Is mercury, hg, an element, a compound, a homogeneous mixture, or a heterogeneous mixture?

The mass of KClO₃ that was decomposed in the given reaction by the ideal gas equation is approximately 7.19 grams.

Given:

Pressure (P) = 0.964 atm

Volume (V) = 0.65 L

Temperature (T) = 22 °C = 22 + 273.15 = 295.15 K

The ideal gas law: PV = nRT

Where:

P = Pressure in atm

V = Volume in liters

n = Number of moles

R = Ideal gas constant = 0.0821 L·atm/(mol·K)

T = Temperature in Kelvin

n = (PV) / (RT)

n = (0.964 atm) × (0.65 L) / (0.0821 L·atm/(mol·K) × 295.15 K)

n ≈ 0.0294 mol

2 moles of KClO₃ produce 1 mole of O₂. Therefore, the number of moles of KClO₃decomposed would be:

Moles of KClO₃= 2 × 0.0294 mol

Moles of KClO₃≈ 0.0588 mol

Molar mass of KClO₃= 122.55 g/mol

Mass of KClO₃= Moles of KClO₃× Molar mass of KClO₃

Mass of KClO₃≈ 0.0588 mol × 122.55 g/mol

Mass of KClO₃≈ 7.19 grams

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Answer:

The total weight of an atom is called the atomic weight. It is approximately equal to the number of protons and neutrons, with a little extra added by the electrons. The stability of the nucleus and hence the atom' s radioactivity, is heavily dependent upon the number of electrons it contains.

The number of protons and neutrons in an atom is responsible for the weight of an atom. The majority weight of the atom is experienced on the nucleus of an atom.

The atoms are known as the basic building blocks of matter. It is the atom which possess the properties of the chemical element. The particles which are smaller in size than the atom are sub atomic particles. Atoms are not possible to exist independently. They form ions, molecules, etc.

The positively charged subatomic particles are called protons and the negatively charged subatomic particles are electrons. The neutrons are chargeless particles. The sum of protons and neutrons of an atom gives the mass number.

The central portion of the atom is the nucleus. It consists of positive protons and electrically neutral neutrons.

The majority of atomic weight is found in the nucleus, the number of protons and neutrons is responsible for the weight of an atom.

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Answer:

The reaction is endothermic

Explanation:

we know that the reactants had to get energy from its surroundings which means that the reaction is endothermic

To have precisely 0.5 moles of nitrate ions, 329 mL of the Ca(NO3)2 solution at 0.76 M are required.

To determine the volume of a 0.76 M solution of Ca(NO3)2 needed to have exactly 0.5 moles of nitrate ions, we can use the concept of molarity and the stoichiometry of the compound.

Ca(NO3)2 contains two nitrate ions (NO3-) per formula unit. Therefore, we can calculate the moles of Ca(NO3)2 required to obtain 0.5 moles of nitrate ions:

Moles of Ca(NO3)2 = 0.5 moles / 2 = 0.25 moles

Next, we can use the formula for molarity to find the volume of the solution:

Molarity = Moles / Volume

Rearranging the formula:

Volume = Moles / Molarity

Plugging in the values:

Volume = 0.25 moles / 0.76 M ≈ 0.329 liters

Since the volume is given in liters, we can convert it to milliliters by multiplying by 1000:

Volume = 0.329 liters × 1000 mL/liter ≈ 329 mL

Therefore, approximately 329 mL of the 0.76 M solution of Ca(NO3)2 are needed to have exactly 0.5 moles of nitrate ions.

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Property of water:

Due to the water's ability to stick together (Cohesion), droplets form instead of being spread evenly.  

The strong cohesion between water molecules:  

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While the atomic mass of oxygen is approximately 16 daltons, its mass in grams would be a different value due to the conversion between daltons and grams using Avogadro's constant.

The atomic mass of an oxygen atom is approximately 16 daltons. Dalton, also known as atomic mass unit (amu), is a unit used to express the atomic and molecular weights of elements and compounds. The atomic mass of an element is determined by the total number of protons and neutrons in the nucleus of its atoms.

In the case of oxygen, it has an atomic number of 8, which indicates that it has 8 protons in its nucleus. The most common isotope of oxygen has a mass number of 16, meaning it has 8 protons and 8 neutrons. Since the mass of a proton and neutron is approximately 1 dalton, the total atomic mass of an oxygen atom with 8 protons and 8 neutrons is approximately 16 daltons.

