Bronze is a combination of two metals, copper and tin. Bronze is an example of a(an) ______. Make sure you have read the etext pages 24-27 in Lesson 2.07


alloy


colloid


ductile


ion

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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The maximum theoretical efficiency possible for the heat engine operating between the reservoir in which the ice and the water coexist, and a reservoir in which water and steam coexist 26.8 %.

The cold reservoir, in which the ice and the water will coexist, is at the freezing point of the water at 1.0 atm:

T₁ = 0°C = 273.15 K

The hot reservoir, in which the water and the steam coexist, is at the boiling point of the water at 1.0 atm:

T₂ = 100 °C = 373.15 K

The heat engine efficiency is as follows :

Theoretical efficiency = 1 - ( T₁ / T₂ )

Theoretical efficiency = 1 - ( 273.15 / 373.15 )

Theoretical efficiency = 0.268

Theoretical efficiency = 26.8 %

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Answer:

Negative

Explanation:

Electron is a subatomic particle with a negative charge of -1e unlike the proton which has a positive charge of +1e

In an atom, an electron has a net negative charge revolving in orbits around the nucleus.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

ano........................................................

In HCFCs, the elements found are hydrogen (H), carbon (C), chlorine (Cl), and fluorine (F).

HCFCs, or hydrochlorofluorocarbons, are a group of chemicals containing specific elements.

These compounds were developed as a more environmentally friendly alternative to CFCs (chlorofluorocarbons) due to their shorter atmospheric lifetime and lower ozone depletion potential.

Bromine and oxygen are not present in HCFCs, so they do not apply to this specific class of compounds.

To recap, the elements found in HCFCs are hydrogen, carbon, chlorine, and fluorine.

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This definition is useful because it allows chemists and scientists to easily convert between the number of moles of a substance and its mass in grams. For example, if you have a substance with a known number of moles, you can easily calculate its mass in grams by multiplying the number of moles by the molar mass of the substance (which can be found on the periodic table). Similarly, if you know the mass of a substance in grams, you can calculate the number of moles by dividing the mass by the molar mass. The fact that 1 mole of carbon atoms has a mass of exactly 12 grams also makes it easy to use carbon as a standard for comparing the masses of other elements or compounds.

Answer:

Same i have headaches daily, maybe from infections such as meningitis or Intracranial pressure that's either too high or too low or id.k.

Answer:

The End Result Of Diffusion Is An Equal Concentration, Or Equilibrium, Of Mocules On Both Sides Of The Membrane.

Explanation:

☺️ Hope It helps Ty.

The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation.

The three main elements of the rock cycle are metamorphism, erosion, and crystallization.

Crystallization:

In the earth or on the surface, magma cools and solidifies to form igneous rocks. Crystallization occurs as the magma cools, resulting in the formation of various crystals at various temperatures. For instance, olivine crystallizes from magma at temperatures substantially greater than those at which quartz does.

Sedimentation and Erosion:

Rocks at the surface of the Earth are broken down into smaller bits through weathering. These sediments are moved from one location to another by erosion in the form of running water, ice, and gravity. The accumulating sediment must be crushed and bonded together in order to form a sedimentary rock.

Metamorphism:

A rock undergoes metamorphosis when it is subjected to intense heat and pressure inside the Earth yet does not melt. The rock's texture and mineral makeup may change as a result of metamorphism. A metamorphic rock may therefore have a new mineral composition or structure.

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To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl

When there are more collisions between the particles and their container, the pressure rises.

At the molecular level, the pressure of a gas depends on the number of collisions its molecules have with the walls of the container. If the pressure on the piston is doubled, the volume of the gas decreases by one-half.

Answer:

The volume required to hold 2.0 moles of the gas is 21 L. This is because the volume of a gas is directly proportional to the number of moles of gas present (provided that the temperature and pressure remain constant). Therefore, if 0.50 moles of gas takes up 10.5 L of space, then 2.0 moles of the gas would take up 2 * 10.5 L = 21 L of space. This proportionality can be expressed mathematically as:

V1/n1=V2/n2

Where V1 and V2 are the volumes of the gases, n1 and n2 are the number of moles of the gases, and the temperature and pressure are constant.

Answer:

The volume required to hold two moles of the gas is 42 L

Explanation:

By using ratio set up of moles and volume;

moles   :    volume

 0.50   :     10.5

   2.0   :        X

Thus X would be equal to:

(2.0 x 10.5)/0.50

= 21/0.50

= 42 L

Let us assume that the bubble is h meters below the surface of the water, and P₀ is the atmospheric pressure.

