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Answer:

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Answer:A, Both reactivity and electronegativity decrease down a group.

Explanation: As you go down the periodic table they both will decrease

The stroke volume in the next few cardiac cycles will be 100 ml if the end-diastolic volume is increased from 135ml to 165m.

The formula for stroke volume is given as;

SV = EDV - ESV

Here SV represents stroke volume, EDV represents end-diastolic volume and ESV represents end-systolic volume.

First, we calculate this person's end-systolic volume as follows;

If the person’s stroke volume was 70ml and his initial diastolic volume was 135 ml, then:

70 = 135 - ESV

70 - 135 = -ESV

-65 = -ESV

ESV = 65ml

Now the stroke volume in the next few cycles if the end-diastolic volume increase to 165 ml can be calculated as follows;

SV = 165 - 65

SV = 100ml

Therefore, the stroke volume in the next few cardiac cycles is calculated to be 100ml.

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Scientific theories are testable. A theory may be changed as a result of new lines of evidence that change their assumptions.

A Scientific theory is a well sustained explanation about a given question of the real world that is based on testable (i.e., verifiable through experimentation and or observation) information that was obtained by using the scientific method.

Therefore, with this data, we can see that Scientific theories are testable because they can be proved or refuted by experimentation and or observational procedures, which are fundamental parts of the scientific method.

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When you turn the transmitter so that charges move in a east-west direction, the polarization of the resulting electromagnetic waves will change.

Polarization is the orientation of the electric field vector of an electromagnetic wave. In electromagnetic wave generated by north-south current in a wire, electric field vector will be oriented in an east-west direction. If the current in the wire is moving in east-west direction, the electric field vector of resulting electromagnetic wave will be oriented in a north-south direction.

So, if you change the direction of electric charges in the wire,  polarization of the resulting electromagnetic waves will change.

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Answer: Li2O would produce a basic solution.

Explanation:

Li makes LiOH and is a strong base which means it does not hydrolyze and creates a neutral ion. O2 is then shown as the weak acid, making it a conjugate base. Neutral + Basic = Basic soltuion

Answer:

A stable atom has a net charge of 0. In other words, it has an equal number of protons and electrons. ... When the number of electrons does not equal the number of protons, the atom is ionized.

Explanation:

The atom is then called an ion.

The number of moles in container 2 is 33.3moles when the container has 27.32L of gas inside it

The number of moles of gas in container 2 can be calculated using the Ideal Gas Law:  

n = PV/RT  

where n is the number of moles of the gas with known volume,

P is the pressure (assumed to be 1 atm for ideal gases),

V is the volume (27.32 liters),

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

T is the temperature (assumed to be 273.15 K).  

Plugging in the values, we get:  

n = (1 atm)(27.32 L)/(0.0821 L·atm/mol·K)(273.15 K)

n = 33.3 mol  

Therefore, there are 33.3 moles of gas in container 2.

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Answer:

The 2 subatomic particle responsible for determining the neutrality of an a to! are protons and electrons.

Part A: Ru3+ The electron configuration for Ru is [Kr]5s^24d^6. To form Ru3+, three electrons are removed. Therefore, the electron configuration for Ru3+ is [Kr]4d^5.

Part B: As3-

The electron configuration for As is [Ar]4s^23d^104p^3. To form As3-, three electrons are gained. Therefore, the electron configuration for As3- is [Ar]4s^23d^104p^6.

Part C: Y3+

The electron configuration for Y is [Kr]5s^24d^15p^1. To form Y3+, three electrons are removed. Therefore, the electron configuration for Y3+ is [Kr]4d^0.

Part D: Pd2+

The electron configuration for Pd is [Kr]5s^04d^10. To form Pd2+, two electrons are removed. Therefore, the electron configuration for Pd2+ is [Kr]4d^8.

Part A: Ru3+

The electron configuration for Ru is [Kr]5s^24d^6. To form Ru3+, three electrons are removed. This means that the 5s orbital is emptied and one electron is removed from the 4d orbital. Therefore, the electron configuration for Ru3+ is [Kr]4d^5. This configuration indicates that there are 5 electrons in the 4d orbital.

Part B: As3-

The electron configuration for As is [Ar]4s^23d^104p^3. To form As3-, three electrons are gained, filling up the 4p orbital. Therefore, the electron configuration for As3- is [Ar]4s^23d^104p^6. This configuration indicates that there are 6 electrons in the 4p orbital.

Part C: Y3+

The electron configuration for Y is [Kr]5s^24d^15p^1. To form Y3+, three electrons are removed. This means that the 5s and 4d orbitals are emptied. Therefore, the electron configuration for Y3+ is [Kr]4d^0. This configuration indicates that there are no electrons in the 4d orbital.

