which of the following is not an observed property of gases? group of answer choices gases have a variable shape gases have a high density gases mix uniformly gases compress and liquefy gases expand uniformly

Answer: D. Synthesis

Explanation:

Sodium Oxide + Water = Sodium Hydroxide

Full outermost electron shell makes these noble gases the least reactive gases in the periodic table.

The noble gases are the least reactive elements on the periodic table because they have a full outermost electron shell. This means that their outermost energy level is completely filled with electrons, making them very stable and unlikely to react with other elements to form compounds. Because they already have the maximum number of electrons possible in their outermost shell, they have no need to gain or lose electrons to achieve stability, which is why they are so unreactive.

Overall, the noble gases' stable electron configurations and their resulting low reactivity are the key factors that make them the least reactive elements on the periodic table.

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If the experiment is repeated at the pH 11 level, the enzyme activity will be less than at the pH 9 level.

We can arrive at this answer because:

In this case, we can say that if the experiment is repeated at pH 11, the enzyme activity level will be even lower, since from pH 5 onwards, as the pH rises, the enzyme activity goes down.

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The molarity of the given throat spray is 0.042 M.

Explanation :

What is Molarity?

Molarity is a measure of the concentration of a solute in a solution in terms of moles of solute per liter of solution. It is denoted by M or mol/L. It is calculated using the following formula:Molarity = Number of moles of solute / Volume of solution (in liters)

Calculating the Molarity

The throat spray has a density of 0.9956 g/mL. This means that 1 mL of the throat spray has a mass of 0.9956 g. Let the volume of the throat spray be V mL.

Therefore, the mass of the throat spray can be expressed as:

m = 0.0140 × V (since 1.40% mass phenol means 1.40 g of phenol in 100 g of solution)

Now, let's substitute the given values in the formula for molarity and simplify it:

Molarity (M) = Number of moles of solute / Volume of solution (in liters)

Number of moles of solute = Mass of solute / Molar mass

Molar mass of phenol (C6H5OH) = 6 × 12.01 g/mol (for C) + 5 × 1.01 g/mol (for H) + 16.00 g/mol (for O)= 94.11 g/mol (approx)

Molarity = Number of moles of solute / Volume of solution (in liters)= (0.000148 V) / (V / 1000)= 0.148 M/L= 0.042 M (approx.)

Therefore, the molarity of the given throat spray is 0.042 M.

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About 98% percentage of the oxygen from ambient air binds to hemoglobin molecules during oxygenation.

Hemoglobin is a iron-containing oxygen-transport metalloprotein present in our red blood cells that carries oxygen to our body's organs and tissues and transports carbon dioxide from your organs and tissues back to your lungs. It is abbreviated as Hb or Hgb.

The hemoglobin molecule has four binding sites for oxygen molecules. Binding of oxygen to the hemoglobin alters oxygen affinity by inducing structural changes in the adjacent globin chains. The percentage of oxygen from ambient air that binds to hemoglobin molecules during oxygenation is 98% .

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Answer:

b...............................

Answer:

b

Explanation:

can you solve this for me?

Entropy will change as a result of a change in the number of gas motes present in a response.

Entropy is the intensity present in the substance frame with steady pressure. The entropy change of the response goes up as the operative number goes up.

In a loose sense, entropy is a measure of energy quality, with lower entropy indicating advanced quality. The energy put down in a painstakingly requested manner( the effective library) has lower entropy.

Entropy is high in chaotically stored energy( the arbitrary-pile library). The substance's intelligence and molarity have a direct impact on the response's entropy.

It is known that the entropy increases when there are more intelligencers of the product.

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Answer:

ore is naturally occuring solid material from which a metal or valuable mineral can be extracted

profitably.

Answer:

29.85°C

Explanation:

0°K is absolute zero.  That is is same as -273.15°C.

To find C, subtract 273.15 from the temperature in °K.

303K - 273.15°C = 29.85°C

Answer:

A D F

Explanation:

look at attachment if you don't believe me

Answer:

Only Harry and Jena

Explanation:

Under federal regulations, an UST is any one or a combination of tanks such that the volume of an accumulation of regulated substances is 10% or more beneath the surface of the ground.

Any UST system holding a mixture of hazardous waste and other regulated substances are also are not covered by federal regulations regarding USTs.

Farm or residential tank of capacity more than 11 gallons used for storing motor fuel is covered by federal regulations regarding USTs.

