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The density of argon gas at STP is 1.78 g/L.

The density formula is given as :

D = m / v

where,

D = density

m = molar mass

v = volume in Liter

the ideal gas equation is given as :

P V = n R T

the STP that standard temperature of the gas is 273.15 K and the standard pressure of gas is 1 atm.

D = P M / R T

D = (1 atm× 39.04 g /mol) / (0.082 atm L / mol K× 273.15 K)

D = 1.78 g / L

Thus, the density of argon is 1.78 g / L at STP.

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Sister chromatids is the term for the chromosomes that are identical after DNA replication.

Sister chromatids are identical chromosomes that are created during the process of DNA replication. DNA replication is the process where a DNA strand is copied, creating a new strand. During this process, each chromosome is split in half, forming two identical halves.

These halves are known as sister chromatids and are held together by a centromere. Sister chromatids are attached to one another during the interphase stage of the cell cycle and are separated during the metaphase stage of the cell cycle.

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If a team completes the circuit, they will contribute $15 + ($2 x 2.64) = $21.28 to the Boise Flying Club.

If a team completes the circuit, they will contribute $15 (registration fee) + ($2 x distance) to the Boise Flying Club. To determine the distance of the most direct route, we can use the Pythagorean Theorem:
a² + b² = c²
where a and b are the horizontal and vertical distances, respectively, and c is the total distance (the hypotenuse).

From Julia Davis Park to the Egyptian Theater, the distance is 0.9 miles. From the theater to Boise High School, the distance is 0.8 miles. From the school back to the park, the distance is 1.2 miles.

To find the total distance, we need to find the hypotenuse of two right triangles: one with legs of 0.9 miles and 0.8 miles, and one with legs of 0.8 miles and 1.2 miles.

For the first triangle:
a² + b² = c²
(0.9)² + (0.8)² = c²
0.81 + 0.64 = c²
1.45 = c²
c ≈ 1.20 miles

For the second triangle:
a² + b² = c²
(0.8)² + (1.2)² = c²
0.64 + 1.44 = c²
2.08 = c²
c ≈ 1.44 miles

The total distance is the sum of the two hypotenuses:  1.20 + 1.44 = 2.64 miles

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Answer: NaCl: Sodium chloride

MgO: Magnesium oxide

CO: Carbon monoxide (Note: this is a covalent compound, not an ionic compound)

CO₂: Carbon dioxide (Note: this is a covalent compound, not an ionic compound)

NaF: Sodium fluoride

The pH of a 4.205 m Ca(CH3COO)2 solution at 25°C is 2.87.

To find the pH of a 4.205 m Ca(CH3COO)2 solution at 25°C, we need to use the dissociation of acetic acid (CH3COOH) to calculate the concentration of H+ ions in the solution.

First, we need to find the concentration of CH3COO- ions in the solution. Since Ca(CH3COO)2 dissociates into two CH3COO- ions and one Ca2+ ion, the concentration of CH3COO- ions is twice the molarity of the solution:

[CH3COO-] = 2 x 4.205 = 8.41 M

Next, we can use the Ka value for CH3COOH to find the concentration of H+ ions:

Ka = [H+][CH3COO-]/[CH3COOH]

Since we know [CH3COO-] and Ka, we can rearrange the equation to solve for [H+]:

[H+] = sqrt(Ka x [CH3COOH]/[CH3COO-])

[H+] = sqrt(1.8 x 10^-5 x 8.41/8.41) = 1.34 x 10^-3 M

Finally, we can use the pH formula to find the pH of the solution:

pH = -log[H+] = -log(1.34 x 10^-3) = 2.87

Therefore, the pH of a 4.205 m Ca(CH3COO)2 solution at 25°C is 2.87.

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Answer:

A is the correct answer.

The correct answer is C. III, (CH3)3C-Br.

When alkyl halides are heated in aqueous solutions, they can undergo an elimination reaction in which the halogen atom is eliminated along with a proton from the adjacent carbon atom. The rate of this reaction depends on several factors, including the strength of the C-H bond and the strength of the C-X bond (where X is the halogen atom).

In general, the rate of elimination reactions increases as the size of the halogen atom decreases. This is because smaller halogens such as fluorine and chlorine have stronger C-X bonds than larger halogens such as bromine and iodine. Therefore, the alkyl halide with the weakest C-Br bond, (CH3)3C-Br, would be expected to react most slowly when heated in aqueous solution compared to (CH3)3C-F and (CH3)3C-Cl.

Additionally, the (CH3)3C-F and (CH3)3C-Cl alkyl halides have strong C-H bonds due to the electronegativity of fluorine and chlorine, respectively, which makes them less likely to undergo elimination reactions compared to (CH3)3C-Br.

Therefore, the correct answer is C. III, (CH3)3C-Br, which would react most slowly when heated in aqueous solution.

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The brain sends messages traveling the spinal cord to peripheral nerves through the body that serve to control the muscles and central organs. The relation to the body and large as differently recognized from the mind nervous system is made of specialized cells transmitting nerve impulses; a nerve cell. The Central nervous system with the parts of the body that interact within the outside world.

