Based on this passage, do you think our stress response system helps or hurts people in their everyday lives? Use evidence to support answer.

The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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Answer:

Explanation:

How many atoms are in a 3.5 g sample of sodium (Na)? In this example, multiply the grams of Na by the conversion factor 1 mol Na/ 22.98 g Na, with 22.98g being the molar mass of one mole of Na, which then allows cancelation of grams, leaving moles of Na.

Answer:

ONE MOLE of any element has 6.023x1023 atoms of that element. Therefore 1 mole or 22.99 grams of Na = 6.023x1023 atoms of Na.

Explanation:

Given information:Temperature of the air in human lungs = 37 °CPartial pressure of water vapor = 5.5×10³ PaWe have to calculate the relative humidity of the air in the human lungs.

The relative humidity (RH) is the amount of moisture present in the air compared to the amount it can hold at the same temperature, expressed as a percentage. If the RH is 100%, the air is completely saturated with moisture, while if the RH is 0%, the air is dry.To solve the problem, we need to use the concept of the saturation vapor pressure. The saturation vapor pressure is the pressure of water vapor that exists in the air at a given temperature when the air is completely saturated with moisture.

At temperatures above freezing, the saturation vapor pressure increases as the temperature increases. We can use the vapor pressure curve for water to find the saturation vapor pressure at a given temperature. The curve shows the saturation vapor pressure (in Pa) for water as a function of temperature (in degrees Celsius).Now, let's find the saturation vapor pressure at 37 °C. According to the vapor pressure curve for water, the saturation vapor pressure at 37 °C is approximately 6.1×10³ Pa.

This means that if the partial pressure of water vapor in the air is less than 6.1×10³ Pa, the air is not completely saturated with moisture, and the relative humidity is less than 100%. If the partial pressure of water vapor is greater than 6.1×10³ Pa, the air is supersaturated with moisture, and the relative humidity is greater than 100%.However, in this problem, we are given that the partial pressure of water vapor is 5.5×10³ Pa, which is less than the saturation vapor pressure at 37 °C.

Therefore, we can find the relative humidity using the formula:Relative Humidity (RH) = (Partial Pressure of Water Vapor / Saturation Vapor Pressure) x 100%Putting the given values in the formula:RH = (5.5×10³ Pa / 6.1×10³ Pa) x 100%RH ≈ 90.2%Therefore, the relative humidity in the lungs is approximately 90.2%.

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α and β decay processes new elements.

The process by which unstable nuclei of radioactive atoms are becoming stable by emitting positive ions and energy is known as radioactive decay. Radioactive decay is classified into three types: alpha decay, beta decay, and gamma decay. Alpha and beta decay are processes that convert one element into another.

There seem to be three types of decays: α - decay, β – decay and γ – decay.

The nucleus loses two protons and two neutrons during alpha decay, resulting in the formation of a new element with just an atomic number that is two less than the original atomic number.

The new atomic number = the initial atomic number - 2

The neutron inside the core decays into one proton and one electron during beta decay, and the electron is emitted as a beta ray while the proton remains inside the nucleus.

As a result, it generates a new element with an atomic number that is one higher than the original atomic number.

The new atomic number = the initial atomic number + 1.

There is no change throughout charge or mass in the nucleus during gamma decay. As a result, the atomic number remains constant.

As a result, only α decay and β decay produce new elements.

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In Bohr's model of the atom, the level referred to as the ground state is the lowest energy level available to an electron in an atom.

Therefore, the correct answer is:

O lowest, most stable.

The ground state is considered the most stable configuration for an atom because the electron is in its lowest energy state. As electrons move to higher energy levels, the atom becomes less stable and more excited. It represents the atom with a single electron occupying the first shell, closest to the nucleus.

The Bohr model, also known as the Bohr atomic model, was proposed by Dani sh phy sicist Niels Bohr in 1913. It was one of the first successful attempts to describe the structure of atoms based on quantum theory.

