I’ve been up all night doin chemistry, can someone please give me the answers

Answer : The heat your body transfer must be, 25.1 kJ

Explanation :

Formula used :

[tex]Q=m\times c\times \Delta T[/tex]

or,

[tex]Q=m\times c\times (T_2-T_1)[/tex]

where,

Q = heat = ?

m = mass of water = 500.0 g

c = specific heat of water = [tex]4.18J/g^oC[/tex]

[tex]T_1[/tex] = initial temperature  = [tex]25.0^oC[/tex]

[tex]T_2[/tex] = final temperature  = [tex]37.0^oC[/tex]

Now put all the given value in the above formula, we get:

[tex]Q=500.0g\times 4.18J/g^oC\times (37.0-25.0)K[/tex]

[tex]Q=25080J=25.1kJ[/tex]

Therefore, the heat your body transfer must be, 25.1 kJ

Answer:

B

Explanation:

Cooling towers provide an energy efficient and environmentally friendly way of removing heat from this circulating water before it is returned to its source.

The equilibrium constant, Kp, can be calculated using the formula Kp = (PNO2)^2 / PN2O4, where PNO2 and PN2O4 are the partial pressures of NO2 and N2O4 at equilibrium. In this case, the given partial pressures are 0.35 atm and 4.3 atm, respectively. By substituting these values into the formula, we find that Kp is approximately 52.37.

The equilibrium constant, Kp, is a measure of the ratio of the product pressures to the reactant pressures at equilibrium. In this case, we are given the partial pressures of N2O4 (0.35 atm) and NO2 (4.3 atm) at equilibrium. Since Kp is defined as the ratio of product pressures to reactant pressures, we can calculate Kp using the formula Kp = (PNO2)2 / PN2O4.

Substituting the given values into the formula gives Kp = (4.3)2 / 0.35 = 52.37. Therefore, the equilibrium constant Kp is approximately 52.37.

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The equilibrium constant (Kp) for the equilibrium between [tex]NO_2[/tex] and [tex]N_2O_4[/tex] with given partial pressures is 0.0189.

The degree of thermodynamic activity of a gas corresponds to its partial pressure.

To calculate the equilibrium constant (Kp) for the reaction 2 [tex]NO_2[/tex](g) = [tex]N_2O_4[/tex] (g), we use the following equilibrium expression:

[tex]Kp = (PN_2O_4) / (PNO_2)2[/tex]

Given the partial pressures at equilibrium, [tex]PN_2O_4 = 0.35[/tex] atm and [tex]PNO_2 = 4.3[/tex] atm, we can substitute these values into the equation to find the Kp:

Kp = (0.35) / (4.3)2

After squaring the partial pressure of [tex]NO_2[/tex] and dividing by the partial pressure of [tex]N_2O_4[/tex], we get:

Kp = 0.35 / 18.49

Kp = 0.0189 (to four significant figures)

Answer:

c

Explanation:

heatmass*density*temp. difference=

In the sample, the mass of water is "225 g".

Given:

Heat energy,

Specific heat,

The change in temperature,

              [tex]= 100-88[/tex]

              [tex]= 12 ^{\circ} C[/tex]

As we know,

→             [tex]Q = mc \Delta T[/tex]

→ [tex]1.13\times 10^4=m\times 4.186\times 12[/tex]        

→              [tex]m = \frac{1.13\times 10^4}{4.186\times 12}[/tex]

→                   [tex]= 224.956 \ g[/tex]

or,

→                   [tex]= 225 \ g[/tex]

Thus the answer above is appropriate.

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Answer:

Why would it be false? That would be a great magic act.

Explanation:

Answer:

Explanation:

Alchemy is the forerunner of modern chemistry practiced during the medieval times. Chemists of those times were known and called alchemists.

These chemists had a very shallow knowledge of chemistry but were able to produce a wide range of chemicals.

Answer:

C. Bronsted-Lowry base

Explanation:

Also the same answer is for...

