What happens to the atomic radius when an electron is lost?
A. The positive ionic radius is the same size as the neutral atomic
radius.
B. The positive ionic radius does not follow a trend with the neutral
radius.
C. The positive ionic radius is smaller than the neutral atomic radius.
D. The positive ionic radius is larger than the neutral atomic radius.

The statement that is false is that; the system does work on the surroundings. Option B

We know that the term heat would have to do with the energy that is supplied in the reaction. Now we know that from the first law of thermodynamics, energy would neither be created nor destroyed but is converted from one form to another.

Given that;

ΔE = q + w

ΔE = change in internal energy

q = heat absorbed

w = heat evolved

Then we have;

ΔE = - 17 + 21

=  +4 kJ

Thus the change in the internal energy is +4 kJ.

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The chlorine molecules, cl2, would behave if mixed with water is best described by the polarity concept.

Polarity is a phenomena by which the dissolving power of any molecule can be known if they are polar will completely dissociate in water and if non polar will partially dissociate in water

Here chlorine is very poorly dissolve in water due to its non polar nature and water is polar. Some compounds are polar for short time of period and attend a partially positive and a partially negative charge within them.

Therefore,  Cl2 is a non polar compound describes the polarity.

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Explanation:

To find the isotope that is expected to be radioactive we have to compare the given isotopes with the ones that we find the in the periodic table.

(A) Ti:

Isotope ----> atomic mass = 48 atomic number = 22

Periodic table ---> average atomic mass = 47.9 atomic number = 22

(B) Sr:

Isotope ----> atomic mass = 88 atomic number = 38

Periodic table ---> average atomic mass = 87.6 atomic number = 38

(C) Os:

Isotope ----> atomic mass = 192 atomic number = 76

Periodic table ---> average atomic mass = 190.2 atomic number = 76

(D) Pu:

Isotope ----> atomic mass = 244 atomic number = 94

Periodic table ---> average atomic mass = 244 atomic number = 94

If we take a look at them we will see that the only one that is different is osmium. The atomic mass of the isotope is 192 amu, that means that this isotope has 2 more neutrons than the average atom of the element. So we can expect that it could be radioactive.

Answer: C. Os

The release of neurotransmitters into the synapse is initiated by depolarization, which opens Ca2+ channels, allowing Ca2+ to move vesicles to the synaptic membrane.

This is the correct answer.When an action potential (AP) arrives at the axon terminal, it results in the opening of voltage-gated Ca2+ channels. The influx of Ca2+ into the nerve terminal causes the exocytosis of neurotransmitter-containing vesicles into the synaptic cleft. Calcium influx is thought to trigger neurotransmitter release via a mechanism that involves Ca2+ binding to the vesicle-associated protein synaptotagmin 1 (Syt1), which promotes the interaction of vesicles with the presynaptic membrane.The entry of Ca2+ through voltage-gated calcium channels is critical for neurotransmitter release, and its absence leads to severe neurological disorders such as ataxia and epilepsy. Calcium ion (Ca2+) is one of the most crucial signaling molecules in cells and is essential for many physiological functions, including neurotransmitter release. Calcium ions activate synaptic vesicle fusion and neurotransmitter release by binding to specific proteins in the active zone of the nerve terminal.

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The energy required for the complete removal of 1 mol electron from an atom or ion in the gaseous state is known as ionization energy.

What is Ionization Energy?

Ionization energy is a physical value that determines the amount of energy required to remove an electron from a gaseous atom or ion. When an electron is completely removed from an atom, it transforms into an ion. Therefore, ionization energy is also known as ionization potential.

An example of ionization energy can be, the ionization energy of sodium is the quantity of energy required to remove one electron from a sodium atom in the gaseous state.

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Answer:

the fastest would be gas, liquid would be in the middle and solid would be the slowest

Explanation:

The hcl(aq) solution has a lower concentration than what is indicated on the reagent bottle. This will result in fewer moles of base in the antacid.

What is the HCI solution's concentration?

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Hexane is a type of hydrocarbon that consists of six carbon atoms surrounded by 14 hydrogen atoms

Work required = 30J

This is because work = F * x

F (Newton's force) = 3N

x (car moved) = 10m

Work = 3 * 10 = 30J

Answer: Sulfuric acid

Explanation: Sulfuric acid is a colorless oily liquid. It is soluble in water with release of heat. It is corrosive to metals and tissue.

The three things that are needed for precipitation to form are water vapor, lifting action, and freezing temperatures. When warm moist air is lifted, it cools and condenses into clouds.

