True/False. A characteristic of a good cardiac biomarker is that it is normally present in a HIGH concentration in the peripheral blood.

Answer:

A. An indicator added to the solution turns green-blue.

Explanation:

A pH scale measures the concentration of hydrogen ions in acidic and alkaline solutions.

In chemistry, pH literally means the power of hydrogen ions and it is a measure of the molar concentration of hydrogen ions in a particular solution; thus, specifying the acidity, neutrality or basicity of any chemical solution.

Mathematically, the pH of a solution is given by the formula;

\( pH = -log_{10}(H^{+}) \)

On a pH scale, a solution with a pH of 7 is neutral, a solution with a pH below 7 is acidic and it's basic (alkaline) when it's pH is above 7.

A pH indicator can be defined as a compound (substance) that indicates the concentration of hydrogen ions present in a solution by changing its color over a narrow range of pH values.

A pH range of 1 to 3 (1 - 3) represents a strong acid with a red color.

When an indicator added to a solution turns green-blue, it simply means that a weak base is present.

Explanation and Answer:

When trying to find the mass of a substance from the mass of another substance using a chemical equation we have to follow some steps.

Before starting solving the problem we have to make sure that we have a balanced equation of the reaction. The steps are:

1. Make sure that we are working with a balanced chemical equation.

2. Convert the mass of the given compound to moles using its molar mass.

3. Convert the moles of the given compound into moles of the target compound using their molar ratio. Their molar ratio will be given by the relationship of their coefficients in the equation of the reaction.

4. Convert the moles of the target compound into grams using its molar mass.

The Balanced equation is:

\(NO_3^- (aq) + 2Zn (s) \rightarrow Zn^2^+ (aq) + 3NO (g)\)

A balanced equation is a chemical reaction in which the overall charge and the number of atoms for each component are exactly equal for both the products and the reactants. In simple words, the mass and charge of each side of the reaction process are equal.

One may balance equations by adhering to some basic guidelines:

1. Verify that all of the equation's formulas are accurate.

2. Focus on just one component at a time.

3. Balancing requires big number addition. A chemical formula cannot have any little numbers changed. If there has to be any balance, place the number before the substance.

4. Recheck each component and repeat step 3 if necessary.

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The question requires us to calculate the amount of vapor water produced as a by-product when 66g of carbon dioxide are obtained from the combustion of propane.

Considering the combustion of propane (C3H8), we have the following reaction:

IFrom the reaction, we can see that the stoichiometric relationship between C3H8 and water (H2O) is as follows:

2 mol C3H8 ---------- 8 mol H2O

Then, to calculate the amount of water produced as a by-product, we'll need to determine the amount of reactant needed to produce 66g of CO2.

Since the molar mass of CO2 is 44g/mol and considering the reaction written above, we can write:

2 mol C3H8 ---------- 4 mol CO2

x ---------- (66g/44g) = 1.5 mol CO2

Solving for x, we have that 0.75 mol of C3H8 are required to produce 66g of CO2.

Now, we calculate the amount of water that should be obtained from 0.75 mol of C3H8:

2 mol C3H8 ---------- 8 mol H2O

0.75 mol C3H8 ----- y

Solving for y, we have that 3 moles of water will be obtained as a by-product.

At last, we convert the calculated amount of vapor water into its volume considering the Standard Temperature and Pressure conditions (STP), where 1 mol of a gas corresponds to 22.4 L of the same gas:

1 mol vapor H2O ---------- 22.4 L vapor H2O

3 mol vapor H2O --------- z

Solving for z, we have that 67.2 L of vapor water will be obtained as a by-product when 66g of CO2 are produced from the combustion of propane.

at the given temperature, HI will decompose into H2 and I2.

Given that the following reaction has an equilibrium constant value of

K = 46 at 783K: H2 (g) + l2 (g) = HI (g).

Initial pressures were given to be 55kPa for both hydrogen and iodine and 78kPa for hydrogen iodide which is at equilibrium. In this problem, Qp is the reaction quotient for pressures at the given instant. Qp has the same expression as Kp, but with initial pressures instead of equilibrium pressures.

Qp = p(HI) / [p(H2) . p(I2)] = 78 / [55 . 55] = 0.0241

K is the equilibrium constant and Q is the reaction quotient.Q is less than K. This implies that the reaction quotient will increase to match the equilibrium constant.

As a result, the reaction will shift forward to produce more HI. Thus, at the given temperature, HI will decompose into H2 and I2.

