A sealed can of soda contain a pressure of 1.15 atm at 23°C. What is the new pressure at 79 °C? Report your answer to the hundredths place (two decimal places) You do NOT need units in your answer

Answer:

by watching and writing down the information that is provided

Explanation:

The amount of heat released when 75 g of CH4O reacts is -1705.64 kJ.

The equation given is the balanced equation for the combustion of methanol (CH4O) with oxygen to form carbon dioxide (CO2) and water (H20). The value of ΔΗ given (-726 kJ) is the enthalpy change for the reaction, which represents the amount of heat released or absorbed when the reaction occurs.

To calculate the amount of heat released when 75 g of CH4O reacts, we need to use the equation: q = n x ΔΗ where,

We know that the molar mass of CH4O is 32.04 g/mol, so we can convert 75 g to moles using the following formula: n = m/M where,

So, n = 75 / 32.04 = 2.34 moles

Using this value of n in the equation above, we can calculate the heat released as q = 2.34 x -726 = -1705.64 kJ

Therefore, -1705.64 kJ of heat is released when 75 g of CH4O reacts.

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The concentration of a solution that is prepared by dissolving 15 mg of NaCl in 200 mL water is 75 ppm. So, the correct option is a.

To calculate the concentration in parts per million (ppm), we need to determine the amount of NaCl dissolved in the solution and then convert it to ppm.

Mass of NaCl = 15 mg

Volume of solution = 200 mL

First, we need to convert the volume from milliliters (mL) to liters (L):

Volume of solution = 200 mL = 200/1000 L = 0.2 L

Next, we can calculate the concentration of NaCl in mg/L:

Concentration (mg/L) = (mass of solute in mg) / (volume of solution in L)

Concentration (mg/L) = 15 mg / 0.2 L = 75 mg/L

Finally, we can convert the concentration from mg/L to ppm:

Concentration (ppm) = Concentration (mg/L) = 75 ppm

Therefore, the concentration of the NaCl solution is 75 ppm, which corresponds to option (a).

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For the 4 g of hydrogen, only 32 g of Oxygen is required to react completely.

Hydrogen is described as the chemical element with the symbol H and atomic number 1. Hydrogen is known as the lightest element. At standard conditions hydrogen is also known to be a gas of diatomic molecules having the formula H₂.

Hydrogen has some properties which includes : It is colorless, odorless, tasteless, non-toxic, and highly combustible.

From the equation, Molecular mass of H2 = 2g/mol

Molecular mass of O2 = 32g/mol

From  the balanced chemical equation,

2H +O 2 →2H 2O

2×2=4 g of hydrogen requires 32 g of Oxygen to react completely.

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Answer:

Mass is used to measure the weight of an object. For example, you are measuring the mass of your body when you step on to a scale. In the metric system of measurement, the most common units of mass are the gram and kilogram.

Explanation:

Answer:

true

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Using MO theory, we predict that 1 and 3 (CN and CN2) are diamagnetic, while 2 (CN+) is paramagnetic. Therefore, the correct answer is a. 1 and 3 only.

Using MO theory, we can predict the magnetic properties of molecules based on the electron configuration of their molecular orbitals. Diamagnetic species have all of their electrons paired, while paramagnetic species have unpaired electrons.
For CN, we can draw the MO diagram by combining the atomic orbitals of carbon and nitrogen. The diagram shows that CN has 10 electrons in its molecular orbitals, with all of them paired. Therefore, CN is diamagnetic.
For CN+, we can remove one electron from CN and recalculate the MO diagram. The resulting diagram shows that CN+ has 9 electrons, with one unpaired electron in the highest energy molecular orbital. Therefore, CN+ is paramagnetic.
For CN2, we can combine two CN molecules and draw the MO diagram. The diagram shows that CN2 has 20 electrons in its molecular orbitals, with all of them paired. Therefore, CN2 is also diamagnetic.