Pressure only due to water at a depth of h meters would be equal to ρgh. Also, atmospheric pressure would be acting on the bubble. So, the total pressure on the gas bubble at that depth = P₀+ρgh=ρg×10+ρgh=ρg(h+10).

At the surface of water, only atmospheric pressure would be acting on the bubble i.e. P=P₀=ρg×10

As PV = constant, ρg(h+10)×V=ρg10×8V→h+10=80→h=70 meters.

Hence70m is the answer.Answer:

Explanation:

The number of isomers in the alkane family depends on the number of carbon atoms present in the molecule. Alkanes are hydrocarbons with only single bonds between carbon atoms, and they follow the general formula CnH2n+2, where n represents the number of carbon atoms.

For a given number of carbon atoms, the number of isomers increases exponentially. Here are the number of isomers for different numbers of carbon atoms:

1. Methane (CH4): Only one possible structure. No isomers.

2. Ethane (C2H6): Again, only one possible structure. No isomers.

3. Propane (C3H8): There are two possible structures: a straight-chain structure and a branched structure. These are isomers.

4. Butane (C4H10): There are two isomers: two straight-chain structures and one branched structure.

5. Pentane (C5H12): There are three isomers: three straight-chain structures and two branched structures.

6. Hexane (C6H14): There are five isomers: five straight-chain structures and three branched structures.

7. Heptane (C7H16): There are nine isomers: nine straight-chain structures and five branched structures.

As the number of carbon atoms increases, the number of possible isomers increases dramatically. The exact number of isomers for a given alkane can be determined using principles of organic chemistry and structural isomerism. The branching of the carbon chain can lead to different arrangements and configurations, resulting in multiple isomers.

It is important to note that the number of isomers mentioned above represents the structural isomers, where the carbon chain arrangements differ. However, there can also be other types of isomers, such as stereoisomers, for compounds with more complex structures.

The number of isomers continues to increase with larger alkane molecules, making it impractical to list all the possible isomers for higher members of the alkane family. However, the general trend is that as the number of carbon atoms increases, the number of isomers also increases exponentially.

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Based on the given chemical equation: 2KClO₃ → KCl + 3O₂, There are 2 K (potassium) atoms on the left side (2KClO₃), and 1 K atom on the right side (KCl), There are 6 Cl (chlorine) atoms on the left side (2KClO₃), and 1 Cl atom on the right side (KCl), There are 6 O atoms on the left side (2KClO₃), and 6 O atoms on the right side (3O₂), and No, the equation above is not balanced because the number of atoms of each element is not equal on both sides of the equation.

There are 2 potassium atoms on the left side of the equation, since each formula unit of potassium chlorate (KClO₃) contains one potassium atom, and the coefficient "2" in front of KClO₃ indicates that there are 2 moles of KClO₃. There is 1 potassium (K) atom on the right side of the equation, since each formula unit of potassium chloride contains one potassium atom, and the coefficient "1" in front of KCl indicates that there is 1 mole of KCl.

There are 6 chlorine atoms on the left side of the equation, since each formula unit of potassium chlorate (KClO₃) contains one chlorine atom, and the coefficient "2" in front of KClO₃ indicates that there are 2 moles of KClO₃. There is 1 chlorine (Cl) atom on the right side of the equation, since each formula unit of potassium chloride (KCl) contains one chlorine atom, and the coefficient "1" in front of KCl indicates that there is 1 mole of KCl.

There are 6 oxygen (O) atoms on the left side of the equation, since each formula unit of potassium chlorate (KClO₃) contains three oxygen atoms, and the coefficient "2" in front of KClO₃ indicates that there are 2 moles of KClO₃. There are 6 oxygen (O) atoms on the right side of the equation, since each formula unit of oxygen gas (O₂) contains two oxygen atoms, and the coefficient "3" in front of O₂ indicates that there are 3 moles of O₂.

No, the equation above is not balanced. The coefficients in front of the chemical species are not providing an equal number of atoms of each element on both sides of the equation, indicating an unbalanced equation.

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It is clear from the tabular data that, the monkeys in troop 2 were better to avoid predators and more of them  were able to reproduce. Hence, option D is correct.

In the biosphere, not all living things are fit to survive for a longer life time. Most of them are pray of other higher level animals. Some organisms adopt some strategies to hide from their predators and they can survive more.

