Which statement describes both homogeneous mixtures and heterogeneous mixtures?

A.
Their components can be distinguished visually.
B.
Their components are combined in a fixed ratio.
C.
Their components can be separated by physical processes.
D.
They always contain a liquid component.
E.
They are considered to be pure substances.



#2 image provided: question: Select the atomic models that belong to the same element.

What is the SI unit used to measure the temperature of a substance?

A.
degree Celsius
B.
degree Fahrenheit
C.
gram
D.
kelvin
E.
mole

Answer:

Percent by mass

Explanation: I think

Percent by mass represents the number of grams of a solute in 100 grams of a solution. This is because it is the mass of the solute divided by the total mass of the solution, multiplied by 100.

The option that represents the number of grams of a solute in 100 grams of a solution is Percent by mass. The definition of percent by mass in a solution, also known as mass percent, is the mass of the solute divided by the total mass of the solution, all multiplied by 100. Therefore, if you have a solution of 100 grams total, and you want to find out how many grams of solute you have in this solution, you would use percent by mass to calculate this.

Density, molarity, and volume have different uses and definitions in chemistry. Density is mass per unit volume, molarity is a measure of the concentration of a solute in a solution, and volume refers to the amount of space that matter occupies.

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Explanation : Gases, unlike solids and liquids, have neither fixed volume nor shape. They are molded entirely by the container in which they are held. We have three variables by which we measure gases: pressure, volume, and temperature. ... From this, we derive the molar volume of a gas (volume/moles of gas).

Answer : The volume is determined by the pressure, the amount of gas present, and the temperature.

The molecular mass is the sum of the atomic masses of the atoms.

Atomic mass :

H = 1.01 amu

Cl = 35.45 amu

HCl = 1.01 + 35.45

HCl = 36.46 grams/mole

Therefore:

1 mole of HCl is equivalent to 36.46 grams/ mole

answer C

Answer : The correct option is, (C)  [tex]2.57\times 10^{24}[/tex]

Solution for Part 1 : Given,

Mass of [tex]K_2S[/tex] = 235 g

Molar mass of [tex]K_2S[/tex] = 110.262 g/mole

First we have to calculate the moles of [tex]K_2S[/tex].

[tex]\text{Moles of }K_2S=\frac{\text{Mass of }K_2S}{\text{Molar mass of }K_2S}=\frac{235g}{110.262g/mole}=2.13moles[/tex]

Now we have to calculate the number of atoms of potassium in the given compound.

In the given compound, there are 2 atoms of K and 1 atom of S.

As, 1 mole contains [tex]2\times 6.022\times 10^{23}[/tex] number of potassium atoms

So, 2.13 moles contains [tex]2.13\times 2\times 6.022\times 10^{23}=2.57\times 10^{24}[/tex] number of potassium atoms

Therefore, the number of potassium atoms in given compound is,  [tex]2.57\times 10^{24}[/tex]

Explanation for Part 2 :

Statement 1 : A balloon shrinks when it's taken outside in the winter.

This statement follow the Charles's law. There is a direct relation between the temperature and volume. As the temperature decreases, the volume also decreases and vice-versa.

Statement 2 : A closed, flexible container expands when it's heated.

This statement follow the Charles's law. There is a direct relation between the temperature and volume. As the temperature increases, the volume also increases and vice-versa.

Statement 3 : When the size of an air chamber is increased, the air pressure decreases.

This statement follow the Boyle's law. There is an inverse relation between the pressure and volume. As the pressure decreases, the volume increases and vice-versa.

Statement 4 : Pressing on an inflated balloon decreases its size.

This statement follow the Boyle's law. There is an inverse relation between the pressure and volume. As the pressure increases, the volume decreases and vice-versa.

Statement 5 : A balloon expands when air is blown into it.

This statement follow the Avogadro's law. There is a direct relation between the number of moles of gas and volume. As the number of moles of air increases, the volume also increases and vice-versa.