Part D: Pd2+

The electron configuration for Pd is [Kr]5s^04d^10. To form Pd2+, two electrons are removed, leaving the 5s and 4d orbitals empty. Therefore, the electron configuration for Pd2+ is [Kr]4d^8. This configuration indicates that there are 8 electrons in the 4d orbital.

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Answer:

True

Explanation:

The entropy of a system denoted by S is a thermodynamic function that increases in value when there are more ways to arrange the particles in the system. Some spontaneous chemical processes are entropy driven. An increase in entropy is said to drive the dissolution of ionic salts along with the evaporation of water are related to the spreading out of energy.

The entropy of a system can be taken as a measure of disorder of a system. In a spontaneous chemical process, the entropy of the universe is said to increase. ΔSunivu>0. Making the answer true.

1) Chemical formula

2) Mg Lewis structure

3) O2 Lewis structure

4) MgO Lewis structure

5) Chemical formula written as Lewis dot structure

.

At over 1700 miles thick the lower mantle contains superheated rocks and minerals.

The mantle is the mostly-solid bulk of Earth's interior. The mantle lies between Earth's dense, super-heated core and its thin outer layer, the crust.

As Earth began to take shape about 4.5 billion years ago, iron and nickel quickly separated from other rocks and minerals to form the core of the new planet. The molten material that surrounded the core was the early mantle.

The lower mantle extends from about 660 kilometers (410 miles) to about 2,700 kilometers (1,678 miles) beneath Earth’s surface. The lower mantle is hotter and denser than the upper mantle and transition zone.

Therefore, at over 1700 miles thick the lower mantle contains superheated rocks and minerals.

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The most common way of preventing bumping is by adding one or two boiling chips to the reaction vessel. However, these alone may not prevent bumping and for this reason it is advisable to boil liquids in a boiling tube, a boiling flask, or an Erlenmeyer flask.

Answer:

Hey mate.....

Explanation:

This is ur answer.....

Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.

Hope it helps!

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The mass (in grams) of ammonia, NH₃ that will be produced when 5 moles of hydrogen reacts is 56.61 grams

First, we shall obtain the moles of ammonia produce from the reaction. Details below:

N₂(g) + 3H₂(g) -> 2NH₃(g)

From the balanced equation above,

3 moles of H₂ reacted to produce 2 moles of NH₃

Therefore,

5 moles of H₂ will react to produce = (5 × 2) / 3 = 3.33 moles of NH₃

Finally, we shall determine the mass of ammonia, NH₃ produced from the reaction. Details below:

Mole = mass / molar mass

Cross multiply

Mass = Mole × molar mass

Mass of ammonia, NH₃ = 3.33 × 17

Mass of ammonia, NH₃ = 56.61 grams

Thus, the mass of ammonia, NH₃ is 56.61 grams

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Answer:neutralization

Explanation:The reaction of an acid with a base is called a neutralization reaction. The products of this reaction are a salt and water.

Answer:

neutralization

Explanation:

i think

Answer: chemical bond

Explanation:

The chemical bond simply refers to the electrostatic attraction that can be found between ions that are oppositely-charged. It should be noted that the chemical bond occurs due to the transfer of electrons that is being found between atoms.

Therefore, based on the question given, the electrostatic attraction that is seen between a positively charged nuclei and the negatively charged electrons which hence allows two atoms to be held together is the chemical bond.

The percentage of chloride in the unknown sample is approximately 15.93%.

To calculate the percentage of chloride in the unknown sample, you can use the mass of silver chloride obtained to determine the number of moles of chloride in the original sample, and then convert that to a percentage.

First, calculate the number of moles of silver chloride by dividing the mass by its molar mass:

0.7332 g / 143.32 g/mol = 0.00513 mol AgCl

Next, calculate the number of moles of chloride in the original sample by assuming a 1:1 ratio of chloride ions to silver ions in the reaction:

0.00513 mol AgCl * 1 Cl- / 1 Ag+ = 0.00513 mol Cl-

Finally, divide the number of moles of chloride by the mass of the original sample and multiply by 100 to convert to a percentage:

(0.00513 mol Cl- / 0.3221 g) * 100 = 15.93%

So, the percentage of chloride in the unknown sample is approximately 15.93%.

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The rate constant for this reaction at 298 K is approximately 3.84 * 10^12.

The activation energy (Ea), the frequency factor (A), and the temperature (T) in Kelvin.

