A solution is made by dissolving 19.5 grams of glucose (C6H12O6) in 0.245 kilograms of water. If the molal freezing point constant for water (Kf) is -1.86 °C/m, what is the resulting Δtf of the solution? Show all he steps taken to solve this problem.

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Answer:

       when the pressure is decreased, the temperature of both containers will increase (option D).

Explanation:

Since this question has only one answer, you must assume that both containers are identical, i.e. have the same volume.

Using the ideal gas equation pV = nRT you can conclude that pressure and temperature are directly related, i.e. if the pressure is decreased, the temperature will decrease proportionally, which is opposite to the assumption that when the pressure is decreased, the temperature of both containers will increase.

On the other hand, from the same equation, you can tell the relationship between the other variables and conclude that the other choices are valid assumptions:

A. when the temperature is increased, the volume of both containers will increase:

Correct: pV = nRT shows that volume and temperature are directly related: when T increase, V increase)

B. when the pressure is increased, the volume of both containers will decrease

Correct: pV = nRT shows that p and V and inversely related, so when p is incrased, V will decrease.

C. both containers contain the same number of gas particles

Correct, only if the two containers are identical: since the two containers of the two different gases are at the same temperature and pressure, the equation pV = nRT, shows that if the volumes are equal the number of particles are the same.

David cannot assume option C, which states both containers contain the same number of gas particles since he only knows the temperature and pressure of both gases. Without knowledge of the volume, he cannot determine the number of particles via the Ideal Gas Law.

In this question, David does not have enough information to assume that C. both containers contain the same number of gas particles. This is because simply having the same temperature and pressure for two different gases does not confirm they have the same number of particles.

In the units of Ideal Gas Law, which states PV = nRT, 'P' stands for pressure, 'V' is volume, 'n' indicates number of moles i.e., the number of particles, 'R' is the universal gas constant, and 'T' is Temperature.

From this, we can see that the number of gas particles is proportional to the pressure and volume, and inversely proportional to the temperature. Therefore, without information about volume, we can not determine if both containers have the same number of particles.

The other possibilities regarding pressure, temperature, and volume changes are governed by the principles of gas laws, such as Boyle's, Charles', and Gay-Lussac's laws.

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Answer:

Explanation:

Pressure is defined as force per unit area that a fluid exerts on its surroundings. Pressure, P, is a function of force, F, and area, A: P = F/A. The SI unit for pressure is the pascal (N/m2), but other common units of pressure include pounds per square inch (psi), atmospheres (atm), bars, inches of mercury

Pressure is measured by a device called a barometer and pressure gauge. Pressure measures the force exerted on the area of something.

Pressure is a force that is exerted on an area of the object or subject and is measured in a bar, pascal, psi, etc. It can be said that it measures the force applied by any gas or liquid on the surface area of the object.

It is important in fluid mechanics, animal anatomy and plant anatomy as the pressure is the driving force of the liquid and the gaseous component in the body system that is very essential for survival.

Therefore, pressure measures force per unit area.

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Answer:

C. In every area of work.

Explanation:

(Apex)

In every area of work, chemicals are found. Hence, option C is correct.

A chemical is any substance that has a defined composition.

In every area of work, chemicals are found.

Some commonly used workplace chemical hazards include:

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Answer:

Plasma

Explanation:

Beryllium (Be) is similar to calcium (Ca) because both are somewhat reactive metals at standard temperature and pressure. Hence, option C is correct.

The alkaline earth metals are six chemical elements in group 2 of the periodic table.

They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

The second column on the periodic table of the chemical elements is collectively called the alkaline earth metal group: beryllium, magnesium, calcium, strontium, barium, and radium.

Because the outer electron structure in all of these elements is similar, they all have somewhat similar chemical and physical properties.

Beryllium (Be) is similar to calcium (Ca) because both are somewhat reactive metals at standard temperature and pressure.

Hence, option C is correct.