Answer:

2.57 x 10^24

Explanation:

This is correct! :)

Hey there!:

Number of moles of iron:

Molar mass iron:  55.85 g/mol

0.676 / 55.85 => 0.012 moles of iron

Number of moles of fluorine:

Molar mass fluorine : 19 g/mol

0.460 / 19 => 0.024 moles of fluorine

Number of moles of water:

Molar mass water : 18.02 g/mol

0.870 / 18.02 => 0.048 moles of water

Simplest  mol ratio is :

iron ( Fe ) = 0.012 / 0.012 => 1.0 mol

Florine ( F ) = 0.024 / 0.012 => 2.0 moles

Water ( H2O ) = 0.048 / 0.012 =>  4 moles

Therefore:

Empirical formula is:

FeF2.4H2O

Hope that helps!

Sorry for the delay, here's the Lewis Dot Structure of Chloramine

The Lewis structure for chloramine (NH2CI) is complete with all atoms having full octets and a total of 26 valence electrons used.

To complete the Lewis structure for chloramine (NH2CI), follow these steps:

Step 1: Determine the total number of valence electrons in the molecule.

Nitrogen (N) has 5 valence electrons.

Hydrogen (H) has 1 valence electron, but there are 2 hydrogen atoms, so we have 2 valence electrons.

Chlorine (Cl) has 7 valence electrons.

Total valence electrons = 5 (N) + 2 (H) + 7 (Cl) = 14 valence electrons.

Step 2: Connect the atoms with single bonds.

Place the nitrogen (N) in the center, and the hydrogen (H) and chlorine (Cl) atoms around it. Connect each atom to the nitrogen atom with a single bond.

H

N -- C -- Cl

/

H

Step 3: Distribute the remaining valence electrons to complete the octet of each atom.

Start by placing the remaining electrons around the hydrogen and chlorine atoms since they only need 2 electrons to complete their outer shells (duet rule).

H H

\ /

N -- C -- Cl

/

H

Step 4: Distribute the remaining valence electrons to complete the octet of the nitrogen atom.

Since nitrogen needs 8 electrons to complete its octet (octet rule), we place the remaining electrons around the nitrogen atom.

H    H

|    |

N - C - Cl

|| |

H H

Step 5: Check the total number of valence electrons used.

Count the number of valence electrons used in the Lewis structure.

2 (H) + 8 (N) + 8 (C) + 8 (Cl) = 26 valence electrons used.

Step 6: If there are extra valence electrons remaining, try forming double or triple bonds to complete octets.

In this case, all atoms have complete octets, and there are no extra valence electrons remaining.

The Lewis structure for chloramine (NH2CI) is complete with all atoms having full octets and a total of 26 valence electrons used.

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boyles law states that the volumes of a gas will decrease as pressure increases if the temperature remains constant.

charles law states that the volume of a gas will increase as temp increases if the pressure remains constant.

gay-lussacs law states that the pressure increases as temp increases if the volume remains constant.

moles has been the constant

The phosphodiester bonds contains a sugar attached to a phosphate group. Since one outermost phosphate is used to form a phosphate bond everytime, from a precursor containing innermost radiolabelled phosphate, the third phosphate groups will be radioactive in nature. So correct answer is 3.

Hope that helps!

The molar mass is the sum of the mass of all the atoms of a particular molecule.

The unit  of molar mass is grams per mole.

The atomic mass of H = 1.00

The atomic mass of N = 14.00

The molar mass of ammonia = atomic mass of N + 3 x (atomic mass of H)

                                                = 14.00 + 3 x (1.00) = 17.00

Therefore the molar mass of ammonia is 17g/mol

The correct answer is  17g/mol.

thermal conductivity

Answer:

Thermal conductivity

Explanation:

Electron shielding effects reduces the effect of a full nuclear charge. As more of the core electrons are added, they begin to 'shield' the valence electrons from the increasingly positive nucleus. But this will allow the outer electrons to move farther away from the nucleus, hence increasing atomic size. The electron shielding effect is responsible for the increase in atomic size moving down groups.