The Arrhenius equation is given by:

k = A * e^(-Ea / (R * T))

where:

k is the rate constant

A is the frequency factor

Ea is the activation energy

R is the gas constant (8.314 J/(mol*K))

T is the temperature in Kelvin

Given:

Ea = 42.0 kJ/mol = 42,000 J/mol (converted from kg/mol to J/mol)

A = 8.0 * 10^10

We need to convert the temperature from Celsius to Kelvin:

T = 298 K

Now we can calculate the rate constant:

k = (8.0 * 10^10) * e^(-42,000 J/mol / (8.314 J/(mol*K) * 298 K))

k ≈ 3.84 * 10^12

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Answer:   12.55 C

Explanation:

The relationship between gas volume and temperature is described by the Ideal Gas Law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

P1V1 = nRT1 (initial conditions)

P2V2 = nRT2 (final conditions)

Since the number of moles is constant, we can set nRT1 equal to nRT2:

P1V1 = P2V2

We can rearrange this equation to solve for the final temperature:

T2 = (P1V1/T1) * V2/P2

Substituting the given values:

T2 = (1 atm * 0.675 L / 308.15 K) * (0.635 L / 1 atm)

where we converted the initial temperature of 35 C to Kelvin by adding 273.15 K.

Simplifying and solving for T2:

T2 = 285.7 K - 273.15 K

T2 = 12.55 C

Therefore, the temperature of the room where the gas has a volume of 0.635 L at 1 atm is approximately 12.55 C.

According to law of conservation of mass, mass is neither created nor destroyed rather it is restored at the end of a chemical reaction.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

In reality,conservation of mass provides approximation  and is a part of classical mechanics.At the end of chemical reaction, the mass of reactants and products is same.

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Answer:

measuring the isotopic composition of atmospheric co2 shows that the burning of fossil fuels has led to the co2 levels over the last 200 years.

Explanation:

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To calculate the amount of sylvanite needed to obtain 66.0 g of gold, we can use the fact that sylvanite contains 28.0% gold by mass.

Let's assume the mass of sylvanite needed is x grams.

The amount of gold in the sylvanite can be calculated by multiplying the mass of sylvanite (x) by the percentage of gold it contains (28.0% or 0.28):

Gold in sylvanite = x * 0.28

According to the problem, we want to obtain 66.0 g of gold. Therefore, we can set up the equation:

x * 0.28 = 66.0

To solve for x, we divide both sides of the equation by 0.28:

x = 66.0 / 0.28

Performing the calculation:

x = 235.71 g

Therefore, you would need to dig up approximately 235.71 grams of sylvanite to obtain 66.0 grams of gold.

To obtain 66.0 grams of gold, you would need to dig up approximately 235.71 grams of sylvanite.

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The enthalpy of the reaction is 14 J/mol.

The enthalpy of a reaction (ΔH) is the amount of energy transferred between a system and its surroundings during a chemical reaction at constant pressure, measured in joules per mole (J/mol). This value is important because it can tell us whether a reaction is exothermic or endothermic, as well as give us information about the strength of chemical bonds within the reactants and products.To calculate the enthalpy of a reaction, we need to know the amount of energy released or absorbed (Q) and the number of moles of the compound involved in the reaction (n). We can use the equation:
ΔH = Q/n
Given that 6 moles of a compound produce 84 J of energy, we can calculate the enthalpy of the reaction as follows:
ΔH = Q/n
ΔH = 84 J / 6 mol
ΔH = 14 J/mol
This means that for every mole of the compound involved in the reaction, 14 J of energy is transferred between the system and the surroundings. Since the value is positive, we can conclude that the reaction is endothermic, meaning that it requires an input of energy to occur.It is worth noting that the enthalpy of a reaction can depend on a number of factors, such as temperature, pressure, and the specific conditions under which the reaction occurs. As such, it is important to take these factors into account when calculating or predicting enthalpy values.

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16.95g is the mass of ethanol (C2H60) that are required to produce 1,000 kJ during boiling? The heat of vaporization of ethanol is 38.6 kJ / mole.

The most fundamental characteristic of matter is mass, which is one of the basic quantities in physics. Mass is a term used to describe how much matter is there in a body. The kilogramme (kg) is the international standard of mass. A nuclear reaction, for instance, results in the total weight of the substance being reduced as a tiny quantity of matter is transformed into a very large amount of energy.

moles of ethanol = 38.6/  1,000=0.368moles

molecular weight of ethanol =46.07g/mol

mass = 0.368×46.07

         = 16.95g

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The result table indicate that A. The solute is a SOLID because it has a DECREASE in the amount dissolved as temperature decreases.

The solubility of a solid solute in a liquid solvent generally decreases as the temperature decreases. This is because the kinetic energy of the solute molecules decreases as the temperature decreases. As the kinetic energy of the solute molecules decreases, they are less likely to have enough energy to escape from the solution and enter the gas phase.

In the table, as the temperature decreases, the concentration of the solute in the solution decreases. This indicates that the solute is a solid and that the solubility of the solute decreases as the temperature decreases.

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