be sure to answer all parts. classify each process as exothermic or endothermic: freezing of water (select) boiling of water (select) break down of food during digestion (select) a person running (select) a person growing (select) turning graphite into diamond (select) heating with a furnace

Answer: But Thats Aight

Explanation: 301

Answer:

197.98g

Explanation:

This question can be calculated using the formula: Q = mcΔT

Where Q= heat transfer

M= mass

C= specific capacity

ΔT= change in temperature

Heat from the copper metal is lost to the water when placed in it, hence, we have:

Q(water) = -Q(copper)

The final temperature of the water is equally to the final temperature of the copper= 22.87°C.

Hence, mcΔT (water) = (-) mcΔT (copper)

Note that, specific heat (C) of water and copper are 4.184 J/g°C and 0.385 J/g°C respectively.

Therefore;

= (m) (4.184) (22.87-21.65) = - {(35.41) (0.385) (22.87-97)}

= m × 4.184 × 1.22 = - {35.41 × 0.385 × -74.13)}

5.10448m = - {-1010.6031}

5.10448m = 1010.6031

m = 1010.6031 ÷ 5.10448

m = 197.98

Therefore, the mass of water copper was added to is 197.98g

The formula unit for the equation when potassium sulfate and barium chloride are mixed to form potassium chloride and barium sulfate would be: \(K_2SO_4 (aq)+ BaCl_2 (aq) --- > 2KCl (aq) + BaSO_4 (s)\). Option 4.

The chemical equation of reactions can be derived from the chemical formula of each participating species of the reaction. Thus, when potassium sulfate and barium chloride are mixed to form potassium chloride and barium sulfate, the chemical equation can be derived as follows:

Chemical formula of potassium sulfate = \(K_2SO_4\)

Chemical formula of barium chloride = \(BaCl_2\)

Chemical formula of potassium chloride = \(KCl\)

Chemical formula of barium sulfate = \(BaSO_4\)

The reaction is a double decomposition reaction and can also be a precipitation reaction because one of the salts formed, barium sulfate is an insoluble salt.

The overall equation of the reaction, can thus, be written as \(K_2SO_4 (aq)+ BaCl_2 (aq) --- > 2KCl (aq) + BaSO_4 (s)\)

More on chemical equation of reactions can be found here: https://brainly.com/question/28294176

#SPJ1

Answer:

It is diffusion

Explanation:

Diffusion occurs when particles move from relatively high concentration to relatively low

Answer:

it is diffusion

Explanation:

smoke rises from one corner of the room and spreads to the rest of the room, resulting in diffusion

\((115.00)(0.25)+(117.00)(0.75)=\boxed{116.50 \text{ u}}\)

Molality of a solution is defined as the number of moles of solute per kilogram of solvent. The formula for molality is given by the following equation:molality (m) = moles of solute / mass of solvent (in kg)In order to calculate the molality of a 12 percent urea solution, we need to first determine the mass of urea present in the solution.

For such more question on moles

https://brainly.com/question/29367909

#SPJ8

Answer:

La distancia recorrida por el móvil es 228.600 m

Explanation:

El movimiento rectilíneo uniforme MRU es el movimiento que describe un cuerpo o partícula a través de una línea recta a velocidad constante. Es decir:, en este caso el movimiento es lineal en una única dirección  y la velocidad de desplazamiento es constante.

La velocidad es una magnitud física que expresa la relación entre el espacio recorrido por un objeto y el tiempo empleado para ello mediante la expresión:

\(velocidad=\frac{distancia}{tiempo}\)

En este caso:

Reemplazando:

\(25 \frac{m}{s} =\frac{distancia}{9144 s}\)

y resolviendo obtienes:

distancia= 25\(\frac{m}{s}\) *9144 s

distancia= 228.600 m

La distancia recorrida por el móvil es 228.600 m

A movement is rectilinear uniform when an "object" (for example) travels in a straight path at a constant speed, given that its acceleration is zero.

Velocity (v) = 25m/s

Distance (d) = ?

Time (t) = 2.54hr = 9,144 s

Looking at the data, we see that the time is in hr, but we need it in seconds. Therefore we do a conversion from hours to minutes, taking into account that 1 hour is equal to 3600 seconds.

