What happens to particles when they are heated?

a they speed up and spread out
b they stop moving
c they slow down and compress
d they move closer together and speed up

Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

Answer:

Zn²⁺ gets reduced

Explanation:

An electrolytic cell runs in the opposite direction of a galvanic cell. Applying a current to the galvanic cell Zn | Zn²⁺ || Ni²⁺ | Ni would convert the Zn anode to a cathode and cause Zn²⁺ to be reduced.

Answer:

(d) on the left side ,because it is a reactant.

Answer:

(D) On the left side, because it is a reactant.

Answer: The texture is one of the most important physical characteristics of the solid or liquid materials.

Texture is actually the physical feel of the surface layer of a material when we physically touch it.

So,by it's definition we came to know that the texture is only possible for the substances which have physical surfaces.

And the gaseous materials don't have any physical surface to feel it's texture.

That's why gaseous materials including hydrogen gas don't have any kind of texture.

Explanation:

Direct expansion systems require the vapour exiting the evaporator to be superheated to avoid liquid slugging, to improve the effectiveness of the evaporator and to maintain the stability of the compressor. (B) Forced draft and induced draft evaporators differ in the way air is introduced into them. (C) CClF2CF3 (also known as R12) is a chlorofluorocarbon refrigerant. (ii) Tetrafluoroethane (also known as R134a) is a hydrofluorocarbon refrigerant and H2O is not classified as a refrigerant. (D) The partial pressure of hydrogen in the evaporator is 1.6 mmHg.

(a) Direct expansion systems are those in which the refrigerant in the evaporator evaporates directly into the space to be cooled or frozen. The evaporator superheat is used to make sure that only vapor and no liquid is carried over into the suction line and compressor. Superheating is required for the following reasons :

(b) Forced draft and induced draft evaporators differ in the way air is introduced into them. In an induced draft evaporator, a fan or blower is positioned at the top of the evaporator, and air is drawn through the evaporator from the top. In a forced draft evaporator, air is propelled through the evaporator by a fan or blower that is located at the bottom of the evaporator. Forced draft evaporators are frequently used in direct expansion systems because they allow for better control of the air temperature. Because the air is directed upward through the evaporator and out of the top, an induced draft evaporator is less effective at keeping the air at a uniform temperature throughout the evaporator.

(c) (i) CClF2CF3 (also known as R12) is a chlorofluorocarbon refrigerant.

(ii) Tetrafluoroethane (also known as R134a) is a hydrofluorocarbon refrigerant.

(iii) H2O is not classified as a refrigerant.

(d) The function of hydrogen gas in an absorption refrigeration system (NH3/H2O/H2) is to increase the heat of reaction between ammonia and water.

The pressure of hydrogen gas in the evaporator of an absorption refrigeration system can be determined using the formula, Pa/Pb = (Ta/Tb)^(deltaS/R),

where Pa = partial pressure of hydrogen in the evaporator, Ta = evaporating temperature, Tb = condensing temperature, Pb = partial pressure of hydrogen in the absorber, deltaS = entropy change between the absorber and evaporator, R = gas constant.

Substituting the given values, Ta = −2.0 ∘C = 271 K ; Tb = 38.0 ∘C = 311 K ; Pb = atmospheric pressure = 1 atm ;

deltaS = 4.7 kJ/kg K ; R = 8.314 kJ/mol K

we get, Pa/1 atm = (271/311)^(4.7/8.314)

Pa = 0.021 atm or 1.6 mmHg

Therefore, the partial pressure of hydrogen in the evaporator is 1.6 mmHg.

Thus, Direct expansion systems require the vapour exiting the evaporator to be superheated to avoid liquid slugging, o improve the effectiveness of the evaporator and to maintain the stability of the compressor. (B) Forced draft and induced draft evaporators differ in the way air is introduced into them. (C) CClF2CF3 (also known as R12) is a chlorofluorocarbon refrigerant. (ii) Tetrafluoroethane (also known as R134a) is a hydrofluorocarbon refrigerant and H2O is not classified as a refrigerant. (D) The partial pressure of hydrogen in the evaporator is 1.6 mmHg.