The Bohr model presents a simplified picture of the atom, focusing on the electronic structure and energy levels of an atom.

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(a) The reaction with Delta H = 12.6 kJ/mol and Delta S = 93 J/K·mol is spontaneous at 25°C.

(b) The reaction with Delta H = 9.5 kJ/mol and Delta S = -94.0 J/K·mol is not spontaneous at 25°C.

To determine whether a reaction is spontaneous at a given temperature, we can use the Gibbs free energy equation: Delta G = Delta H - T·Delta S, where Delta G is the change in Gibbs free energy, Delta H is the change in enthalpy, Delta S is the change in entropy, and T is the temperature in Kelvin.

For a reaction to be spontaneous, Delta G must be negative. If Delta H is negative (exothermic) and Delta S is positive (increase in disorder), the reaction is more likely to be spontaneous.

(a) For the reaction with Delta H = 12.6 kJ/mol and Delta S = 93 J/K·mol, we have Delta G = 12.6 kJ/mol - (25 + 273) K·(93 J/K·mol/1000 J/kJ) = -5.25 kJ/mol. Since Delta G is negative, the reaction is spontaneous at 25°C.

(b) For the reaction with Delta H = 9.5 kJ/mol and Delta S = -94.0 J/K·mol, we have Delta G = 9.5 kJ/mol - (25 + 273) K·(-94.0 J/K·mol/1000 J/kJ) = 3.57 kJ/mol. Since Delta G is positive, the reaction is not spontaneous at 25°C.

To determine the minimum temperature at which a non-spontaneous reaction becomes spontaneous, we can set Delta G equal to zero and solve for T in the equation Delta G = Delta H - T·Delta S. However, in this case, both reactions are either spontaneous or non-spontaneous at 25°C, so we do not need to calculate the minimum temperature.

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Study of the absorption and emission of light and other radiation by matter, as related to the dependence of these processes on the wavelength of the radiation.

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Answer:

0.8833 mole of C3H8

Explanation:

Given:

Mass of C₃H₈ (Propane) = 38.95 gram

Computation:

Molar mass of C = 12.01

Molar mass of H = 1.008

Molar mass of C₃H₈ (Propane) = 3(12.01) + 8(1.008)

Molar mass of C₃H₈ (Propane) = 36.03 + 8.064

Molar mass of C₃H₈ (Propane) = 44.094

Number of mol in 38.95 gram Propane = Mass / Molar mass

Number of mol in 38.95 gram Propane = 38.95 / 44.094

Number of mol in 38.95 gram Propane = 0.88334

Answer:

Use the Periodic Table to find molar masses.

Propane (C3H8), a common fuel, reacts with oxygen to form carbon dioxide and water according to the equation below:

C3H8 + 5O2 → 3CO2 + 4H2O

If a propane heater burns 38.95 g C3H8, it consumes

38.95 mol C3H8.

0.8830 mol C3H8.

1 mol C3H8.

44.10 mol C3H8.

Part 2

How many moles of oxygen are required to produce 37.15 g CO2?

37.15 g CO2 = 1.407 mol O2

Part 3

What mass of propane is necessary to react with the amount of oxygen calculated in the previous question?

12.41   g C3H8    

Answer:

I think it is true

Explanation:

I just answer this question

Answer:

a).

Explanation:

precise electron locations cannot be calculated, only predicted based on previous calculations. they cannot know whether or not an electron will be or will not be somewhere specific

have a nice day!

The molar mass of a compound can be determined using the atomic masses of each element present and the number of their atoms. The molar mass of Ca(NO₃)₂ is 164 g/mol.

The molar mass of a compound is the mass of one mole of that compound. One mole of any compound contains 6.02 × 10²³ atoms. This number is called Avogadro number.

