An eccentric chemistry professor (not mentioning any names) stops in every day and orders 250ml of Sumatran coffee at precisely 60.0°C. You then need to add enough milk at 3.00°C to drop the temperature of the coffee, initially at 80.0°C, to the ordered temperature.

Calculate the amount of milk (in ml) you must add to reach this temperature. Show all your work in the provided spaces.

In order to simplify the calculations, you will start by assuming that milk and coffee have the specific heat and density as if water. In the following parts, you will remove these simplifications. Solve now this problem assuming the density is 1.000 g/ml for milk and coffee and their specific heat capacity is 4.184 J/(g ºC).

Following is the classification of given substances:

Atomic element: Ag

Molecular element: F₂

Molecular compound: CO

Ionic compound: PbI₄

Molecules, groups of two or more atoms that form the smallest identifiable unit that can divide a pure substance and that retain the composition and chemical properties of that substance.

An atom consists of a single positively charged nucleus surrounded by a cloud of negatively charged electrons. As the atoms approach, the electron clouds interact with each other and with the nucleus. This interaction causes atoms to combine to form molecules when the energy of the entire system is reduced. From a structural point of view, a molecule consists of a collection of atoms joined by valences. A diatomic molecule contains two atoms chemically bonded together. When two atoms are identical, like oxygen (O2) molecules, they form a homonuclear diatomic molecule, but when the atoms are different, like carbon monoxide (CO) molecules, they are heteronuclear. Forms a diatomic molecule. Molecules containing two or more atoms are called polyatomic molecules. B. Carbon dioxide (CO2) and water (H2O). A polymer molecule can contain thousands of constituent atoms.

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Small changes in traits that cause variation are frequently caused by mutation.

This is an alteration in the nucleic acid sequence of the genome of an organism, virus, or extrachromosomal DNA which could contain either DNA or RNA.

Genetic variation on the other hand is the difference in DNA among individuals or the differences between populations and it is caused by mutation which is what is responsible for the difference in the features which are observed in an organism thereby making it the correct choice.

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Answer:

1.17 L of H₂

Explanation:

We'll begin by calculating the number of mole in 2.3 g of Mg. This can be obtained as follow:

Mass of Mg = 2.3 g

Molar mass of Mg = 24 g/mol

Mole of Mg =?

Mole = mass /molar mass

Mole of Mg = 2.3 / 24

Mole of Mg = 0.096 mole

Next, we shall determine the number of mole of H₂ produced by the reaction of 2.3 g (i.e 0.096 mole) of Mg. This can be obtained as follow:

Mg + 2HCl —> MgCl₂ + H₂

From the balanced equation above,

1 mole of Mg reacted to 1 mole of H₂.

Therefore, 0.096 mole of Mg will also react to produce 0.096 mole of H₂.

Finally, we shall determine volume of H₂ produced from the reaction. This can be obtained as follow:

Number of mole (n) of H₂ = 0.096 mole

Pressure (P) = 2 atm

Temperature (T) = 298 K

Gas constant (R) = 0.0821 atm.L/Kmol

Volume (V) of H₂ =?

PV = nRT

2 × V = 0.096 × 0.0821 × 298

Divide both side by 2

V = (0.096 × 0.0821 × 298) /2

V = 1.17 L

Therefore, 1.17 L of H₂ were obtained from the reaction.

Answer:

1.04 moles of AlCl₃

Explanation:

Balanced Equation:  2Al°(s) + 3Cl₂(g) => 2AlCl₃(s)

Approach => convert given data (28 g Al°) to moles. The number of moles  AlCl₃ would equal the number of moles aluminum because coefficients for Aluminum and Aluminum Chloride are equal.

moles Al° = (28g)/(27g/mole ) = 1.04 mole Al°

From balanced equation moles AlCl₃ produced equals moles of Al° produced = 1.04 mole AlCl₃ because coefficients of Al° & AlCl₃.

On the basis of oxidation number considerations, the oxide that would not react with molecular oxygen is SO3. This is because sulfur already has the maximum oxidation number of +6 in this compound.

Oxidation number is a measure of the number of electrons that an atom has lost or gained in a compound. In the case of NO, nitrogen has an oxidation number of +2, so it can still react with oxygen to form NO2, where nitrogen has an oxidation number of +4. Similarly, in N2O, nitrogen has an oxidation number of +1, so it can also react with oxygen to form a compound with a higher oxidation number, such as N2O3 or N2O5. In P4O6, phosphorus has an oxidation number of +3, so it can also react with oxygen to form P4O10, where phosphorus has an oxidation number of +5.

However, in SO3, sulfur already has the maximum oxidation number of +6, so it cannot react with oxygen to form a compound with a higher oxidation number. Therefore, SO3 is the oxide that would not react with molecular oxygen.

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Thus, the heat of fusion of water is 79.9 cal/g. If a 5 g piece of ice melts in 100 g of water at 30.0 °C in an insulated bottle, the final temperature of the water is 35071 °C.