If the air continues to cool and the temperature drops below freezing, the water droplets freeze and become ice crystals.

These ice crystals then collide and merge with other ice crystals, forming larger snowflakes or hailstones. Finally, when these snowflakes or hailstones become too heavy to be supported by the updrafts in the cloud, they fall to the ground as precipitation.

Additional terms such as convective turning, growth process, and steady rotation of wind may also contribute to the formation of precipitation in certain weather conditions.

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The percent yield of isopentyl acetate is 71.23% when reacting 4.4 ml f acetic acid with 3.35 ml of isopentyl alcohol

Percentage yield can be defined as the ratio of the actual yield of a reaction to the theoretical yield of a reaction, multiplied by 100.

The percentage yield is calculated as follows:

Given data:

Volume of acetic acid used = 4.40 ml

Volume of isopentyl alcohol used = 3.35 ml

Volume of isopentyl acetate obtained = 3.25 ml

Density of acetic acid = 1.049 g/mL and its molar mass = 60.05 g/mol

Density of isopentyl alcohol = 0.809 g/mL and its molar mass = 88.15 g/mol

Density of isopentyl acetate = 0.876 g/mL and its molar mass = 130.19 g/mol

The balanced chemical equation for the reaction is:

C5H11OH + CH3COOH → CH3COOC5H11 + H2O

First, we need to determine which reactant is the limiting reactant. We can do this by calculating the number of moles of each reactant:

The mole ratio of acetic acid to isopentyl alcohol in the reaction is 1:1, so the limiting reactant is isopentyl alcohol because there are fewer moles of it.

The theoretical yield of isopentyl acetate can be calculated from the number of moles of limiting reactant:

Now we can calculate the percent yield:

The actual yield is given as 3.25 mL of isopentyl acetate, but we need to convert this to moles:

Therefore, the percent yield of isopentyl acetate is 71.23%.

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According to the USDA, to be considered part of the BioPreferred Program, a product must contain a minimum of 25% organic carbon (based on its total carbon content).

This percentage is used to determine if the product is composed primarily of biological or renewable materials, which is a key criterion for inclusion in the program.. This organic carbon is generally derived from plant, animal, microbial, or other biological sources. The organic carbon content is determined by measuring the organic carbon in the product, which is typically done with an organic carbon analyzer. The organic carbon content of a product must meet or exceed 25% of the product's total carbon content in order for it to be considered part of the Biopreferred Program.

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Answer:  Solubility.

Explanation:

Solubility is defined as the maximum amount of solute dissolved per 100 g of the solvent at a certain fixed temperature to form a saturated solution.

STP condition is Standard Temperature and Pressure condition which is  temperature of 273 K and pressure of 1 atm.

Thus the scientific term for "the number of grams of solute dissolved in 100 g of the solvent to form a saturated solution at STP​" is called as Solubility.

Answer:

an element with a large number of valence electrons and a large atomic radius

Explanation:

Electronegativity means a tedency when an atom attracts bonding electrons in a covalent bond situation.

» If an atom has many valency electrons [ empty orbitals in outermost shell ], it has difficulty in attracting electrons hence electronegativity low.

» If an atom is large, its nuclear attraction force of incoming electrons is low hence low electronegativity.

\(.\)

The element that would have the lowest electronegativity is an element with a small number of valence electrons and a large atomic radius.

Both electronegativity and atomic radius are periodic trends. Electronegativity increases across the period while atomic radius decreases across a period.

An element that has a small number of valence electrons and a large atomic radius will most likely be a metal hence it will have the lowest electronegativity.

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Answer:

B.) The sound waves are reflected.

Explanation:

On edge,

i also answered so the other person could get the brainliest

Answer:

b

Explanation:

Answer:

E=mc^2 is correct answer, last one

Explanation:

Hope it will help you

The essential conditions for pressure are high temperature and minimum volume.

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.

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Answer:

the answer is half arrow

Answer:

D

Explanation:

according to boyle's law the temperature and pressure of a gas are inversely proportional given by the equation

p1v1=p2v2

In this case p1 is 9.5,v1 is 1.7,v2 is 1.1 and we have to find p2

9.5×1.7=p2×1.1

16.15/11=1.1p2/1.2

p2=14.7

I hope this helps

Answer:

\(\boxed {\boxed {\sf D.\ 14.7 \ atm}}\)

Explanation:

We are asked to find the pressure on a gas given a change in volume. We will use Boyle's Law which states the volume of a gas is inversely proportional to the pressure. The formula for this law is:

\(P_1V_1=P_2V_2\)

The gas originally has a pressure of 9.5 atmospheres and a volume of 1.7 liters.

