Which of the following is characteristics of non-metals?
A. They're always solid at room temperature
B. They tend to be denser than metals.
C. They're strong conductors of electricity
D. They tend to gain electrons in chemical reactions.

The molecular formula of the chemical substance is C2H3 * 2.068 = C4H6 which is option (c)

The empirical formula of a chemical substance gives the lowest whole-number ratio of atoms in a molecule. The molar mass of a substance is the mass of one mole of the substance. To find the molecular formula of a substance, we need to determine the ratio of atoms in the molecule and compare it to the ratio given by the empirical formula.

The molar mass of the substance is 54.091 g/mol, and the empirical formula is C2H3. To find the molecular formula, we can divide the molar mass by the molar mass of the empirical formula.

54.091 g/mol / (2 x 12.011 g/mol + 3 x 1.008 g/mol) = 54.091 g/mol / 26.042 g/mol = 2.068

Since the ratio of atoms in the molecule is 2.068 times that of the empirical formula, the molecular formula is C2H3 * 2.068 = C4H6 which is option (c)

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Answer:

C4H6 (c)

Explanation:

I took the test

Answer:

H₂SO₄

Explanation:

Hope this helps!

Students who use correct scientific reasoning are Student 1 namely: If the reaction is not allowed to finish, the sodium bicarbonate will not decompose completely, making the final mass higher than the theory.Te corrct amswer is B.

If the sodium bicarbonate is not properly broken down, water and carbon monoxide will not be produced, which can be eliminated to lessen the product's mass. The product will therefore weigh heavier or have a bigger ultimate mass than predicted because of an incomplete reaction.

Given the aforementioned justifications, it is obvious that Student 2 is mistaken in this instance. This is not a scientific explanation in the instance of Student 3 and is merely a wild guess that isn't true in all circumstances.

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The chemical equation is H₂SO₄ → 2H⁺ + SO₄⁻². It gives H⁺ ions in aqueous solution so it is an arrhenius acid.

According to the arrhenius theory acid and base are divided according to their ability to provide H⁺ and OH⁻ ions.

If it dissolve substance in an aqueous solution and it gives H⁺ ions then it means that it is an arrhenius acid.

While dissolve a substance in an aqueous solution and give it gives OH⁻ ions then it means that it is in arrhenius base.

When we dissolve H₂SO₄ in water it dissociates into ions.

The chemical equation for the dissociation is,

H₂SO₄ → 2H⁺ + SO₄⁻²

As we can see that sulphuric acid is providing 2H⁺ ions in the aqueous solution then it means that it is an arrhenius acid.

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Answer:

\(200\; \rm mL\) of neon \(\rm Ne\, (g)\) at \(25^{\circ} \rm C\) and \(1\; \rm atm\) (the second choice) would contain an equal number of gas particles as \(200\; \rm mL\!\) of \(\rm He \, (g)\) at \(25^{\circ} \rm C\!\) and \(1\; \rm atm\!\) (assuming that all four gas samples behave like ideal gases.)

Explanation:

By Avogadro's Law, if the temperature and pressure of two ideal gases is the same, the number of gas particles in each gas would be proportional to the volume of that gas.

All four gas samples in this question share the same temperature and pressure. Hence, if all these gases are ideal gases, the number of gas particles in each sample would be proportional to the volume of that sample. Two of these samples would contain the same number of gas particles if and only if the volume of the two samples is equal to one another.

The second choice, \(200\; \rm mL\) of neon \(\rm Ne\, (g)\) at \(25^{\circ} \rm C\) and \(1\; \rm atm\), is the only choice where the volume of the sample is also \(200\; \rm mL \!\). Hence, that choice would be the only one with as many gas particles as \(200\; \rm mL\!\) of \(\rm He \, (g)\) at \(25^{\circ} \rm C\!\) and \(1\; \rm atm\!\).

Recrystalization will occur.The solution may become too diluted for crystals to form if you add too much solvent. Impurities will be captured by a hastily formed crystal's lattice. The crystals that result will also be smaller.

Recrystallization is a physical process used to separate compounds based on how soluble they are. Heating the material to dissolve the compound with impurities in a mixture of a suitable solvent completes the procedure. We can remove the desired chemical or contaminants from the mixture using this method.

The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. The resulting crystals will also be smaller.