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Sodium borohydride can reduce aldehydes and ketones.

Sodium borohydride is a versatile reducing agent commonly used in organic chemistry. It has the ability to selectively reduce certain functional groups, particularly aldehydes and ketones.

When sodium borohydride reacts with an aldehyde or ketone, it donates a hydride ion (H-) to the carbonyl carbon, resulting in the formation of a corresponding alcohol. This reduction process is an important tool in synthetic chemistry for the preparation of alcohols.

The reduction by sodium borohydride, it is important to understand the reactivity of carbonyl compounds. Aldehydes and ketones possess a polarized carbonyl group, which makes them susceptible to nucleophilic attack. Sodium borohydride acts as a source of hydride ions, which are strong nucleophiles.

The hydride ion donates its electrons to the carbonyl carbon, leading to the formation of an alkoxide intermediate. Subsequently, the alkoxide picks up a proton from the surrounding medium, resulting in the formation of the corresponding alcohol.

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Answer:

b- 232%

Explanation:

Renewable energy consumption by energy source in 2006 = 6.659 quadrillion Btu

Renewable energy consumption by energy source in 2010 = 8.049 quadrillion Btu.

In 2006, wind energy = 4%

∴ wind energy = 4% x 6.659 = 0.26636

In 2010, wind energy = 11%

∴ wind energy = 11% x 8.049 = 0.88539

∴ Percent increase = (final number - initial number) ÷ (initial number) x 100

% increase = [(0.88539 - 0.26636) ÷ 0.26636} x 100 = 232.4035% ≈ 232%.

Answer = 232%.

In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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Answer:

energy flow and nutrient cycles ( photosynthesis , food webs, decomposition webs) sediment transport and soil formation. the water cycle. reproduction/ regeneration mechanisms.

The chemical formula for aluminum sulfate is Al₂(SO₄)₃.

Aluminum sulphate is a salt composed of the elements  Aluminum, sulphate and oxygen. It is white in color and becomes colorless on hydrolysis.

Aluminum sulphate is commonly used for purification of water, as a mordant in cloth dyeing and printing. It allows the suspended impurities present in water to coagulate by which they can quickly settle at the bottom of the container.

Aluminum sulphate forms a gelatinous precipitate of aluminum hydroxide, (Al(OH)₃), when it is immersed in a large volume slightly alkaline or neutral water. The gelatinous precipitate thus formed aids in the adhesion of dyes to clothing fabrics.

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Oil spills on land and in the dirt have the potential to damage plant and animal life as well as contaminate the environment.

Contamination is defined as a substance, physical body, natural environment, workplace, or any other object that is spoiled, corrupted, infected, unsuited, or inferior due to the existence of a constituent, impurity, or other unwanted ingredient.

Since they can spread hundreds of nautical miles in a thin oil slick that can blanket beaches with a thin layer of oil, oil spills at sea are typically significantly more harmful than those on land. These are capable of killing shellfish, seabirds, mammals, and other species they coat.

Thus, oil spills on land and in the dirt have the potential to damage plant and animal life as well as contaminate the environment.

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The percentage of the compound is potassium is 22.53 %.

given that :

compound contains percentage of chromium = 39.37 %

compound contains percentage of oxygen = 38.10 &

compound contains percentage of potassium = ?

compound contains percentage of potassium = - 100%

                                         (percentage of chromium +  percent of  oxygen )

                                                  = 100 % - (39.37 % + 38.10 %)

                                                  = 100 % - 77.47 %

                                                  = 22.53 %

The percent of potassium in total percent of compound is 22.5 %.

Thus, a compound contains 39.37% chromium, 38.10% oxygen, and potassium. percentage of the compound is potassium is 22.53 %.

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Plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.

Plasmas is defined as a type of substance in which numerous electrons freely roam around the nuclei of the atoms.

Plasma has been referred to as the fourth state of matter, alongside solid, liquid, and gas.