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An exothermic process is one that gives off heat.

Explanation:

This heat is transferred to the surroundings. An endothermic process is one in which heat has to be supplied to the system from the surroundings.

Ethanol is produced when ethane and ethene react with water and a catalyst like sulfuric acid. Adding concentrated sulfuric acid to hot ethanol (acts as a catalyst).

To eliminate carbon dioxide and sulphur dioxide that are created as byproducts, the gases are passed through a sodium hydroxide solution. The main product that is gathered over water is ethene. As a result, dehydration of ethanol produces ethene rather than ethane. The names Mattling acid and Oil of Vitriol are other names for sulfuric acid. It is highly caustic and acidic in nature. It dehydrates and oxidises when  present in higher amounts. It is a clear, syrup-like liquid with no colour or smell. A substance having the chemical formula C 2H 6, ethane is an organic chemical.

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Explanation:

We can tell if a chemical reaction has taken place when one or more of the following things happen:

1.There has been a colour change inside the reaction flask.

2. A gas has formed. Usually we know a gas has formed when we can see bubbles.

3.A solid has formed.

hope this answer helps!!!

Explanation:

A Chemical Reaction Is Usally Accompaneid by easly observed physical effects such as the emissions of heat and light the information of a precipitate the evaluation of gas,or a color change

Answer:Newton’s first law

Explanation:

I believe it is D because a combustion reaction produces carbon dioxide (CO2) and water (H2O)

That the calculated molar mass of the gas is closest to the molar mass of N2O. Therefore, the gas is most likely N2O.

What is Density?

Density is a physical property of matter that describes how much mass is contained in a given volume. It is defined as the amount of mass per unit volume, and is typically expressed in units of grams per cubic centimeter (g/cm3) or kilograms per cubic meter (kg/m3).

The gas density and the conditions provided can be used to calculate the molar mass of the gas using the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Rearranging this equation to solve for n/V, we get:

n/V = P/RT

M = m/n

where M is the molar mass, m is the mass of the gas, and n is the number of moles.

Since the density is given in grams per liter, we can assume that 1 liter of the gas has a mass of 1.96 grams. Therefore, the number of moles of the gas in 1 liter can be calculated as:

n/V = P/RT = (1 atm)/(0.08206 L·atm/mol·K × 273 K) = 0.0446 mol/L

The number of grams of the gas in 1 liter can be calculated as:

m = density × volume = 1.96 g/L × 1 L = 1.96 g

Therefore, the molar mass of the gas is:

M = m/n = 1.96 g / 0.0446 mol = 43.9 g/mol

Comparing this molar mass to the molar masses of the possible nitrogen oxides:

NO has a molar mass of 30.01 g/mol

N2O4 has a molar mass of 92.01 g/mol

N2O has a molar mass of 44.01 g/mol

We can see that the calculated molar mass of the gas is closest to the molar mass of N2O. Therefore, the gas is most likely N2O.

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Answer:

b

Explanation:

Answer:

B

Explanation: All answers are true

Among the given options, the form that would not insure against external explosion is d) unendorsed DP-1.  option d

To understand why, let's first clarify the terms used in the options. DP stands for Dwelling Property, which is a type of insurance policy that covers residential properties. The numbers 1, 2, and 3 refer to different forms or levels of coverage provided by the insurance policy.

In the case of an external explosion, it typically refers to an explosion that occurs outside the insured property and causes damage to the property. This can include explosions from nearby buildings, gas leaks, or other external sources.

Now, looking at the options:

a) Endorsed DP-1: This indicates that the DP-1 policy has been endorsed or modified to include additional coverage. Depending on the specific endorsement, it may or may not cover external explosions. Therefore, it is possible that an endorsed DP-1 could provide coverage against external explosions if the endorsement includes such coverage.

b) DP-2: The DP-2 form is a broader form of coverage compared to DP-1. It typically covers a wider range of perils, including external explosions. Therefore, DP-2 is more likely to provide coverage against external explosions.

c) DP-3: The DP-3 form is the broadest and most comprehensive form of coverage among the three. It typically covers a wide range of perils, including external explosions. Therefore, DP-3 is likely to provide coverage against external explosions

d) Unendorsed DP-1: This refers to a standard DP-1 policy without any additional endorsements or modifications. The unendorsed DP-1 policy is typically the most basic form of coverage and may have limited coverage options. It is less likely to include coverage for external explosions unless specifically mentioned in the policy.