It is important to note that the atomic mass is not directly equivalent to grams. The atomic mass is a relative scale based on the carbon-12 isotope, where carbon-12 is assigned a mass of exactly 12 daltons.

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Explanation:

Answer:

I think it would be Bonding

Explanation:

Valence electrons indicate an element's bonding behavior, stability, and reactivity.

d it is made of cells

Explanation:

because it is the one that makes most sense

The standard reaction enthalpy for the given reaction is +235.8 kJ/mol.

The standard reaction enthalpy (ΔH°) for the given reaction is determined as follows:

Equation of reaction: 3 Fe₂O₃ (s) → 2 Fe₃O₄ (s) + ½ O₂ (g)

The standard enthalpy of formation values for Fe₂O₃ (s), Fe₃O₄(s), and O₂(g) is used to calculate the standard reaction enthalpy.

ΔH° = [2 × ΔH°f(Fe₂O₃)] + [½ × ΔH°f(O₂)] - [3 × ΔH°f(Fe₃O₄)]

where;

ΔH°f(Fe₂O₃) = -824.2 kJ/mol

ΔH°f(Fe₃O₄) = -1118.4 kJ/mol

ΔH°f(O₂) = 0 kJ/mol

ΔH° = [2 × (-1118.4 kJ/mol)] + [½ × 0 kJ/mol] - [3 × (-824.2 kJ/mol)]

ΔH° = -2236.8 kJ/mol + 0 kJ/mol + 2472.6 kJ/mol

ΔH° = 235.8 kJ/mol

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Answer:

democritus is the first person

The volume (in liters) of the carbon dioxide gas produced if the reaction is carried out at STP is 65.5 L

We'll begin by examining the eqaution for the reaction to get useful information about the reaction. Details below:

CH₄ +2O₂ -> CO₂ + 2H₂

From the balanced equation above,

1 L of methane, CH₄ reacted to produce 1 L of carbon dioxide, CO₂

With the above information, we can obtain the volume of carbon dioxide, CO₂ produced when 65.5 L of methane, CH₄ reacts at STP. Details below:

1 L of methane, CH₄ reacted to produce 1 L of carbon dioxide, CO₂

Therefore

65.5 L of methane, CH₄ will also react to produce 65.5 L of carbon dioxide, CO₂

Thus, the volume of carbon dioxide, CO₂ produced is 65.5 L

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Answer:

Ag one dot

Explanation:

i hope it helps you

If an unknown solution is a poor conductor of electricity, then it must be slightly ionized or not ionized at all. This is because in order for a solution to conduct electricity.

it must contain charged particles (ions) that can move freely to carry the electric current. If the solution is highly ionized, it would be a good conductor of electricity. Similarly, if the solution is highly reactive, it doesn't necessarily mean that it will be a good or poor conductor of electricity. Therefore, the answer to this question would be The solution is slightly ionized. Na cation and Cl anion combine through electrovalent bonding to form sodium chloride, generally referred to as common salt. In its lattice, it takes the shape of a cubic crystal. NaCl is hard and has a high melting point because electrovalent bonds are strong and would require a lot of energy to break. In contrast, crystalline NaCl is a bad conductor of electricity. However, the conducting ions get loose and it becomes an excellent conductor of electricity when it comes into touch with moisture or when it is molten.

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The electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.

Atomic number of Chlorine  is 17. to write the electronic configuration of chlorine we need to know the number of electrons in chlorine atom. the atomic number of chlorine is 17 therefore there are 17 electrons. the first two electron enter in 1s since s can hold only 2 electrons then next two electron will enter in 2s . the next six electrons will enter in 2p since p can hold six electrons . and next two electron in 3s now reaming 5 will enter in 3p. therefore the  electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.

Thus, the  electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵

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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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Step 1 - First, we need to transform kg into g. We need to multiply it by 1000:

158 kg = 158,000 g of phosphorus

Step 2 - Now we need to know the molar mass of phosphorus. Look for it at the periodic table. It is 30.97 g/mol.