B. Calcium has electrons in more energy levels than magnesium.

B. Calcium has electrons in more energy levels than magnesium.

Final answer:

Homeostasis is the process by which the body maintains constant conditions. The body strives to keep temperature, blood glucose level, and blood pH constant. Disruptions to these can be countered by physiological responses to restore equilibrium.

Explanation:

Homeostasis is the process by which the body strives to maintain constant conditions. Three things that the body strives to keep constant are temperature, blood glucose level, and blood pH.

Temperature can be disrupted from equilibrium when the body is exposed to cold or hot temperatures. In response, the body can constrict blood vessels and shiver to generate heat or sweat and dilate blood vessels to cool down.

Blood glucose level can be disrupted when it rises after a meal. The body responds by releasing insulin, which helps lower blood glucose levels by facilitating the uptake of glucose by cells or storing glucose as glycogen in the liver.

Lastly, blood pH can be disrupted by an increase or decrease in acidity. The body can respond by adjusting the breathing rate to eliminate excess carbon dioxide or increasing the production of bicarbonate ions in the kidneys to restore pH balance.

The normal condition of the mole of a gas is 22.44L.

The volume of CH4 = 8.9L

To get the number of moles we get,

8.9 / 22.44 = 0.397 moles.

The ratio of CH4 : H2O = 1: 2

The mole of water is 0.379 × 2 = 0.794 moles.

While we convert it into liters it will be

0.794 × 22.414 = 17.80L

The answer is 17.80 liters of water vapour which will be produced.

Given information:

Concentration of HCl = 0.035 M

To determine:

pH of the solution

Explanation:

Hydrochloric acid, HCl is a strong acid. It will completely dissociate to give H+ and Cl- ions

HCl → H+ + Cl-

Hence the concentration of H+ = Cl- = 0.035M

Now, pH measures the strength of H+ ions in a given solution. It is expressed as:

pH = -log[H+]

pH (HCl) = -log(0.035) = 1.46

Ans: pH of 0.035M HCl is 1.46

granite is a harder n tougher rock than marble so

If granite and marble were exposed in an area with a hot and humid climate,

A.the marble would weather more rapidly.

Rock weathering by hot and humid climate is dependent on the rock's strength and hardness. Marble is weaker and softer than Granite. So A. the marble would weather more rapidly.

I believe the answer to this is true.

Paper chromatography is a tool frequently used in analytical chemistry to separate a homogeneous mixture into its components.

In paper chromatography the stationary phase is water which drenches the paper and the mobile phase is a mixture polar organic solvent and water. The various components of the homogeneous mixture is separated based on their relative solubility in either the mobile or stationary phase.

Vertebrae hope that helps :)

Answer: The reason is the number of degenerate electrons.

Explanation:  Transition elements are the only elements in the periodic table which are capable of showing variable oxidation states.

Tranistion elements has 'd orbitals' as their penultimate shells which are not perfectly shielded by the inner orbitals. And these d orbitals can occupy 10 electrons in their 5 orbitals.

Thus they can easily lose electrons as the energy of the electrons are the similar or better say that they are degenerate.

condensation

Condensation is the change of water from its gaseous form (water vapor) into liquid water. Condensation generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.

Condensation is the reverse of vaporization.

Answer:

Condensing...

Explanation:

The 4 water cycles,  evaporation, condensation, precipitation and collection, are what is happening here...... at least one of them. Condensation is when "water which collects as droplets on a cold surface when humid air is in contact with it" as defined in the dictionary or in this case, when a subject is changing from a vapor to a liquid. I hope this helps!  

Answer : The specific heat of metal is, [tex]0.261J/g^oC[/tex]

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

[tex]q_1=-q_2[/tex]

[tex]m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)[/tex]

where,

[tex]c_1[/tex] = specific heat of unknown metal = ?

