eq = 2.66 M[H2]eq = 0.64 M[NH3]eq = 3.34 M

We can substitute these values into the expression for Kc and obtain the following:Kc = (3.34)² / (2.66)(0.64)³ = 0.0579 (rounded to four decimal places).

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Answer:

C

Explanation:

The battery is chemical energy. When it is used in the flashlight, it produces light and thermal energy

PLZ MARK BRAINLIEST :)

1) Molar mass. In order to find the molar mass of a compound, we have to look for each molar mass of the elements in the compound and multiply by its subscript.

Phosphorus (P): 30.974

Bromide (Br): 79.905

MM PBr5 = 30.974 + (5*79.905) = 430.499.

The answer is 430.6

Answer:

The frequency is 1000 cycles/s

Explanation:

An alternating current is an electrical current in which the current changes its magnitude and the sense cyclically. The frequency of this current is defined as the cycles that the current completes in one second.

As the current completes 100 cycles in 0.1 seconds, the frequency is:

100 cycles / 0.1s = 1000 cycles /s

The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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The covalent bond is present in the compound C₃H₈. The reactant C is 3, product C is 6, reactant H is 8, product H is 10, Reactant O is 2, product O is 9.

What is covalent bond ?

Atoms share electron pair between them in covalent bonds. H-H or C-H are examples of nonpolar covalent bonds between atoms with similar or identical electronegativity, whereas polar covalent bonds are formed when unequal electronegativity is shared between atoms (e.g., H–O).

What is reactant ?

Raw materials known as reactants combine to create products. When the right factors, such as temperature, time, or pressure, come into play, the chemical bonds between the reactants are broken, allowing the atoms to form new bonds that lead to various combinations.

Therefore, covalent bond is present in the compound C₃H₈. The reactant C is 3, product C is 6, reactant H is 8, product H is 10, Reactant O is 2, product O is 9.

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Answer::

Explanation::

Answer:

See the answer below.

Explanation:

If an aqueous solution of two salts contains both Na2CO3 and Na2SO4, the following steps will prove the occurrence of both carbonate and sulphate ions:

1. Add a dilute acid (such as HCl) to the solution. The presence of carbonate ion will result in the release of carbon dioxide gas which will be shown by formation of effervescent bubbles. The gas can be proven to be carbon dioxide by channeling it into a lime water which usually turns milky with the presence of the gas.

\(CO^{2-}_3(aq) + 2H^+(aq) ==> H_2O(l) + CO_2(g)\)

2. Add barium chloride to an acidified portion of the aqueous solution. The presence of sulphate ion will be indicated by the formation of white barium sulphate precipitate. Initial acidification is done to disperse off any carbonate ion that might be present in the solution and give a false-positive white precipitate result.

\(Ba^{2+}(aq) + SO^{2-}_4(aq) --> BaSO_4(s)\)