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Answer:

Mostly Metals, But hydrogen is the only one that isn't.

Answer:

increase

Explanation:

Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction. Conductors include metal, steel, aluminum, copper, frying pan, pot, spoon etc.

In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.

Hence, thermal energy added to a substance that is not changing state causes the substance’s temperature to increase because it would absorb energy in the form of heat.

A real gas behaves least like an ideal gas under the conditions of low temperature and high pressure.

This is because at low temperature and high pressure molecules of gas will have negligible kinetic energy and strong force of attraction. Thus, real gas will not behave like an ideal gas.

Whereas at high temperature and low pressure a real gas will behave like an ideal gas.

Answer: No real gas is ideal. All molecules have a volume and intermolecular forces of attraction. So a "real molar volume" is different from an ideal molar volume.

Explanation: I hope this help

Answer:

D

Explanation:

Answer: the answer is molecules

A molecule is the smallest particle of a covalent compound that still has the properties of the compound.

Answer:

begin to move

Explanation:

When electric charges begin to move, this is when magnetism takes place.

Hope this helped!

Answer:

I am confident that it is the last answer but if you can find a more verified answer I would go for that.

Answer:

It can be formed either through a process of evaporation or sublimation. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form

Explanation:

hope it help

Answer:

No. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form

Answer:

A.) A rubber boot does not conduct electricity well, so it is in the wrong group.

Explanation:

A glass coffee cup conducts electricity well when it is heated

Answer:

i think the answer is a rubber boot if i am correct

Explanation:

The ratio of octene to oxygen is 1:12.

To determine the ratio of octene (C8H16) to oxygen (O2) in the given reaction, we need to examine the balanced chemical equation. However, the equation you provided does not seem to be balanced. The coefficients for each compound must be determined to achieve a balanced equation before we can calculate the desired ratio.

Assuming you meant the combustion reaction of octene, a balanced equation would be:

C8H16 + 12O2 → 8CO2 + 8H2O

From the balanced equation, we can see that for every 1 mole of octene (C8H16), we require 12 moles of oxygen (O2) to completely react.

This means that for every 1 mole of octene, we need 12 moles of oxygen to fully combust the octene and produce the corresponding amounts of carbon dioxide (CO2) and water (H2O) as shown in the balanced equation.

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To obtain the density of her rocks, Wendy had to take measurements of mass and volume of the rocks.

Density is defined as mass per unit volume. Wendy wanted to obtain the density of the rocks hence she had to measure the mass and the volume of the rock.

The mass of the rocks is measured using a weighing balance while the volume of the rocks is obtained by water displacement method.

The density is now obtained as;

Density = Mass/volume  for each rock sample.

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Due to electronegativity difference between H and F atom.

Thus from the above conclusion we can say the difference in electronegativity between H and F atom this is the reason for shorter bond length of HF.

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To determine if it was safe for Kacy to clean up the mess, we need to know the concentration of the hydrochloric acid solution and the stoichiometry of the reaction between hydrochloric acid and sodium bicarbonate.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium bicarbonate (NaHCO3) is:

HCl + NaHCO3 -> NaCl + CO2 + H2O

From the balanced equation, we can see that one mole of HCl reacts with one mole of NaHCO3 to produce one mole of NaCl, one mole of CO2, and one mole of H2O.

Therefore, we need to know the concentration of the hydrochloric acid solution (in units of moles per liter) to determine the number of moles of HCl in the solution. We also need to know the amount of sodium bicarbonate in grams and convert it to moles to determine the limiting reagent in the reaction.

Once we have this information, we can calculate the amount of product (NaCl) formed and determine if it was safe for Kacy to clean up the mess based on any potential hazards posed by the reaction.

Answer:

A) The solubility of NH3 increases, and the

solubility of KCl increases.

Explanation:

The solubility of ammonia and potassium chloride increases with decrease in temperature from 40°C to 20°C.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom. In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it.

Explanation:

The following functional groups contains a carbonyl group is:

e. All of the functional groups listed contain a carbonyl group.