The given compound contains the elements Ca, N and O.

atomic mass of Ca = 40 g/mol

atomic mass of N = 14 g/mol

atomic mass of O = 16 g/mol.

mass of 3 O = 48 g.

then mass of NO₃ = 48 + 14 = 62 g.

The total mass of the compound = 40 g + (62 ×2) = 164 g.

Therefore, the molar mass of the compound Ca(NO₃)₂ is 164 g.

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Answer:

Explanation:

Pro – Low carbon. Unlike traditional fossil fuels like coal, nuclear power does not produce greenhouse gas emissions like methane and CO2. ...

Con – If it goes wrong… ...

Pro – Not intermittent. ...

Con – Nuclear waste. ...

Pro – Cheap to run. ...

Con – Expensive to build

C2H6 is the gas having the fastest‑moving molecules, on average, at a given temperature because of its lower molecular mass

With the chemical formula C 2H 6, ethane is an organic chemical substance. Ethane is a colourless and odourless gas at ordinary temperature and pressure. Ethane is separated from natural gas on an industrial scale, and it is produced as a by-product of the petrochemical process used to refine crude oil.

The mass of a certain molecule is its molecular mass, which is expressed in daltons. Because different isotopes of an element 30.07 g in 1 mole C2H6 are present in different molecules of the same chemical, their molecular weights might vary. As a result, we state that ethane has a molar mass of 30.07 g/mol (grammes per mole).

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Answer:

Carbon 16

Explanation:

Isotope of nitrogen

The question requires us to calculate the molecular mass of a gas, given its density (1.2 g/L) and conditions of pressure (745 torr) and temperature (20°C).

Density is defined as the mass of a compound over its volume. From this definition, we can calculate the molecular mass of the gas knowing the density, as given by the question, and the volume of 1 mol of the gas.

We can calculate the volume of a gas considering the equation of Ideal Gases:

where P is the pressure of the gas, V is its volume, n is the number of moles, R is the constant of gases and T is the temperature.

Note that the constant of gases R was given in units of L.atm/K.mol, while the pressure and temperature were given in Torr and °C, respectively. Thus we need to convert these values to the appropriate units.

Knowing that 1 Torr corresponds to 0.00131579 atm:

1 Torr --------------------- 0.00131579 atm

745 Torr ---------------- x

Solving for x, we have that 745 Torr corresponds to 0.980 atm.

To convert the temperature from Celsius degrees to Kelvin, we must add 273.15:

T = 20 + 273.15 K = 293.15 K

Therefore, the pressure and temperature we'll use in our calculation are 0.980 atm and 293.15 K. Also, since we are calculating the molecular mass, we'll consider 1 mol of gas.

Rearranging the equation of ideal gases to calculate the volume and applying the values to the equation, we'll have:

Therefore, the volume of 1 mol of the gas under the conditions given is 24.6L.

Next, we'll use this value to calculate the molecular mass using the density given by the question:

Therefore, the gas given by the question presents 29.5g per mol.

The final volume of the gas is approximately 57.242 mL.

To find the final volume of the gas, we can use the equation for work done by a gas at constant pressure:

Work = -PΔV

Where:

Work is the work done by the gas on its surroundings (given as 119.9 J),

P is the pressure of the gas (given as 783 torr), and

ΔV is the change in volume.

Since the pressure is constant, we can rearrange the equation to solve for ΔV:

ΔV = -Work / P

Plugging in the values:

ΔV = -119.9 J / (783 torr)

We need to convert the pressure from torr to atm to maintain consistent units:

ΔV = -119.9 J / (783 torr * (1 atm / 760 torr))

ΔV = -0.158 L

The negative sign indicates that work is done on the gas, causing it to expand. To find the final volume, we add the change in volume to the initial volume:

Final Volume = Initial Volume + ΔV

Final Volume = 57.4 mL + (-0.158 L)

Final Volume = 57.4 mL - 0.158 mL

Final Volume = 57.242 mL

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Answer: 0.002 m³

Explanation:

We can use our unit conversions to find the volume in m³.