It is clear from the table that, the monkeys residing in the ground are more prone to the attacks by their predators. Whereas monkeys living in trees can survive more.

In each year the survival rate is increasing for both troop. However the more number of monkeys which can sustain their population is in troop 2. Therefore, option D is correct.

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Answer:

the second one

Explanation:

because there are 3 of Na and one N

Answer:

#2

C2H4 + 3O2 ----> 2CO2 + 2H2O

#3

2FeBr3 + 3H2SO4 ----> Fe2(SO4)3 + 6HBr

#4

2Al + 3F2 -----> 2AlF3

Explanation:

Answer: the answer is not c

Explanation: I don't know the correct answer, but I took the test and I know it is not c

Answer:

b is the answer

Explanation:

bc i said so

Answer:

phosphorus

Explanation:

Mass of sample = 270.4g

To find the mass of a chemical compound, you need to know the chemical formula of the compound, the number of moles and the atomic masses of its constituent elements.

The formula for sodium hydroxide is NaOH, and its molar mass is 23.00 g/mol for Na + 16.00 g/mol for O + 1.01 g/mol for H = 40.01 g/mol.

To calculate the mass of the 6.761-mol sample, we can use the formula:

mass = moles x molar mass

mass = 6.761 mol x 40.01 g/mol

mass = 270.44 g

Therefore, the answer is option B) 270.4 g.

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Answer:

I think that the first one is right(A)

Answer:

A

Explanation:

When heat is added molecules would move faster so like chicken noodle soup when its boiling on the stove it moves fast but when you turn it off the noodles start slowing down so using less heat makes the reaction slow down and cool

Answer:

True

Explanation:

The entropy of a system denoted by S is a thermodynamic function that increases in value when there are more ways to arrange the particles in the system. Some spontaneous chemical processes are entropy driven. An increase in entropy is said to drive the dissolution of ionic salts along with the evaporation of water are related to the spreading out of energy.

The entropy of a system can be taken as a measure of disorder of a system. In a spontaneous chemical process, the entropy of the universe is said to increase. ΔSunivu>0. Making the answer true.

Answer:

Polypropylene, also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene. Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar.

Explanation:

To compound the given prescription, 1.08 g of boric acid should be used.

This problem involves calculating the quantity of boric acid needed to compound a prescription for eye drops. The prescription specifies the following ingredients and quantities:

Phenacaine Hydrochloride 1% (E value = 0.2)

Chlorobutanol ½ % (E value = 0.24)

Boric Acid q.s. (E value = 0.52)

Purified Water ad 60

Make isoton. sol.

Sig. One drop in each eye

The notation "q.s." means "quantity sufficient," which indicates that the amount of boric acid needed should be calculated based on its E value, which is 0.52.

The E value represents the amount of an ingredient needed to produce a given effect or function. In this case, boric acid is used as a buffering agent to adjust the pH of the solution.

To calculate the amount of boric acid needed, we can use the following equation:

E value = (mass of ingredient) / (total mass of solution)

Rearranging this equation, we can solve for the mass of boric acid:

mass of boric acid = E value x total mass of solution

Substituting the given values into this equation, we get:

mass of boric acid = 0.52 x 60 g

mass of boric acid = 31.2 g

However, we only need to use enough boric acid to achieve the desired buffering effect. The excess boric acid would be unnecessary and could cause harm to the eyes.

The safe and recommended concentration of boric acid in ophthalmic preparations is 1.8% or less.

To achieve a safe and effective concentration of boric acid in the solution, we can calculate the mass of boric acid needed using the desired concentration and total volume of the solution:

mass of boric acid = 1.8% x 60 g / 100

mass of boric acid = 1.08 g

Therefore, to make an isotonic solution with the desired ingredients and quantities, 1.08 g of boric acid should be used.

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The pH of the solution after the volune of base been added is 1.45

Calculation:-

15 mL of 0.200 M NaOH.

Moles of HBr = 0.200 x 0.020 = 0.004 moles.

Moles of NaOH = 0.200 X 0.015 = 0.003.

moles of HBr after titration = 0.004 - 0.003 = 0.001 moles.

The concentration of HBr after titration = 0.001/0.034 = 0.029M

PH -Log (0.029)

= 1.45

Titration is the slow addition of a solution of known concentration to a known volume of another solution of known concentration until the reaction reaches neutralization. Downtitration is characterized by reducing the dose over time once a specific response has been achieved to maintain a specific response while reducing the risk of side effects or to prevent withdrawal or discontinuation syndrome.

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