what is the definition of weight in science ​

The  properties can be used to determine whether a substance is a liquid or a plasma are: temperature, electron density, pressure, magnetic field, conductivity.

What is plasma?

Plasma is a state of matter consisting of charged particles, such as electrons, protons, and ions, that are held together by an electric field. It can be created in a laboratory or exist naturally in interstellar space, the Earth's atmosphere, and the Sun. Plasma is often referred to as the fourth state of matter, since it is different from the traditional three states of matter: solid, liquid and gas. Plasma has unique properties, such as being able to conduct electricity, which can be used to generate electricity in devices such as televisions and fluorescent lights.

If the temperature of a substance is high enough, it can exist as a plasma. Plasmas have much higher electron density than liquids. Plasmas are typically formed under high pressure, while liquids are formed under low pressure. Plasmas typically contain charged particles that can be affected by a magnetic field. Plasmas are typically better electrical conductors than liquids.

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The mass number is the atomic mass rounded to a whole number.

The mass number, can be regarded as the atomic mass number or nucleon number, which can be seen as the total number of protons  as well as neutrons in an atomic nucleus however if it is  approximated , it can be considered to be equal to the atomic mass of the atom expressed in atomic mass units.

It should be noted that the mass number is established by rounding the atomic weight to the nearest whole number.

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The ΔHvap of ethyl acetate in the given conditions is 35.08 kJ/mol.

Enthalpy of vaporization:

To find the ΔHvap (enthalpy of vaporization) of ethyl acetate in kJ/mol, you can use the Clausius-Clapeyron equation, which is:

ln(P1/P2) = (ΔHvap/R) * (1/T2 - 1/T1)

Given:
Normal boiling point (T2) = 77°C = 350.15 K (converting to Kelvin by adding 273.15)
Vapor pressure at 20°C (P1) = 73 Torr
Temperature at P1 (T1) = 20°C = 293.15 K (converting to Kelvin)
P2 = 760 Torr (normal atmospheric pressure at boiling point)
R = 8.314 J/(mol*K) (universal gas constant)

First, plug the values into the equation:

ln(73/760) = (ΔHvap/8.314) * (1/350.15 - 1/293.15)

Now, solve for ΔHvap:

ΔHvap = 8.314 * (ln(73/760) / (1/350.15 - 1/293.15))

ΔHvap ≈ 35079 J/mol (rounded to the nearest whole number)

Finally, convert ΔHvap to kJ/mol:

ΔHvap ≈ 35.08 kJ/mol (rounded to two decimal places)

So, the ΔHvap of ethyl acetate is approximately 35.08 kJ/mol.

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A group is a column on the periodic table is the main characteristic of the modern periodic table .

Features of Modern Periodic Table. There are eighteen vertical columns known as groups in the modern periodic table which are arranged from left to right and seven horizontal rows which are known as periods. The elements of this group form salts. They are noble gases and under normal conditions they are inert.

As you can see, each element in the periodic table is represented by a box containing the chemical symbol, the atomic number (the number of protons in the nucleus) and the atomic mass of the element.

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The balanced dissociation equation for the compound CS2CO3 in aqueous solution can be represented as follows:CS2CO3(s) → CO32-(aq) + CS22-(aq)

The compound CS2CO3 (carbon disulfide) does not dissolve in water to form an aqueous solution. Therefore, the balanced dissociation equation for the compound in an aqueous solution is shown above. In order to write a balanced dissociation equation for the given compound, it is important to understand whether the compound undergoes dissociation or not.

Carbon disulfide does not dissolve in water to form an aqueous solution. As a result, no dissociation occurs when the compound is dissolved in water. Hence, the balanced dissociation equation for the compound in an aqueous solution is: CS2CO3(s) → NR

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The bowl would contain approximately 2,990 grams of water.

To determine the number of grams of water in the bowl, we need to understand the specific heat capacity of water and the latent heat of fusion. The specific heat capacity of water is 4.18 J/g°C, which means it takes 4.18 joules of energy to raise the temperature of 1 gram of water by 1 degree Celsius. The latent heat of fusion for water is 334 J/g, which represents the amount of energy required to change 1 gram of water from a liquid to a solid state without changing its temperature.