The compound given in red Mg(OH)2 is Option(C) Arrhenius base and Option(D) Bronsted-Lowry base.

Arrhenius theory states that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydronium ions (OH−).

According to Bronsted-Lowry theory, acid is a substance which donates an H+ ion and forms its conjugate base and the base is a substance which accepts an H+ ion and forms its conjugate acid.

The compound given Magnesium Hydroxide Mg(OH)2 is an Arrhenius base therefore it is also a Bronsted-Lowry base. Magnesium Hydroxide accepts the hydronium ion from the product thereby forming the conjugate acid. Magnesium Hydroxide also dissolves in water in neutral medium to yield hydronium ions (OH−).

Therefore, the compound given in red Mg(OH)2 is Option(C) Arrhenius base and Option(D) Bronsted-Lowry base.

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Answer Archeology

Explanation:

You like to dig holes? ARCHEOLOGY

Answer:

D. It moves energy through space

Explanation:

i searched it

Answer: M = 0.01 M C12H22O16

Explanation: First convert the mass of C12H22O16 into moles using the molar mass of the compound.

5 g C12H22O16 x 1 mole C12H22O16 / 342 g C12H22O16

= 0.01 mole C12H22O16

To calculate the molarity we will use the following formula.

M = n / L

= 0.01 mole / 1 L

= 0.01 M C12H22O16

Final answer:

To find the molarity of a sugar solution with 5g of sucrose in 1L of water, calculate the moles of sucrose and divide by the volume. The molarity of this solution is 0.01 M C12H22O16

Explanation:

The question asks to find the molarity of a sugar solution which is made by dissolving 5g of sucrose (C12H22O11) in enough water to make a 1L solution. First, we need to find the molar mass of sucrose, which is the sum of the atomic masses of its constituent elements: 12 carbons, 22 hydrogens, and 11 oxygens. The molar mass of sucrose is (12 × 12.011) + (22 × 1.008) + (11 × 15.999) = 342.30 g/mol. Now, we calculate the number of moles of sucrose present in 5g and then divide by the volume of the solution in liters to get the molarity.

First convert the mass of C12H22O16 into moles using the molar mass of the compound.

5 g C12H22O16 x 1 mole C12H22O16 / 342 g C12H22O16

= 0.01 mole C12H22O16

To calculate the molarity we will use the following formula.

M = n / L

= 0.01 mole / 1 L

= 0.01 M C12H22O16

Electromagnetic wave travels faster through air than metal.

Option A

Explanation:

There are different kinds of wave energy. The most significant are electromagnetic and mechanical waves. The mechanical waves propagate through the medium by transfer of energy by vibrating of particles in medium.

So, the more number of particles present in the medium, the more fast the mechanical wave can propagate. So the mechanical waves travel faster in metals consisting of more number of free charge carriers. But electromagnetic waves does not need any of the medium to propagate. So it can travel faster in air than in metals.

Answer:

800mL

Explanation:

Using Boyle's law which states that the volume of a given mass of gas is inversely proportional to the pressure, provided temperature remains constant

P1V1= P2V2

P1 = 2 atm, V1 = 2000mL ,

P2 = 5atm , V2 = ?

2 × 2000 = 5 × V2

Divide both sides by 5

V2 = 4000 ÷ 5

V2 = 800mL

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Final answer:

The volume of a balloon filled with 2000 mL of air at 2 atm will change to 800 mL when the pressure is increased to 5 atm, as per Boyle's Law, which states that pressure and volume are inversely proportional for a gas at constant temperature.

Explanation:

The principles of gas laws, specifically Boyle's Law, which implies that for a given mass and constant temperature of an ideal gas, the pressure and volume are inversely proportional. We can set up a direct application of Boyle's Law where P1 * V1 = P2 * V2. Given that a balloon is filled with 2000 mL of air at a pressure of 2 atm (P1 and V1), we want to find the new volume (V2) if the pressure is changed to 5 atm (P2).