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Answer

Actually it is C

Explanation:

Thanks comment in the prevoius answer. Im doing study island now

Answer:

The average atomic mass is 24.30 amu.

Explanation:

When there are at least 2 isotopes for an atom, each with its own atomic mass, we can calculate an average atomic mass (AAM), which considers the mass of each isotope and its relative abundance. The mathematical expression is:

[tex]AAM=\frac{\Sigma m_{i} \times ab_{i}  }{\%100}[/tex]

where,

AAM is the average atomic mass

mi is the mass of each isotope

abi is the relative abundance of each isotope

If we replace this expression with the data we have, then:

[tex]AAM=\frac{23.9850amu \times 78.99 \% + 24.9858amu \times 10.00\% + 25.9826amu \times 11.01 \%}{100\%} =24.30amu[/tex]

Answer:

more, negative

Explanation:

It will become more stable by combining the negative electrons.

The atom fluorine generally will become highly stable through the formation of an ionic chemical compound by accepting one electron from another atom. This process will fill its outer energy level of electrons.

Atomic number of fluorine is 9. The electronic configuration of fluorine is 2,7. Fluorine has 7 electrons in the valence shell, so it requires one electron to attain the noble gas configuration, which is highly stable.  

Thus, we can conclude that through the formation of ionic chemical bonds fluorine become highly stable, by accepting one electron from another atom.  

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Answer:

1 gram I think it is right

Answer:

1 mole of gas = 22.4L

2.5 moles of gas takes up = ( 22.4 L/ 1 mole ) x 2.5 mole

= 56 L

Explanation:

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The volume of 2.5 moles of nitrogen gas (N2) at standard temperature and pressure (STP) is 56 liters.

The question asks about the volume of 2.5 moles of nitrogen gas (N2) at standard temperature and pressure, commonly referred to as STP.

At STP, one mole of any gas occupies 22.4 liters. This is known as molar volume. Therefore, we can calculate the volume that the specified moles of nitrogen gas would occupy by multiplying the quantity in moles by the molar volume.

Consequently, the volume of 2.5 moles of nitrogen gas at STP would be: 2.5 moles * 22.4 L/mole = 56 L

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Answer:

kintic

Explanation:

Answer:

The system's potential energy is increasing.

Hope this helps and I hope you have a wonderful day!!! :-)

Answer:

An alloy is a mixture of two or more metals

Explanation:

Answer:

The first law means that unless a force pushes or pulls the object will stay completely motionless. The second law says that acceleration depends on the amount of force exerted on an object and the objects mass. The third law means that if a force of 50 Newtons to the left occurs, a force of 50 Newtons to the right will also occur.

Explanation:

Answer:

Explanation:

Ist law: A body will continue in its present state of rest or if it is in motion, will continue to move with uniform speed on a straight line unless it acted upon by a force

2nd law: The rate of change of momentum of a body is directly proptional to the applied force and takes place in the direction of the force. F = ma

3rd law: To every action, there's an equal and opposite reaction.

Answer:

40.0%.

Explanation:

∴ The percent by mass of carbon in glucose = [(The atomic mass of C in glucose)/(The molar mass of glucose)] x 100 = [(72.0 g/mol)/(180 g/mol)] x 100 = 40.0%.

Answer:

40% (a)

Explanation:

Option A- 40%, got it right on edge 2020

c=λν

3*10^8 m/s * 10^9 nm/m / 7.26*10^14 s^-1= λ

=413.22 nm

λ=413 nm

Answer : The wavelength of violet light is, 413 nm

Explanation :

Formula used :

[tex]\nu=\frac{c}{\lambda}[/tex]

where,

[tex]\nu[/tex] = frequency of violet light = [tex]7.26\times 10^{14}Hz=7.26\times 10^{14}s^{-1}[/tex]

As we know that, [tex]Hz=s^{-1}[/tex]

[tex]\lambda[/tex] = wavelength of violet light

c = speed of light = [tex]3.00\times 10^8m/s[/tex]