\(2L*\frac{1m^3}{1000L} =0.002m^3\)

The rate constant increase by the factor of 4 when temperature is increased from 25C to 37C and activation energy is 85.6KJ. This can be solved using Arrhenius equation.

What is Arrhenius equation?

Arrhenius equation explains the relation between temperature and rate of the reaction for many chemical and physical reactions. It is given by,

k = A x e^(-Ea/RT)

where k = rate of the reaction, Ea = activation energy, R = gas constant, T = temperature.

The increase in the rate of the reaction can be calculated by Arrhenius reaction when the 2 different temperatures are given.

log k2/k1 = Ea / 2.303R [T2-T1 / T2T1] = 85.6 / 2.303 x 8.314 [ 310 - 298 / 310 x 298] = 4.

Therefore, by using Arrhenius equation, the increase in the rate of the reaction when the temperature increased from 25C to 37C is by a factor of 4.

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The vapor pressure of the solution when 0.25 moles of C₆H₁₄ is dissolved in 100 grams of water to form a solution is 17.73 torr.

To calculate the vapor pressure of the solution we need to use Raoult's law. Raoult's law states that the vapor pressure of the solvent over the solution is equal to the product of the mole fraction of the solvent in the solution and the vapor pressure of the pure solvent.

Vapor Pressure of Solution= Vapor pressure of solvent * Mole fraction of solvent

Mole Fraction of solvent= number of moles of solvent / total number of moles of solution

Number of moles of solvent = 100 g of water / Molar mass of water

Molar mass of water = 18g/mol

Number of moles of solvent = 100/18 = 5.55 moles

Number of moles of solute= 0.25

Mole fraction of solvent = 5.55/(5.55 + 0.25) = 0.956

Vapor Pressure of Solution = 18.52 * 0.956 = 17.73 torr

Therefore, the vapor pressure of the solution when 0.25 moles of C₆H₁₄ is dissolved in 100 grams of water to form a solution is 17.73 torr.

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The concentration of calcium hydroxide (in mol/L or g/L), I would be able to assist you in calculating the amount of calcium hydroxide present in the solution.

To determine the grams of calcium hydroxide (Ca(OH)2) in the solution, we need to use the pH and volume of the solution. However, we also require additional information about the concentration of calcium hydroxide in order to make a precise calculation.

The pH of a solution alone does not provide sufficient information to determine the concentration of calcium hydroxide. The pH is a measure of the concentration of hydrogen ions (H+) in a solution, while calcium hydroxide dissociates to produce hydroxide ions (OH-). Without the concentration of calcium hydroxide, we cannot directly calculate the grams of calcium hydroxide in the solution.

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Answer:

the answers for the quiz are;

1: A. appearance, composition

2: C. they link up in different ways

3: A. Shape

4: B. false

5: C. a chunky solid formed from two liquids combining

6: B. honey dissolving in tea

7: C. a red candy dissolves and turns water pink

8: liquid water becoming steam

9: D. A substance has changed chemically

10: A. a chemical change because the marshmallow changed in taste, color and smell

Explanation:

On the roasting of marshmallows, a chemical change takes place which changed their taste, color, and smell. Therefore, option (A) is correct.

A chemical change is a type of change in which the molecular composition is altered and a new substance is formed is known as a chemical change.

The changes are irreversible and permanent in chemical change. The mass of the substance is altered by adding or removing it during a chemical change.

During a chemical change, there is an energy difference in the breaking of old bonds and the formation of new bonds.

When marshmallows are roasted, a chemical change takes place. The heat causes a chemical reaction producing water molecules, which evaporate and leave carbon behind.

The marshmallow swells as the moisture inside expands, which causes the marshmallow to swell. when the moisture expands, it forms tiny holes in the marshmallow, which offer the moisture to escape as steam.

