Which of the following phases occur at point B on the phase diagram shown below

A. Boiling
B. condensation
C. freezing
D. sublimation

if the person who answers would kindly give an explanation so I can understand how to do this in the future, that would be great :) thank you!

Answer:

They dissolved into the water, forming a mixture.

Explanation:

The salt is sodium chloride (NaCl) and the sugar is a dissacharide which contains many hydroxyl  groups (-OH). Both of them are very soluble in water, but they will not start a chemical reaction between themselves.

Dissolving them in water will form a mixture of chloride ions (Cl⁻), sodium ions (Na⁻) and sugar molecules.

Answer:

C6H1206 + 6O2  > 6CO2  + 6 H2O

Explanation:

On the left side we have  6xC so we multiply CO2 by 6 to get the same amount of C.

We have 12x H on the left side, so we multiply H2O on the right side by 6 to get the same amount of H.

On the right side we have 18x O ( 6CO2 gives us 6x2x O which is 12O; and 6H2O gives us 6O.  To get the same amount on the left side ( we already have 6O in C6H12O6), so we only need 12 O more. So we multiply O2 on the left side by 6. Which gives us 18x O on both sides.

So on both sides we have now:

6x C

12xH

18xO

Answer:

The two reactants for photosynthesis are carbon dioxide (CO₂) and water (H₂O).

Explanation:

The equation for photosynthesis is as following:

6CO₂ + 6H₂O => C₆H₁₂O₆ + 6O₂

The reactants of a chemical reaction are the chemicals before the arrow, before the reaction takes place. In the equation above the reactants are carbon dioxide (CO₂) and water (H₂O).

Final answer:

Photosynthesis occurs in two stages: light-dependent reactions and the Calvin cycle. The light-dependent reactions convert sunlight into chemical energy and release oxygen. The Calvin cycle uses this energy to capture carbon and assemble sugar molecules.

Explanation:

Photosynthesis takes place in two stages: the light-dependent reactions and the Calvin cycle. In the light-dependent reactions, chlorophyll absorbs energy from sunlight and converts it into chemical energy with the aid of water. The light-dependent reactions release oxygen as a byproduct from the splitting of water. In the Calvin cycle, the chemical energy derived from the light-dependent reactions drives both the capture of carbon in carbon dioxide molecules and the subsequent assembly of sugar molecules.

Answer:the man speaks the truth

Explanation:

Alkaline earth metals are in group 2 of the periodic table, forming alkaline solutions when their oxides react with water. They have higher ionization energies and smaller atoms than alkali metals, which makes them less reactive. In chemical reactions, they lose their valence electrons and exhibit a 2+ oxidation state.

The alkaline earth metals, which include beryllium, magnesium, calcium, strontium, barium, and radium, are part of group 2 of the periodic table. Characteristically, these metals form alkaline solutions when their oxides react with water. Additionally, these alkaline earth metals possess smaller atoms and have higher first ionization energies than the alkali metals existing within the same period. This contributes to their lower reactivity in comparison to alkali metals, though they are still highly reactive on their own.

A defining trait of these metals is that they readily lose both their valence electrons in chemical reactions, which leads them to exhibit an oxidation state of 2+. Furthermore, they have a completed s subshell in their outermost shell. The reactivity of these metals escalates with an increase in their size and a decrease in ionization energy.

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Answer:

The cost would be $1.68

Explanation:

I found the answer by multiplying

.67x or .67lb with 2.5, getting $1.68

Answer: $3.693

Explanation:

Since an apple costs $0.67 per lb

To get the price for 2.5kg, we need to first convert kg to lb

Since 1kg = 2.205lb

2.5kg = (2.205×2.5)lb

2.5kg = 5.513lb

Since $0.67 = 1lb

$x = 5.513lb

Cross multiplying we have;

x × 1 = 0.67×5.513

x = $3.693

Answer:

Explanation:

Colloidal:

Suspension:

This is the complete question with grammar corrections:

A glass vessel calibrated to contain 9.76 mL at 4° C was found to weigh 22.624 g when empty and dry. Filled with a soduim chloride (NaCl) solution at the same temperature , it was found to weigh 32.770 g. Calculate the solution's density.

Answer:

Explanation:

Density is the physical property that expresses the amount of matter (mass) per voumetric unit of solution:

In this problem, you can first calculate the mass, by difference. After that, you just have to divide the mass by the volume of the glass vessel (9.76 ml as per the calibration).

This is the two steps procedure.