Now put all the given values in the above formula, we get:

[tex]7.26\times 10^{14}s^{-1}=\frac{3.00\times 10^8m/s}{\lambda}[/tex]

[tex]\lambda=\frac{3.00\times 10^8m/s}{7.26\times 10^{14}s^{-1}}[/tex]

[tex]\lambda=4.13\times 10^{-7}m=4.13\times 10^{-7}\times 10^9nm=413nm[/tex]

conversion used : [tex]1m=10^9nm[/tex]

Therefore, the wavelength of violet light is, 413 nm

Answer:

=14.8 grams

Explanation:

The remaining amount is normally calculated using the formula:

Remaining mass= 1/2ⁿ × Original mass where n is the number of half-lives.

Therefore, original mass= Remaining mass × 2ⁿ

Remaining mass= 2.2 grams

Number of half lives= 2.75 half lives

Original mass= 2.2g × 2²·⁷⁵

=14.8 grams

Answer:

D. Freezing

Explanation:

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Answer:

A. Melting

Explanation:

In the above question we noticed that there is a passage from a regular and well compacted carbon dioxide molecules to molecules in a less compact and lower density pattern after a period of heating. According to this description we can conclude that a physical process called "Melting" occurred, which is the process, where a solid substance (which has very compacted molecules) when heated becomes a liquid substance, with less compacted molecules and lower density.

Melting explains the changeover from heating to solid state to liquid state. Heating causes the temperature of the substance to rise to its melting point. The temperature does not rise while fusion is taking place, that is, only after all the substance has gone into liquid state does the temperature rise again.

The melting point of a substance is the temperature at which that substance changes from solid to liquid state.

Answer:

different

Explanation:

physical properties are the measure the melting point boiling point and freezing point and much more

Answer:

different

Explanation:

Take for example the colligative properties: freezing point depression and boiling point elevation. As their name indicates one measure the decrease of the freezing point and the other one the increment of the boiling point, of a solvent on the addition of a non-volatile solute. So, neither the physical properties of the solvent nor the solute is equal to the physical properties of the solution they made.

Answer:

See explanation ...

Explanation:

Actually, two of the listed statements are correct with respect to the Bohr Model of the atom. Orbitals are defined by specific energy levels relative to the nucleus of the atom that it is associated and electrons can exist in any energy level.

That is, the bases of the Bohr (Concentric Ring) Model of the atom is found in the study of bright line emission spectra of atoms (hydrogen to be specific) in that the bright lines of the spectrum generated are caused by electrons transitioning from higher energy level orbitals to lower energy level orbitals releasing 'discrete' amounts of energy in the form of electromagnetic radiation. The potential energy content of an electron while in a specified energy level (As described by Neils Bohr et.al.) is given by the expression Eₙ = -A/n²; A = 2.18 x 10⁻¹⁸ joules.  When applied to electron transitions, say from the n = 3 level to the n = 2 level, the energy emitted (ΔE₃→₂ = -2.18 x 10⁻¹⁸J(1/2² - 1/3²) = -2.03 x 10⁻¹⁹j. This is the energy carried by a photon having a wavelength of 656.1-nm and can be seen as a red-light band in the bright line spectrum of the Hydrogen atom.

Answer:

Ignore the other answer The answer is B

Explanation:

Answer:

determining how many ozone molecules are lost in the atmosphere

The mole concept can be used to determine the number of ozone molecules are lost in the atmosphere.

The mole concept was introduced by Avogadro. The mole is the SI unit of amount of substance. According to Avogadro, one mole of a substance contains 6.02 × 10^23 atoms, ions, molecules etc. The mole concept is important in many chemical calculations. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.

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Answer:

It gains electrons, reducing its overall charge

Explanation:

When an ion of element gains electrons its overall charge decreases, thus the it reduced.

Consider the half equation involving Iron (III) ions.

Fe³⁺+ e⁻ → Fe²⁺

In this equation, the iron III ion has gained an electron changing then to iron II ions. The charge has thus decreased from 3+ to 2+.

