Which of the following best describes the change in Antarctic temperature from about 440,000 years ago to about 340,000 years ago?
A
The temperature increases by about 10 S
B
The temperature decreases by about 8°C.
С
The temperature increases by about 12°C and then decreases by about 12°C.
D
The temperature decreases by about 10°C and then increases by about 12°C.

Answer:

0.05 g/cm^3.

Explanation:

The volume of the block = 9*2*6 = 108 cm^3.

Density = mass/volume

= 5.4 / 108

= 0.05 g/cm^3.

2) The heat capacity of aluminum is 219.44 J/mol.°C.

3) a) the experimental ΔHs of ice is -0.154 kJ/mol.

b) too high

Calculate the heat released by the aluminum:

q = mcΔT

where q = heat released, m = mass of aluminum, c = specific heat capacity of water and ΔT = change in temperature.

q = (24.7 g) (0.903 J/g°C) (100.0°C - 23.4°C)

q = 18643.26 J

Next, calculate the heat absorbed by the calorimeter:

q = mcΔT

q = (99.5 g + 24.7 g) (15.8 J/°C) (23.4°C - 19.5°C)

q = 4009.92 J

The heat released by the aluminum is equal to the heat absorbed by the calorimeter and water:

18643.26 J = 4009.92 J + q3

where q3 = heat absorbed by the water.

q3 = 14633.34 J

Calculate the molar heat capacity of aluminum:

Cp,m = q3 / (nΔT)

where Cp,m = molar heat capacity, n = number of moles of aluminum, and ΔT = change in temperature.

n = m / M

where m = mass of aluminum and M = molar mass of aluminum (26.98 g/mol).

n = 24.7 g / 26.98 g/mol

n = 0.916 mol

Cp,m = 14633.34 J / (0.916 mol * 76.6°C)

Cp,m = 219.44 J/mol.°C

Therefore, the heat capacity of aluminum is 219.44 J/mol.°C.

3) (a) To calculate the experimental ΔHs of ice, we first need to calculate the heat gained by the water and the heat lost by the ice during the process.

Heat gained by water = mass of water × specific heat capacity of water × change in temperature

= 100.0 g × 4.184 J/g·°C × (-20.1°C)

= -8,423.84 J

Heat lost by ice = mass of ice × heat of fusion of ice

= 25.6 g × 6.01 kJ/mol

= 154.496 J

Since the process is assumed to be adiabatic (no heat exchange with the surroundings), the heat gained by the water must be equal to the heat lost by the ice.

Thus, -8,423.84 J = 154.496 J = -8,269.344 J

The negative sign indicates that the process is exothermic. Therefore, the experimental ΔHs of ice is:

ΔHs = -154.496 J/mol = -0.154 kJ/mol

(b) If the student forgets to include the calorimeter term in the calculation, the calculated ΔHs of ice will be too high. This is because the heat absorbed by the calorimeter during the process is not accounted for, leading to an overestimation of the heat gained by the water and underestimation of the heat lost by the ice.

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Answer:

The one cell of a unicellular organism must be able to perform all the functions necessary for life. These functions include metabolism, homeostasis and reproduction. Specifically, these single cells must transport materials, obtain and use energy, dispose of wastes, and continuously respond to their environment.

Answer:

A single celled Organism is able to get energy from complex molecules, to move, and to sense their environment.

Explanation:

The ability to perform these and other functions is part of their organization.

Reagent bottles must be closed when not in use because they may contain volatile or sublime substances.

Reagent bottles are most commonly used to store chemical reagents, including acid and alkali solvents that can be safely stored due to anti-corrosion capabilities.

Reagent bottles, often known as graduated bottles, are glass, plastic, borosilicate, or related-substance containers with specific caps or stoppers. They are used in labs to store chemicals in liquid or powder form in cabinets or on shelves.

Some reagent bottles are tinted amber (actinic), brown or red to protect light-sensitive chemical compounds from visible light, ultraviolet and infrared radiation which may alter them; other bottles are tinted blue (cobalt glass) or uranium green for decorative purposes -mostly vintage apothecary sets.

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Answer:

violet light

Explanation: ck12 says so

Answer:

0.551 moles

Explanation:

To calculate the number of moles in 22 grams of argon, divide the mass by the molar mass:

Number of moles = Mass / Molar mass

Number of moles = 22 g / 39.95 g/mol

Number of moles ≈ 0.551 moles

Therefore, there are approximately 0.551 moles of argon in 22 grams of argon.

Answer:

a. Are potentially dangerous and should not be worn.