Step 3 - We transform grams into moles:

30.97 g ---- 1 mol

158,000 g ---- x mol

x = 5,101.7 moles of phosphorus

Step 4 - We transform moles into atoms using Avogrado's constant:

6.022 x 10^23 ---- 1 mol

x ---- 5,101.7 moles of phosphorus

x = 3.072 x 10^27 atoms

If you want to calculate it in another way:

158000/30.97 x 6.022 x 10^23 = 3.072 x 10^27 atoms

Answer: There are 3.072 x 10^27 atoms of phosphorus

At 750 K and 2.50 atm, a sample of carbon dioxide takes up 4.50 liters. the volume of the gas at STP is approximately 4.16 L. So, the closest is (A) 4.1 L.

To determine the volume of the gas at STP (Standard Temperature and Pressure), we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure

V = Volume

n = Number of moles

R = Ideal gas constant

T = Temperature

First, we need to calculate the number of moles of carbon dioxide using the given conditions. The equation for the ideal gas law can be rearranged to solve for the number of moles:

\(n = \frac{{PV}}{{RT}}\)

Substituting the values:

P = 2.50 atm

V = 4.50 L

T = 750 K

R = 0.0821 L·atm/(mol·K) (ideal gas constant)

\(n = \frac{{2.50 \, \text{atm} \times 4.50 \, \text{L}}}{{0.0821 \, \text{L} \cdot \text{atm/(mol} \cdot \text{K)} \times 750 \, \text{K}}}\)

Calculating n:

n ≈ 0.192 mol

Now, we can use the number of moles to find the volume of the gas at STP. At STP, the temperature is 273.15 K, and the pressure is 1 atm.

Using the equation PV = nRT:

\(V_{\text{STP}} = \frac{{n \cdot R \cdot T_{\text{STP}}}}{{P_{\text{STP}}}}\)

Substituting the values:

n = 0.192 mol

R = 0.0821 L·atm/(mol·K)

T(STP) = 273.15 K

P(STP) = 1 atm

\(V_{\text{STP}} = \frac{{(0.192 \, \text{mol}) \cdot (0.0821 \, \text{L} \cdot \text{atm}/(\text{mol} \cdot \text{K})) \cdot (273.15 \, \text{K})}}{{1 \, \text{atm}}}\)

Calculating V(STP):

V(STP) ≈ 4.16 L

Therefore, the volume of the gas at STP is approximately 4.16 L. The closest answer choice is A. 4.1 L.

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The answer would be B: increases

Hope this helps! :)✨

As the water is heated, pressure increases and hence the volume of the balloon increases.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.Pressure is inversely proportional to volume as per Boyle's law.

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Answer:

A push or pull is referred to as a force. Forces can cause objects to move, slow, stop, or change the direction in which they travel. The force of gravity, for example, pulls all objects toward the Earth's center. Every time two things interact, a force is exerted on each of them. When this happens, the two items no longer feel the force after the interaction ends.

Explanation:

Force is that external physical cause which changes or tends to change:

hope this helps you.

The monomer from which the very common commercial polymer poly vinyl chloride is vinyl chloride with the formula, CH₂Cl = CH₂Cl. The PVC is formed by addition polymerization.

Polymerization is the process of combination of smaller molecules or compounds in large number to form macromolecules or polymers. There are a lot of polymers that we are using daily in the form of bags, plastics, bottles etc.

Among the common polymers we use PVC or poly vinyl chloride is very essential commercial polymer. The monomer of PVC is vinyl chlorides.

The polymerization of n vinyl chloride to form polyvinyl chloride is given below.

\(\rm n CH_{2}Cl = CH_{2}Cl \rightarrow (-CH_{2}Cl - CH_{2}Cl -)__{n}\)

The polymerization of vinyl chloride is taking place through addition mechanism. The vinyl chloride monomer repeatedly add one by one to form the polymer.

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Answer:

it's rn and the atomic number is 86 if u needed that

Explanation:

:)

Answer:

Na

Explanation:

On the periodic table, the atomic radius of an atom typically decreases when going from left to right and increases when going from top to bottom.

Answer:

1)30

2)

3)32.3

4)20.8

5)52.5

6)42.6

7)

8)11

9)3.5

10)12.75

Explanation:

please give me brainlest and follow me

the blank spaces are which I don't understand that diagram

A ceiling level is a level that is not to be exceeded at any time.