Option d

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Answer:  The cell size difference occur as a result of osmotic pressure imbalance between the cell and the salt solution.

Explanation:

Answer:

sulfur and water

Explanation:

sulfur + water --> sulfuric acid

^ reactants. ^ product

Answer:

I think 1.67 x 10^20

Explanation:

Answer: V = 5.60 L

Explanation:

At STP (standard temperature and pressure) are the following values.

T = 273K of 0°C

P = 1.00 atm

R is the gas constant.

R = 0.08206 L atm/K mol

To find the volume in liters we will use PV = nRT.

Step 1: Convert 8.00 g O₂ to moles O₂.

8.00 g O₂ x (1 mol O₂/32.00 g O₂) = 0.250 mol O₂

Step 2: Rearrange PV = nRT to isolate V.

V = nRT/P

Step 3: Insert the known values into the equation and solve for V.

V = [(0.250 mol O₂) x (0.08206 L atm/ K mol) x 273K] / 1.00 atm

V = 5.60 L

Note that all units cancel except for L.

Answer:

As scientist discovered that Science is the method of learning everything about the natural world.

An important role in science is to ask questions to get much more know to the topic.

Science is important to the natural world.

Science is the systematic study of the natural world through observation, experimentation, and analysis, aiming to understand its underlying principles and laws.

Science is the systematic and empirical study of the natural world and its phenomena through observation, experimentation, and the formulation of testable hypotheses. It aims to uncover the underlying principles and laws that govern the universe and provides a methodical approach to understanding, explaining, and predicting various aspects of the world around us. Science covers a wide range of disciplines, from physics and chemistry to biology, psychology, and beyond, and it plays a crucial role in advancing knowledge, technology, and society.

Science is important because it drives progress, expands knowledge, and improves lives by providing evidence-based solutions to complex problems. It fosters innovation, informs decision-making, and enhances our understanding of the universe and ourselves.

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A voltage is generated between the two cell halves in the \(Zn/Zn^{2+}\)concentration cell. The electrode with the increased concentration of \(Zn^{2+}(1.0 M)\) will be oxidized, while \(Zn^{2+}\) the electrode with the lower concentration of \(Zn^{2+}(10^{-2} M)\) will be reduced.

In a concentration cell, the difference in ion concentration between two electrodes produces a potential difference or voltage. In this case, both electrodes are pure zinc (Zn), and the \(Zn^{2+}\) concentration differs between the two cell halves.

The cell reaction can be depicted as follows:

Zn(s) → \(Zn^{2+}\)(1.0 M) + 2e-  (oxidation at the electrode with 1.0 M \(Zn^{2+}\))

Zn(s) + 2e- → \(Zn^{2+}(10^{-2} M)\) (reduction at the electrode with 10-2 M Zn2+)

The Nernst equation can be utilized to calculate the Ecell.

Ecell = E°cell - \((\frac{RT}{nF}) ln(Q)\)

where:

E°cell=standard cell potential = 0 V

R = gas constant (8.314 J/mol·K)

T = 25°C = 298 K

n = number of electrons transferred = 2

F = Faraday constant = 96,485 C/mol

Q = reaction quotient = ratio of concentrations of \(Zn^{2+}=(\frac{1.0 M}{10^{-2} M})\)

We know that the E°cell is 0 V and the logarithm of Q will be greater than 0 as \((\frac{1.0 M}{10^{-2} M})\) is greater than 1. So, the product of (RT/nF) and ln(Q) will also be positive. Therefore, a voltage is generated between the two cell halves.

So, the electrode with the increased concentration of \(Zn^{2+}(1.0 M)\) will be oxidized, while \(Zn^{2+}\) the electrode with the lower concentration of \(Zn^{2+}(10^{-2} M)\) will be reduced.

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The green laser beam carries more energy per photon compared to the red laser beam.