According to the given question,

Only Harry and Jena are covered by federal regulations regarding USTs.

The new volume of a sample of gas initially occupying a 500 mL container at a pressure of 1.4 atm and a temperature of 25 °C is 281.01mL.

The volume of a gas can be calculated using the following formula:

P1V1//T1 = P2V2/T2

Where;

1.4 × 500/298 = 2.7 × V2/323

2.348 × 323 = 2.7V2

758.72 = 2.7V2

V2 = 281.009mL

Therefore, the new volume of a sample of gas initially occupying a 500 mL container at a pressure of 1.4 atm and a temperature of 25 °C is 281.01mL.

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Answer:

C. Fe will stay positive and increase in magnitude.

Explanation:

Coulomb's law states that the force of attraction of repulsion between two charged particles is directly proportional to the magnitude of their charges and inversely proportional to the square of the distance of separation between them.

This means that if the size of the charges are large, the force acting on them will be large as well. Also if the distance between the two charges increases the force decreases. However, the force increases when the distance of separation decreases.

Like charges repel, therefore, two negative charges brought together will repel each other, and the distance between the two charges decreases, the force will increase in magnitude. Forces of repulsion are considered positive, therefore, the force, Fe, will stay positive and increase in magnitude.

Answer:

Land is considered as an important resource as it provides habitation to a wide variety of flora and fauna. It is also used by human beings for various purposes such as agriculture, forestry, mining, building houses and roads, and setting up industries.

The molar concentrations of the two acids is Hcl = 0.4 M, NaOH = 0.3 M.

What is Molarity?

The ratio of the solute molecular weight to the length of the solution is known as molarity. By dividing the number of moles of HCl by the volume (L) of the solution in which it was dissolved, we may determine the molarity of the acid solution.

What is moles?

Chemists utilise a mole, a very significant unit of measurement. Similar to how having a dozen eggs indicates you have twelve eggs, having a mole of anything means you have 602,214,076,000,000,000,000,000 of that thing. When measuring extremely small objects like atoms, molecules, or other particles, chemists must use moles.

Let a be moles of Hcl

Let b be moles of H₂SO₄

and we are given total moles of acid to be 0.07

SO a+b= 0.07 ⇒ 1

acid to titration, if

NaOH reacts with Hcl = a moles of NaOH is required

If NaOH reacts with H₂SO₄ = 2b moles of NaOH are required

so and we are given

NaOH = 50 ml and 2 Hsol

no.of moles

nNaOH = 10/100 = 0.1 moles

so a+2b = 0.1 moles ⇒2

solving 1 and 2

b= 0.03 moles

b= 0.03

a= 0.04

molar acids of two concentrations are given

n Hcl = 0.04 moles

n NaOH = 0.03 moles

molar concentration of Hcl = 0.04* 100/100*100 = 0.4

Molarity of Hcl = 0.4 M

Molar concentration of NaOH = 0.03*100/100*100 = 0.3

Molarity of NaOH = 0.3 M

Therefore,  the molar concentrations of the two acids is Hcl = 0.4 M, NaOH = 0.3 M.

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Answer:

a. Same group, different period

b. Different group, same period

c. Different group, different period

d. Same group, different period

Therefore, the net ionic equation for the reaction is Copper(2+) (aq) + 2 chlorine- (aq) → Copper(II) chloride (aq).

Ammonium sulphate and Copper hydroxide precipitate are the first products of the reaction between copper sulphate and ammonium hydroxide.

Mixing copper(II) sulphate and ammonium chloride results in the following observations:

Conventional: When copper ions (Copper2+) from Copper(II) sulfate are present, a blue solution develops. The colour of Ammonium Chloride doesn't seem to have changed at all.

Ionic total: While Ammonium Chloride dissociates into Ammonium and Chlorine- ions in solution, Copper(II) sulfate dissociates into Copper2+ and Sulfate 2- ions.

Copper(II) sulfate (aq) + 2 Ammonium Chloride (aq) → Copper(II) Chloride (aq) + 2 Ammonium (aq) + Sulfate 2- (aq)

Net Ionic: The net ionic equation shows only the species involved in the reaction. In this case, the Copper2+ and the Cl- ions combine to form Copper(II) chloride.