Using the formula, we can solve for V2 as follows:

V2 = (P1 * V1) / P2

V2 = (2 atm * 2000 mL) / 5 atm

V2 = 4000 mL atm / 5 atm

V2 = 800 mL

Therefore, the volume of the balloon when the pressure is increased to 5 atm is 800 mL.

Answer: B. 12.25 W

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Explanation:

1) Force = Weight = 75 x 9.8 = 735 N

2.)Work = Force x Height = 735 x 5 = 3675 J

3.)Power = Work / Time = 3675 / (5 x 60) = 12.25 W

Answer:

ok so you take the volume then divide it by the pressure, and subtract the area to find the rough estimate. but your probably looking for an exact answer so you take that and then do that when you get that thatll be that.

Explanation:

Decreasing the pressure on the gas will  most likely result in an increase in the volume of a gas.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

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Answer:

84.96K

Explanation:

The following were obtained from the question:

n = 1.5 mole

V = 5.5L

P = 192.4 kPa = 192400Pa

Recall

101325Pa = 1atm

192400Pa = 192400/101325 = 1.9atm

R = 0.082atm.L/K /mol

T=?

We can obtain the temperature by applying the following:

PV = nRT

T = PV / nR

T = (1.9 x 5.5)/(1.5 x 0.082)

T = 84.96K

Answer:

Molecular formula = C₁₀H₂₀

Explanation:

Given data:

Empirical formula = CH₂

Molar mass = 140.27 g/mol

Molecular formula = ?

Solution:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Now we will calculate the empirical formula mass.

CH₂ = 12 × 1 + 1× 2

CH₂ = 12 +2

CH₂ = 14  

n = 140.27 / 14

n = 1 0

Molecular formula = n (empirical formula)

Molecular formula = 10 (CH₂)

Molecular formula = C₁₀H₂₀

Answer:

impedes the flow of electrons

Explanation:

When electricity flowing in a circuit, that means the electron is flowing there too. All objects have resistance which tells how much the material impedes the flow of electron, which in turn will lower the current flowing on the circuit. It won't stop the flow completely. Material with high resistance will be called insulator and material with low resistance called a conductor.

Answer:

directly

Explanation:

Temperature is defined as the average kinetic energy per particle of a gas, hence temperature and average kinetic energy are directly related meaning that if kinetic energy of a gas increases temperature will also increase.

Answer:

30.33L

Explanation:

Using Boyle's law which states that the volume of a given mass of gas is inversely proportional to the pressure, provided temperature remains constant  and Charles law states that the volume of a given mass of gas is directly proportional to the temperature provided the pressure remains constant

P1V1/T1 = P2V2/ T2

P1 =  78atm, V1 = 21L , T1 = 900K

P2 = 45atm, V2 = ? , T2 =750K

78× 21 / 900 = 45×V2 / 750

1638/900 = 45 V2 / 750

1638×750 = 900×45V2

1228500 = 40500V2

Divide both sides by 40500

1228500÷40500= V2

V2 = 30.33L

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Using the combined gas law, we determined the final volume of the gas to be 30.33 liters.

To solve this problem, we'll use the combined gas law, which is expressed as:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

Here, P₁, V₁, and T₁ are the initial pressure, volume, and temperature, and P₂, V₂, and T₂ are the final pressure, volume, and temperature.

We are given the following values:

P₁ = 78 atm

V₁ = 21 liters

T₁ = 900 K

P₂ = 45 atm

T₂ = 750 K

We need to find V₂. Rearrange the combined gas law to solve for V₂:

V₂ = (P₁ * V₁ * T₂) / (T₁ * P₂)

Substitute the given values into the equation:

V₂ = (78 atm * 21 liters * 750 K) / (900 K * 45 atm)

Calculate the result step-by-step:

78 * 21 = 1638

1638 * 750 = 1228500

900 * 45 = 40500

V₂ = 1228500 / 40500 = 30.33 liters

Therefore, the final volume, V₂, is 30.33 liters.