A ceiling level refers to the maximum concentration of a substance that should never be surpassed in the given environment, such as a workplace or laboratory, to ensure safety and prevent any harmful effects.This indicates that regardless of the length of time, a worker exposed to a concentration greater than the CEV may experience health impacts. This exposure cap is closely adhered to for chemicals and biological agents that might have long-term negative impacts on health.

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The pressure in the burette if the atmospheric pressure in the room at that time was 765.0 torr is 915 torr

The pressure in the burette can be obtained by using the following formula:

Pressure of gas = Atmospheric presure + pressure due to height

With the above formula, we can determine the pressure in the burette. This is illustrated below:

Pressure in burette = Atmospheric presure + pressure due to height

Pressure in burette = 765.0 + 150

Pressure in burette = 915 torr

Thus, the pressure in burette is 915 torr

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Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.

The partial pressure of nitrogen in the low-pressure weather system in Denver is 511.9 mmHg, calculated using the fraction of nitrogen in dry air and the given atmospheric pressure of 655 mmHg.

To calculate the partial pressure of nitrogen in the low-pressure weather system in Denver, we first need to find the total pressure of the system. The given atmospheric pressure is 655 mmHg.
Now, we need to find the partial pressure of nitrogen in the dry air. Given that 78.0% of dry air is nitrogen, we can calculate the partial pressure of nitrogen using the following formula:

The partial pressure of nitrogen = Total pressure x Fraction of nitrogen
The fraction of nitrogen in dry air is 0.78 (78.0% expressed as a decimal).
Partial pressure of nitrogen = 655 mmHg x 0.78
Partial pressure of nitrogen = 511.9 mmHg

Therefore, the partial pressure of nitrogen in the low-pressure weather system in Denver is 511.9 mmHg.

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The formal charges are as follows: SiO2: Si: 0, O (x2): -1, SO2: S: 0, O (x2): 0, O: -1 NO3: N: 0, O (x2): -1, O: +1

SiO2:

Si: 0

O (x2): -1

The structure of SiO2 is a network of SiO4 tetrahedra linked together by sharing oxygen atoms. Each Si atom has four bonds to oxygen atoms, while each O atom has two bonds to silicon atoms.

The formal charge for an atom is calculated by subtracting the number of lone pair electrons and half of the bonded electrons from the total number of valence electrons. For Si, the formal charge is 4 - 0.5(8) = 0, since it is bonded to two O atoms.

Each O atom has 6 valence electrons, and in SiO2, each O atom has two lone pairs and two bonded electrons. Thus, the formal charge for each O atom is 6 - 2 - 0.5(4) = -1.

SO2:

S: 0

O (x2): 0

O: -1

The structure of SO2 is a bent molecule, with the S atom at the center bonded to two O atoms. The formal charge for an atom is calculated by subtracting the number of lone pair electrons and half of the bonded electrons from the total number of valence electrons.

For S, the formal charge is 6 - 0.5(4) - 2 = 0, since it is bonded to two O atoms and has two lone pairs. Each O atom has 6 valence electrons and in SO2, each O atom has two lone pairs and one bonded electron. Thus, the formal charge for each O atom is 6 - 2 - 0.5(2) = -1.

NO3:

N: 0

O (x2): -1

O: +1

The structure of NO3 is a trigonal planar molecule, with the N atom at the center bonded to three O atoms. The formal charge for an atom is calculated by subtracting the number of lone pair electrons and half of the bonded electrons from the total number of valence electrons.

For N, the formal charge is 5 - 0.5(6) - 3 = 0, since it is bonded to three O atoms and has one lone pair. Each O atom has 6 valence electrons and in NO3, one O atom has one lone pair and two bonded electrons, while the other two O atoms each have three bonded electrons.

Thus, the formal charge for the O atom with the lone pair is 6 - 2 - 0.5(4) = -1, and the formal charge for the other two O atoms is 6 - 1 - 0.5(6) = +1.

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Answer:

if the object sank then that object has a greater density then water. if the object floated then its density is lower then water.

Explanation:

lets say object 1 has a density of 24/cm3. the density is greater then water (1.0000g/cm3) so it would sink. now lets say object 2 has a density of 0.79383g/cm3 since it's less then the density of water (1.0000g/cm3) it would float.