If an automobile travels 215 mi with a gas mileage of 20.5 mi/gal , how many kilograms of co2 are produced? assume that the gasoline is composed of octane, c8h18(l), whose density is 0.69 g/ml.

The answer is

C) Two liquids that are not mixable are mixed in emulsion.

i did the test so its right

Answer: There are eight protons.

Explanation:

Mass number is the sum of total number of protons and neutrons present in the nucleus of an atom.

On the other hand, atomic number is only the total number of protons present in an atom.

Also, when an atom is electrically neutral in nature then its number of protons equal to the number of electrons present in it.

An electrically neutral atom of oxygen has 8 electrons and 8 protons. It can have any number of neutrons depending on the isotope of oxygen.

Thus, we can conclude that an electrically neutral atom of oxygen that has eight electrons will also have 8 protons.

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the given electronic configuration  [Ne]3s²3p⁵ belongs to group 17 of periodic table.

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.

The systematic distribution of electrons in the various atomic orbitals is called its electronic configuration. The given electronic configuration is [Ne]3s²3p⁵ . 1,2,3 represents the number of shells and s and represents the orbitals. The superscripts represents the number of electrons in each orbitals. There are total 7 electrons in the outermost shell of the electronic configuration, which shows the group 17 of periodic table.

Therefore, the given electronic configuration  [Ne]3s²3p⁵ belongs to group 17 of periodic table.

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The given values in the problem are:

 .725 M is moles per liter 

300 mL = .300 L 

The solution is:

56.1 g/mol in 300 ml = 56.1g/mol in .3L 

M = (x gram/56.1) /.3L 

.725 = (x gram/56.1)/.3L 

Multiply both sides by .3

.2175 = x grams/56.1 

x = 12.20 g

To make a 0.725mol solution with a volume of 300ml, you need approximately 12.2g of KOH, calculated using the definitions of molality and molar mass.

To answer this question, we will use the definition of molality. Molality (m) is defined as the number of moles of solute per kilogram of solvent. It is given that the molality is 0.725m and the volume is 300.0 ml. Firstly, convert volume to mass. Since the density of water is approximately 1 g/ml, 300.0 ml is approximately 300.0 grams or 0.300 kg. Multiply this by the given molality, 0.725 mol/Kg, to obtain the number of moles of KOH, which is 0.2175 moles.

Now, we need to find the mass of KOH. The molar mass of KOH (K=39.1, O=16, H=1) is approximately 56.1g/mol. Multiply this by the number of moles (0.2175) and you obtain the mass of KOH required, approximately 12.2g.

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Lithium (Li) will react with water to produce Lithium Hydroxide (LiOH) and hydrogen gas (H2). Magnesium and Aluminum may react under certain conditions, but not readily at room temperature; Lead (Pb) does not react with water.

Among the metals listed – Mg (Magnesium), Li (Lithium), Al (Aluminum), and Pb (Lead) – Lithium (Li) will react with water to produce a metal hydroxide and hydrogen gas. When Lithium reacts with water, it forms Lithium Hydroxide (LiOH) and releases hydrogen gas (H2).

Here is the chemical equation for the reaction of Lithium with water:

2 Li (s) + 2 H2O (l) → 2 LiOH (aq) + H2 (g)

Magnesium (Mg) and Aluminum (Al) can also react with water, but usually when they are in the form of powder or at high temperatures, and in the case of Aluminum, it often has an oxide layer that inhibits its reaction with water under normal conditions. Lead (Pb) is not reactive with water under normal conditions.

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Energy cannot be created or destroyed, but can only change forms according to the law of conservation of energy. The total amount of energy in a closed system remains constant, even though it may convert to different forms such as kinetic or potential energy.

According to the law of conservation of energy, in any process, the total energy of the universe, or any closed system, remains constant. This means that energy cannot be created or destroyed; instead, it can only be transformed from one form to another. For instance, in a closed system, energy may shift between kinetic energy, potential energy, thermal energy, and various other forms, but the total amount of energy within that system does not change.

Consider the example of a roller coaster. As the coaster climbs a hill, it is converting the kinetic energy from the speed it has into potential energy due to its height. When the coaster comes down the hill, that potential energy is converted back into kinetic energy. Throughout these changes, the overall energy within the coaster system remains the same, illustrating the conservation of energy in a practical scenario.

It is also important to note that energy conversions are not 100% efficient, and some energy is often lost as heat due to friction or other non-conservative forces. However, this energy is not lost from the system; rather, it changes form and still obeys the conservation of energy principle.

When it comes to valence electrons, the atoms of Silicon would have the most of the elements in the option.

Considering the atomic number of each of the elements:

Thus, one can see that Silicon has the highest number of valence electrons of all the elements. Hence, its atom would have the most valence electrons.

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Mixing food coloring with water is a physical change.

Physical changes are those that involve changes to the physical properties of materials without affecting the chemical properties.

When a food coloring is mixed with water, the water component of the mixture can be retrieved by evaporation and condensation while the food coloring will remain in the evaporating vessel.

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In the complete oxidation reaction for ethane (C2H6) burning in air, ethane reacts with oxygen to produce water and carbon dioxide. The balanced equation for the given reaction is: 2C2H6 + 7O2 -> 6H2O + 4CO2.

The question asks for a balanced equation for the complete oxidation reaction that occurs when ethane (C2H6) burns in air.

This represents the complete oxidation reaction of ethane. Note that the coefficients in the balanced equation are the smallest possible integers, as required by the question.