1. Mass of the solution:

       Mass of solution = 32.770 g - 22.624 g = 10.146 g

2. Solution's density:

The density is rounded to 3 significant digits because the volume, which is dividing the mass, was reported with 3 significant digits.

Answer:

The solution density will be 1.04 g/mL

Explanation:

Mass of the solution = mass of the glass vessel with NaCl solution – mass of the empty glass vessel

= 32.770 g - 22.624 g

= 10.146 g

Volume of the solution = 9.76 mL

[tex]density = \frac {mass}{volume} \\\\= \frac {10.146g}{9.76mL}\\\\=1.04 \frac {g}{mL}[/tex]

Thus, the solution density will be 1.04 g/mL.

Answer:

Find the mass of a container.

Add 250 to the quantity and move the brokers to that value.

Add the sugar to the dough container until it reaches zero in the balance.

And ready, you will have the 250 g of sugar.

Explanation:

The triple beam balance is an instrument used to measure the mass quite accurately. This device has an approximate reading error of +/- 0.05 grams. The name refers to the three beams, the largest central beam, the front beam, medium size, and the furthest beam, smallest size. The triple beam balance can be used to measure the mass from objects, find the mass by the difference in the case of a liquid, and measure a substance.

To use a triple beam balance and get 250 grams of sugar, follow the  steps explained below

To use a triple beam balance and get 250 grams of sugar when baking, do these steps:

To start using the triple beam balance, put it on a table or desk that is sturdy and level. Make sure the balance is set up and positioned correctly.

Make sure all three beams are at zero by adjusting the riders or knobs until they line up with the zero marks.

Put a empty container on the weighing scale. If needed, change the zero marks again to include the weight of the container.

Put sugar in the container: Gently add sugar to the measuring container until the balance pointer moves slightly below the zero mark. This means that the sugar is heavier than the counterweight.

Balance the scales: Begin by focusing on the biggest beam (the one with the largest weight that can slide). Shift the heaviness along the long object towards the starting point until the arrow is flat. Do this again for the next two beams. Start with the second biggest beam, and then do the smallest beam.

Adjust the balance carefully: When the pointer is near the zero mark, use the smaller numbers on each side to change the weights until the pointer is perfectly aligned with the zero mark.

Take a look at the measurement: Combine the numbers on each side to find out the total weight of the sugar in grams. The total of the numbers on the beams equals the amount of sugar in the container.

Change the amount of sugar: If you have too much sugar (more than 250 g), take some of it out with a spatula or scoop until you have the right amount. If the weight is less than 250 g, add more sugar until you reach the desired amount.

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Answer:

250 mg

Explanation:

1 g = 1000 mg

0.25 x 1000 = 250

0.25 grams is equivalent to 250 milligrams. This conversion is done by multiplying the amount in grams by 1000, which is the conversion factor for grams to milligrams.

The student is asking how to convert grams (g) to other units of mass. In this case, 0.25 grams is equivalent to 250 milligrams (mg). One gram is equivalent to 1000 milligrams, so we can convert the 0.25 grams into milligrams by multiplying by 1000.

To carry out the calculation :

Thus, 0.25 grams (g) is equivalent to 250 milligrams (mg), and so the correct answer is 250 mg. The options stating 0.025 kg and 0.025 mg are incorrect since they portray conversion factors inaccurately. The same applies for the 250 kg option, it is far beyond the original value.

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All cells share common features such as a plasma membrane, cytoplasm, DNA, and ribosomes. However, prokaryotic and eukaryotic cells have some differences.

All cells share four common components: 1) a plasma membrane, an outer covering that separates the cell's interior from its surrounding environment; 2) cytoplasm, consisting of a jelly-like cytosol within the cell in which other cellular components are found; 3) DNA, the genetic material of the cell; and 4) ribosomes, which synthesize proteins. However, prokaryotes differ from eukaryotic cells in several ways.

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Yes, all cells share some common features.

Even though there is a great diversity in cell types, shapes, and functions, every cell has the following basic structures in common:

Plasma Membrane: This is the outer covering of the cell, which separates the cell's interior from its surrounding environment. It controls the movement of substances in and out of the cell.

Cytoplasm: This is the gel-like substance inside the plasma membrane. It contains all the cell's organelles and is the site where most cellular activities occur.

DNA: All cells have DNA as their genetic material. DNA carries the instructions needed for the cell to grow, reproduce, and function.

Ribosomes: These are the particles that synthesize proteins, which are essential for the cell's structure and the functions it performs.