The energy of a photon is determined by its frequency, according to the equation E = hf, where E represents energy, h is Planck's constant, and f denotes the frequency of the photon.

As frequency increases, energy also increases.

Green light has a higher frequency than red light in the visible spectrum.

Therefore, green photons possess more energy per photon compared to red photons. This higher energy can be observed in various applications such as laser technology.

Green lasers typically emit light with a higher energy level per photon compared to red lasers.

It is important to note that even though green light carries more energy per photon, the total energy output of a laser is determined by the power or intensity of the laser beam, which is a function of both energy per photon and the number of photons emitted per second.

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The lipid whose structure is similar to a triglyceride except that one fatty acid is replaced with a compound containing phosphorus and nitrogen is called a phospholipid. Here Phospholipid is the lipid whose structure is similar to a triglyceride except that one fatty acid is replaced with a compound containing phosphorus and nitrogen.

Phospholipids are essential components of the cell membrane and are made up of a hydrophilic (water-loving) head and a hydrophobic (water-fearing) tail. They help keep the cell membrane intact and control what enters and exits the cell.Triglycerides are made up of three fatty acid chains connected to a glycerol backbone. They store energy and make up the majority of dietary fats. A phospholipid, on the other hand, has a hydrophilic phosphate head, a glycerol backbone, and two hydrophobic fatty acid tails.

Phospholipids are the main components of cell membranes, with the hydrophobic tails facing inward towards the middle of the membrane and the hydrophilic head facing outward.Phospholipids are also amphipathic, meaning they have both hydrophobic and hydrophilic regions. They are therefore well-suited for forming bilayers, which are two layers of phospholipids arranged tail-to-tail. This arrangement enables cells to separate their internal environment from the external environment and control what passes through the membrane.

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The first person to use heating processes to preserve foods was Nicholas Appert. He discovered that food can be kept from spoiling by heating it and sealing it in airtight containers.

Nicholas Appert, a French confectioner, invented the method of canning food in 1809. He conducted a series of experiments to find a way to preserve food for long periods without it spoiling. Appert discovered that food can be kept from spoiling by heating it and sealing it in airtight containers.

He used glass jars with cork stoppers, which he sealed with wax and then boiled. Appert's invention was later improved by others, such as Louis Pasteur, who showed that the process of heating kills microorganisms that cause food to spoil. Today, canning is a common method used to preserve food, and it is used to produce a variety of food products, including fruits, vegetables, meats, and fish.

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Answer:

the kittens received half of their DNA from the mother cat

Answer:

C) the kittens received half of their genetic information from the mother cat

Explanation:

1. there was another answer

2. I took the test and I got 100% by choosing this answer

Have a good day!! :DD

Answer:

He has a deep respect for the horse,so he treats him with care

Answer:

It's C

Explanation:

Good luck on the test.

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 4.75 g

volume = 0.5325 cm³

We have

\(density = \frac{4.75}{0.5325} \\ = 8.920187\)

We have the final answer as

Hope this helps you

when molten CaF2 is electrolyzed by a current of 9.55 A for 19 h, approximately 136 g of calcium metal is produced.

To determine the mass of calcium produced when molten CaF2 is electrolyzed by a current of 9.55 A for 19 h, we'll use Faraday's Law of Electrolysis.

First, calculate the total charge passed through the electrolyte:
Charge (Q) = Current (I) × Time (t)
Q = 9.55 A × (19 h × 3600 s/h) = 653,940 C

Next, determine the number of moles of electrons (n):
n = Q / (Faraday constant F)
n = 653,940 C / (96,485 C/mol) ≈ 6.77 mol

The balanced equation for the electrolysis of CaF2 is:
2F- → F2 + 2e-
Ca2+ + 2e- → Ca

The mole ratio between calcium and electrons is 1:2. So, the number of moles of calcium produced is:
Moles of Ca = 0.5 × Moles of electrons
Moles of Ca = 0.5 × 6.77 mol ≈ 3.39 mol

Finally, calculate the mass of calcium:
Mass of Ca = Moles of Ca × Molar mass of Ca
Mass of Ca = 3.39 mol × 40.08 g/mol ≈ 136 g

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