To calculate the distance traveled by the mobile, the speed is multiplied by the time taken.

For this the following formula is applied:

We apply the data in the formula; to solve for the distance.

Answer: The distance traveled by the mobile is 228,600 meters.

It is necessary to cool the mixture to room temperature before transferring it to the separatory funnel and adding dichloromethane in the caffeine extraction lab because dichloromethane is a volatile solvent that can evaporate quickly. If the mixture is still hot, the dichloromethane may evaporate before it has a chance to fully mix with the mixture, which can affect the efficiency of the extraction process. Cooling the mixture to room temperature also helps to prevent any unwanted reactions or changes in the mixture that could occur at higher temperatures.

In the caffeine extraction lab, it is necessary to cool the mixture to room temperature before transferring it to the separatory funnel and adding dichloromethane for the following reasons:

1. Safety: Cooling the mixture to room temperature minimizes the risk of harmful vapors being released or the possibility of a violent reaction when adding dichloromethane.

2. Solubility: Cooling the mixture to room temperature helps to improve the separation of caffeine from other components by reducing the solubility of caffeine in the water layer, which increases the efficiency of the extraction process using dichloromethane.

3. Preventing loss of dichloromethane: Dichloromethane has a relatively low boiling point (40°C or 104°F). If the mixture is not cooled, some of the dichloromethane could evaporate during the extraction process, reducing its effectiveness.

By following these steps and cooling the mixture to room temperature before transferring it to the separatory funnel and adding dichloromethane, you ensure a safer, more effective caffeine extraction in the lab.

Learn more about  caffeine extraction at https://brainly.com/question/11060225

#SPJ11

Answer:

The charge of a Strontium atom that has 10 electrons is 4.48 × 10⁻¹⁸ C

Explanation:

The atomic number of Strontium is 38

The electronic configuration of Strontium is given as follows;

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²

The atomic number of Strontium is 38 electrons in orbit and 38 protons in its nucleus and is electronically neutral

38e⁻ + 38e⁺ = 0

When there are only 10 electrons in an atom of Strontium, we have;

10e⁻ + 38e⁺ = +28e

The charge of a Strontium atom that has 10 electrons is +28e

+28e = 28×1.6×10⁻¹⁹ C = 4.48 × 10⁻¹⁸ C

The charge of a Strontium atom that has 10 electrons is +28e or 4.48 × 10⁻¹⁸ C.

Heat transfers from object A to object B, because molecules from A collide with those from B. Option 1.

Heat always flows from an object at a higher temperature to an object at a lower temperature. When two objects at different temperatures are in contact with each other, their molecules collide, and this collision transfers energy from the hotter object to the colder object.

As a result, the hotter object loses heat, and the colder object gains heat. This process will continue until the two objects reach thermal equilibrium, meaning that they have the same temperature and there is no more net heat transfer between them.

Therefore, in the given scenario, object A, which is hotter, will transfer heat to object B, which is colder, as the molecules from object A collide with those from object B.

More on heat transfer can be found here: https://brainly.com/question/13433948

#SPJ1

Answer:

Heat transfers from object A to object B, because molecules from A collide with those from B.

Explanation:

Answer: Kansas City Chiefs

Explanation: what ever you think.

The amount of heat that is needed to change 250.0 grams of water at 80°C to steam at 100°C is 20900 J of heat.

Heat change is the amount of heat that must be added or that is evolved when a particular change occurs in a substance.

The amount of heat required is determined from the formula of heat given below as follows:

Heat change = mass * specific heat capacity * temperature change

Heat required = 250 * 4.18 * (100 - 80)

Hee=at required = 20900 J

Learn more about heat change at: https://brainly.com/question/28912732

#SPJ1

False, Asbestos is a naturally occurring mineral fiber that was commonly used in various industries due to its heat resistance, strength, and insulating properties.

Asbestos does not necessarily need to be removed if it will not be disturbed or pose a risk to human health. Asbestos-containing materials that are in good condition and undisturbed are generally considered safe. However, if asbestos-containing materials are damaged, deteriorating, or will be disturbed during renovation or demolition activities, it is necessary to take appropriate precautions, which may include professional removal or encapsulation, to prevent the release of asbestos fibers into the air. The decision to remove asbestos should be based on an assessment of its condition, potential for disturbance, and adherence to local regulations and guidelines.