Given that 12,500 joules of energy are released when the water freezes, we can calculate the amount of energy required to cool the water from 0°C to its freezing point using the specific heat capacity:

Energy = mass * specific heat capacity * temperature change

12,500 J = mass * 4.18 J/g°C * 0°C

Simplifying the equation, we find:

mass = 12,500 J / (4.18 J/g°C * 0°C) = 2,990.43 grams

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Answer:

When I'm writing about atoms, often what I'm writing about applies to (monatomic) ions too. It's slightly annoying to add "(or ions)" after every mention of atoms, where a word that refers to both atoms and ions would be ideal. Does such a word exist?

There is "element", but often this is used to refer to multiple atoms of the same element, whereas "atom" and "ion" clearly refer to a single atom or ion.

An example: "An isotope is an atom (or ion) of the same element but with a different number of neutrons."

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

Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.

Answer:

6

Explanation:

bromine has 1, hydrogen has 4 and nitrogen has 1 therefore equaling 6

The number of atoms in NH₄Br is six.

An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.

Atoms are the basic building blocks of matter. Anything that takes up space and anything with mass is made up of atoms.

In the given formula, there is one N atom, four H atoms and one Br atom making a total of six atoms.

Therefore, the number of atoms in NH₄Br is six.

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The balanced chemical equation for the reaction between oxygen and hydrogen to form water is:

2H2 + O2 → 2H2O

The molar mass of oxygen is 32 g/mol. Therefore, 64.0 g of oxygen is equivalent to 2 moles of oxygen. Since there is excess hydrogen, it is the limiting reactant and will determine the theoretical yield of water.

To calculate the theoretical yield of water, we need to use stoichiometry. From the balanced equation, we know that 2 moles of hydrogen react with 1 mole of oxygen to produce 2 moles of water. Therefore, 2 moles of hydrogen will produce 2 moles of water.

Using the molar mass of water (18 g/mol), we can convert the number of moles of water to grams:

2 moles H2O × 18 g/mol = 36 g H2O (theoretical yield)

To calculate the percent yield, we divide the actual yield by the theoretical yield and multiply by 100:

percent yield = (actual yield / theoretical yield) × 100

percent yield = (60 g / 36 g) × 100

percent yield = 166.7%

Since the percent yield is greater than 100%, this suggests that there may have been errors in the experimental procedure or measurements. Factors such as incomplete reactions, loss of product during transfer or filtration, or impurities in the reactants can all contribute to a lower actual yield and a lower percent yield.

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From the choices below, the major force controlling tertiary protein structure are hydrogen bonding, disulfide bonds and ion pairs hydrophobic effect.

Protein tertiary structure is the three dimensional shape of a protein. The tertiary structure will have a single polypeptide chain "backbone" with one or more protein secondary structures, the protein domains. Amino acid side chains may interact and bond in a number of ways.

Important to tertiary structure are hydrophobic interactions, in which amino acids with nonpolar, hydrophobic R groups cluster together on the inside of the protein, leaving hydrophilic amino acids on the outside to interact with surrounding water molecules.

Therefore, From the choices below, the major force controlling tertiary protein structure are hydrogen bonding, disulfide bonds and ion pairs hydrophobic effect.

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Answer:

An equation is written in a correct way if the equation is balanced. If you want to find out if the equation is balanced, you have to count how many molecules of each element is present and then just balance the equation on the left side and the right side.

Launching a projectile over a significant distance, such as several hundred miles, presents a range of complex challenges that must be carefully addressed. The success of achieving such a long range relies on accounting for various factors that influence the projectile's trajectory, including aerodynamics, atmospheric conditions, Earth's curvature, and external forces.

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Answer:

2 electron in 1 energy level

and 8 at second

also 8 at third

because only 4 shells are in the high school level

k,l,m,n

Molecular oxygen is composed of two oxygen atoms that share four electrons. molecular oxygen is composed of two oxygen atoms that share four electrons, which results in the formation of two covalent bonds between the atoms.