Answer:

Magnesium

Explanation:

The answer is Magnesium

Answer: metal turn orange and weaker as it gets oxidised

Explanation:

Explanation:

CH4, methane is a non polar compound whereas CH3Cl is a polar compound because of presence of electronegative element chlorine. Hence, there is a net dipole moment in case of CH3Cl( Chloromethane). This causes CH3Cl to exhibits dipole-dipole intermolecular force of attraction, which is absent in CH4. Therefore, Chloromethane has a lower vapor pressure when compared to methane.  

Answer:

0.032 mole

Explanation:

Please mark me as brainliest

Answer:

your answer is the one that is highlighted cuz

Explanation:

Answer:

The ability of an atom to accept an electron.

Explanation:

Electron affinity is measured by observing the energy change of a substance when an electron is added to it in its neutral gas form. For example, elements that are on the far right of the periodic table (excluding noble gases) are more likely to accept electrons rather than give them up. This is why Fluorine has the highest electron affinity of all atoms on the periodic table.

The heat energy given off when liquid mercury at 28.9 °C is converted to solid mercury at its melting point is 284.2 J.

The heat energy given off when liquid mercury at 28.9 °C is converted to solid mercury at its melting point is determined as follows:

Moles of Mercury:

14.0 g Hg x 1 mol Hg/201 g = 0.0697 moles

Heat released:

q = heat = m x C x ∆T

25ºC = 298.15K

25ºC = 298.15K

∆T = 234.32  K- 298.15 K

∆T = 63.83 K

q = (0.0697 mol)(28.0 J/molK)(63.83K) = 124.6 J

The heat released from liquid to solid:

q = m x ∆H fusion = (0.0697 mol)(2.29 kJ/mol)

q = 0.1596 kJ

q  = 159.6 J

The total heat energy is given off:

Qtotal = 124.6 J + 159.6 J

Qtotal = 284.2 J

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Complete question:

Calculate the heat energy released when 14.0 g of liquid mercury at 28.9 °C  °C is converted to solid mercury at its melting point.

Answer:

0.13475 mol

Explanation:

From this question sally knows that n= 2

MCln = MCl

[Mn+] using nernst equation = 8.279

The volume of the resulting mixture Mn+ = 8.138 ml

The number of moles mn+ =

8.279 x 8.138

= 67.375mmol

= 0.067375

Since n = 2

The mold of cl- that must be dissolved in the compartment

= 0.067375 x 2

= 0.13475 mols

Answer:

Plates at our planet's surface move because of the intense heat in the Earth's core

Explanation:

Hopefully this helps, I believe in you! ^^

Answer/Explanation:

movement can be cause by the intense heat in the earth's core, which causes molten rock in the mantle layer to move.  it moves in a pattern called 'convection cell' which can form when the warm material rises, then cools, and eventually sink down.  then the process repeats (cooled, warms up and rises.. etc..)

I hope this was what you were kinda looking for:) - T

PS. HAVE A GOOD DAY! I LIKEYOUR PROFILE HAFHAS

Answer:

Exothermic Reaction/ Combination Reaction

Explanation:

It is a combination reaction and the nature of the reaction is exothermic.  

Daria had some beach sand with her. The sand has a 72 gramme mass. She calculated the volume using the graduated cylinder below. The graduated cylinder contains 15 mL of sand.

The volume of the sand is calculated using the graduated cylinder below. The sand's bulk is specified as 72 grammes.

We can use the water displacement method to calculate the volume of the sand. Following is a description of how to estimate the amount of sand using the water displacement method:

The graduated cylinder of water should first be measured for volume.

The graduated cylinder's water volume should then be measured after adding the sand to it. The volume of water increases by the same amount.

Let's use the provided problem to implement this approach.

In the beginning, there is 10 mL of water in the graduated cylinder. The graduated cylinder contains 25 mL of water once the sand has been added.

The amount of sand is therefore equal to the difference between the two volumes, which is: Sand volume equals final water volume minus initial water volume (25 - 10 = 15 mL).

As a result, there are 15 mL of sand in the graduated cylinder.

Answer : 15

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When answering questions on the platform Brainly, it is important to be factually accurate, professional, and friendly. It is also important to be concise and not provide extraneous amounts of detail, and to use the following terms in your answer if they are relevant to the question at hand:In regards to the question at hand:Consider two solutions of the weak acid HCN, one with concentration 0.10 M and one with concentration 0.010 M.