Copper2+ (aq) + 2 Chlorine- (aq) → Copper(II) chloride (aq)

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you would need 4 liters of the 70% alcohol solution and 2 liters of the 40% alcohol solution to obtain 6 liters of a 60% alcohol solution.

Let's assume x liters of the 70% alcohol solution and (6 - x) liters of the 40% alcohol solution are mixed. The amount of alcohol in the 70% solution is 0.70x liters, and the amount of alcohol in the 40% solution is 0.40(6 - x) liters. These amounts must add up to the amount of alcohol in the final mixture, which is 0.60 * 6 liters. Setting up the equation: 0.70x + 0.40(6 - x) = 0.60 * 6 ,Simplifying and solving for x: x = 4. Therefore, you would need 4 liters of the 70% alcohol solution and 2 liters of the 40% alcohol solution to obtain 6 liters of a 60% alcohol solution.

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The equation q = mHΔv is used to calculate the amount of heat required to vaporize a certain amount of substance. In this case, the substance is water and the latent heat of vaporization is 2260 kJ/kg.

The variable q represents the amount of heat required to vaporize the substance, which is measured in joules (J) or kilojoules (kJ). The variable m represents the mass of the substance being vaporized, which is measured in kilograms (kg). Finally, the variable HΔv represents the latent heat of vaporization, which is a property of the substance and is measured in joules per kilogram (J/kg).

When water is heated, it will begin to evaporate, or turn into a gas. This process requires energy in the form of heat. The amount of heat required to vaporize a certain amount of water can be calculated using the equation q = mHΔv. For example, if we want to vaporize 1 kg of water, we can calculate the amount of heat required by multiplying the mass by the latent heat of vaporization:

q = 1 kg x 2260 kJ/kg
q = 2260 kJ

Therefore, it would require 2260 kJ of heat to vaporize 1 kg of water.

In summary, the equation q = mHΔv is a useful tool for calculating the amount of heat required to vaporize a substance, such as water. The latent heat of vaporization is a property of the substance and is required in order to make these calculations.

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The mass of the Mg is  0.1 g

Stoichiometry is the quantitative relationship between the reactants and products in a chemical reaction. It involves determining the mole ratios of the reactants and products based on the balanced chemical equation for the reaction.

To find the stoichiometry of a reaction, you need to start with a balanced chemical equation that shows the reactants and products and their respective coefficients. The coefficients in the balanced chemical equation represent the mole ratios of the reactants and products in the reaction.

The equation of the reaction is;

Mg + 2HCl ----> MgCl2 + H2

We know that;

1 mol of the H2 occupies 22400 mL

x  moles of H2 occupies 94.1 mL

x = 1 mol * 94.1 mL/ 22400 mL

x = 0.0042 moles

Now;

If 1 mole of Mg produces 1 mole of H2 then 0.0042 moles of Mg is required.

Hence the mass of Mg = 0.0042 moles * 24 g/mol

= 0.1 g

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The total pressure of the Heliox mixture is 1.1 atm, and the fraction of helium molecules is 0.68.

B. The total pressure of the Heliox mixture is the sum of the partial pressures of He and O2, which is 0.75 atm + 0.35 atm = 1.1 atm. The fraction of helium molecules is the ratio of the partial pressure of He to the total pressure, which is 0.75 atm/1.1 atm = 0.68.

To draw a particulate representation of Heliox that contains 10 particles, there would be 6 helium molecules (0.68*10 = 6.8, rounded to 6) and 4 oxygen molecules (10 - 6 = 4). This could be represented as 6 He particles and 4 O2 particles in a box.

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The fundamental idea behind Sahli's acid haematin technique is that hemoglobin is changed into acid haematin by the action of HCl, which results in a brown color.

The International Committee for Standardization in Haematology recommends the direct cyanmethaemoglobin method2 as the method that is most frequently used to estimate hemoglobin quantitatively. It is comparatively easy and inexpensive, because it involves the creation of cyanmethaemoglobin, a stable compound3. Blood's hemoglobin content can be found out using Sahli's method. The haemoglobin content of blood samples is determined using Sahli's haemoglobinometer by converting hemoglobin to hematin acid, which is then diluted to produce hematin acid that matches the comparator's color.

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Answer:

Micro, milli, deci, deca, mega

Explanation:

the suffix each denote the amount in comparison to a liter

Answer: False. Mechanical waves cannot travel through a vacuum.