To know more about Asbestos, click here, https://brainly.com/question/8853025

#SPJ11

The rate of reaction r is measured by the amount of gas produced at a 10-second interval.

in this reaction magnesium and acids are gradually used up. however acid is in excess so it is mainly a loss of magnesium. that causes a change in the rate.

if the graph of the axis is in y and time in the x-axis. this shows this reaction fastest at the beginning. as the magnesium is used up the rate falls. when the reaction has stopped no more gas is produced.

To learn more about reaction rate, refer;

https://brainly.com/question/13440548

#SPJ9

Answer:

Yes, alluminium is a metal and it also possess all these properties

Answer:

Thats potassium (k)

Explanation:

Answer:

c

Explanation:

Alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.

The easiest category of hydrocarbons would be the alkanes. They exclusively possess hydrogen as well as carbon. So every hydrogen atom produces one link, while each carbon atom generates four.

When all of a hydrocarbon's carbon-carbon bonds possess single bonds, the hydrocarbon was said to have been saturated. A hydrocarbon would be an organic substance with only carbon as well as hydrogen as its components.

Therefore, alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.

To know more about alkanes and hydrocarbons.

https://brainly.com/question/16995585

#SPJ3

Answer:

Power = 1011.2 Watts

Explanation:

Given the following data;

Voltage = 128 Volts

Current = 7.9 Amperes

To find the power rating;

Mathematically, the power rating of an electrical device is given by the formula;

Power = current * voltage

Power = 128 * 7.9

Power = 1011.2 Watts

The correct statement about an electrochemical cell is that electrons move through the solution attached to the ions.

In an electrochemical cell, there are two half-cells: an oxidation half-cell (anode) and a reduction half-cell (cathode). The oxidation half-cell involves the loss of electrons, and the reduction half-cell involves the gain of electrons.

During the operation of the cell, electrons flow from the anode to the cathode through an external circuit, creating an electric current. Within the solution, the movement of electrons is facilitated by the presence of ions. The ions act as carriers of charge, and the electrons are attached to these ions as they move through the solution.

The other statements are not correct. Electrons do not move through the porous barrier, rather they flow through the external circuit. Positive ions do move through the porous barrier, but they move from the anode to the cathode, not toward the cathode.

Conduction in an electrochemical cell is not due to the movement of water molecules but rather the movement of charged particles (ions and electrons) within the cell.

Learn more about Electrochemical Cell here:

brainly.com/question/29470878

#SPJ11

The pressure exerted by the neon gas, when the volume is increased from 7.2 mL to 28.8 mL at constant temperature, can be calculated using Boyle's Law. The pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

Boyle's Law states that at constant temperature, the product of the pressure and volume of a gas remains constant. Mathematically, it can be expressed as P₁V₁ = P₂V₂. This law allows us to calculate the change in pressure when the volume changes.

In this case, the initial volume (V₁) is given as 7.2 mL, and the initial pressure (P₁) is 1.5 atm. The final volume (V₂) is 28.8 mL. By substituting these values into Boyle's Law equation, we can solve for the final pressure (P₂).

When we perform the calculations, we find that the pressure exerted by the neon gas, when the volume is increased to 28.8 mL, is 0.375 atm. As the volume increases, the pressure decreases due to the inverse relationship between pressure and volume.

Using Boyle's Law: P₁V₁ = P₂V₂

Given:

Initial volume (V₁) = 7.2 mL

Initial pressure (P₁) = 1.5 atm

Final volume (V₂) = 28.8 mL

To find the final pressure (P₂):

P₂ = (P₁ * V₁) / V₂

  = (1.5 atm * 7.2 mL) / 28.8 mL

  = 0.375 atm

Therefore, the pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

for such more questions on  pressure

https://brainly.com/question/24719118

#SPJ8

Answer:

Hello There!!

Explanation:

I believe the answer is O They form compounds with very bright colors.

hope this helps,have a great day!!