Which statements correctly describe these solutions?A weak acid, HCN, has an ionization constant, Ka. The equation for this is: Ka = [H3O+][CN-] / [HCN]The ionization constant, Ka, can be expressed in terms of its logarithm, pKa, as follows: pKa = -log(Ka)The relationship between the percent dissociation and the ionization constant is shown in the following equation: %dissociation = (concentration of ionized H+ / initial concentration of acid) * 100The following statements are correct:O The 0.10 M solution will have a higher [H3O+].This statement is correct as the concentration of H+ ions is directly proportional to the concentration of HCN, and the 0.10 M solution will have more H+ ions than the 0.010 M solution.O The 0.010 M solution will have a higher percent dissociation.This statement is also correct as the percent dissociation is inversely proportional to the concentration of the weak acid, and the 0.010 M solution will have a higher percent dissociation.O The 0.010 M solution will have a higher pKa value.This statement is incorrect as the pKa value is inversely proportional to the ionization constant, and thus the 0.10 M solution will have a higher pKa value.Answers:O The 0.10 M solution will have a higher [H3O+].O The 0.010 M solution will have a higher percent dissociation.

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The medicine that has to be given by the nurse to prevent cerebral palsy in the new-born is magnesium sulphate.

The term "cerebral palsy" refers to a collection of conditions that impair mobility and posture development and are thought to be caused by non-progressive abnormalities. Insults that caused cerebral palsy are thought to have happened during foetal development or early childhood. A significant risk factor for cerebral palsy is preterm delivery, and that risk rises sharply as gestational age decreases. Right now, 25% of all new occurrences of cerebral palsy are caused by babies delivered before 34 weeks of pregnancy. Cerebral palsy risk is higher when there are several pregnancies. MgSO4 was infused continuously at a rate of 2 g/h for up to 12 hours after a 6 g loading dose. Given before delivery, magnesium sulphate is known to regulate the vasculature and minimize hypoxia effects by neutralising cytokine or excitatory amino acid damage, which may lower the risk.

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Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, given elements can be classified as  compound and molecules.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

SO₂, N₂O5,  CH₁ , Kerr,  LiF are compound

O₂,  O\(_3\), P4 are molecules

Sg, Cs, O, S are neither molecules nor compounds

Therefore, given elements can be classified as  compound and molecules.

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3.4x10^4 = 34000

3.4×104 = 3.4 ×10000 = 34×1000=34000

In linguistics, ordinal integers or ordinal digit words are terms representing place or rank in sequential ordering; the order may be of a size, significance, record, and so on (e.g., "third", "tertiary").

They vary from cardinal digits, which mean quantity (e.g., "three") and other kinds of numerals.

Thus, 34000 is the answer.

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According to the claim, Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303. (orange is 1.303 times more effused than blue).Relative rate of effusion for the orange to blue spheres = 1.531.

The process of effusion is when a gas escapes from a container through a hole that is significantly smaller in diameter than the molecules' mean free path.

Gas molecules flow through a small opening in one container and into another by effusion. Graham's law allows rates of effusion to be compared at the same temperature. Diffusion is the random molecular motion-based movement of gas molecules through one or more other types of gas.

Rate of effusion of Orange / Rate of effusion of blue

= [Mblue / Morange]^1/2

Vrms = sqrt [(3RT/M)]

Vorange / Vblue = [ Mblue / Morange]^1/2

Rate of effusion of Orange / Rate of effusion of blue

= 565/ 369

= 1.531

Thus,  Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303.

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Isotopes are defined as same atomic number and different mass number. Two isotopes of hydrogen they have different numbers of neutrons.

Isotopes are two or more different kinds of atoms that have the same atomic number and place in the periodic table but have different numbers of neutrons in their nucleus, resulting in differing nucleon numbers.

Isotopes are atoms that are part of the same element and have the same atomic number Z but a different mass number A. For instance, three isotopes of the element carbon, having respective masses of 12, 13, and 14, are carbon-12, carbon-13, and carbon-14.

Thus, Two isotopes of hydrogen they have different numbers of neutrons.

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Answer:

They have different numbers of neutrons.

Explanation

Answer:

The cell potential for the given galvanic cell is 0.188 V.

Explanation:

To calculate the cell potential, we can use the Nernst equation:

Ecell = E°cell - (RT/nF)ln(Q)

where E°cell is the standard cell potential, R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin (25°C = 298 K), n is the number of moles of electrons transferred (in this case, n = 2), F is the Faraday constant (96,485 C/mol), and Q is the reaction quotient.

