Which concept accounts for the whole-number subscripts in chemical formulas?.

Answer:

Volume will the gas occupy at \(70\) kPa \(= 5.71\)

Explanation:

As per the gas law

\(P_1V_1 = P_2V_2\)

Here

\(P_1 =\) initial pressure of the gas

\(P_2\) = final pressure of the gas

\(V_1 =\) Initial volume of the gas

\(V_2\) =  the final volume of the gas

here,

\(P_1 = 80\) kPa

\(V_1 = 5\) mL

\(P_2 = 70\)

Substituting the given values in above equation, we get -

\(80 * 5 = 70 * V_2\\V_2 = 5.71\)

Volume will the gas occupy at \(70\) kPa \(= 5.71\)

Answer:

10

Explanation:

Khan Academy

Answer:

123.5 kPa

Explanation:

P2=P1T2/T1

You can check this by knowing that P and T at constant V have a proportional relationship. Hence, this is correct.

Answer: Number 1 is titanium.

The one where you calculate a tin block is 13.0cm.

3. Is A) Same Density And Same Chemical Properties.

4. Is also A. Ne

Explanation:

Answer:

2NaBr+Cl2=2NaCl+Br2

Explanation:

each side Na2 Br2 Cl2 atom

Answer:

[H⁺] = \(6.3096\)×\(10^{-4}\) M

Explanation:

pH= - log[H⁺]

=> 3.2 = - log[H⁺]

=> [H⁺] = \(10^{-3.2}\)

∴ [H⁺] = \(6.3096\)×\(10^{-4}\) M

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Carbon dioxide will bind with water to form carbonic acid (H₂CO₃), which is capable of dissociating into hydrogen ions (H⁺) and bicarbonate ions (HCO₃⁻). This process is reversible in the presence of high acidity or low carbon dioxide concentrations.

When CO₂ dissolves in water, it reacts with H₂O to create carbonic acid. This reaction can be represented as:
CO₂ + H₂O ⇌ H₂CO₃

Carbonic acid is a weak acid, meaning it partially dissociates in water. This dissociation produces hydrogen ions and bicarbonate ions:
H₂CO₃⇌ H⁺ + HCO₃⁻

The concentration of hydrogen ions determines the acidity of a solution. If acidity increases (more H⁺ ions), the equilibrium will shift towards the left, converting H₂CO₃ back into CO₂ and H₂O:
H₂CO₃ + H⁺ ⇌ CO₂ + 2H₂O

Similarly, when CO₂ concentrations decrease, the reaction will also shift to the left to restore equilibrium:
H₂CO₃⇌ CO₂ + H₂O

This reversible process plays a crucial role in maintaining pH balance in various natural systems and human body processes, such as blood buffering systems and ocean acidification.

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Answer:

nahhhhhhhhhhhhhhhhhhhhhhh xD

have a good day :)

Explanation:

WHY ONLY GIRLS? maybe find something better to do. so disgusting.

Explanations:

(i) Moles for K

mass = 89.3% = 89.3g

Mol. mass K =39.0983g/mol

∴ n = mass/molmass

=89.3/39.0988

=2.28 moles

(ii) Moles for N

mass = 10.7% = 10.7 g

Mol. mass N =14.0067g/mol

∴ n = mass/molmass

=10.7g/ 14.0067g/mol

=0.76 moles

• K= 2.28 /0.76 = 2.9898240669737 ≈ 3

• N=0.76/0.76 = 1

As you transitioned from a solid to liquid to gas, the speed of your particles increased, distance between them grew and their arrangement became more disordered.

If you were placed on a hot sidewalk, you would experience conduction as the heat transferred from surface to your body.

As a result, you would turn into liquid water, and particles in your structure would begin to move faster, increase distance between them, and become more disordered. This is because the added heat increases the energy in particles, causing them to break away from their frozen state and become more fluid.

If you were exposed to the sun or another heat source, you would experience radiation as energy in form of electromagnetic waves traveled through space and heated your body.

And as a result, you would turn into gas and particles in your structure would increase in speed, become more spaced apart, and become even more disordered. This is because additional energy from heat causes particles to move around more rapidly, leading to breakdown of any remaining structure.

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Answer:

A piece of gold foil was hit with alpha particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space. Some particles had their paths bent at large angles. A few even bounced backward. The only way this would happen was if the atom had a small, heavy region of positive charge inside it.

c) positively charged and relatively small.

Answer:

because you might have a too much bigger than explosion if you add more baking soda or vinegar

Explanation:

You use the same amount of baking soda and the same amount of liquid for each combination for the explosion.

We know that,

When you use the same amount of baking soda and the same amount of liquid for each combination then be get the explosion.

Baking soda and liquid are base and acid so they react chemically.

Here, the given liquid is vinegar

If you will increase the amount of baking soda and if you will increase the amount of liquid then no reaction

So, you use the same amount of baking soda and the same amount of liquid for each combination for the explosion.