~Pinky~

The statement about noble gases that is correct is D. They form compounds with very bright colors.

Noble gases simply refers to the elements that have similar properties. Noble gases are colorless, odorless, and have very low reactivity.

Examples of noble gases are helium, argon, Krypton, xenon, etc. Noble gases also form compounds with very bright colors.

In conclusion, the correct option is D.

Read related link on:

https://brainly.com/question/24070118

Answer:

they are only efficient in certain areas

Explanation:

Wind turbine are efficient only in certain areas it is a problem with using wind turbines to produce energy.

Wind turbine convert the wind energy into the electricity. It is a power generating device that converts the kinetic energy in to electrical energy.

Now lets check all option one by one:

Option (A): Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.

So, it is correct option.

Option (B): Wind turbines occupy a lot of space to work.

So, it is incorrect option.

Option (C): Wind turbines produce a large amount of energy is not a problem.

So, it is incorrect option.

Option (D): Wind turbines does not create a pollution or it does not pollute the air or water.

So, it is incorrect option.

Thus, we can say that Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.

Learn more about the Wind turbines here: https://brainly.com/question/883099
#SPJ2

Without the specific phase diagram and compositions, it's impossible to provide a numerical value for the activity of Pb for the tangent.

To determine the activity of Pb in systems with given compositions at 200°C using the common tangent construction, follow these steps:

1. Obtain a phase diagram: First, find a Pb-rich phase diagram that includes temperature (T) and composition (X) axes. Make sure the diagram has data for 200°C.

2. Locate the compositions: Identify the compositions given in the question on the phase diagram. For example, if you are given compositions X1 and X2, find those points on the diagram.

3. Draw the common tangent: Draw a tangent line that touches both of the curves corresponding to the compositions X1 and X2 at 200°C. This common tangent line represents the equilibrium state between the two phases at the given temperature.

4. Identify the point of tangency: Locate the point where the tangent line touches the curve for the composition X1. This point represents the equilibrium composition of Pb in that phase.

5. Determine the activity of Pb: Based on the equilibrium composition at the point of tangency, calculate the activity of Pb using the given activity-composition relationship or activity coefficient model (e.g., Raoult's Law or Henry's Law).

Without the specific phase diagram and compositions, it's impossible to provide a numerical value for the activity of Pb. However, these steps should guide you in solving the problem using the common tangent construction method.

Learn more about tangent here:

https://brainly.com/question/24595178

#SPJ11

Answer:

The fly cells must be compared with human cells

Explanation:

Dr. Gracia's aim is the development of a potential cancer treatment. Remember that the treatment is meant for human beings.

Usually, the pre-clinical trials of the treatment is carried out on other organisms and the success rate is evaluated before trial on humans.

If protein W has been effective on flies, its effect on human cells should also be diligently compared before conclusions are drawn regarding the therapeutic effects of protein W.

Answer:

Cell theory states that cell living organisms are composed of at least one cell, which are the basic unit of life. Cells are always produced from other living cells, and cannot spontaneously generate

Answer:

Explanation:

Molecular weight of Al: 27

Molecular weight of O: 16

Percentage composition of Al by weight in Al2O3

= (27*2) / (27*2 + 16*3)

= 0.5294

In 200 grams of Al2O3, there are

= 200*0.5294

= 105.88 grams of Al

77.18 grams of Al was produced in the experiment.

Percent yield for the experiment

= product mass / reactant mass * 100%

= 77.18 / 105.88 * 100%

= 72.89%

To shed light on the process by which titanium dioxide (TiO2) nanoparticles are formed, titanium tetrachloride (TiCl4) hydrolysis has been investigated.

Hydrogen chloride (HCl) gas, which is extremely caustic and hazardous, is known to be released violently when TiCl4 reacts with water. The estimate of the scope and gravity of the effects of large accidents that have been identified, such as an unintentional spill of TiCl4, is, however, not shared by the industry.

An alternative strategy (which is the opposite of the solution above) would be to assert that since metal chlorides are often ionic, titanium chloride must be a tiny (covalent) molecule with weak molecular interactions if it is a liquid at room temperature.

to know more about  titanium dioxide here:

brainly.com/question/16978406

#SPJ4