Heat of fusion is defined as the amount of heat required to turn 1g of solid into a liquid without causing a temperature change. The term "heat of fusion" refers to the energy needed to melt a specific quantity of a solid at its melting point temperature.

To calculate final temperature

\(\rm q = mc \Delta\ T\)

Δ T = T(initial) - T(final)

T(final)= m × c × q - T(initial)

T(final)= 79.9 x 4.184 x 105 - 30.0

T(final)= 35071.6 °C

Thus, the heat of fusion of water is 79.9 cal/g. If a 5 g piece of ice melts in 100 g of water at 30.0 °C in an insulated bottle, the final temperature of the water is 35071 °C.

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Iron released 2.495 joules of heat.

To calculate the amount of heat absorbed or released by 90.23g of iron, we need to use the specific heat of iron and the change in temperature.

Iron has a specific heat capacity of 0.45 J/g °C, which means that it takes 0.45 Joules of energy to raise the temperature of 1 gram of iron by 1 degree Celsius.

First, we need to convert the mass of iron from grams to kilograms.

Iron mass = 90.23 g = 0.09023 kg

Now we need to calculate the temperature change. The initial temperature of the iron is T = 86°C, but the final temperature is unknown. Assuming that the iron undergoes a process that neither loses nor gains heat through the environment, the following equation can be used.

heat absorbed = heat released

This means that the amount of heat absorbed by iron is equal to the amount of heat given off by the environment. So you can use the following formula:

Heat absorption = mass x specific heat capacity x temperature change

Since there is no heat loss or gain to the environment, we can assume that the temperature of the environment is constant at 25°C. So the temperature change is:

temperature change = final temperature - initial temperature

Temperature change = 25°C - 86°C

Temperature change = -61°C

Note that the temperature change is negative because iron loses heat.

Now you can insert the value.

Heat absorbed = 0.09023 kg × 0.45 J/g °C × (-61 °C)

heat absorbed = -2.495 J

Since the value is negative, this indicates that the iron lost heat to the environment and the environment gained heat.

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When the molecules shown are vaporized, the speed of molecule A will be greatest because of its relatively small size.

When a molecule is vaporized, its size can affect its speed in a couple of ways. The speed of a molecule is related to its kinetic energy, which is influenced by factors such as temperature and mass.

When comparing two molecules that have been vaporized at the same temperature, the smaller molecule will tend to have a higher speed than the larger molecule.

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Answer: The answer is incus

Answer:

19.29 g/\(cm^{3}\)

Explanation:

Gold nugget - what we know:

Density's formula: (g/\(cm^{3}\))

Gold volume: 1.68 \(cm^{3}\)

Gold mass: 32.4 g

Use the density formula to find the density of the gold nugget:

= (g ÷ \(cm^{3}\))

= (32.4 ÷ 1.68)

= 19.285 g/\(cm^{3}\)

Therefore the gold nugget has a density of 19.29 g/\(cm^{3}\)

Answer:

Explanation:

No se

According to the given statement 1812.5 g mass of solution can be prepared.

When one substance dissolves, or separates into the other, a solution is created. A solute is the name for the material that dissolves to create a solution. A solvents is the material that a solution will dissolve in. Sugar is the solute while water is the solvent in a sugar syrup.

8.0% by mass NaCl means 8 g NaCl in a total of 145 g solution. (note it is g of total solution)

Use dimensional analysis:

145 g NaCl x 100 g solution/8 g NaCl

= 1812.5 g solution

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Initially, we will consider only solutions of a solid in ... (d) Calculate the volume (in mL) of 0.1065 M Sr(OH)2 required to titrate 25.00 mL of 0.2465 M.

:

Explanation:

Answer:

Plants

Explanation:

Plants, part of the biosphere, grow in the soil, which is part of the geosphere

hope this helped :)

Answer:

66 grams of ice would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C.

Explanation:

To calculate the amount of ice that would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C, we need to use the formula:

Q = m_water * c_water * ΔT_water + m_ice * Lf

where,
Q = the amount of heat transferred,
m_water = the mass of water, c_water is the specific heat capacity of water,
ΔT_water = the change in temperature of water, m_ice = the mass of ice,
Lf = the specific latent heat of fusion of ice.

First, let's calculate the amount of heat transferred to the water:

Q = m_water * c_water * ΔT_water
Q = 352 g * 1.0 cal/(g*°C) * (15-0) °C
Q = 5,280 cal

Next, we can use the specific latent heat of fusion of ice, which is 80 cal/g, to calculate the amount of heat required to melt the ice:

Q = m_ice * Lf
Q = m_ice * 80 cal/g
m_ice = Q / Lf
m_ice = 5,280 cal / 80 cal/g
m_ice = 66 g

According to the given statement Na of the atoms listed below has the largest radius.

An atom is made up of a core nucleus and one or even more electrons with negative charges that orbit it. The positively charged, comparatively hefty protons and neutrons that make it up the nucleus may be present. The fundamental building components of matter are atoms.