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2.3 moles CaCO₃

That is;

CaCO₃(s) → CaO(s) +CO₂(g)

From the question, 129 grams of CaO were formed

We are required to calculate the number of moles of CaO used.

This can be done in the following steps;

Step 1: Moles of CaO produced

The number of moles is calculated by dividing mass by the molar mass of a compound.

Molar mass of CaO is 56.0774 g/mol

Therefore;

Moles of CaO = 129 g ÷ 56.0774 g/mol

                       = 2.3 moles

Step 2: Moles of CaCO₃ decomposed

From the equation 1 mole of CaCO₃ decomposes to yield 1 mole of CaO

Therefore;

For 2.3 moles of CaO to be produced then 2.3 moles of CaCO₃ would be decomposed.

Therefore;

The moles of CaCO₃ decomposed is 2.3 moles

To produce 129 grams of CaO, 2.304 moles of CaCO₃ need to be decomposed.

This is calculated using the molar masses of CaCO₃ and CaO based on the balanced chemical equation.

To determine how many moles of CaCO₃ need to be decomposed to produce 129 grams of CaO, follow these steps:

Therefore, 2.304 moles of CaCO₃ must be decomposed to produce 129 grams of CaO.

Correct question is: How many moles of CaCO₃ would have to be decomposed to produce 129 grams of CaO ?

Answer:

-gas particles behave like hard spheres

-gas particles travel randomly

-average kinetic energy of a collection of gas particles depends on the temperature

answers on edg

Explanation:

Answer  1, 2, & 5

Explanation:

An ion of magnesium has 12 protons and a charge of +2. The number of electrons in these ions are 12.

Electrons are negatively charged ions that are present around the nucleus of the atom. There are many electrons in one atom of the element. They revolve around the negatively charged nucleus.

Here, an ion of magnesium is given, that has 12 protons and a charge of 2+.  To count the number of electrons, we can count the number of protons. The protons are equal to the number of electrons. Magnesium is an alkaline earth metal whose atomic number is 12.

Protons = electrons(12 electrons).

However, it has a charge of +2 which means it loses two electrons, thus, there are 10 electrons.

Thus, the number of electrons in these ions is 12.

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A substance in a solid phase is relatively rigid, has a definite volume and shape.

the answer is d because Solid substances have the lowest degree of freedom and the highest attractive and intermolecular forces between the molecules.

The texts provided discuss osmolarity, which impacts the volume of a cell by influencing water movement across membranes, and is related to tonicity, hypotonic, isotonic, and hypertonic solutions.

The given information pertains to osmolarity, which is the total solute concentration of a solution and is often associated with the tonicity of a solution. Osmolarity has a direct impact on the movement of water across a semipermeable membrane, where water moves from a lower osmolarity side (where there is more water) to a higher osmolarity side (where there is less water), following its concentration gradient. This process is vital for understanding how hypotonic, isotonic, and hypertonic solutions affect the volume of cells. Viscosity, while not discussed in detail here, is a property of fluids that describes resistance to flow and is determined by intermolecular forces.

Answer:

solubility increases

Explanation:

The mass of silver metal produced when 6.35 g of copper reacts with excess silver nitrate is calculated to be 21.548 grams following a stoichiometric conversion process.

To calculate the mass of silver metal produced from the given mass of copper, we need to reference the balanced chemical equation for the reaction between copper and silver nitrate:

Cu (s) + 2AgNO3 (aq) → Cu(NO3)2 (aq) + 2Ag (s)

From the equation, we see that each mole of copper produces two moles of silver. We can conduct a series of conversions to find the mass of silver using the molar masses of copper (63.546 g/mol) and silver (107.868 g/mol).

Firstly, calculate the number of moles of copper:

moles of Cu = mass of Cu / molar mass of Cu

= 6.35 g / 63.546 g/mol

= 0.0999 mol

Then, using the stoichiometry of the reaction, calculate the moles of silver produced:

moles of Ag = 2 × moles of Cu

= 2 × 0.0999 mol

= 0.1998 mol

Finally, convert the moles of silver to mass:

mass of Ag = moles of Ag × molar mass of Ag

= 0.1998 mol × 107.868 g/mol

= 21.548 g

The mass of silver metal produced from the reaction is therefore 21.548 grams.

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Sodium chloride is found in underground deposits as a solid due to its stable ionic lattice structure. These deposits, often mined, are remnants of evaporated ancient seas. NaCl's unreactive nature contrasts with the reactivity of its constituent elements, sodium and chlorine.

You would expect to find sodium chloride, commonly known as table salt or by its geological names rock-salt or halite, in underground rock deposits as a solid. Sodium chloride is an ionic compound consisting of sodium ions ([tex]Na^+[/tex]) and chloride ions ([tex]Cl^-[/tex]), which form a crystalline lattice structure that is stable at room temperature and under the earth's surface where the temperature and pressure conditions typically do not allow it to exist as a liquid or a gas. Underground deposits of sodium chloride are a result of the evaporation of ancient seas, leaving behind salt that has since been buried and can be mined. These salts can reach solubility limits in water of 36-39 g per 100 mL, leading to the formation of natural salt deposits.

The stability of sodium chloride arises from the strong ionic bonds between sodium and chloride ions. In contrast, its constituent elements, sodium and chlorine, are highly reactive - sodium is so reactive it must be stored under oil and chlorine is a poisonous gas. However, when they come together to form NaCl, they achieve a stable structure with full outer electron shells, resulting in a substance that is largely unreactive and doesn't undergo explosive reactions like its individual elements.