Non example of subconsciously ?

Explanation:

A) Heat absorbed by water (Joule)

We can find the heat absorbed by water using this equation:

Q = m * C * ΔT

Where Q is the heat, m is the mass of water, C is the specific heat of water and ΔT is the change in temperature.

We have 3 sets of values, we can get one heat for each trial and then average them.

Trial 1:

m = 9.007 g

C = 4.184 J/(g*C)

ΔT = Tfinal - Tinitial = 31.3 °C - 22.2 °C

ΔT = 9.1 °C

Q1 = m * C * ΔT

Q1 = 9.007 g * 4.184 J/(g*C) * 9.1 °C

Q1 = 342.94 J

Trial 2:

m = 8.811 g

C = 4.184 J/(g*C)

ΔT = Tfinal - Tinitial = 34.0 °C - 22.4 °C

ΔT = 11.6 °C

Q2 = m * C * ΔT

Q2 = 8.811 g * 4.184 J/(g*C) * 11.6 °C

Q2 = 427.64 J

Trial 3:

m = 8.826 g

C = 4.184 J/(g*C)

ΔT = Tfinal - Tinitial = 33.2 °C - 23.7 °C

ΔT = 9.5 °C

Q3 = m * C * ΔT

Q3 = 8.826 g * 4.184 J/(g*C) * 9.5 °C

Q3 = 350.82 J

Average:

Q = (Q1 + Q2 + Q3)/3

Q = (342.94 J + 427.64 J + 350.82 J)/3

Q = 373.8 J ---> Heat absorbed by water

B) Heat lost by metal (Joule):

We placed a hot piece of metal inside the water. The piece of metal got cooled and the water was heated by the metal.

If we neglect the heat that was lost to the surroundings, the amount of heat that the water absorbed is equal to the amount of heat lost by the metal (with different sign).

Qmetal = - Qwater

Qmetal = - 373.8 J

C) Specific heat of the metal (J/g °C)

We can also use the same equation that we used for the water.

Qmetal = m * Cmetal * ΔTmetal

We will have to solve the equation for Cmetal.

Cmetal = Q metal /(m * ΔTmetal)

The average mass of the piece of metal is:

m = 8.881 g

The initial temperature of the piece of metal is:

Tinitial = 100 °C

Trial 1:

Qmetal1 = - 342.94 J

ΔT = Tfinal - Tinitial = 31.3 °C - 100 °C

ΔT = - 68.7 °C

Cmetal1 = Qmetal1 /(m * ΔTmetal)

Cmetal1 = -342.94 J/(8.881 g * (-68.7 °C)

Cmetal1 = 0.562 J/(g°C)

Trial 2:

Qmetal2 = - 427.64 J

ΔT = Tfinal - Tinitial = 34.0 °C - 100 °C

ΔT = - 66.0 °C

Cmetal2 = Qmetal2 /(m * ΔTmetal)

Cmetal2 = -427.64 J/(8.881 g * (-66.0 °C)

Cmetal2 = 0.730 J/(g°C)

Trial 3:

Qmetal3 = - 427.64 J

ΔT = Tfinal - Tinitial = 33.2 °C - 100 °C

ΔT = - 66.8 °C

Cmetal3 = Qmetal3 /(m * ΔTmetal)

Cmetal3 = -350.82 J/(8.881 g * (-66.8 °C)

Cmetal3 = 0.591 J/(g°C)

Average:

Cmetal = (Cmetal1 + Cmetal2 + Cmetal3)/3

Cmetal = (0.562 J/(g°C) + 0.730 J/(g°C) + 0.591 J/(g°C))/3

Cmetal = 0.628 J/(g°C)

Answers:

a) The water absorbed 373.8 J

b) The heat lost by the metal is -373.8 J

c) The specific heat of the metal is 0.628 J/(g°C)

Answer:

D. -80m/s^2

Explanation:

V = u + at

5 = 65 + a (0.75)

0.75a = -60

a = -60/0.75

a = -80m/s^2

Therefore, is decelerating at 80m/s^2

Answer:

\(\boxed {\boxed {\sf D. \ 80 \ m/s^2 \ down}}\)

Explanation:

We are asked to find the acceleration of a skydiver. Acceleration is the change in velocity over the change in time, so the formula for calculating acceleration is:

\(a= \frac{v_f-v_i}{t}\)

The skydiver was initially traveling 65 meters per second, then he slowed down to a final velocity of 5 meters per second. He slowed down in 0.75 seconds.