Then, the carbon present in sugar burns with the oxygen in the air. The blackened part of the marshmallow is the roasted carbon which changes the marshmallow's color.

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Three students measure the volume of a liquid using a graduated cylinder. in a separate experiment, the actual value volume of the liquid is 152 ml.

Student 3 set of data is the most precise

What is volume?

Generally, A volume is a measurement of the amount of space that is occupied in three dimensions. Quantification of it in terms of numbers often makes use of units derived from the SI or different imperial units. There is a connection between volu and the concept of length.

In conclusion, Using a graduated cylinder, three pupils determine the amount of a liquid that has been measured. In a different experiment, the volume of the liquid that was measured to be its real value was 152 milliliters.

The statistics collected from Student 3 are the most accurate.

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1 a

2 c

3d

4b

So this the answer that i got i dont know if it is right but if it is not i am sos orry

Answer:

21.09 g of AgCl

Explanation:

Hopefully the picture is clear and the method is understandable.

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Taking into account the Charles' law, the temperature of the gas if the volume drops to 75.0 L is 246 K or -27 C.

Charles' law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. This law says that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. That is, the volume is directly proportional to the temperature of the gas.

Mathematically, Charles' law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:

\(\frac{V}{T}=k\)

Considering an initial state 1 and a final state 2, it is fulfilled:

\(\frac{V1}{T1}=\frac{V2}{T2}\)

In this case, you know:

Replacing in Charles's law:

\(\frac{100 L}{328 K}=\frac{75 L}{T2}\)

Solving:

\(T2x\frac{100 L}{328 K}=75 L\)

\(T2=\frac{75 L}{\frac{100 L}{328 K}}\)

T2= 246 K= -27 C

Finally, the temperature of the gas if the volume drops to 75.0 L is 246 K or -27 C.

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By using Faraday's law of electrolysis, the number of moles of silver in the solution can be determined. From there, the molar mass of the silver salt can be calculated, allowing us to identify the silver salt and its formula.

Faraday's law of electrolysis relates the amount of substance deposited or liberated during electrolysis to the electric current passed through the solution. According to Faraday's law, the amount of substance (in moles) deposited is directly proportional to the product of the current (in amperes), time (in seconds), and the equivalent weight of the substance.

First, we calculate the number of moles of silver deposited:

moles of Ag = (current × time) / Faraday's constant

moles of Ag = (3.46 A × 704 s) / 96485 C/mol

Next, we can determine the molar mass of the silver salt:

molar mass of AgX = mass of AgX / moles of Ag

Given the mass of the silver salt (4.29 g) and the volume of water (520.0 mL), we can assume the density of water is 1 g/mL. Hence, the mass of the water is equal to its volume.

Finally, knowing the molar mass of AgX, we can identify the silver salt and its formula based on the molar mass and the periodic table.

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In the given reaction: Mg(s) + 2 HCl(aq) → MgCl(s) + H2(g) The correct statement about the reaction is: B) H is the reducing agent because it loses electrons.

Let's break down the given reaction and analyze the oxidation and reduction processes involved.

The reaction is: Mg(s) + 2 HCl(aq) → MgCl(s) + H2(g)

In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to produce magnesium chloride (MgCl) and hydrogen gas (H2).

To determine the oxidizing and reducing agents, we need to identify the species undergoing oxidation and reduction by looking at the changes in their oxidation states.

Oxidation involves an increase in oxidation state, while reduction involves a decrease in oxidation state.

Let's examine the oxidation states of the relevant elements:

Now, let's analyze the reaction:

Mg(s) + 2 HCl(aq) → MgCl(s) + H2(g)

Based on these observations, we can conclude the following:

Therefore, the correct statement is:

B) H is the reducing agent because it loses electrons.

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Answer:

Answer:- Density of the substance is 0.7

i believe

Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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Answer:

B: Oxygen and sugar react to give cells; water and carbon dioxide are its waste products.