The three main types of recrystallization are;

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The type of reaction is Mg + S → MgS is of synthesis reaction. Therefore, the correct option is option B among all the given options.

A synthesis reaction occurs when multiple chemical species unite to create a more complex product. One of the most typical chemical reactions, it is also known as a direct reaction.

A bigger compound is created when two or maybe more reactants mix. A deconstruction reaction, which occurs when the bonds in a complex product are broken and it separates the product in with its individual components or elements, is the reverse of a synthesis process.  The type of reaction is Mg + S → MgS is of synthesis reaction.

Therefore, the correct option is option B among all the given options.

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To determine the maximum amount of Cr2O3 that can be produced and identify the limiting reagent, we need to compare the amounts of Cr(NO3)3 and Na2O and determine which reactant will be completely consumed.

Given:

Mass of Cr(NO3)3 = 1.75 grams

Mass of Na2O = 1.75 grams

First, we need to convert the masses of Cr(NO3)3 and Na2O to moles using their molar masses.

Molar mass of Cr(NO3)3:

(1 x atomic mass of chromium) + (3 x atomic mass of nitrogen) + (9 x atomic mass of oxygen)

= 1(52.00 g/mol) + 3(14.01 g/mol) + 9(16.00 g/mol)

= 152.00 g/mol

Moles of Cr(NO3)3 = Mass / Molar mass = 1.75 g / 152.00 g/mol

Molar mass of Na2O:

(2 x atomic mass of sodium) + (1 x atomic mass of oxygen)

= 2(22.99 g/mol) + 1(16.00 g/mol)

= 61.98 g/mol

Moles of Na2O = Mass / Molar mass = 1.75 g / 61.98 g/mol

Next, we can determine the stoichiometric ratio between Cr(NO3)3 and Cr2O3 using the balanced chemical equation:

2 Cr(NO3)3 + 3 Na2O -> Cr2O3 + 6 NaNO3

From the balanced equation, we can see that the mole ratio between Cr(NO3)3 and Cr2O3 is 2:1.

Now, we compare the moles of Cr(NO3)3 and Na2O to determine the limiting reagent.

Moles of Cr2O3 that can be produced from Cr(NO3)3 = (Moles of Cr(NO3)3) / 2

Moles of Cr2O3 that can be produced from Na2O = (Moles of Na2O) / 3

The limiting reagent is the one that produces the least amount of Cr2O3.

If the moles of Cr(NO3)3 / 2 < Moles of Na2O / 3, then Cr(NO3)3 is the limiting reagent.

If the moles of Cr(NO3)3 / 2 > Moles of Na2O / 3, then Na2O is the limiting reagent.

Now, we can calculate the moles of Cr2O3 produced using the limiting reagent.

Moles of Cr2O3 = (Moles of limiting reagent) * 1

Finally, we can convert the moles of Cr2O3 to grams using its molar mass.

Mass of Cr2O3 = Moles of Cr2O3 * Molar mass of Cr2O3

By comparing the amounts of Cr(NO3)3 and Na2O and calculating the moles and masses of Cr2O3, we can determine the limiting reagent and the maximum amount of Cr2O3 that can be produced.

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Answer:

The higher the temperature the faster the air molecules move. / The lower the temperature the slower the air molecules move.

Explanation:

Both answers work. Higher temp = more energy = moving faster, and the opposite applies. Lower temp = less energy = moving slower.

There are 7.405 × 10²² molecules in 0.123 moles of methane (option C).

The number of molecules in a substance can be used by multiplying the number of moles by Avogadro's number as follows:

no of molecules = no of moles × Avogadro's number

Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³.

According to this question, methane has 0.123 moles. The number of molecules is as follows;

no of molecules = 0.123 × 6.02 × 10²³

no of molecules = 7.405 × 10²² molecules

Therefore, 7.405 × 10²² molecules is the number of molecules in 0.123 moles of methane.

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Answer:

C. A down-filled coat via a p e x

Thermal insulation maintains the temperature inside the system and inhibits heat transfer. A down-filled coat would have the best thermal insulation properties. Thus, option C is correct.

Thermal insulation is the property of the substance to resist the heat and energy transfer from a substance of abundance to a lesser concentration. They lack the conducting particles.

It inhibits the heat to get transferred to other substances. The minimum heat transfer is achieved by the structural formation and the choice of the substance.