Explain why they contain a carbonyl group:

a. Ketone:

Ketones are organic compounds characterized by the presence of a carbonyl group (-C=O) bonded to two carbon atoms. The carbonyl group consists of a carbon atom double-bonded to an oxygen atom. The remaining two bonds of the carbonyl carbon are typically occupied by alkyl or aryl groups. The general formula for a ketone is R-C(=O)-R', where R and R' represent alkyl or aryl groups. The carbonyl group is an essential feature of ketones, enabling them to exhibit unique chemical reactivity and properties.

b. Ester:

Esters are organic compounds containing a carbonyl group (-C=O) bonded to an oxygen atom and a carbon atom. The oxygen atom of the carbonyl group is also bonded to another carbon atom, referred to as the alkyl or aryl group. Esters have the general formula R'-C(=O)-O-R, where R' represents an alkyl or aryl group. The carbonyl group in esters allows for characteristic reactions, such as hydrolysis and esterification, and contributes to their distinctive odour and flavour.

c. Carboxylic acid:

Carboxylic acids are organic compounds that contain a carboxyl group, which consists of a carbonyl group (-C=O) bonded to a hydroxyl group (-OH). The carbonyl carbon is double-bonded to the oxygen atom, and the oxygen atom is single-bonded to the hydroxyl group. The general formula for a carboxylic acid is R-C(=O)-OH, where R represents an alkyl or aryl group. The carbonyl group in carboxylic acids gives them acidic properties and influences their chemical behavior.

d. Amide:

Amides are organic compounds containing a carbonyl group (-C=O) bonded to a nitrogen atom. The nitrogen atom can be part of an alkyl or aryl group or part of an amine functional group. The general formula for an amide is R-C(=O)-NR₂, where R represents an alkyl or aryl group and R₂ represents alkyl or aryl groups or hydrogen atoms. The carbonyl group in amides plays a crucial role in their reactivity and is responsible for their involvement in various biological processes.

Therefore, all of the functional groups listed contain a carbonyl group.

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C₂H₆, compound has a C-H bond with the lowest bond dissociation energy, hence option A is correct.

Toluene has the lowest bond dissociation energy because it undergoes hyper conjugation with the C-H protons.

The energy needed to break a bond and create two atomic or molecular fragments, each containing one of the original shared pair of electrons, is known as the bond dissociation energy.

As a result, an extremely stable bond has a high bond dissociation energy, meaning additional energy is required to break the binding.

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In the solution water is solute and ethanol is solvent.

Binary solution

A mixture of two liquids that are completely miscible one with another is known as a Binary solution. The boiling point of binary solution depends upon the composition of the solution.

A binary solution consists of a solute and a solvent.

The solute is usually present in smaller quantity and solvent is in larger quantity.

If a solution has 70 ml ( larger quantity ) of ethanol , it means ethanol is the solvent .

water with 30 ml of quantity ( smaller quantity ) will be the solute.

So , in the mixture, water is the solute.

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Answer:

Grand Tourer  Injection

Answer:

Energy is absorbed in the given reaction because the reaction involves the breaking of bond which always involves the input of energy, i.e. bond-breaking is an exothermic reaction reaction.

Explanation:

Atoms of elements existing alone possess internal energies. When these atoms come together in bonding relationships as molecules or compounds, they lose or release their internal energy as heat in order to attain more stable state. Therefore, the bonded atoms in the molecules or compounds now possess lower energies than they possess as individual atoms.

In order for the bonds binding the atoms in the molecules or compound to be broken, an equal amount of energy to that released during bond formation is required. This energy is known as bond energy.

In the balanced equation of chemical reaction given below:

O₂(g) + energy ----> O(g) + O(g)

An oxygen molecule is broken down into two oxygen atoms. The process involves a breaking of the covalent bond holding the two atoms of oxygen together in the molecule of oxygen in order to release them as free atoms. Therefore, energy must be supplied or absorbed to break these bonds.

A mixture’s components can be separated by the technique of Chromatography.

It is widely used in various fields including forensics, chemistry, biology, and medicine. Chromatography works by taking advantage of different components within a sample and utilizing the differences in their behavior, such as their interactions with a chromatography column.

The most common type of chromatography is based on the principle of selective adsorption, in which components of the mixture bind to the stationary phase material, and move at different speeds when a mobile phase is added. The technique works by allowing components to separate based on their individual interactions with the surfaces of the chromatography column.

In general, chromatography is a useful technique for analyzing mixtures of organic compounds in a sample. This is done by separating the compounds in order of their relative solubility in different solvents. The solubility of each solvent is used to select proper temperatures for the chromatography process.

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Answer:

Different materials have different densities. So it is False

Answer:

The answer is False

Answer:

i really dont know but if you had answer choices it would be easier my guess is x^3 y^2

Explanation: