In order for reflection to occur the waves must an object

The expected pH values of the buffer systems from the experiments are: A: 4.75 ; B: 4.25 ; C: 6.37 ;  D: 5.77.

To calculate the expected pH values of the buffer systems from the experiments (a, b, c, d) using the Henderson-Hasselbalch equation, pH= pKa + log([A⁻]/[HA]), we need to first determine the [A⁻]/[HA] ratio for each experiment.

For experiment A, we have:
[A⁻]/[HA] = [CH₃COO⁻]/[CH₃COOH] = (0.1 M)/(0.1 M) = 1
pH = pKa + log([A⁻]/[HA]) = 4.75 + log(1) = 4.75
The expected pH value for experiment A is 4.75.

For experiment B, we have:
[A⁻]/[HA] = [CH₃COO⁻]/[CH₃COOH] = (0.1 M)/(1.0 M) = 0.1
pH = pKa + log([A⁻]/[HA]) = 4.75 + log(0.1) = 4.25
The expected pH value for experiment B is 4.25.

For experiment C, we have:
[A⁻]/[HA] = [HCO₃⁻]/[H₂CO₃] = (0.1 M)/(0.1 M) = 1
pH = pKa + log([A⁻]/[HA]) = 6.37 + log(1) = 6.37
The expected pH value for experiment C is 6.37.

For experiment D, we have:
[A⁻]/[HA] = [HCO₃⁻]/[H₂CO₃] = (0.1 M)/(1.0 M) = 0.1
pH = pKa + log([A⁻]/[HA]) = 6.37 + log(0.1) = 5.77
The expected pH value for experiment D is 5.77.

In summary, the expected pH values of the buffer systems from the experiments are:
A: 4.75
B: 4.25
C: 6.37
D: 5.77

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Answer:

exothermic reaction

Explanation:

your welcome :)

The two statements that apply about boiling water on Venus are:

What impact does pressure have on boiling point?

Because the boiling point is the point at which the vapour pressure equals or exceeds the atmospheric pressure, the amount of energy needed to boil a liquid increases as pressure increases.

Explanation:

According to the definition given earlier, anything reaches its boiling point when its vapour pressure reaches or exceeds that of the atmosphere. More and more particles have the energy to transition into the gas phase as temperature rises. As a result, the liquid boils as the vapour pressure rises to equal or higher than atmospheric pressure.

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Question:

The planet Venus is surrounded by a thick layer of gases. In fact, the atmospheric pressure on Venus is over 90 times greater than the atmospheric pressure on Earth. Which statements are true about boiling water on Venus? Choose the two (2) statements that apply.

A. The temperature of water will remain constant while it boils.

B. Water will boil at a higher temperature on Venus than on Earth.

C. Water will boil at a lower temperature on Venus than on Earth.

D. The temperature of water will increase as it boils.

Answer:

I will try to solve these problems

Answer:

When an atom of hydrogen loses its electron it becomes positively charged.

Final Answer: +1

Explanation/Reasoning:

Because hydrogen is an atom (not an ion), you'll write it as H (not H+). Hydrogen (H) has one proton and one electron, so if it loses its electron, it will only have one proton. Therefore, it becomes an ion of H+. This means that the charge will be +1.

~I hope I helped you :)~

Answer:

165.3 cm^3

Explanation: hope this is correct!!

P1 * V1 / T1 = P2 * V2 / T2

P1 = 84.6 kPa

V1 = 215 cm³

T1 = 23.5°C = 23.5 + 273 K = 296.5 K

At STP:

P2 = 101.3 kPa

V2 = ?

T2 = 273 K

It is false that a substance's flashpoint is the temperature at which it will explode.

The flash point is actually the lowest temperature at which ignition occurs, there will be enough flammable vapours to induce ignition when an ignition source is applied.

Temperature is the degree of hotness and coldness of a body.

Ignition is the process of setting fire from a fuel source.

Flammable vapours are those which when mixed with air or oxygen in the right proportions are explosive.