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Answer:

A

Explanation:

The answer to this question is A. Both ripening and spoiling are chemical reactions.

Spoiling is a chemical reaction because spoiled food has bad smell and taste and it changes colour too.

Ripening of fruits is a chemical change. For example the colour could change as well as the texture.

Answer:

option a) chemical reaction, chemical reaction.

Explanation:

Changes in which new substances with different properties are formed are called chemical changes. Cooking of food, burning of substances are chemical changes as entirely new substances are formed. Burning of a candle wax releases carbon dioxide and water vapour (new substances). in here ripening and spoiling is a change that cannot be reversed which makes it a chemical change.

The researchers may use statistical analysis to estimate the half-life and evaluate the substance's pharmacokinetic properties, such as absorption, distribution, metabolism, and elimination.

The variable that the pharmaceutical company is studying in this experiment is a pharmacokinetic variable known as the "half-life" of the substance. The half-life represents the time it takes for the concentration or amount of a substance in the bloodstream to decrease by half.

In this case, the researchers are administering 100mg of the substance orally to the subject and then measuring the time it takes for half of the substance to be eliminated from the bloodstream. The half-life is a crucial parameter in pharmacokinetics as it provides information about the rate of elimination or clearance of the substance from the body.

The half-life variable is a quantitative variable because it represents a measurable quantity, specifically the time duration. It is a continuous variable as it can take any positive value on the time scale, depending on the specific substance being studied. The researchers may use statistical analysis to estimate the half-life and evaluate the substance's pharmacokinetic properties, such as absorption, distribution, metabolism, and elimination.

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Answer:

zero two is bae

Explanation:

CH. Option A is correct

Given the reaction for the complete combustion of pagodane expressed as:

In order to determine the empirical formula of the hydrocarbon, we must know the moles of carbon and hydrogen produced in the given reaction

Given the following parameter:

Moles of carbon = 0.0768 moles

Determine the moles of hydrogen produced

Determine the mass of carbon using moles * molar mass

Mass of Hygrogen = 1.0g - 0.9216g

Mass of Hydrogen = 0.0784grams

Determine the moles of hydrogen

Moles of hydrogen = 0.0784 /1 = 0.0784moles

Divide the moles by the least molar amount to normalize

Carbon = 0.0768/0.0768 = 1

Hydrogen = 0.0784/0.0768 = 1.021

Since the molar amount is in the ratio 1:1, hence the empirical formula of pagodane is CH

The concentrations of H2, Br2, and HBr are approximately 0.125 M, 0.125 M, and 0.250 M, respectively.

To solve this problem, we'll use the equilibrium constant expression and the given information to calculate the equilibrium concentrations of H2, Br2, and HBr.

The balanced equation for the reaction is:

H2 + Br2 ⇌ 2HBr

Given:

Initial moles of H2 = 0.500 mole

Initial moles of Br2 = 0.500 mole

Volume of the container = 2.00 L

Equilibrium constant (Kc) = 36.0

Let's assume that at equilibrium, the concentration of H2 is [H2], the concentration of Br2 is [Br2], and the concentration of HBr is [HBr]. We'll use the stoichiometric coefficients from the balanced equation to set up the equilibrium expression:

Kc = [HBr]^2 / ([H2] * [Br2])

Since we have the initial moles of H2 and Br2, we can calculate their initial concentrations:

Initial concentration of H2 = (0.500 mole) / (2.00 L) = 0.250 M

Initial concentration of Br2 = (0.500 mole) / (2.00 L) = 0.250 M

Let's assume the equilibrium concentrations of H2 and Br2 are x M, and the equilibrium concentration of HBr is 2x M.

Substituting the concentrations into the equilibrium expression and solving for x:

36.0 = (2x)^2 / (0.250 * 0.250)

36.0 = 4x^2 / 0.0625

144x^2 = 0.0625 * 36.0

144x^2 = 2.25

x^2 = 2.25 / 144

x^2 ≈ 0.015625

x ≈ 0.125

Since [H2] = x and [Br2] = x, the equilibrium concentrations are:

[H2] ≈ 0.125 M

[Br2] ≈ 0.125 M

[HBr] ≈ 2x ≈ 2 * 0.125 M ≈ 0.250 M

Therefore, at equilibrium, the concentrations of H2, Br2, and HBr are approximately 0.125 M, 0.125 M, and 0.250 M, respectively.

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From all the information given, we find that the theoretical yield of Na2CO3 is approximately 1.048 g.

To find the theoretical yield of Na2CO3, we start by converting the given mass of NaHCO3 to moles. The molar mass of NaHCO3 is 84.01 g/mol. Therefore, the number of moles of NaHCO3 can be calculated as:

moles of NaHCO3 = mass of NaHCO3 / molar mass of NaHCO3

moles of NaHCO3 = 1.662 g / 84.01 g/mol

By performing this calculation, we find that the number of moles of NaHCO3 is approximately 0.01978 mol.