The molarity of calcium hydroxide if 15 ml of the solution is neutralized by 15.8 ml of. 90M phosphoric acid​ is 0.22 M.

The balanced chemical equation for the reaction between calcium hydroxide and phosphoric acid is:

Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + 2H₂O

The molar ratio of calcium hydroxide to phosphoric acid is 1:3.

The volume of the phosphoric acid solution is 15.8 mL and the molarity of the phosphoric acid solution is 0.90 M.

Use the following equation to calculate the moles of phosphoric acid:

moles of H₃PO₄ = molarity × volume

moles of H₃PO₄ = 0.90 M × 15.8 mL

moles of H₃PO₄ = 14.22 mmol

Since the molar ratio of calcium hydroxide to phosphoric acid is 1:3, the moles of calcium hydroxide is 1/3 of the moles of phosphoric acid.

moles of Ca(OH)₂ = moles of H₃PO₄ / 3

moles of Ca(OH)₂ = 14.22 mmol / 3

moles of Ca(OH)₂ = 4.74 mmol

Use the following equation to calculate the molarity of calcium hydroxide:

molarity of Ca(OH)₂ = moles of Ca(OH)₂ / volume

molarity of Ca(OH)₂ = 4.74 mmol / 15 mL

molarity of Ca(OH)₂ = 0.28 M

Therefore, the molarity of calcium hydroxide is 0.22 M.

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Answer:

weathering and erosion

Explanation:

Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar. Often starting thousands of miles from the ocean, rocks slowly travel down rivers and streams, constantly breaking down along the way.

Answer:

weathering and erosion

Answer:

molar mass of zn( no3) 2

is 189.36 g/ mol

The standard free energy change for the reaction of 1.78 moles of CO(g) at 308 K, 1 atm would be -36.9 kJ. This reaction is product-favored under standard conditions at 308 K.

To calculate the standard free energy change (ΔG°) for the reaction, we can use the equation:

ΔG° = ΔH° - TΔS°

Given that ΔH°rxn = -206.1 kJ and ΔS°rxn = -214.7 J/K, we need to convert the values to kJ and adjust the sign for ΔS°:

ΔH°rxn = -206.1 kJ

ΔS°rxn = -214.7 J/K = -0.2147 kJ/K

Now we can substitute these values into the equation:

ΔG° = -206.1 kJ - (308 K)(-0.2147 kJ/K)

    = -206.1 kJ + 66.1736 kJ

    = -139.9264 kJ

Since the question asks for the standard free energy change for 1.78 moles of CO(g), we need to calculate the moles of CO(g) in the reaction:

1 mole of CO(g) reacts to form 1 mole of CH₄(g)

1.78 moles of CO(g) will react to form 1.78 moles of CH₄(g)

Therefore, the standard free energy change for the reaction of 1.78 moles of CO(g) at 308 K, 1 atm is -139.9264 kJ.

Based on the negative value of ΔG°, the reaction is product-favored under standard conditions at 308 K.

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Answer:

375 grams

Explanation:

The percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%

Percent yield is defined as the amount of product actually made compared with the maximum calculated yield. It is the ratio of actual yield to the theoretical yield.

Mass of calcium carbonate = 155 g

Mass of HCl = 250g

Mass of calcium chloride product = 142 g

Moles of calcium carbonate = 155 / 100 = 1.55 moles

Moles of HCl = 250 / 36.5 = 6.85 moles

Mass of calcium chloride = Moles x Molar mass

                                          = 1.55 mole x 111 g/ mole

                                          = 172 g /mole

Theoretical yield = 172 g

Actual yield = 142 g

Percent yield = Actual yield / Theoretical yield x 100
                      = 142 / 172 x 100

                      = 82.55 %

Thus, the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%

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The variable that is unknown until the experiment is performed is the dependent variable.

In a scientific experiment, variables are classified into two main categories: independent variables and dependent variables. The independent variable is the variable that is intentionally manipulated or changed by the experimenter. It is under the control of the experimenter and is deliberately altered to observe its effect on the dependent variable.

On the other hand, the dependent variable is the variable that is measured or observed as the outcome or response in the experiment. It is the variable that is expected to change in response to the manipulation of the independent variable. The value or behavior of the dependent variable depends on the value or behavior of the independent variable.

Typically, before conducting an experiment, researchers have a hypothesis or an expectation about how the independent variable will affect the dependent variable. However, the actual outcome or result of the experiment, which is observed through the measurement of the dependent variable, remains unknown until the experiment is performed.

The purpose of conducting the experiment is to gather empirical data and observe the changes in the dependent variable to analyze the relationship between the independent and dependent variables.

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Answer:

because Stefan's nose is so warmer than the ground.

ground have a same temperature like air but nose of human have maybe 32°C.

When solid converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Snow that falls on Stefan’s nose melts very quickly because Stefan's nose is so warmer than the ground.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing.

Snow that falls on the ground melts slowly. Snow that falls on Stefan’s nose melts very quickly because Stefan's nose is so warmer than the ground. Ground have a same temperature like air but nose of human may have 32°C.

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B. The rate would drop or decrease. Although the rate of a chemical reaction typically rises as the concentration of the reactants increases, if the concentration falls, the reaction rate also rises.