This is a reduction reaction.

Answer:

It gains electrons, reducing its overall charge

Explanation:

Question

what is a molecular Solid

Answer:

A molecular solid is a type of solid in which molecules are held together by van der Waals forces rather than by ionic or covalent bonds.

Explanation:

A molecular solid is a solid consisting of discrete molecules. The cohesive forces that bind the molecules together are van der Waals forces, dipole-dipole interactions.

Molecular solids may be defined as compounds that are composed of distinct molecules which are held together by relatively weak interactions such as van der wall forces, dipole interaction, pie-pie interactions, etc.

Solids may ve defined as those substances of matter that maintain their shape and density when not encompassed. They possess hardness.

Molecular solids have low melting and boiling points due to the presence of relatively weak interaction which easily shatters at very optimum temperature.

Therefore, it is well described above.

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Answer:

=21 neutrons

Explanation:

The atomic mass of an atom is the total sum of the contents of the nucleus (protons and neutrons).

Thus atomic mass = no. of neutrons + no. of protons

Number of protons= The atomic mass-number of protons

= 34 - 13= 21

Answer:

The number of molecules in a mole (known as Avogadro's constant) is defined such that the mass of one mole of a substance, expressed in grams, is equal to the mean molecular mass of the substance. The molecular mass of CO2 = 12+2x16 = 44, so the mass of a mole of CO2 is approximalty 44 grams

Explanation:

Explanation:

Endothermic vs. Exothermic Reactions. An endothermic reaction occurs when energy is absorbed from the surroundings in the form of heat. Conversely, an exothermic reaction is one in which energy is released from the system into the surroundings. The terms are commonly used in the physical sciences and chemistry.

Final answer:

Endothermic reactions absorb energy, causing environmental temperature to decrease, like in photosynthesis, while exothermic reactions release energy, increasing environmental temperature, as seen in the combustion of substances like paper. Energy changes in these reactions are due to bond forming and breaking, with endothermic reactions needing energy input and exothermic reactions releasing energy.

Explanation:

Chemical reactions can broadly be classified into two types: endothermic and exothermic reactions. Endothermic reactions absorb energy from the surroundings, often in the form of heat, leading to a temperature decrease in the environment. A classic example of an endothermic reaction is photosynthesis in plants, where solar energy is absorbed to convert carbon dioxide and water into glucose and oxygen. On the other hand, exothermic reactions release energy, usually causing a temperature increase.

Combustion of substances, such as burning paper, is an exothermic reaction because it releases heat into the surroundings. The energy difference between the reactants and products is what drives these endothermic and exothermic processes, with the former having higher potential energy in the products and the latter having higher potential energy in the reactants.

When considering the energy change during a chemical reaction, it's the formation and breaking of chemical bonds that result in energy being absorbed or released. Endothermic reactions require energy to break bonds within the reactants, leading to a higher potential energy in the products compared to the reactants.

Conversely, exothermic reactions release energy when new bonds are formed in the product molecules, which possess less energy than the reactants. If we were to draw energy graphs for these reactions, an endothermic reaction graph would depict an upward curve from reactants to products, reflecting an input of energy, whereas an exothermic reaction graph would show a downward curve, indicating that energy is released.

Answer:

The top curve/graph is exponential growth. All exponential growth graphs  look like a J in a way! Hope that helped

The first curve is an example of a curve that exhibits exponential growth.

An exponential growth can be defined as a situation in which the population size of a species of organism grows faster and quickly as the population gets larger.

This ultimately implies that, an exponential growth generally result in a population explosion over a period of time.

In conclusion, the curve of an exponential growth typically has a J-like shape and slopes upward as it continues to increase.

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The water plays role in B) dissociation of ionic compounds.