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The following data were obtained from the question given above:

Charles' law states as follow:

V₁ / T₁ = V₂ / T₂

Inputting the given parameters, the final volume can be obtained as follow:

3 / 295 = V₂ / 333

Cross multiply

295 × V₂ = 3 × 333

295 × V₂ = 666

Divide both side by 295

V₂ = 666 / 295

V₂ = 2.26 L

Thus, the final volume on the balloon is 2.26 L

The current size of the balloon can be obtain as follow:

We can see that the final volume of the balloon is smaller than the initial size.

Thus, we can say that the size of the balloon reduced.

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compound z has a mw of 100 g/mol.  partner weighed 250 grams of compound z  dissolved it in water to a final volume 1 liter, concentration of the solution expressed as a percentage by weight  M = 2.5 mol /L.

M = n / V

M = 2.5 mol / 1 L

Concentration is the ratio of a constituent's abundance to the mixture's overall volume. Mass, molar, number, and volume concentrations are among the different categories of mathematical description, which refers to the act or process of concentrating. 3. anything that is focused. 4. the strength of a solution, specifically the quantity of dissolved material in a given volume of solvent, is often represented in moles per cubic metre or cubic decimetre (mL). a solution is a particular sort of homogeneous mixture made up of two or more substances. A solution is a homogenous mixture of two or more components in which the particle size is smaller than 1 nm. A solute is a material dissolved in a solvent in such a mixture.

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Answer:

Synthesis reaction~~~~~~~

Explanation:

Answer:

D

Explanation:

This question is a little strange. C and D are very similar, but I would pick D.

Fluorine actually has the highest electronegativity of all the elements. This allows it to pull more electrons towards itself. Since electrons have a negative charge, this causes the fluorine end of the molecule to be more negative while the hydrogen is left striped of electrons and has it positively charged necleus exposed. This means that one end of the molecule is positive while the other is negative, which makes this molecule polar. The only reason I would pick D over C is that D addresses the second part of the question about the covalent bond. A covalent bond is simply when two atoms share electrons.

Let me know if this was right and I hope it helps.

Answer:

omg

Explanation:

omg omg omg omg omg omg omg omg omg omg I can't either ehhhhhh

Given what we know about the energy of particles in each state, we can confirm that the best comparison between water and ice is that particles of liquid water have more energy than particles of ice.

Therefore, we can confirm that since the heat required to keep water in a liquid state excites the particles and gives them more energy, the correct comparison would be to say that particles of liquid water have more energy than particles of ice, option B is correct.

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Answer:

b.

Explanation:

Answer:

a

Explanation:

Answer:

dont know

Explanation:

A full valence shell's number of electrons less the amount of electrons involved in bonding equals the number of non-bonding electrons (which is 2 x the typical number of bonds). The amount of electrons not in bonds is equal to the number of lone pairs divided by two.

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3. (a) Ni electrode can serve as the standard electrode as its reduction potential is zero. It can act a reference standard electrode as the species with reduction potential values more positive to it will get reduced and species with reduction potential values more negative to it will get oxidized. Thus Ni electrode can serve as reference standard electrode.

(b) Cu2+ ion is most easily reduced as it has positive reduction value thus it act as good oxidizing agent by oxidizing other an itself get reduced.

(c) Al metal is most easily oxidized as it has most negative reduction potential value thus it act as good reducing agent by reducing others and itself get oxidized.

(d) Copper and aluminium electrodes are connected to battery to form a spontaneous cell

(i) Al is oxidized as it has negative reduction potential value, thus it loses 3 electrons and form Al3+ ion.

(ii) Al metal act as anode. Because at anode always oxidation takes place. So Al is oxidized to Al3+ at anode.

(iii) At anode: 2 Al (s) 1  2 Al3+ (aq) + 6e-

At cathode: 3 Cu2+ (aq) + 6e- 1  3 Cu (s)  

Net ionic equation: 2 Al (s) +  3 Cu2+ (aq) 1  2 Al3+ (aq) + 3 Cu (s) 

(iv) E0cell = E0cathode - E0anode 

E0cathode = E0Cu2+/ Cu  = 0.62 V                

E0anode = E0Al3+ / Al = -1.38 V

E0cell  = 0.62 V - (-1.38) V = 2 V

As the standard electrode potential of cell is positive, thus the cell reaction is spontanoeus and will proceed in forward direction.