When one or more electrons are ripped from an atom, they form a plasma.

Thus, plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.

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Expect to exist in higher concentration in an ionic ceramic: we would NOT expect defects for anions to exist in an ionic ceramic

We are aware that a Frenkel defect must contain an anion-interstitial pair and a vacancy pair, in this case an anion-vacancy pair. Yet, since the anion is rather massive and cannot fit into the interstitial site, the likelihood of anion-interstitial production is very low.

As a result, we could not anticipate the existence of Frenkel defects for anions in ionic ceramics at rather high concentrations. We did not anticipate the presence of Frenkel defects for anions in ionic ceramics at concentrations that are significant.

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To find the empirical formula of the compound, you need to find the ratio of the elements present in the smallest whole numbers. You can do this by dividing each element's mass by its atomic mass and then dividing the result by the smallest ratio found.

For example:

Mercury (Hg) atomic mass = 200.59 g/mol

Oxygen (O) atomic mass = 15.999 g/mol

Hg mass = 20.3 g / 200.59 g/mol = 0.101 mol

O mass = 1.70 g / 15.999 g/mol = 0.106 mol

Dividing the two mole ratios by the smaller ratio (0.106), we get:

Hg = 0.101 / 0.106 = 0.95 (rounded to 1)

O = 0.106 / 0.106 = 1.0

So, the empirical formula of the compound is HgO.

Answer:

HgO

Explanation:

The highest energy molecular process that occurs when a molecule absorbs a visible photon is electronic excitation.

The highest energy molecular process that occurs when a molecule absorbs a visible photon is electronic excitation. This occurs when the photon is absorbed by an electron within the molecule, causing it to move to a higher energy level. This can result in the molecule becoming ionized or excited, which can lead to further chemical reactions. Other processes such as molecular vibration, rotation, and bond breakage can also occur, but these typically have lower energy levels than electronic excitation.

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If a clear solution is treated with hydrochloric acid and a green solution or green coloration appears, it indicates the presence of copper in the solution. This is because copper ions react with hydrochloric acid to form a green solution of copper(II) chloride.

On the other hand, silver ions will not react with hydrochloric acid and therefore, the absence of any color change indicates that silver is not in the solution. It is important to note that this is just one of many tests that can be performed to identify and separate metals in a complex mixture, and it requires careful consideration and analysis of the specific properties of each metal in the mixture.

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Option C) RbOH, HBr cannot be mixed together to form a buffer solution is Correct. A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it.

The ability of a solution to resist changes in pH is determined by the concentrations of the weak acids and bases present in the solution, as well as the concentration of the strong acid or base that is added to the solution. The weak acids and bases present in a buffer solution react with the strong acid or base to form a salt and water. The salt and water react to neutralize the strong acid or base, maintaining the pH of the solution.

In the case of RbOH and HBr, the weak base, RbOH, and the weak acid, HBr, cannot react with each other to form a salt and water. Therefore, they cannot form a buffer solution. The other pairs of solutions can form a buffer solution if the concentrations of the weak acids and bases present in the solutions are appropriate and the strong acid or base is added in the appropriate concentration.

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Answer: 484.94 K

Explanation:

T2 = T1 X V2 / V1

Temperature must be in kelvin so 543 + 273.15 =816.15

816.15 X 51.1 / 86

Answer: We can use the combined gas law to solve this problem:

(P₁V₁/T₁) = (P₂V₂/T₂)

where P is pressure, V is volume, and T is temperature in Kelvin.

We know that P₁ = P₂ (the pressure is assumed to be constant), and we are given V₁, T₁, and V₂. We can solve for T₂:

(P₁V₁/T₁) = (P₂V₂/T₂)

T₂ = (P₂V₂/T₁) * (T₁/P₁V₁)

We need to convert the initial temperature from Celsius to Kelvin:

T₁ = 543 + 273 = 816 K

Substituting the values:

T₂ = (1 atm * 86 mL / 816 K) * (51.1 mL / 1 atm * 86 mL)

T₂ = 0.0629 * 51.1 * 1000 = 3217 K

Therefore, the marshmallow would need to be heated to a temperature of 3217 K for its volume to change from 86 mL to 51.1 mL.