\(\bullet \ v_f = 5 \ m/s \\\bullet \ v_i= 65 \ m/s \\\bullet \ t= 0.75 \ s\)

Substitute the values into the formula.

\(a= \frac{ 5 \ m/s - 65 \ m/s}{0.75 \ s}\)

Solve the numerator.

\(a= \frac{-60 \ m/s}{0.75 \ s}\)

Divide.

\(a= -80 \ m/s^2\)

The acceleration of the skydiver is -80 meters per second squared or 80 meters per second squared down. The skydiver is slowing down or decelerating, so the acceleration is negative or down.

The reaction between calcium nitrate (Ca(NO₃)₂) and sodium oxalate (Na₂C₂O₄) can be represented by the following chemical equation:

Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2NaNO₃

This is a double displacement reaction, where the calcium ion (Ca²⁺) from calcium nitrate and the oxalate ion (C₂O₄²⁻) from sodium oxalate switch places to form calcium oxalate (CaC₂O₄) and sodium nitrate (NaNO₃). The balanced chemical equation shows that one mole of calcium nitrate reacts with one mole of sodium oxalate to form one mole of calcium oxalate and two moles of sodium nitrate.

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Answer:

466 torr

Explanation:

Step 1: Given data

Step 2: Calculate the final pressure

Since we have a gas changing at a constant temperature, we can calculate the final pressure using Boyle's law.

P₁ × V₁ = P₂ × V₂

P₂ = P₁ × V₁ / V₂

P₂ = 626 torr × 5.00 L / 6.72 L

P₂ = 466 torr

Answer:

In metrology, measurement uncertainty is the expression of the statistical dispersion of the values attributed to a measured quantity.By international agreement, this uncertainty has a probabilistic basis and reflects incomplete knowledge of the quantity value. It is a non-negative parameter.

From the calculation, we now obtain the molarity of the sulfuric acid to be 5.8 Mol/L

The term concentration is defined as the ratio of the number of moles to the volume of the solution. We know that unit of the molarity of the solution is the moles per liters.

We know the following;

Mass of the acid =  571.6 g

Volume of the acid = 1.000 x 10^3 ml or 1 L

Molar mass of the acid = 98.08 g/mol

Hence;

Number of moles of the acid = 571.6 g/98.08 g/mol = 5.8 moles

Molar concentration of acid = 5.8 moles/ 1 L

= 5.8 Mol/L

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Answer:

1. Ice at 0 degrees C.

2. N₂ at STP.

3. N₂ at STP.

4. Water vapor at 150 degrees C and 1 atm.

Explanation:

First, we need to remember that entropy (S) is a measure of how spread out or dispersed the energy of a system is among the different possible ways that system can contain energy. The greater the dispersal, the greater is the entropy.

When the temperature is increased, the energies associated with all types of molecular motion increase. Consequently, the entropy of a system always increases with increasing temperature.

With this in mind, we consider the pairs:

1. Since the ice at 0ºC has a greater temperature than the ice at -40 ºC, the first has the higher entropy.

2. The N₂ at STP (that is, 1 atm and 25 ºC) has higher entropy than N₂ at 0ºC and 10 atm because it has a higher temperature and less pressure, which allows a greater dispersal of energy by the molecules of the gas.

3. The N₂ at STP has a higher entropy since it has a higher temperature than N₂ at 0ºC, even though it the first has a lower volume (24,4 L vs. 50 L).

4. The water vapor at 150 ºC and 1 atm have a higher temperature and a lower pressure. This means that its molecules will have an increased molecular motion than the molecules of water vapor at a lower temperature and higher pressure. Therefore, the first has the highest entropy.