The presence of positively charged end and negatively charged end in the molecule is referred as polarity. Increasingly significant, the extremity of water is in charge of successfully dissolving other polar particles, for example, sugars and ionic mixes, for example, salt. Ionic mixes break down in water to shape particles. This is critical to recall in light of the fact that for most natural responses to happen, the reactants must be disintegrated in water.  

Since water can break down such huge numbers of basic substances, it is known as the all-inclusive dissolvable. Substances that can't be broken down by water, (for example, oils) are called fat dissolvable and are nonpolar, non-ionic exacerbates that are firmly covalently reinforced.  

D) Water dissolves nonpolar covalent substances. Due to its curved form and an uneven distribution of oxygen and hydrogen atoms' electrons, water is a polar molecule. Because of this, it makes a great solvent for polar and ionic chemicals. Water is not a good solvent for nonpolar covalent compounds, though.

Because they lack stable electric dipoles, nonpolar covalent compounds like hydrocarbons (such as oil, gasoline) and certain gases (such as methane, oxygen) do not interact with water strongly. They do not dissolve well in water because they have a tendency to resist water molecules. Because oil is nonpolar and does not dissolve in the polar water, oil and water do not combine.

Therefore, the notion that water dissolves polar and ionic molecules but ineffectively dissolves nonpolar covalent chemicals is most likely accurate. The right response is D.

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Answer:

1/1840 the mass of a C-12 atom

Choice C is correct

Explanation:

The relative mass of an electron is 1/1840 the mass of a C-12 atom . Atomic mass units are expressed relatively to the atomic mass unit of an unbound neutral carbon-12 atom.

d) 1/1840 of hydrogen atom mass is the relative electron mass.

The hydrogen gas is the lightest element and its atomic mass is [tex]\bold{1.67 \times 10^{-27} \ kg}[/tex], same as the mass of proton because it has no neutron and contains one proton and one electron in its atom. But it loses an electron to gain stable electronic configuration leaving only a proton in its atomic structure.

We know, Mass of an electron = [tex]9.11 \times 10^{-31} \ kg[/tex]

[tex]\text{Relative mass of electron} = \frac{\text{Mass of proton}}{\text{Mass of electron}}[/tex]

Relative mass of electron = [tex]\frac{1}{1840}[/tex] the mass of proton

Relative mass of electron = [tex]\frac{1}{1840}[/tex] the mass of hydrogen atom.

Answer:

Slope upward

Explanation:

The amount of carbon dioxide increases daily due to the increased use of petroleum fuels in diesel engines in the industries and by motor car users. The number of petroleum cars increases as their affordability increases. Use of LPG as domestic fuel has increased. These practices increase the amount of carbon dioxide in the atmosphere.

The rate of CO₂ production increases as these activities increases daily.  

Ice has a lower density than liquid water because hydrogen bonding causes water to crystallize with more empty space between molecules than in the liquid state.

Hydrogen bonding is a strong intermolecular force that occurs when hydrogen atoms are covalently bonded to highly electronegative atoms (e.g., nitrogen, oxygen, or fluorine). These hydrogen bonds result in attractive forces between neighboring molecules, contributing to unique properties like high boiling points in substances such as water and the stability of biomolecules like DNA and proteins.

Hydrogen bonding causes water to crystallize with more empty space between molecules than in the liquid state. This is because ice has a unique crystal structure known as a hexagonal lattice, in which water molecules form open spaces or voids between them. The hydrogen bonds in ice are more stable and rigid, allowing the water molecules to arrange themselves in a way that maximizes the empty space between them.

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Ice has a lower density than liquid water because when water freezes, the water molecules form a crystal lattice structure due to hydrogen bonding. This structure creates more space between the molecules and thus a lower density.

The best description for why ice has a lower density than liquid water is Choice A: Hydrogen bonding causes water to crystallize with more empty space between molecules than in the liquid state.

When water freezes into ice, the water molecules form a crystal lattice due to hydrogen bonding. This lattice structure has more space between the water molecules compared to when water is in its liquid state, resulting in a lower density of ice than liquid water.

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