In general, the rate of a chemical reaction rises as the reactant concentration does. The volume of reactant that transforms into product over a specific amount of time. additionally described as the quantity of a product that forms in a specific length of time — Since a chemical system is at equilibrium when the rate of the forward reaction equals the rate of the reverse reaction, reaction rates and chemical equilibrium are connected.

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Complete Question:

a reaction carried out and the rate measured. the experiment is repeated, but with doubling the concentration of a reactant. the measured rate does not change. what must be true about the reactants role in the reaction?

A. the rate would increase.

B. the rate would decrease.

C. the rate would remain constant.

According to the Safety Data Sheet (SDS), GHS classification in the United States, Tempo (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl) has been assigned Skin corrosion (Category 1B), and Skin corrosion (Category 1B).

According to the GHS classification in the United States, Tempo (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl) has been assigned the following hazard classifications:

Skin corrosion (Category 1B): This classification indicates that Tempo has the potential to cause severe damage to the skin, such as chemical burns or irreversible skin lesions. It implies that contact with the substance can lead to immediate and significant harm to the skin.

Serious eye damage (Category 1): This classification signifies that Tempo has the potential to cause severe and irreversible damage to the eyes. Exposure to the substance, either by direct contact or through aerosols or splashes, can result in immediate and lasting harm, including vision impairment or blindness.

These hazard classifications highlight the importance of taking proper precautions when handling Tempo. It is crucial to ensure adequate protection measures, such as wearing appropriate personal protective equipment (PPE) like gloves, goggles, and a face shield, to minimize the risk of skin and eye exposure.

Additionally, safe handling practices, including careful storage, containment, and proper ventilation, should be implemented to reduce the likelihood of accidents or unintended exposures.

It is important to note that the GHS classification provides a standardized system for identifying and communicating the hazards of chemical substances.

However, to obtain specific and detailed information about the safety hazards and recommended control measures for Tempo, it is necessary to consult the Safety Data Sheet (SDS) provided by the manufacturer or supplier.

The SDS will offer comprehensive guidance on the safe handling, storage, and emergency response procedures for Tempo, ensuring the appropriate protection of individuals and the environment.

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Answer:

1) A substance with a weaker molecular attraction would melt first.

2) A substance with stronger molecular attraction would condense first.

The first substance to melt is one with a lesser molecular attraction. The first substance to condense would be one with greater molecular attraction.

Molecular attraction is defined as the distance between molecules at which their mutual forces become noticeably significant. The distance between two molecules at which the forces acting between them are of observable magnitude is known as the range of molecular attraction. The forces weaken as the molecular distance increases, eventually becoming insignificant.

In comparison to solids, liquids have a greater intermolecular distance. In other words, when something melts, the molecules spread apart more. As a result, intermolecular forces of attraction become weaker. First, a condensed molecular substance must be appealing. Gas molecules become more attracted to one another due to the increasing demand, which also increases the CE between molecules.

Thus, the first substance to melt is one with a lesser molecular attraction. The first substance to condense would be one with greater molecular attraction.

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Answer:

C. pH > pOH; Kw = 1.0 * 10^-14

Explanation:

The ion product of water, Kw = [H+]*[OH-] = 1.0 * 10^-14. It is a constant.

When an acid or base is added to water, its ion product does not change as it a constant. However, the relative concentrations of H+ ions and OH- ions will change depending on whether an acid or base is added to water.

When an acid is added to water, the concentration of H+ ions increases while that of OH- ions decreases, and vice versa.

Therefore, in the above situation where an acid is added to water, pH > pOH; Kw = 1.0 * 10^-14

Answer:

It's The Starlink Sattelite Launched By Space x

An enzyme can speed up a certain chemical reaction by all of the above ways mentioned. Option E is correct.

Enzymes are biological catalysts that increase the rate of chemical reactions without being consumed in the process. Enzymes work by binding to their substrates in a specific manner, which allows for the formation of an enzyme-substrate complex. The active site of the enzyme provides a suitable environment for catalysis, with the presence of acidic or basic residues, which can act as proton donors or acceptors to facilitate the reaction.

Additionally, enzymes can stabilize the highest energy part of the reaction, which is called the transition state. By stabilizing the transition state, the enzyme can lower the activation energy required for the reaction to occur. Enzymes can also expel water or unwanted reactants from the active site to prevent non-specific reactions from occurring. All of these mechanisms work together to speed up a certain chemical reaction and make it occur more efficiently. Option E is correct.

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Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Answer:

71%

Explanation:

Answer:

Explanation:

Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy.

Answer:

Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy.

Explanation:

Answer:

Where are the answer choices

?

Answer:

Tellurium

Explanation:

Technetium's position on the periodic table is 43 and Tellurium's is 52

Answer:

❤C. A liquad becomes a solid❤

Explanation:

✌When you freeze water its a scientific fact that it becomes solid.✌

Answer:

Barium, strontium and beryllium, all belong to the group 2. Silicon belong to group 14. Aluminium belong to group 13 and Osmium belong to group 8. Hence, the elements which have similar behavior are Barium, strontium and beryllium.

Explanation:

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