These shared features suggest a common ancestry among all living organisms. Despite their variety, these fundamental characteristics are crucial for the essential processes that all cells must perform, such as transportation of materials, obtaining and using energy, waste disposal, replication, and responding to their environment.

Answer:

Physical Change

Explanation:

The ice isn't changing what it is, because its still water (even though its in a different form) If you freeze it again it will be exactly the same and so its a Physical Change

Answer:

Melting ice will change to water and windshield will change to very vescus fluid.

Explanation:

Answer:

1.6 × 10²³ molecules of N2O5

Explanation:

To find the amount of molecules from the amount of moles of a substance we simply multiply the amount of moles by Avagadro's number.

0.27mol × 6.02×10²³ = 1.6 × 10²³ molecules of N2O5

Answer:

True it can be misinterpreted.

Explanation:

Answer:

Explanation:

The normal boiling point of water is 100°C. That is the temperature at which water boils when the atmospheric pressure is 1 atm, i.e. at sea level.

The liquids boil when its vapor pressure equals the atmospheric pressure; so the higher the atmospheric pressure the higher the boiling point, and the lower the atmospheric pressure the lower the boiling point.

Since, it is stated that the altitude of Denver, Colorado is 1,600 m, the atmosperic pressure (ther pressure exerted by the columnn of air above the place) is lower than 1 atm (atmospheric pressure at sea level).

Hence, water boiling point in Denver is lower than 100°C.

The graphs shown represent the temperature (T °C) as water is heated. Since when liquids boil their temperature remains constant during all the phase change, the flat portion of the graph represents the time during which the substance is boiling.

In the graph A, the flat portion is below 100°C; in the graph B, the flat portion is at 100 °C; in the graph C the flat part is above 100ªC, and, in graph D, there is not flat part. Then, the only graph that can illustrate water boiling in Denver, Colorado is the graph A.

Answer:24.14g Cl

Explanation:

Convert to moles

4.1 x 10^23 atoms Cl x (1 mol/6.022 x 10^23 stoms) = 0.68 moles

Convert from moles to grams using the molar mass by periodic table

0.68moles(35.45g/1 mol) = 24.14g Cl

To determine the mass of 4.1 x 10²³ atoms of Cl, we calculate the number of moles using Avogadro's number and then convert to grams using the molar mass of chlorine. The mass is 24.14 grams.

To determine the mass of 4.1 x 10²³ atoms of chlorine (Cl), we need to use Avogadro's number and the molar mass of chlorine.

First, we find out how many moles of Cl atoms are present by using Avogadro's number (6.022 x 10²³ atoms/mol):

Next, we use the molar mass of chlorine, which is 35.45 grams per mole, to convert moles to grams:

Therefore, the mass of 4.1 x 10²³ atoms of Cl is 24.14 grams.

Answer:

(1.45/237) x 6.02x10^23=  0.0368x10^23=3.68x10^21

Explanation:

Final answer:

To find the number of representative particles in 1.45g of a compound with a molar mass of 237g, calculate the moles and multiply by Avogadro's number, resulting in approximately 3.6859 x 10²¹particles.

Explanation:

To calculate the number of representative particles in 1.45g of a molecular compound with a molar mass of 237g, we will first determine the number of moles of the compound using the given mass and then multiply it by Avogadro's number.

Calculate moles: Number of moles = mass (g) / molar mass (g/mol) = 1.45g / 237g/mol.

Multiply by Avogadro's number to find the number of particles: Number of particles = Number of moles x Avogadro's number (6.02 x10²³ particles/mol).

Number of moles = 1.45g / 237g/mol = 0.0061224 mol.

Number of particles = 0.0061224 mol x6.02 x 10²³ particles/mol = 3.6859 x10²¹ particles.

Answer:

C

Explanation:

This is the only option that could produce an objective answer through experimentation or studies. The other options can be answered subjectively and are opinion based. They could not be answered scientifically.

The question about how switching from butter to canola oil affects cholesterol levels can be answered scientifically because it involves testable hypotheses and objective data collection.

Among the options provided, the question that can be answered scientifically is

C. how does switching from butter to canola oil affect cholesterol levels in the blood? This is because it poses a question that can be investigated using the scientific method, including forming a hypothesis, conducting experiments, collecting data, and drawing conclusions based on the evidence collected.

Scientific questions often involve understanding natural phenomena, observable events, and the relationships between variables. In comparison, the other questions listed involve personal opinions, morals, or subjective judgments, which are not scientifically testable and depend more on individual or cultural perspectives.