How many covalent bonds exist between the two oxygen atoms? Molecular oxygen has the chemical formula O2. The two oxygen atoms in the molecule share four electrons, forming two covalent bonds between them. Covalent bonds are formed when two atoms share electrons in order to attain a full outer shell of electrons. This is known as the octet rule.

The two oxygen atoms in molecular oxygen each have six electrons in their outermost shell. This is one less than the stable noble gas configuration, which has eight electrons in the outermost shell. By sharing two electrons with each other, they both achieve a stable configuration with eight electrons in their outermost shell. This sharing of electrons is what forms the covalent bonds between the two oxygen atoms. Each oxygen atom contributes two electrons to the bond, for a total of four electrons shared between them. In summary, molecular oxygen is composed of two oxygen atoms that share four electrons, which results in the formation of two covalent bonds between the atoms.

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Answer: No

Explanation: Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states.

Answer:

No. Two atoms of the same chemical element are typically not identical Explanation:

there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states

Answer:

that's a little bit difficult question

Explanation:

sorry !

To calculate the molar mass of the unknown protein, we can use the formula for osmotic pressure:

π = (n/V)RT

where:

π is the osmotic pressure,

n is the number of moles of solute,

V is the volume of the solution in liters,

R is the ideal gas constant (0.0821 L·atm/(mol·K)), and

T is the temperature in Kelvin.

First, let's convert the given values to the appropriate units:

Mass of protein = 28.85 mg = 0.02885 g

Volume of solution = 29.0 mL = 0.0290 L

Osmotic pressure = 3.28 torr

Now, we rearrange the osmotic pressure formula to solve for n:

n = (πV) / (RT)

Substituting the values:

n = (3.28 torr * 0.0290 L) / (0.0821 L·atm/(mol·K) * 289 K)

n ≈ 0.0386 mol

Next, we can calculate the molar mass (M) of the protein using the formula:

M = mass / moles

M = 0.02885 g / 0.0386 mol

M ≈ 0.746 g/mol

Therefore, the molar mass of the unknown protein is approximately 0.746 g/mol.

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5.25 moles

Chemistry

Atomic Structure

Aqueous Solutions

Stoichiometry

Step 1: Define

[RxN - Balanced] 2KClO₃ (s) → 2KCl (s) + 3O₂ (g)

[Given] 3.50 mol KClO₃

[Solve] mol O₂

Step 2: Identify Conversions

[RxN] 2 mol KClO₃ (s) → 3 mol O₂ (g)

Step 3: Stoichiometry

Answer: A

Explanation:

just add

Non-heme iron is found in some foods that provide all the amino acids humans require for the absorption of iron.

Amino acids are defined as the substances which are considered to be the monomers of proteins.Every amino acid has the same structure  which consists  of a central carbon  bonded to an amino group , carboxyl group and a hydrogen.

Each amino acid also has  an another atom or a group of atoms bonded to the alpha carbon which are also known as the R group or the variable group of the side chain.There are 20 common amino acids which are  present in natural proteins and each amino acid has the same backbone.

The sequence and number of amino acids determines protein's shape,size and also its function. Each amino acid is attached to the other by a covalent bond formed by a dehydration reaction.

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The amount of aluminum that can be formed by the passage of 305 C (coulombs) through an electrolytic cell containing a molten aluminum salt is 0.0286 g

Faraday's law of electrolysis states that the amount of substance produced during electrolysis is directly proportional to the amount of electricity passed through the cell. The relationship can be expressed by the equation:

moles of substance = (current in amperes x time in seconds) / (Faraday's constant x charge on one mole of the substance)

where Faraday's constant is 96,485.3 C/mol and the charge on one mole of aluminum is 3 x 96500 C (since aluminum has a 3+ charge in the electrolyte). To find the mass of aluminum produced, we need to first calculate the number of moles of aluminum produced, and then multiply by its molar mass (27 g/mol).