Atoms are made up of a nucleus in the center that is surrounded by protons, neutrons, and electron. Uranium is divided into smaller atoms during the fission process, creating new atoms. The creation or atoms in enormous numbers can be seen in the Big Bang and Supernova phenomena.

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Answer:

Benzoic acid is a stronger acid than phenol because the benzoate ion is stabilised by two equivalent resonance structures in which the negative charge is present at the more electronegative oxygen atom. ... Thus, the benzoate ion is more stable than phenoxide ion. Hence, benzoic acid is a stronger acid than phenol.

The highest boiling point based on the data is option 4

Compared to alcohols of comparable molecular weight, carboxylic acids often have higher boiling temperatures. Between the hydrogen atoms of adjacent molecules and the oxygen in the carboxyl group of carboxylic acids, strong intermolecular hydrogen bonds can develop. Because it takes more energy to break the intermolecular interactions and change the substance from a liquid to a gas during boiling, these hydrogen bonds help materials have higher boiling temperatures.

Although carboxylic acids and alcohols are both capable of forming hydrogen bonds, carboxylic acids have higher boiling temperatures due to the extra carboxyl group that they contain.

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The correct options that apply during a chemical change are:

A) One atom or more changes into atoms of another element.

B) New substances with different properties are formed.

C) Solids, liquids, or gases may form. Option A, B and C

During a chemical change, the arrangement of atoms in molecules is altered, resulting in the formation of new substances with different chemical properties. This is represented by option B. For example, when hydrogen gas (H₂) reacts with oxygen gas (O₂), a chemical change occurs, and water (H₂O) is formed. The properties of water, such as boiling point, density, and chemical reactivity, are distinct from those of its constituent elements.

Additionally, during a chemical change, atoms can rearrange to form molecules of different elements, as indicated in option A. For instance, during a nuclear reaction, such as radioactive decay, the nucleus of an atom can change, leading to the formation of atoms of different elements.

Option C is also correct. Depending on the specific reaction conditions, chemical changes can result in the formation of solids, liquids, or gases. For example, when a metal reacts with an acid, such as zinc with hydrochloric acid, a gas (hydrogen) is produced.

Options D and E are not universally applicable to all chemical changes. While some reactions may release heat energy (exothermic reactions), others may absorb heat energy (endothermic reactions). The requirement for heating or the release of heat depends on the specific reaction and its energy considerations.

In summary, during a chemical change, atoms can change into atoms of another element (A), new substances with different properties are formed (B), and solids, liquids, or gases may form (C).

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Here it is, you know... Googling helps :)

The Lewis structure of SeO₃ is attached to the image below.

Selenium (Se) is in Group 16 of the periodic table, so it has 6 valence electrons. Oxygen (O) is in Group 16 as well, so each oxygen atom contributes 6 valence electrons. Since there are three oxygen atoms, the total number of valence electrons is:

6 (valence electrons of Se) + 6 (valence electrons of each O) 3 (number of O atoms)

= 6 + 18 = 24

The central atom in SeO3 is selenium (Se) since it is less electronegative than oxygen and can accommodate more than two bonded atoms.

Place the selenium atom in the center and connect it to each oxygen atom using a single bond. Each bond consists of two electrons.

Subtract the number of electrons used in step 3 from the total number of valence electrons: 24 (total valence electrons) - 6 (bonds) = 18

Distribute the remaining 18 electrons around the atoms to satisfy the octet rule.

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Answer:

I would go with

B. Surface water at the poles is dense because of low temperatures and high salinity.

i could be wrong tho.

Explanation:

Answer:

The amswer would be A due to the ratio between ethane and carbon dioxide being 1:2. Due to this, you double the moles that are reacting

Answer:

Percentage of oxygen = 73%

Explanation:

Given data:

Percentage of C in CO₂ = 27%

Percentage of O₂ in CO₂ = ?

Solution:

The percentage of carbon in carbondioxide is 27% then the percentage of oxygen will be calculated by subtracting the percentage of carbon from 100.

Percentage of oxygen = 100 - percentage of carbon

Percentage of oxygen = 100-27

Percentage of oxygen = 73%

4 in hydrogen 4 in oxygen

Explanation:

hope this helps

Answer:

345

Explanation:

Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. ... This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.

Answer:

Protons, neutrons, and electrons

Explanation:

protons- a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

neutrons- a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

electrons- a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Answer:

3.54 L

Explanation:

To find the new volume, we'll use this formula: \(\frac{V_1}{T_1} = \frac{V_2}{T_2}\)

V₁ = Liters (5.6)

T₁ = Volume in kelvin (273 + 35 = 308)

V₂ = New liters (?)

T₂ = New temperature (273 - 78 = 195)

\(\frac{5.6}{308} = \frac{V_2}{195}\)

First, cross multiply

1092 = V₂308

Divide both sides by 308

1092/308 = V₂308/308

V₂ = 3.54