\(9.5 \ atm * 1.7 \ L = P_2V_2\)

The gas is compressed to a volume of 1.1 liters, but the pressure is unknown.

\(9.5 \ atm * 1.7 \ L = P_2* 1.1 \ L\)

We want to find the new pressure, so we must isolate the variable P₂. It is being multiplied by 1.1 liters. The inverse operation of multiplication is division. Divide both sides of the equation by 1.1 L.

\(\frac {9.5 \ atm * 1.7 \ L}{1.1 \ L} =\frac{ P_2* 1.1 \ L}{1.1 \ L}\)

\(\frac {9.5 \ atm * 1.7 \ L}{1.1 \ L} =P_2\)

The units of liters cancel.

\(\frac {9.5 \ atm * 1.7 }{1.1 } =P_2\)

\(\frac {16.15}{1.1} \ atm =P_2\)

\(14.6818181818 \ atm= P_2\)

Round to the tenths place. The 8 in the hundredth place tells us to round the 6 up to a 7.

\(14.7 \ atm \approx P_2\)

The new pressure at a volume of 1.1 liters is approximately 14.7 atmospheres.

Answer:

MA'AM I BELIVEVE THE ANSWER IS Z

HOPE THIS HELPS

Explanation:

-TJ

The pH of the solution before the addition of any HNO₃ can be determined using the pKa of NH₃ and the Henderson-Hasselbalch equation.

To determine the pH of the solution before the addition of any HNO₃, we can use the pKa of NH₃ (ammonia) and the Henderson-Hasselbalch equation.

The pKa of NH₃ is related to its Kb (base dissociation constant) by the equation pKa + pKb = 14. In this case, we can calculate the pKa of NH₃ by subtracting the pKb value from 14.

The Kb value of NH₃ can be calculated using the Kw (water dissociation constant) and the given pKw value of 14. At 25°C, Kw = 1.0 x 10^-14, and since Kb x Ka = Kw, we can find Kb by dividing Kw by Ka.

Given that Ka = 1.8 x 10^-5, we can calculate Kb by Kb = Kw / Ka = (1.0 x 10^-14) / (1.8 x 10^-5).

Now that we have the Kb value, we can find the pKb value by taking the negative logarithm (base 10) of Kb.

Next, we can use the Henderson-Hasselbalch equation: pH = pKa + log ([A⁻] / [HA]), where [A-] is the concentration of the conjugate base (NH⁴⁺) and [HA] is the concentration of the weak acid (NH₃).

Since we know the initial concentration of NH₃ (0.25 M), and assuming it is fully ionized, the concentration of NH⁴⁺ is also 0.25 M.

Using the calculated pKb value and the concentrations, we can substitute these values into the Henderson-Hasselbalch equation to find the pH of the solution before the addition of any HNO₃.

Note: It is important to remember that this calculation assumes that the NH₃ solution is not buffered by any other substances. If there are other buffering agents present in the solution, their effects should be taken into account for a more accurate pH calculation.

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The type of system that uses circulating pumps and fans to collect and distribute heat is called a "hydronic heating system" or "forced air heating system."

In a hydronic heating system, circulating pumps are used to circulate heated water or another fluid through pipes or tubing. The heated fluid transfers heat to various components of the system, such as radiators, baseboard heaters, or radiant floor heating systems. The pumps ensure that the hot fluid is continuously circulated, maintaining a consistent and comfortable indoor temperature.

On the other hand, a forced air heating system utilizes fans or blowers to distribute heated air throughout a building. The system typically consists of a furnace or heat pump that heats the air, and the heated air is then pushed through a network of ducts using fans or blowers. The air is directed to various rooms or areas through registers or vents, providing warmth and comfort.

Both hydronic heating systems and forced air heating systems are commonly used in residential, commercial, and industrial buildings to provide efficient and effective heating. The specific type of system chosen depends on factors such as the heating requirements, building design, energy efficiency goals, and personal preferences.

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Answer:

1 and 3

Explanation:

Answer: A and B or 1 and 3

Explanation:

The Ka of chloroacetic acid is equal to 2.1 x 10⁻². The Ka for chloroacetic acid can be determined from the measured pH of a 0.11 M solution of chloroacetic acid.

To determine the value of Ka for chloroacetic acid (CH2ClCOOH), we can use the pH of the solution and the initial concentration of the acid. The equation for the dissociation of chloroacetic acid is:

CH2ClCOOH(aq) + H₂O(l) ⇌ CH2ClCOO-(aq) + H₃O+(aq)

At equilibrium, we can assume that x is the concentration of the hydronium ion (H₃O+) and the acetate ion (CH2ClCOO-), which will be equal since the acid is monoprotic. Therefore, the concentration of CH2ClCOO- will also be x. The initial concentration of CH2ClCOOH is 0.11 M.