[tex]c_2[/tex] = specific heat of water = [tex]4.18J/g^oC[/tex]

[tex]m_1[/tex] = mass of unknown metal = 29.950 g

[tex]m_2[/tex] = mass of water = 50.0 g

[tex]T_f[/tex] = final temperature of water = [tex]27.7^oC[/tex]

[tex]T_1[/tex] = initial temperature of unknown metal = [tex]100^oC[/tex]

[tex]T_2[/tex] = initial temperature of water = [tex]25.0^oC[/tex]

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

[tex]29.950g\times c_1\times (27.7-100)^oC=-50.0g\times 4.18J/g^oC\times (27.7-25.0)^oC[/tex]

[tex]c_1=0.261J/g^oC[/tex]

Therefore, the specific heat of metal is, [tex]0.261J/g^oC[/tex]

The correct answer is 230 mmHg.

When liquid water boils at 100°C, the water vapor pressure is 760 mmHg

Hence, when liquid water boils at 50°C, the water vapor pressure is (760/2) mmHg or 230 mm Hg.

As the boiling temperature of water halves so does the vapor pressure of water. This is in accordance to Pressure Law.

According to Pressure law, pressure is directly proportional to the absolute temperature, at constant volume.

Answer:

230 mmHg

Explanation:

Answer:

[H₃O⁺] = 6.31 x 10⁻² mol·L⁻¹

Explanation:

pH = -log[H₃O⁺], so [tex][\text{H}_{3}\text{O}^{+}] = 10^{- \text{pH}} \text{ mol/L}[/tex]

[tex][\text{H}_{3}\text{O}^{+}] = 10^{-1.20}\text{ mol/L} = 6.31 \times 10^{-2}\text{ mol/L}[/tex]

Answer:

[tex]6.31*10^{-2}[/tex]

Explanation:

Hello! To calculate the pH we have the following formula:

ph = -log [H3O +]

In this case we have the pH value so the formula is

[H3O +] =  [tex]10^{-pH}[/tex]

[H3O +] =  [tex]10^{-1.2}[/tex]

We use the inverse of the log

[H3O +] = [tex]6.31*10^{-2}[/tex]

So the correct answer is [tex]6.31*10^{-2}[/tex]

Answer is a chemical change.

As a result of a chemical reaction, a substance is changed into new substances which involves a chemical change.

During a chemical reaction, atoms of a molecule within a substance are rearranged into different combinations by combining with the atoms of another substance to form new substances.

An example of a chemical change is the composition of sodium chloride (salt) where the atoms of sodium and chlorine combine and rearrange themselves to form salt.

Hey there!:

Using relation:

Δt = Kf  * m

For water , Kf = 1.86 K/molal

Putting values:

Δt = 1.86 * 0.24

Δt = 0.446

So , Freezing point = - 0.446ºC

Answer A

Hope that helps!

The depression in freezing point here for the sugar solution is 0.466 degree Celsius. Hence the freezing point of the sugar solution is  -0.446. Hence, option A is correct.

Freezing point of a solution is the temperature at which the solution changes from liquid to solid state.

To determine the freezing point of a solution of sugar dissolved in water, we need to use the freezing point depression equation:

ΔTf = Kf × molality

where ΔTf is the change in freezing point, Kf is the freezing point depression constant for the solvent (water in this case), and molality is the concentration of the solution expressed in moles of solute per kilogram of solvent.

Assuming a Kf of 1.86 °C/m for water, and a molality of 0.24 m for the sugar solution, we can calculate the change in freezing point:

ΔTf = 1.86 °C/m × 0.24 m = 0.4464 °C

This means that the freezing point of the solution will be lowered by 0.4464 °C compared to the freezing point of pure water. Since the freezing point of pure water is 0 °C, the freezing point of the sugar solution will be:

0 °C - 0.4464 °C = -0.4464 °C

Therefore, the freezing point of the solution is approximately -0.4464 °C, which is closest to option A. -0.446.

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