Answer and explanation:

1. To increases the accuracy of the measurement, the person should try to make sure the ruler is parallel to the object they are measuring. If they measure the object with the ruler not being parallel the measurement will end up larger then expected. To increase the precision the person must measure with the ruler in the same position each time.

2. A situation in which a set of measurements are precise but not accurate could be if a student measured an object at an incorrect angle many times, like the inaccurate measuring in the image above. All of the measurements would be inaccurate, but since they were all measured inaccuratly the same way, they will be precise.

3. An objects mass is defined as being the amount of matter in said object. An objects weight is defined as being the force exerted on an object by gravity. Although the man would weigh less on the Moon because there is less gravity, he still would not fit in his clothes because his mass has not changed.

Answer:

Pascal is the most common unit for measuring pressure

The average sea level pressure is 1013 mbar

Answer:

Hey! Pascal is the most common unit for measuring pressure. :)\

Explanation:

Answer:

The reactivity of an element From left to right.

Explanation:

The most reactive are on the right while the least reactive elements towards the left.

He observed that the physical and chemical properties of elements were related to their atomic mass in a repeating or in a periodic manner.

Dmitri Ivanovich Mendeléev was a Russian chemist and perhaps the most important person who contributed to the early development of the periodic table. Many periodic tables were made before him but the most important one till then was the Mendeleev periodic table.

After the rejection of Newlands Octave Law, in 1869, Mendeleev's Periodic table came was bought into the picture. In Mendeleev’s periodic table, elements were arranged according to the fundamental property of their atomic mass, and chemical properties.

During Mendeleev’s work, there were only 63 elements that were known. After he finished studying the properties of every element, Mendeleev found that the properties of elements were related to atomic mass in a repeating or periodic manner. That is why he arranged the elements in a manner where the elements that had similar properties were in the same vertical columns of the periodic table.

Therefore, he observed that the physical and chemical properties of elements were relating to their atomic mass in a repeating or in a periodic manner.

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Final answer:

The probability of getting exactly 2 tails when flipping a fair coin 7 times is approximately 16.41%, calculated using the binomial probability formula.

Explanation:

The probability of getting exactly 2 tails when you flip a fair coin 7 times can be calculated using the binomial probability formula, which is given by:

P(X=k) = (n choose k) × (pk) × ((1-p)(n-k))

where:

n is the number of trials (in this case, 7 flips),

k is the number of successful events (in this case, 2 tails),

p is the probability of success on a single trial (for a fair coin, this is 0.5 for getting a tail).

Using the formula, we calculate:

P(X=2) = (7 choose 2) × (0.5²) × ((1-0.5)⁷⁻²)

P(X=2) = 21 × (0.25) × (0.03125)

P(X=2) = 0.1640625

Therefore, the probability of getting exactly 2 tails when flipping a fair coin 7 times is approximately 16.41%.

Answer:

The energy emitted by sodium atoms is 33.38 j.

Explanation:

Given data:

Wavelength of photon = 589 nm   or  5.89 × 10⁻⁷m

Mass of excited sodium atoms = 3.78 mg

Energy emitted by 3.78 mg sodium atoms = ?

Solution:

First of all we we will calculate the energy of photon at given wavelength.

E = h.c/ λ

h = planck's constant =  6.626 × 10⁻³⁴  J.s

c = 3 × 10⁸ m/s

E = ( 6.626 × 10⁻³⁴  J.s × 3 × 10⁸ m/s ) / 5.89 × 10⁻⁷m

E = 19.878 × 10⁻²⁶  J.m / 5.89 × 10⁻⁷m

E =  3.375 × 10⁻¹⁹ J

Now we will calculate the number of atoms in 3.78 mg of sodium.

Mass of excited sodium = 0.00378 g  or 3.78 × 10⁻³ g

Molar mass of sodium = 23 g/mol

We know that   23 g of sodium = one mole = 6.02 × 10²³ atoms

(3.78 × 10⁻³ g / 23 g ) × 6.02 × 10²³ atoms = 0.989 × 10²⁰ atoms

The number of atoms are 0.989 × 10²⁰ atoms.

E =   0.989 × 10²⁰ × 3.375 × 10⁻¹⁹ J = 33.38 j

To calculate the energy emitted by 3.78 mg of sodium atoms, one must find the number of photons and the energy per photon, given the wavelength of 589 nm. The steps involve calculating the number of moles, multiplying by Avogadro's number, and using the energy formula for a photon (E = hc/λ).

The question asks how much energy is emitted by 3.78 mg of excited sodium atoms emitting light at a wavelength of 589 nm. To find this out, we need to calculate the number of photons that can be emitted by the given mass and then calculate the energy of each photon.