Answer:

C

Explanation:

Answer:

4. Transfer of heat through the movement of particles

Explanation:

because it goes in a circular motion

Answer:

the reactor was overheating

The balanced equation of the reaction is:C5H12 + 8O2 → 5CO2 + 6H2OFrom the equation, it shows that 8 moles of oxygen is needed to burn 1 mole of pentane. The volume of oxygen needed for the entire burning process of 18 grams of pentane in normal conditions is 44.86 L.

First, let's convert 18 grams of pentane to moles using the molar mass of pentane (C5H12) as follows:Mass of pentane = 18 g Molar mass of pentane (C5H12) = 5(12) + 12(1) = 72 g/molNumber of moles of pentane = Mass/Molar mass = 18/72 = 0.25 moles

Now, to find the volume of oxygen needed for its entire burning process in normal conditions, we'll use the Ideal Gas Law equation as follows: n = PV/RT where :n = number of moles of the gas V = volume of the gas (in liters)P = pressure of the gas (in atmospheres)R = Universal Gas Constant = 0.0821 L· atm /K· molT = temperature of the gas (in Kelvin)From the equation, we know that 8 moles of oxygen are needed to burn 1 mole of pentane.

Therefore, the number of moles of oxygen needed to burn 0.25 moles of pentane will be: n = 8 × 0.25 = 2 moles The temperature and pressure are normal conditions, which is 0°C and 1 atm respectively. Let's convert the temperature to Kelvin:T = 0 + 273 = 273 K Substituting the values into the Ideal Gas Law equation gives: P × V = nRT Rearranging the equation gives: V = nRT/P  Substituting the values, we get: V = 2 × 0.0821 × 273/1V = 44.86 L

Therefore, the volume of oxygen needed for the entire burning process of 18 grams of pentane in normal conditions is 44.86 L.

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Answer: electrons

Explanation: An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons.

Answer:

A

Explanation:

Is not my personal answer, but here is what I found.

"This entity has been manually annotated by the ChEBI Team. Potassium chromate is the inorganic compound with the formula (K2CrO4). This yellow solid is the potassium salt of the chromate anion"

Mass can be calculated by using moles which can be further calculated from multiplication of Molarity to volume. Therefore, the molarity of the HCl solution is 3M. the correct option is option C.

Molarity can be calculated by dividing  number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/litre. It measure the concentration of any solute in a solution.

Other concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution

Mathematically,

2HCl + Ca(OH)\(_2\) \(\rightarrow\) CaCl\(_2\) + 2H\(_2\)O

Molarity of HCL× Volume of HCL=Molarity of Ca(OH)\(_2\) ×Volume of  Ca(OH)\(_2\)

Molarity of HCL× 1.00 L=1.50 M× 2.00 L

Molarity =3M

Therefore, the molarity of the HCl solution is 3M. the correct option is option C.

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Quick boiling of water can be related to the hot weather because in high temperature water changes from liquid state to gaseous state.

Water boils quickly when the weather is hot and warm because hot weather has high temperature which leads to the quick evaporation of the water. In hot weather, the liquid water changes into vapor state very quickly as compared to cold temperature.

So we can conclude that Quick boiling of water can be related to the hot weather because in high temperature water changes from liquid state to gaseous state.

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Answer:

Excuse me if i am worng but i think it is B

Explanation:

Answer:

option 4.

organism,organ sytem,organ,tissue,cell.

Answer:

the ice cream falls down..therefore, it's kinetic energy while the melting part is heat energy

Answer:

The correct set of coefficients for the given chemical reaction is 2, 4, 1, 2, which means that you have 2C₁2H₂2011+40₂200₂+114₂0.

Answer:

1.5M

Explanation:

M1V1=M2V2

(0.75M)(100ml)=(M2)(50 ml)

M2= 1.5 M

*Text me at 561-400-5105 for private tutoring if interested: I can do homework, labs, and other assignments :)

Im sorry, but I can not see the attachment... But I can try to help you cheer up! You shouldnt let anyone put you down, and certainly dont let life knock you down. Your strong, brave, and deserve happiness. Stay strong, stay brave, stay unique, stay you.