A down-filled coat is made of insulation material that keeps warm during the winters as its structure can trap and retain heat making the person warm during colds.

Therefore, option C. A down-filled coat best shows thermal insulation.

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Answer:

B. A possible explanation for why something happens.

Explanation:

By the process of elimination, it's none of the others but B.

The triathlete needs approximately 1580-1650 calories from fat each day. This calculation is based on a total daily calorie requirement of 4500 calories and a fat intake of 25% of total calories. Option D is Correct.

To calculate the calories needed from fat, we first need to determine the percentage of calories that should come from fat. The American Dietetic Association suggests that athletes' diets should consist of 20-35% fat.

Let's assume a moderate fat intake of 25% for our calculation.

Step 1: Calculate the total calories from fat:

Total Calories = 4500 calories/day

Percentage of Calories from Fat = 25%

Calories from Fat = Total Calories x Percentage of Calories from Fat

Calories from Fat = 4500 calories/day x 0.25

Calories from Fat = 1125 calories/day

Step 2: Convert calories to grams of fat:

Since 1 gram of fat contains 9 calories, we can calculate the grams of fat needed by dividing the calories from fat by 9:

Grams of Fat = Calories from Fat / 9

Grams of Fat = 1125 calories / 9

Grams of Fat ≈ 125 grams

The triathlete needs approximately 1580-1650 calories from fat each day. Remember that individual nutritional needs may vary, and it's always recommended to consult a healthcare professional or registered dietitian for personalized advice. Option D is Correct.

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Answer:

the answer is molecule

A compound is a substance that consists of two or more elements in a unique composition. The smallest particle of a compound is called a molecule. Chemical bonds hold together the atoms of molecules. Compounds can form only in chemical reactions, and they can break down only in other chemical reactions.

Explanation:

KOH - One oxygen atom

(NH4)2SO4 - Two nitrogen atoms

A chemical formula is a representation of the chemical composition of a substance using symbols and subscripts to indicate the number of atoms of each element in a molecule or formula unit.

In other words, it is a shorthand way of describing a chemical compound using the symbols of the elements present in the compound and the number of atoms of each element in the compound.

The chemical formula can show the way that the atoms in the compounds are arranged.

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Answer:

Explanation:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Answer:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Explanation:

Answer:

A. physical change

b. physical change

c. chemical change

d. chemical change

Answer: series circuit

Explanation:

when one bulb burns out the other bulb will go off because the circuit breaks

Answer:

the tree red

Explanation:

Copper (II) substances burn to produce bluish-green flames.

The copper (II) present in the wood will make the flame produce a bluish-green color.

This is because copper (II) compounds are known to produce flame colors that range from blue to bluish-green when tested in the laboratory.

This is because the electrons in the atoms of copper lose energy and drop to lower energy, releasing the lost energy as light in the process.

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Pascal's principle explains the hydraulic jack pressure propagation in enclosed static fluids, option D.

A strain change in one region of a liquid very still in a shut compartment is moved without misfortune to all region of the liquid as well as the holder walls, as per Pascal's guideline, some of the time known as Pascal's regulation. The French physicist Blaise Pascal at first expressed the thought.

Pressure is created when the force applied is multiplied by the surface area. Pascal's standard expresses that a strain ascend on one cylinder in a water powered framework causes an identical press one more cylinder in the framework. Assuming the second cylinder's region is multiple times higher than the first's, regardless of whether the strain is something very similar, the power following up on the subsequent cylinder will be multiple times more.

A good illustration of this effect is the hydraulic press, which is based on Pascal's idea and is used in systems like hydraulic brakes. Additionally, Pascal observed that a fluid's resting point has the same pressure in all directions; As a result, all planes passing through a given location would experience the same amount of pressure. Pascal's regulation or the Pascal's standard are different names for this reality.

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Salt in seawater is merely dissolved in the water, not chemically bonded to it. When water evaporates (one molecule at a time), only pure water returns to the atmosphere. Salt and other impurities are left behind.

Salt in seawater is merely dissolved in the water, not chemically bonded to it. When water evaporates (one molecule at a time), only pure water returns to the atmosphere. Salt and other impurities are left behind.

What happens when seawater is consumed by someone to quench thirst is that the: b) seawater draws water out of the body resulting in further dehydration and diarrhea.

A marine biome can be defined as a biological community which is typically characterized by the presence of salty ocean water.