The equilibrium expression for Ka is given by:

Ka = [CH2ClCOO-][H₃O+]/[CH2ClCOOH]

Substituting the equilibrium concentrations, we have:

Ka = (x)(x)/(0.11 - x)

Given that the pH of the solution is 1.91, we can calculate the concentration of H₃O+ using the relationship:

pH = -log[H₃O+]

1.91 = -log[H₃O+]

[H₃O+] = 10^(-pH)

[H₃O+] = 10^(-1.91)

[H³O+] ≈ 7.94 × 10⁻² M

Since the concentration of H3O+ is equal to x, we can substitute this value into the equilibrium expression:

Ka = (7.94 × 10⁻²)(7.94 × 10⁻²)/(0.11 - 7.94 × 10⁻²)

The Ka of chloroacetic acid is equal to 2.1 x 10⁻².

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Answer:01

When you describe nature, and you need standard, useful units for everything you will see that these units are linked. So you start with defining base units that are simple:

kg, meter, second, Kelvin, …

Now other units will be automatically derived:

speed = distancetime , so the unit is  ms  

acceleration =  speedincreasetime , so the unit is  ms2  

Force = Mass x acceleration, so the unit is  kg.ms2  

Pressure is Force/surface, so the unit is  kgm.s2  

You can define new simple units for this, but they are still derived from the base units:

Force:  1N=1kg.ms2  

Pressure:  1Pa=1kgm.s2

2 Answer

In mechanics, work is defined as “force x distance”. Since energy can be measured as work, we can write energy = force x distance. Thus SI derived unit of energy has the units of newtons x meter or kg m2/s

Answer:

The nuclei of most atoms also contain neutrons . The masses of subatomic particles are very tiny. ... Since the nucleus contains protons and neutrons, most of the mass of an atom is concentrated in its nucleus. Protons and electrons have electrical charges that are equal and opposite.

There are 2 places where charge is located in the atom:

the nucleus contains neutrons (zero charge) and protons (positive charge)

Around the nucleus there are electrons located on electron shields and the charge of electrons is equal to the charge of protons in the nucleus, but have negative sign.

To sum it all up we can say that the charge of protons in the nucleus is reduced by the charge of electrons on the orbits to make the atom electrically neutral.

How many liters of oxygen gas were used up?

If 185 g of wax \(C_{22}H_{44}\) burns, 13.73 L of oxygen gas is used.

An ideal gas equation is:

The macroscopic characteristics of ideal gases are related to the ideal gas law (PV = nRT). Gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume).

First, determine the gas's moles using the gas law.

PV = nRT, where n is the number of moles and R is the gas constant. Next, divide.

To obtain molar mass, multiply the given mass by the number of moles.

Data provided:

P= 101kpa =0.996792 atm

V= ?

R= 0.082057338 L atm K\(^{1} mol^{-1}\)

T=25 +273 =298 K

Moles =?

Moles = mass/molar mass = 185g/308.6

Moles =0.56

Putting value in the given equation:

PV/RT =n

0.56 = \(\frac{0.996792 atm XV}{0.082057338 L atm K^{1} mol^{-1} X 298}\)

13.73 L =V

13.73 L of oxygen gas was used up if 185 g of \(C_{22}H_{44}\) wax burns.

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Explanation:

a) To calculate the relative molecular mass of Na2CO3.10H2O, you need to add up the relative atomic masses of each element in the formula.

Na₂CO3.10H₂O: 2(22.99) + 12.01 + 3(16.00) + 10(1.01) + 2(18.02) = 286.19 g/mol

M₁ = 286.19 g/mol

(b) To make a 250cm³ of 0.10 mol/dm³ solution, we need to calculate the number of moles of Na2CO3.10H2O, and then multiply it by the molar mass of Na2CO3.10H2O to find the mass needed.

First, we calculate the number of moles present in 250 cm³ of 0.10 mol/dm³ solution:

moles = concentration x volume = 0.10 mol/dm³ x 0.25 dm³ = 0.025 mol

Then we multiply the moles by the molar mass to find the mass needed:

mass = moles x molar mass = 0.025 mol x 286.19 g/mol = 7.15 g

So we need 7.15 g of Na2CO3.10H2O to make 250 cm³ of a 0.10 mol/dm³ solution.