The right response is an atom with 8 valence electrons, or (c). Because of its stable electron configuration, an atom with an entire octet (8 valence electrons) is not reactive.

Valence electrons range in number from 1 to 8 depending on the element. Bonding: Atoms with 8 valence electrons tend to be more stable. Because they have 8 valence electrons, neon, argon, krypton, and xenon atoms are nonreactive.

The least reactive elements are noble gases. They have eight valence electrons, which fill their outer energy level, and this explains why. Noble gases rarely interact with other elements to form compounds since this is the arrangement of electrons that is the most stable.

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The quantity of heat required to boil 400.1 g of water is approximately 920.0 kJ.

To calculate the quantity of heat required to boil a given amount of water, we can use the formula:

Q = n × ΔH

where Q is the quantity of heat required, n is the number of moles of water being boiled, and ΔH is the enthalpy of vaporization of water.

To calculate the number of moles of water being boiled, we can use the molar mass of water, which is approximately 18.015 g/mol.

n = m/M

where m is the mass of water being boiled, and M is the molar mass of water.

n = 400.1 g / 18.015 g/mol

n = 22.206 mol

Now, we can use the formula to calculate the quantity of heat required:

Q = n × ΔH

Q = 22.206 mol × 40.7 kJ/mol

Q = 920.0 kJ

Therefore, the quantity of heat required is approximately 920.0 kJ.

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Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

Answer:

Salty water

Explanation:

Sorry for wasting your time.

The vapor pressure of Substance X at -115.°C is 0.21 atm if the enthalpy of vaporization of Substance X is 13.0kJmol and its normal boiling point is −75.°C.

To tackle this issue, we want to utilize the Clausius-Clapeyron condition:

ln(P2/P1) = (- ΔHvap/R) * (1/T2 - 1/T1)

where P1 and T1 are the fume tension and temperature at the realized limit, P2 and T2 are the fume strain and temperature at the obscure point, ΔHvap is the enthalpy of vaporization, and R is the gas consistent.

To start with, we want to change the temperatures over completely to Kelvin:

T1 = 198.15 K (limit at - 75°C)

T2 = 158.15 K (given)

Then, we can connect the qualities and address for P2:

ln(P2/1 atm) = (- 13.0 kJ/mol/8.314 J/(mol*K)) * (1/158.15 K - 1/198.15 K)

ln(P2/1 atm) = - 1.568

P2/1 atm =\(e^(- 1.568)\)

P2 = 0.21 atm

The Clausius-Clapeyron condition can be utilized to work out the fume strain of a substance at an obscure temperature utilizing its known enthalpy of vaporization and fume tension at a known temperature. By connecting the qualities and settling, we get a fume strain of 0.21 atm for Substance X at - 115°C. Accordingly, the fume strain of Substance X at - 115.°C is 0.21 atm.

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The given structure contains 6 carbon atoms and 14 hydrogen atoms. Therefore, it is the structure of hexane.

Hexane is a hydrocarbon compound with the chemical formula C₆H₁₄. It belongs to the alkane family, which means it consists of only single bonds between carbon atoms. It is a colorless and odorless liquid at room temperature and is commonly used as a solvent in various industries.

It is a straight chain of six carbon atoms (C) with attached hydrogen atoms (H). Each carbon atom in the chain is bonded to two hydrogen atoms except for the two end carbon atoms, which are bonded to three hydrogen atoms.

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Your question is incomplete, most probably the full question is this:

A. Identify the structure drawn below.

The image is attached below.

Answer

AgNO₃(aq) + KI(aq) ------> AgI(s) + KNO₃(aq)

Explanation

Given unbalanced chemical equation:

AgNO₃(aq) + KI(aq)

The type of chemical reaction above is a double replacement reaction. A reaction in which two compounds react by an exchange of ions to form two new compounds is called a double displacement reaction. One of the two compounds formed is insoluble and the order is soluble.

The balanced chemical equation for the given reaction is:

AgNO₃(aq) + KI(aq) ------> AgI(s) + KNO₃(aq)

The precipitate is the insoluble AgI.