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Answer:

Both b/c a chemical formula tells you how many and a sketch formula shows how they are bonded together.

Molecular formulas show how many atoms of each element one molecule of a compound contains. Note: Ionic compounds are generally crystalline solids with high melting points. Other compounds, however, have very different properties.

The sketch of the molecule like in the structural formula provides more information than the chemical formula of the molecule.

A structural formula can be described as a representation of a molecule that involves the arrangement of atoms and chemical bonds of a molecule. The structural formulas contain elemental symbols that represent the atoms that are connected by lines that represent the chemical bonds.

One line depicted a single covalent bond, whereas two and three lines represent double and triple bonds respectively. Molecular formulas can be described as a representation of the number of atoms of each element in a molecule.

For example, the molecular formula for water is H₂O and the molecular formula of isopentane is C₅H₁₀.

Molecular formulas do not show how the atoms of the elements are bonded together. Structural formulas represent that how exactly each atom is bonded to another atom. Therefore, the Structural formula provides more information about molecule.

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The portion of the cost of natural resources that is consumed in a particular period is called depletion expense.(option.a)

Depletion is a term used to represent the allocation of the cost of natural resources, such as coal mines, oil fields, and timber tracts, to the total amount extracted, sold, or used during a given period.

Depletion charges are usually recorded in the books of the company that owns the resource to reflect the decline in the value of the natural resources used in its operations.

It is a non-cash expense that affects the net income and cash flow of a company, and it is usually calculated by subtracting the residual value of the natural resources from the original cost and dividing by the estimated total units.

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Temperature and moisture levels of moving air masses would be most helpful for a meteorologist to track in order to most accurately predict changes in weather. Therefore, the correct option is option A.

Weather describes the condition of the atmosphere, such as how hot or cold it is, how wet or dry it is, how quiet or stormy it is, and how clear or foggy it is. Most weather occurrences occur on Earth in the troposphere, or press down of the planetary system just beneath the stratosphere.

Temperature and moisture levels of moving air masses would be most helpful for a meteorologist to track in order to most accurately predict changes in weather.

Therefore, the correct option is option A.

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Answer:

Explanation:

Some substances are poor conductors because they do not possess freely moving ions but they conduct electricity in their aqeous solution beacuse their ions become free to move when dissolved in water. Common example of such substances is NaCl which is commnly called table salt

Answer:

Flowers play a crucial role in our lives; they have been used for generations to express the thoughts and feelings words cannot fully explain. Mother nature is the short term used to describe how nature gives life and nurture as a mother does for her children. As humans, we are part of mother nature's plan. We are also connected to plants and flowers, and some of the benefits have been passed to the next generation and will always be. We can control the air that we breathe, the aura around us, how we feel, and the things we attract in life. Other than only gifting your loved ones with flowers on special occasions, you can make the best and lasting impressions on your loved ones with a flower plant gift. This gesture shows that you understand how flowers are important in our life. To shed light on the importance of flowers in our life, here is a blog that will give five importance of flowers

Monomers and polymers

Most large biological molecules are polymers, long chains made up of repeating molecular subunits, or building blocks, called monomers.

The long chains formed by the process of polymerization are called monomers.

In biological macromolecules, polymerization is the chemical process through which relatively tiny and smaller molecules, known as monomers, unite to form a very big chainlike or network of molecules known as a polymer.  

These monomers undergo reactions with one another to form larger molecules known as polymers. The types of monomers in biological macromolecules include:

Each of these individual monomers is critical to the survival and evolution of life.

Therefore, we can conclude that the long chains formed by the process of polymerization are called monomers.

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