So, the number of moles of aluminum produced is:

moles of aluminum = (305 C / (3 x 96500 C/mol)) x (1 A / 1 C) x (1 s / 1 s)

moles of aluminum = 0.001059 mol

Finally, the mass of aluminum produced can be calculated by multiplying the number of moles by the molar mass:

mass of aluminum = 0.001059 mol x 27 g/mol

mass of aluminum = 0.0286 g

Therefore, approximately 0.0286 grams of aluminum can be formed by the passage of 305 C through an electrolytic cell containing a molten aluminum salt.

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Answer:

The element that is the reaction is Pt

Explanation:

Answer:

The answer is pt on edge

Explanation:

Answer:

literally same im failing almost every class and i just know my dad hates me because of it

Explanation:

The two coordination isomers can be represented using the following formulas:

\([CO(C_{2}O_{4})_{3}]\)\([Cr(c_{2}H_{8}N_{2})_{3}]\)

Cobalt(III) oxalate, Chromium(III) ethylenediamine

\([Co(C_{2}H_{8}N_{2})_{3} ][Cr(C_{2}O_{4})_{3}]\)

Cobalt(III) ethylenediamine, Chromium(III) oxalate

The coordination isomers are a type of isomerism in which the ligands in a coordination compound are arranged differently around the central metal ion. In the given complex \([Co(C_{2}H_{8}N_{2})_{3}]\)\([Cr(C_{2}O_{4})_{3}]\) there are two types of ligands: the neutral bidentate ligand ethylenediamine\(C_{2}H_{8}N_{2}\), which is coordinated to the cobalt ion, and the anionic tridentate ligand oxalate \((C_{2}O_{4)}\), which is coordinated to the chromium ion.

To obtain the coordination isomers of the given complex, we need to interchange the positions of these two types of ligands between the two metal ions while keeping the overall charge and coordination number of the complex the same. There are two possible coordination isomers that can be formed:

\([Co(C_{2}O_{4})_{3})]\)\([Cr(C_{2}H_{8}N_{2})_{3})]\) : In this isomer, the cobalt ion is coordinated by three oxalate ligands, while the chromium ion is coordinated by three ethylenediamine ligands.

\([Co(C_{2}H_{8}N_{2})_{3}]\)\([Cr(C_{2}O_{4})_{3}]\): In this isomer, the cobalt ion is coordinated by three ethylenediamine ligands, while the chromium ion is coordinated by three oxalate ligands.

The two coordination isomers can be represented using the following formulas:

\([CO(C_{2}O_{4})_{3}]\)\([Cr(c_{2}H_{8}N_{2})_{3}]\)

Cobalt(III) oxalate, Chromium(III) ethylenediamine

\([Co(C_{2}H_{8}N_{2})_{3} ][Cr(C_{2}O_{4})_{3}]\)

Cobalt(III) ethylenediamine, Chromium(III) oxalate

The coordination isomerism has important implications in the field of coordination chemistry, as it can significantly affect the physical and chemical properties of a complex. For example, the coordination isomers of a complex may have different colors, magnetic properties, and reactivities, which can be exploited in various applications such as catalysis, electrochemistry, and materials science.

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The 'reabsorption' of HCO3 (bicarbonate) in the proximal tubule is dependent on the secretion of H+ (hydrogen ions).

Here's a step-by-step explanation:
1. In the proximal tubule, the reabsorption process starts with the secretion of H+ ions into the tubular lumen.
2. The secreted H+ ions combine with HCO3- ions present in the tubular fluid to form H2CO3 (carbonic acid).
3. H2CO3 then dissociates into H2O (water) and CO2 (carbon dioxide) in the presence of the enzyme carbonic anhydrase.
4. H2O and CO2 are reabsorbed back into the proximal tubule cells, where they combine to form H2CO3 again.
5. H2CO3 dissociates into H+ and HCO3- ions, and HCO3- is reabsorbed into the bloodstream.

So, the reabsorption of HCO3- in the proximal tubule is dependent on the secretion of H+ ions.

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