First, we need to write the half-reactions and their standard reduction potentials:

Sn4+(aq) + 2e- → Sn2+(aq) E°red = 0.15 V

Fe3+(aq) + e- → Fe2+(aq) E°red = 0.77 V

The overall reaction is the sum of the half-reactions:

Sn2+(aq) + 2Fe3+(aq) → Sn4+(aq) + 2Fe2+(aq)

The reaction quotient Q can be expressed as:

Q = [Sn4+][Fe2+]^2 / [Sn2+][Fe3+]^2

Substituting the given concentrations, we get:

Q = (0.00655)(0.01139)^2 / (0.0624)(0.0437)^2 = 0.209

Now we can calculate the cell potential:

Ecell = 0.15 V + 0.0592 V log([Fe2+]^2/[Fe3+]) + 0.0592 V log([Sn4+]/[Sn2+])

= 0.15 V + 0.0592 V log(0.01139^2/0.0437^2) + 0.0592 V log(0.00655/0.0624)

= 0.188 V

Therefore, the cell potential for the given galvanic cell is 0.188 V.

The cell potential for the given galvanic cell in which the given reaction occurs at 25 °C is 0.188 V.

To find the cell potential, we take the Nernst equation:

Ecell = E°cell - (RT/nF)ln(Q)

In which R is the gas constant (8.314 J/mol·K) and E° cell is the standard cell potential.

T temperature in Kelvin (25°C = 298 K), and n is the number of moles of electrons transferred (n = 2), Q is the reaction quotient and F is the Faraday constant (96,485 C/mol).

Firstly, write the half-reactions and then their standard reduction potentials:

Sn⁴⁺(aq) + 2e⁻  → Sn²⁺(aq) E°red = 0.15 V

Fe³⁺(aq) + e⁻ → Fe²⁺(aq) E°red = 0.77 V

The overall reaction is the sum of the half-reactions:

Sn²⁺(aq) + 2Fe³⁺(aq) → Sn⁴⁺(aq) + 2Fe²⁺(aq)

The Q reaction quotient can be written as:

Q = [Sn⁴⁺][Fe²⁺]² ÷ [Sn²⁺][Fe²⁺]²

Substituting the given concentrations, we observe:

Q = (0.00655)(0.01139)² ÷ (0.0624)(0.0437)² = 0.209

Next, we can find the cell potential:

Ecell = 0.15 V + 0.0592 V log([Fe²⁺]²/[Fe³⁺]) + 0.0592 V log([Sn⁴⁺]/[Sn²⁺])

= 0.15 V + 0.0592 V log(0.01139²÷0.0437²) + 0.0592 V log(0.00655÷0.0624)

= 0.188 V

Thus, the cell potential for the given galvanic cell is 0.188 V.

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The mixture contains 8.89% ammonium chloride.

Percent ammonium chloride = (mass of ammonium chloride / total weight of mixture) x 100

Percent ammonium chloride = (0.942 g / 10.618 g) x 100

Percent ammonium chloride = 8.89%

So, the mixture contains 8.89% ammonium chloride.

What is the amount?

The amount of substance (n) means the number of particles or elementary entities in a sample. It is also called the chemical amount. The unit for the amount of substance is the mole. An elementary entity is the smallest amount of a substance that can exist.

How do you find the percentage of a mixture in chemistry?

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Latent heat of vaporization measures the amount of heat that is required to change one unit of mass of substance from liquid state to a gaseous state at constant temperature and pressure.

Latent heat of vaporization is a physical property of substance, and it measures the amount of heat required to change one unit of mass of  substance from liquid to gaseous state at constant temperature and pressure.

Latent heat of vaporization is the amount of energy required to overcome the intermolecular forces holding liquid molecules together and convert the substance from liquid to a gas phase.

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If the partition is removed and the gases mix adiabatically and completely, the change in entropy is equal to 263 K.

What is entropy?

The measure of a system's chaos is called entropy. It is an extensive property of a thermodynamic system, which means that the amount of matter in the system affects how much it is worth. Entropy is frequently represented in equations by the letter S and is measured in joules per kelvin (JK%-1) or kg/m^2/s^-2K^-1. The entropy of a highly ordered system is low.

Lets assume nitrogen is an ideal gas with CV=5R/2

and assume argon is also an ideal gas with CV=3R/2

n₁=4 moles

n₂=2.5 moles

t₁ = 5°C,  in kelvin t₁= 5+273

t₁ = 278 K

t₂=1°C,  in kelvin t = 1+273

t₂= 273 K

u=пCVΔT

U(N₂)+U(Ar)=0

putting values:

4x(5R/2)x(T(final)-278) = 2.5x(3R/2)x(T(final)-273)

by simplifying:

T(final) = 263K

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The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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