Next, we use the stoichiometric ratio from the balanced equation to determine the moles of Na2CO3 produced. From the equation, we can see that 2 moles of NaHCO3 produce 1 mole of Na2CO3. Therefore:

moles of Na2CO3 = moles of NaHCO3 / stoichiometric ratio

moles of Na2CO3 = 0.01978 mol / 2

This gives us the number of moles of Na2CO3, which is approximately 0.00989 mol.

Finally, we convert the moles of Na2CO3 back to grams by multiplying by its molar mass:

mass of Na2CO3 = moles of Na2CO3 * molar mass of Na2CO3

mass of Na2CO3 = 0.00989 mol * 105.99 g/mol

By performing this calculation, we find that the theoretical yield of Na2CO3 is approximately 1.048 g.

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Answer:

B

Explanation:

The warmer the water, the more space it takes up, and the lower its density.

Answer:

The density decreases

Explanation:

The colder the water the closer the particles move together making it denser. The hotter the water the more the particles slow down and move away from each other making the water less dense.

Based on the results obtained, the sample with the shortest time taken for the color change to occur contains the largest number of carbon to carbon double bonds.

What is Saturated Fat?

Saturated fat is a type of fat in which all the carbon atoms in the fatty acid chains are bonded to hydrogen atoms, leaving no double bonds between the carbon atoms. This results in a straight and rigid molecular structure that allows the fat molecules to pack tightly together, leading to a solid or semi-solid consistency at room temperature. Saturated fats are commonly found in animal products, such as meat and dairy, as well as in some plant-based sources like coconut and palm oil. A diet high in saturated fats has been linked to an increased risk of heart disease and other health problems.

The sample with the largest number of carbon to carbon double bonds will react the fastest with the bromine water, resulting in the quickest color change from orange to colorless. Therefore, the sample with the shortest time taken for the color change to occur will contain the largest number of carbon to carbon double bonds.

Therefore, the sample that contains the most carbon to carbon double bonds can be determined by comparing the times taken for the color change to occur in each sample.

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Calcium carbonate (CaCo3) is a white solid and gaseous with the density of 2.71 g/cm^3 that can be easily calculated or observed without a chemical reaction, so it is simply a physical property.

Now the second sentence says that it reacts readily with an acid to produce gaseous carbon dioxide.

Let's take a chemical reaction:

CaCO3( Calcium Carbonate) + 2HCl (Hydrochloric Acid) ----> CaCl2 (Calcium Chloride) + CO2 (Carbon Dioxide) + H2O (Water)

Hence it readily reacts with acids so it is clearly a chemical change and falls into chemical property.

Physical properties denote or comprises density, color, melting and boiling point where as chemical properties comprises of it goes in a particular chemical reaction and changes.

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An ideal gas is a theoretical gas composed of many randomly moving point particles that are not subject to interparticle interactions.

The ideal gas concept is useful because it obeys the ideal gas law, a simplified equation of state, and is amenable to analysis under statistical mechanics. The requirement of zero interaction can often be relaxed .

For a gas to be “ideal” there are four governing assumptions:

1) The gas particles have negligible volume.

2) The gas particles are equally sized and do not have intermolecular forces (attraction or repulsion) with other gas particles.

3) The gas particles move randomly in agreement with Newton’s Laws of Motion.

4) The gas particles have perfect elastic collisions with no energy loss.

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Answer:

Explanation:

Insulin is an hormone used to regulate blood glucose, as it helps to maintain a balance. It allows for transport of glucose to organs such as liver.

The process of glucose regulation is a complex process. When food is eating glucose is absorbed into the bloodstream this happen from the gut and it raises the blood glucose level this causes insulin(hormone) to be released from the pancreas so glucose can move inside the cells and be used.

As glucose moves inside the cells, the glucose level inside the bloodstream returns to normal and insulin release slows down.

Glucose which is the main energy source used by cells is allowed to be taken up by muscles, liver and fat (adipose tissue) and use as a source of energy so they can function properly.

Answer:

With the addition of heat, liquid particles move faster, decreasing viscosity. However, the addition of heat to gas particles causes them to collide with each other more often, increasing the viscosity. ... Particles with larger size and shape collide more often, increasing internal friction.

Explanation:

hope this helps you !!

Fossils are great for providing evidence for an evolutionary change! Scientists can see how long life has existed on Earth by studying fossil records. Any living organism that is preserved, is considered a fossil, including plants! Fossils take 10,000 years to be formed, showing that, yes, fossil evidence supports that these cycles of evolution take quite a long time.

Hope this helps!

-Moiselle

Answer:

it is option A

Explanation: nitrification, is the process by which bacteria in the soil convert ammonia to nitrites and nitrates. Ammonia (NH3) was produced by nitrogen fixation, but plants prefer nitrites and nitrates as a source of nitrogen and oxygen.

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