Explanation:Type of wave that can travel through the vacuum of space - DOES NOT require a medium. ... False: A vacuum is empty space (no matter). Sound waves must have a medium (matter) in order to travel. Sound waves are mechanical waves.

a) The Lennard-Jones potential predicts the separation r_eq at the minimum energy U_min.

b) The U_min for this interaction at T=298 K is the value obtained from the Lennard-Jones potential equation when r=r_eq.

c) The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the attractive part (-A/r^6) to the total potential energy U_min.

d) The ratio of r_eq to r_0, where u(r_0)=0.4, can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

e) The ratio of r_s to r_0, where r_s is the separation where the magnitude of the attractive adhesion force is maximum, can be determined by finding the value of r where the derivative of the potential energy with respect to r is equal to zero.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the potential energy equation with respect to r and evaluating it at r=r_s.

a) The Lennard-Jones potential provides information about the relationship between energy and separation between two interacting atoms.

At the minimum energy (U_min), the potential predicts the separation r_eq, which corresponds to the equilibrium distance between the atoms. This is the distance at which the energy of the system is at its lowest point.

b) To determine the value of U_min at a given temperature (T=298 K), you can substitute the equilibrium separation r_eq into the Lennard-Jones potential equation and calculate the resulting energy value.

This will give you the U_min for the interaction.

c) The Lennard-Jones potential consists of two components: an attractive component (-A/r^6) and a repulsive component (B/r^12).

The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the magnitude of the attractive component to the total potential energy at the equilibrium separation.

This ratio provides insights into the relative contribution of the attractive force to the overall potential energy at equilibrium.

d) The ratio of r_eq to r_0 can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

In other words, you need to solve the Lennard-Jones potential equation for r_eq when the potential energy is equal to 0.4 times the potential energy at r=r_0.

e) The ratio of r_s to r_0 is obtained by finding the value of r where the magnitude of the attractive adhesion force is maximum.

This can be determined by finding the separation r where the derivative of the potential energy equation with respect to r is equal to zero.

The value of r_s represents the separation at which the attractive force between the atoms is strongest.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the Lennard-Jones potential energy equation with respect to r and evaluating it at r=r_s.

This will give you the magnitude of the maximum attractive adhesion force between the atoms.

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The effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

1. The class of drugs being investigated in this study is antidepressants. They enter our waterways through excretion by individuals taking the medication, and disposal of unused medication into toilets or sinks that are connected to wastewater treatment plants.

2. C-start is an evasive maneuver that young fish use when they perceive a predator. This is important for larval fish survival because it helps them to avoid being eaten by predators.

3. In this investigation, researchers are testing two hypotheses. The first is that exposure to low levels of antidepressants can affect larval fathead minnows' behavior, and the second is that the effects of exposure will be more pronounced in fish that have been raised in a less stressful environment.

4. The researchers found that exposure to antidepressants at levels found in waterways can have a significant impact on the behavior of larval fathead minnows. Specifically, they found that the fish exposed to antidepressants were less likely to respond to the presence of predators, which could increase their risk of being eaten.

They also found that the effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

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Explanation:

here's the answer to your question

13.41 moles are present in 2.20 kg of sodium phosphate.

A mole is defined as 6.02214076 × \(10^{23}\)of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

The molar mass of sodium phosphate is 163.94 g/mol.

2.20 kg = 2200g

\(Moles = \frac{2200g}{163.94 g/mol.}\)

Moles = 13.41954374 = 13.41 moles

Hence, 13.41 moles are present in 2.20 kg of sodium phosphate.

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Answer: 121.95587 g/mol

Explanation:

Therefore, the molecular mass is:

\(26.98154 +30.97673 +4(15.9994)=\boxed{121.95587 \text{ g/mol}}\)

Answer:

4

Explanation:

Speed=Distance/time, so 20/5 divide time divided by distance. so the answer is 4.

The speed of Haley the hummingbird is 4 m/s.

From the question,

We are to calculate the speed of Haley the hummingbird

Speed is given by the formula

\(Speed =\frac{Distance\ traveled}{Time\ taken}\)

From the given information,

The hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.

That is,

The bird can cover a distance of 20 meters in 5 seconds.

Therefore,

Speed of the hummingbird = \(\frac{20}{5}\)

Speed of the hummingbird = 4 m/s

Hence, the speed of Haley the hummingbird is 4 m/s.

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