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If you leave a sink dripping on the same spot on a bar of soap for 45 minutes, about 54 grams of soap will be eroded and the soap will weigh about 81 grams.

Answer:

summer

The North Pole stays in full sunlight all day long throughout the entire summer (unless there are clouds)

Answer:

summer

Explanation:

hope this helps :)

The phenomenon observed, where water at the top of the mountain started boiling before the water at lower stations, can be attributed to the difference in atmospheric pressure at various elevations.

Atmospheric pressure decreases with increasing altitude. The pressure exerted by the atmosphere affects the boiling point of a liquid. As the pressure decreases, the boiling point of a substance also decreases.

This is because boiling occurs when the vapor pressure of the liquid equals the atmospheric pressure. When the atmospheric pressure decreases, the vapor pressure required for boiling is reached at a lower temperature.

On top of the mountain, where the atmospheric pressure is lower, the boiling point of water is lower compared to the stations at lower elevations.

Therefore, even if the water at each station was at the same initial temperature, the water at the top of the mountain reached its boiling point first because the lower atmospheric pressure allowed the vapor pressure to be achieved at a lower temperature.

In contrast, the stations located at lower elevations experience higher atmospheric pressure, requiring a higher temperature to reach the boiling point of water. Hence, the water at these stations takes longer to reach the boiling point compared to the water at the top of the mountain.

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Increased temperature may result from a loss of sodium .

Sodium is a macronutrient . it is considered as beneficial element .

Sodium occurs naturally in most of the foods .the common form of sodium is sodium chloride which is known as table salt ,almost available in every foods . We take it regularly .milk , beets and celery are source of sodium ,they naturally contain sodium .

some of the form of sodium are monosodium glutamate , baking soda and sodium benzoate . processed meats like sausage , ham canned soups and vegetables also contains sodium .even fast food is the high source of sodium .

The sodium content in the body decreases if we take too much amount of water . because we loss sodium through sweat . drinking too much water cause overwhelming the kidney's ability to excrete water .

the symptoms include dizziness , fatigue , lethargy , thirst , headache , insufficient urine production , nausea . hyponatremia is the most common electrolyte disorder .

The human body requires small amount of sodium per day to conduct nerve impulse , relax muscles , maintain proper balance of water and minerals . body uses sodium to control blood pressure and volume .

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The difference in boiling points between cis-but-2-ene and trans-but-2-ene is due to the presence of different intermolecular interactions.

In cis-but-2-ene, the molecules have a dipole-dipole interaction, which is stronger as compared to the intermolecular force in trans-but-2-ene and this stronger interaction requires more energy to break, resulting in a higher boiling point of cis-but-2-ene (3.7 °C) as compared to trans-but-2-ene (0.9 °C).

Boiling point is that temperature at which any substance changes from liquid to gaseous phase at specific pressure. It is an important physical property of the substance and that is influenced by factors, like intermolecular forces, molecular size and molecular shape.

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Answer:

more genetic variation within a population usually enables more phenotypic variation.

Explanation:

Because natural selection acts directly only on phenotypes,  Some new alleles increase an organism's ability to survive and reproduce, which then ensures the survival of the allele in the population.

Genetic variation lets the organisms survive long term as it increases the phenotypic and the genotypic variation.  Genetic variation is due to the type of reproduction that involves two parents.

Genetic variation is the modification of the original genome of the organism by genetic recombination and mutation that can be beneficial in the survival and the natural selection process.

Reproduction involving two parents of the same species allow genetic variation as the process of independent assortment and crossing over of the chromosomes inherited from both creates species with different traits and genotype.

Therefore, the reproduction involving two parents results in genetic variation.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

YES!

Explanation:

Answer:

bro noone going to sit down and read all this

Explanation:

A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.

A lunar eclipse occurs when the Sun, Earth, and Moon align in the same line in which the Moon passes into Earth's shadow. In a total lunar eclipse, the entire Moon falls within the darkest part of Earth's shadow, called the umbra so we can conclude that claim 2  is the right answer about lunar eclipse.

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burninh fossil fuels is not an example

Answer:

Gravity

Explanation:

Gravity is not a form of mechanical energy used in power plants