Also, a marine biome makes up approximately 70% of the surface of planet Earth and it comprises three (3) types of water which include the following:

Based on scientific research (information) and records, we can reasonably infer that seawater would draw water out of a person's body when he or she consumes it to quench thirst, thereby, resulting in further dehydration and diarrhea

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Complete Question:

Describe what happens when seawater is consumed by someone to quench thirst.

a) Seawater helps diarrhea

b) Seawater draws water out of the body resulting in further dehydration and diarrhea

c) seawater must be ingested at twice the volume to quench thirst

d) Seawater quenches thirst when directly ingested

e) Seawater can quench thirst once it is boiled

it's 3 dollars per 12 eggs so 3/12

simplify 3/12 by dividing both numbers by 3 so you get 1/4

you should know what 1/4 of a dollar is

or think of it this way 12 eggs are 3 dollars so every 4 eggs is one dollar. divide 1 dollar by 4 eggs

Answer:

it gained

Explanation:

therefore it is an anion cause it is negatively charged ion

The ground-state electron configurations of chromium (Cr) and copper (Cu) are different from what we might expect based on their positions in the periodic table.

According to the Aufbau principle, electrons fill orbitals in increasing order of their energy levels. However, the ground-state electron configurations of chromium and copper deviate from this principle.

In the case of chromium, instead of the expected configuration of 4s² 3d⁴, the actual ground-state configuration is 4s¹ 3d⁵. This configuration allows for a half-filled d orbital (3d⁵), which is a more stable arrangement due to electron-electron repulsion being minimized.

Similarly, for copper, the expected configuration would be 4s² 3d⁹, but the actual ground-state configuration is 4s¹ 3d¹⁰. By having a completely filled d orbital (3d¹⁰), copper achieves greater stability through the exchange energy, where the energy is minimized by having paired electrons in the same orbital.

The deviation from the expected configurations in Cr and Cu demonstrates the importance of achieving stable configurations, even if it means redistributing electrons to achieve half-filled or electron completely filled d orbitals. This phenomenon is known as "irregular electron configuration" and is a result of the interplay between electron-electron repulsion and the exchange energy, which favors stable configurations.

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Answer:

The answers are 1:3:13

Explanation:

when I had to do these types of equations just search them up on you-tube lol theres this guy called Wayne Breslyn that does a really good job of explaining and has like the answers for any and everyy balancing equation

The breakdown of a 22-carbon fatty acid through aerobic metabolism via beta-oxidation and the citric acid cycle provides a substantial amount of energy in the form of ATP, allowing cells to perform various vital functions.

The approximate energy yield through aerobic metabolism of a 22-carbon fatty acid involves a series of major reactions within the mitochondria of cells. The process is known as beta-oxidation, and it generates acetyl-CoA molecules that enter the citric acid cycle (also known as the Krebs cycle) to produce ATP.

First, the 22-carbon fatty acid undergoes a series of four reactions in the beta-oxidation pathway. Each cycle of beta-oxidation removes a two-carbon acetyl-CoA molecule from the fatty acid chain, generating one molecule of NADH and one molecule of FADH2 in the process. These high-energy electron carriers will later enter the electron transport chain to produce ATP.

After the beta-oxidation process, the resulting acetyl-CoA molecules enter the citric acid cycle. In this cycle, each acetyl-CoA molecule is oxidized, leading to the production of three molecules of NADH, one molecule of FADH2, and one molecule of GTP (which can be converted to ATP). These electron carriers (NADH and FADH2) will transfer their electrons to the electron transport chain for ATP synthesis.

Finally, the electron transport chain, located in the inner mitochondrial membrane, utilizes the high-energy electrons from NADH and FADH2 to pump protons across the membrane. This establishes an electrochemical gradient that drives ATP synthesis through oxidative phosphorylation. The exact number of ATP molecules generated depends on several factors, but on average, the complete oxidation of a 22-carbon fatty acid yields approximately 129 molecules of ATP.

Overall, the breakdown of a 22-carbon fatty acid through aerobic metabolism via beta-oxidation and the citric acid cycle provides a substantial amount of energy in the form of ATP, allowing cells to perform various vital functions.

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Answer:

rank from lower to higher electronegativity

16)Li

   C

   N

17)Ne

  C

   O

18)Si

   P

   O

19)K

   Mg

   P

20)He

    S

    F