149 g of cobalt are present in 1.52 x [tex]10^{24}[/tex] atoms of cobalt.

Explanation:

One mole of an atom is equal to the Avagadro number of the atom.

              [tex]1 \ mol \ of \ Co = 6.023\times10^{23} atoms\ of \ Co[/tex]

The number of atoms per mol is divided by the given atoms of Cobalt.

                =  [tex](1.52 \times 10^{24}) \times[/tex] [tex]\frac{1 \ mol\ Co}{6.023 \times10^{23}\ atoms\ Co}[/tex]

                = 2.52 mol of Co

To covert, the moles into grams multiply the mole value by its molar mass

The Molar mass of Cobalt is 58.93

                = 2.52 [tex]\times[/tex] 58.93

                = 149 g.      

Using Avogadro's number and the molar mass of cobalt, one can calculate that 1.52 x 10²24 atoms of cobalt equates to approximately 148.51 grams of cobalt.

To determine how many grams of cobalt are in 1.52 x 1024 atoms of cobalt, we need to use Avogadro's number and the molar mass of cobalt. Avogadro's number tells us that there are 6.022 x 1023 atoms in one mole of any substance. The molar mass of cobalt (Co) can be found on the periodic table, and it is about 58.93 grams per mole.

The calculation, similar to conversions seen in examples given, would be as follows:

Therefore, there are 148.51 grams of cobalt in 1.52 x 1024 atoms of cobalt.

Answer:

False.

Explanation:

The Earth's atmosphere is composed of 78% Nitrogen & 21% Oxygen. The other 1% varies.

look on google calculator

Answer:

you ask  them a couple of questions like what would u do in this problem and see their answer

Explanation:

Honestly I'm going through a lot of fake friends right now and I don't have the guts to tell them off cause I feel bad. But a way to see if there fake is if they usually don't want to hang out with you or always change the plans, or just act like your friends when they want something such as buying them stuff, giving them money, or just wanting something. Another way to test is if they do everything they can to give you as little as possible. If they do stuff like this just stop talking to them or try to get away from what they want or ditch them and tell them their fake.

Answer:

The mass of iron piece = 586.84

Explanation:

Given,

Heat absorbed by iron piece(Q) = 5575 Joules.

specific heat capacity(Cp) = 0.95 J/g°C.

initial temperature(T₁) = 20.0°C

Final temperature(T₂) = 30.0°C

Mass of iron piece(m) = ?

The mass of iron piece can be calculated by using the formula ,

Q = (mass) (ΔT) (Cp)

Here, ΔT = T₂ - T₁ = 30°C - 20°C = 10°C

Substituting values we get,

5575 = (m)(10)(0.95)

Solving, we get,

m = 586.84 grams.

Therefore, mass of iron piece = 586.84 grams.

The mass of Na₂O produced from the reaction of 4.00 g of sodium with 2.00 g of oxygen is 5.39 g, using stoichiometry and molar mass conversions.

Reaction Stoichiometry and Mass Calculations

To calculate the mass of Na₂O produced from 4.00 g of sodium (Na) and 2.00 g of oxygen (O₂), first, we need to convert the mass of the reactants to moles using their molar masses. The molar mass of sodium is approximately 23 g/mol, and for oxygen (O₂), it is about 32 g/mol. As a result, we have:

4.00 g Na times (1 mol Na / 23 g Na) = 0.174 mol Na

2.00 g O₂ times (1 mol O₂ / 32 g O₂) = 0.0625 mol O₂

From the balanced equation, 4 moles of Na react with 1 mole of O₂ to produce 2 moles of Na₂O. This indicates that sodium is the limiting reagent since fewer moles of it are available relative to the stoichiometric requirements. Thus, we can calculate the amount of Na2O produced:

0.174 mol Na times (1 mol Na₂O / 2 mol Na) = 0.087 mol Na₂O

The last step is to convert moles of Na2O to grams using its molar mass (Na₂O has a molar mass of approximately 62 g/mol):

0.087 mol Na₂O times (62 g Na₂O / 1 mol Na₂O) = 5.39 g Na₂O

Therefore, 5.39 g of Na₂O can be produced by the reaction of 4.00 g of sodium with 2.00 g of oxygen.

Answer:

Since energy cannot be created or destroyed and it can only change form or be transferred from one object to another.

The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another.

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The correct option is option B. All of the energy can be accounted for.

According to the energy conservation principle, no matter how energy is transformed, its overall quantity never changes. Energy can only be changed from one form to another; it cannot be created or destroyed. The law of conservation of energy is the term used to describe this idea.

According to the law of conservation of energy, the total energy before and after conversion is the same.

Therefore, all of the energy involved in a transformation can be accounted for.

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Answer:

Explanation:

a) In an exothermic reaction, the energy transferred to the surroundings from forming new bonds is ___more____ than the energy needed to break existing bonds.  

b) In an endothermic reaction, the energy transferred to the surroundings from forming new bonds is ___less____ than the energy needed to break existing bonds.  

c) The energy change of an exothermic reaction has a _____negative_______ sign.  

d) The energy change of an endothermic reaction has a ____positive________ sign.

The energy changes occur during the bonds formation and bonds breaking.

There are two types of reaction endothermic and exothermic reaction.

Endothermic reactions:

The type of reactions in which energy is absorbed are called endothermic reactions.

In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.

For example:

C + H₂O   →  CO  + H₂

ΔH = +131 kj/mol

it can be written as,

C +  H₂O  + 131 kj/mol  →  CO  + H₂

Exothermic reaction:

The type of reactions in which energy is released are called exothermic reactions.

In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.

For example:

Chemical equation:

C + O₂   →  CO₂

ΔH = -393 Kj/mol

it can be written as,

C + O₂   →  CO₂ + 393 Kj/mol

Answer:

Explanation:

Isotopes, by definition, are a set of elements having the same Atomic No. (# protons) but different Atomic Masses due to variations in number of neutrons.

Isotope       #p⁺       #n°    #e⁻ (neutral element)

C-12               6         6            6

C-13               6         7            6

C-14               6         8            6

Answer:

A gamma rays

Explanation:

Gamma rays unlike beta and alpha particles releases energy and they are actual rays and not particles.

A gamma ray is  form of electromagnetic radiation with no mass and charge. Its energy could range from 10KeV to 3MeV.

Its range is not definite in any medium but much longer than those of alpha and beta particles. Intensity of the rays diminishes exponentially from the source.

Answer:

Nickel is extracted from nickel oxide by reduction with carbon. Nickel is a metal which react with atmospheric oxygen which is very reactive in order to protect the inner surface of metal. Carbon extract oxygen which is attached to the nickel in the form of nickel oxide because carbon is more reactive so it made a chemical bonds with oxygen and nickel oxide is converted into a pure nickel.

Carbon is used to extract nickel from nickel oxide because carbon acts as a reducing agent. During the reduction reaction, carbon reacts with nickel oxide to form nickel and carbon dioxide. Carbon's greater affinity for oxygen allows it to remove oxygen from nickel oxide, leaving nickel.

Carbon can be used to extract nickel from nickel oxide because of its ability to act as a reducing agent. In this context, a reducing agent is a substance that donates electrons to another substance, in this case, nickel oxide. This reduction reaction involves carbon reacting with nickel oxide to form nickel and carbon dioxide. Carbon, having a greater affinity for oxygen than nickel, binds with the oxygen in the nickel oxide forming carbon dioxide and leaving the nickel behind. This process is commonly used in metal extraction from their oxides, especially those of less reactive metals like nickel.

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