First, we'll find out the number of moles of sodium in 3.78 mg:

Number of moles = Mass (g) / Molar mass of sodium (Na) = 3.78 x 10-3 g / 22.99 g/mol

Then, we will multiply the number of moles by Avogadro's number to get the number of sodium atoms.

Now, the energy (E) of a single photon is given by E = hc/λ, where h is Planck's constant (6.626 x 10-34 J*s), c is the speed of light (3.00 x 108 m/s), and λ is the wavelength of light. Substituting the given wavelength value of 589 x 10-9m and solving the equation provides the energy of a single photon.

Finally, by multiplying the energy of one photon by the total number of sodium atoms, we can estimate the total energy emitted.

Answer:physical: a part falling off or changing a tire. chemical:rust

Explanation:

The chemical changes that occur as a car ages are fading of paint due to sunlight. rusting on the chrome, corrosion of electrical wiring. Some physical changes that occur as a car ages are breaking of the handles and straps, wearing down of tyre, paint  scratches.

A chemical change is one which brings change in the composition of the substance. In other words, it is such a change which forms a completely new substance or product. It is an irreversible change.

On the other hand, a physical change is one which brings structural change or change in appearance of a substance without changing its original composition. It is a reversible change.

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Van der Waals forces are the strongest force between N2 molecules, and hydrogen bonding is the strongest between NH3 molecules in the solid phase. Option D is correct.

A. This statement is incorrect because N2 molecules are nonpolar and do not exhibit dipole-dipole forces. NH3 molecules are polar and can have dipole-dipole interactions, but this is not the strongest force between them.

B. This option suggests that Van der Waals forces are the strongest between both N2 and NH3 molecules. Van der Waals forces include London dispersion forces, which are the primary intermolecular forces for nonpolar molecules like N2, and dipole-dipole interactions, which NH3 molecules can have due to their polarity. However, hydrogen bonding, which is stronger than dipole-dipole interactions, can occur in NH3.

C. This statement is not accurate because N2 molecules do not have dipole-dipole forces.

D. This option correctly states that Van der Waals forces are the primary forces between N2 molecules (nonpolar), and hydrogen bonding is the strongest force between NH3 molecules due to the presence of hydrogen atoms bonded to highly electronegative nitrogen atoms.

Option D is correct.

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Answer:

Atomic number

Explanation:

The number of protons in an atom determines its atomic number, which is unique to each element and also indicates the number of electrons in a neutral atom.

The number of protons in one atom of an element determines the atom's atomic number, and the number of electrons determines the chemical properties of an element. Atoms of each element contain a characteristic number of protons, and this number is unique to that element. For example, any atom containing one proton is hydrogen and has the atomic number 1. The atomic number not only distinguishes one element from another but also signifies the number of electrons in a neutral atom, since the number of protons equals the number of electrons. Therefore, the atomic number of an element defines both its identity and the number of electrons in its neutral state. Scientists use the atomic number to identify and categorize elements, with known elements' atomic numbers ranging from 1 (hydrogen) to 118 (Oganesson).

Answer:

Water and acetone is best by separated through distillation

The correct answer would be option C Acetone and water.

Explanation:

When in a mixture of fluid solution, two liquids are mixed in a form of mixture then these liquid can be separated only one method which is based on the fact. That two different liquids will have two different boiling temperatures which method of separating the Fluids is distillation.  

The different liquids that are  present in mixture are boiled and the vapours are condensed and the condensed portion is  accumulated in another beaker.

Answer:

The liquid must be water.

Explanation:

The liquid must be water because its density (mass/volume) is                    1 grams/cm³

Answer:

B. The theory might be modified if necessary.

B. nearly all scientists agree that it is correct

Explanation:

B. The theory might be modified if necessary.

The Bernoulli's principle relates the speed of fluid to their pressures. It simply states that when the speed of fluids increases there is a drop in pressure.

Supposing we find new evidence about how the principle works, the normal scientific thing to do is to modify the existing principle. New information and observations about a principle would only provide a modification to the existing one. An example is the Dalton's atomic theory, which was centered on the atom being the smallest indivisible particle: the theory was later modified when new ideas about the atom surface.

B. nearly all scientists agree that it is correct

Before a hypothesis is adopted to the context of scientific principle, the ideas behind it must have tested and must be repeatable. Different sources will verify the authenticity of such scientific claim to see if such can be adopted. Therefroe, nearly a large numbr of scientists must agree that it is correct.