there are four branched isomers of hexane. draw bond-line structures of all four of its isomers.

Answer:

4 days.

To calculate half life divide original value by 2.

1.2 ÷ 2 = 0.6 grams

0.6 minutes was a half life of new isotope.

A radioisotope is an unstable form of chemical element date releases radiation is it breakdowns and becomes more stable so, radioisotopes may occur in nature or it will be made in a laboratory also.

Uses of radioisotopes:

It is used in cancer treatment, food irradiation, gauges and radiography.

The time required for half of something to undergo a process such is the time required for half of the items of radioactive substance to become disintegrated.

Half life is the time taken for the radioactive of a substance to phone to half its original values where is mean life is average lifetime of all the nuclei of a particular unstable atomic species.

Radioactive element has a half life of one hour this means that half of it will decay in one hour after another hour half of the remaining material will decay.

Half life of the new isotope is 1.2/2 = 0.6 minutes

0.6 minutes was a half life of new isotope.

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

The reaction between 3-phenylpropyne and D2 (deuterium) in the presence of Pd/C (palladium on carbon) is a catalytic hydrogenation reaction. In this reaction, the triple bond of 3-phenylpropyne is reduced to a single bond, resulting in the addition of two deuterium atoms.

The organic product of this reaction is 3-phenylpropane-d2. The triple bond between the carbon atoms in 3-phenylpropyne is converted into a single bond, and two deuterium atoms (D) replace two hydrogen atoms (H). The phenyl group (C6H5) remains intact. The deuterium atoms are isotopes of hydrogen, containing a neutron in their nuclei. Thus, the resulting product, 3-phenylpropane-d2, contains deuterium atoms instead of hydrogen atoms, while the overall structure of the molecule remains the same.

Overall, the reaction between 3-phenylpropyne and D2 in the presence of Pd/C leads to the formation of 3-phenylpropane-d2, where the triple bond is converted to a single bond and two deuterium atoms replace two hydrogen atoms.

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Answer:

Mass would be 14 amu

Explanation:

The mass of a block of ice that has the dimensions of 5cm height, 6cm long, and 10cm in width and a density of 30 grams / c m³ is 9000 g.

given that :

density = 30 g/ cm³

height of block = 5cm

length of block = 6cm

width of block = 10 cm

volume of the block is calculated by the following formula :

volume = length × width × height

volume = 6 cm × 10 cm × 5 cm

volume = 300 cm³

now, the density of the block is given by :

Density = mass / volume

mass = Density × volume

mass = 30 g/ cm³ × 300 cm³

mass = 9000 g

Thus, The mass of a block of ice that has the dimensions of 5cm height, 6cm long, and 10cm in width and a density of 30 grams / c m³ is 9000 g.

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The volume of the gas at 18.00 ∘C and 0.992 atm is 4.86 L.

To solve this problem, we will use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the initial temperature to Kelvin by adding 273.15. Therefore, the initial temperature is 287.35 K.

Next, we can calculate the number of moles of gas using the given information. We can rearrange the ideal gas law to solve for n: n = (PV)/(RT). Plugging in the values, we get:

n = (1.50 atm)(3.55 L) / [(0.08206 L·atm/mol·K) (287.35 K)] = 0.194 mol

Now we can use the ideal gas law again to find the final volume. We can rearrange the ideal gas law to solve for V:

V = (nRT)/P

First, we need to convert the final temperature to Kelvin by adding 273.15. Therefore, the final temperature is 291.15 K.

Plugging in the values, we get:

V = (0.194 mol)(0.08206 L·atm/mol·K)(291.15 K) / 0.992 atm = 4.86 L

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Answer:

uhm... i'm not sure lma.o

why does a white dwarf shrink?

Explanation:

Answer:

H2

Explanation:

Hydrogen gas isn't a compound but it is diatomic when found naturally hence the 2

Answer:

Arterioles

Explanation:

Arterioles

Answer:

Baking soda is also used with cold water to remove surface rust. (Hot water can corrode steel). It is also useful when mixed with warm water to clean tea and coffee stains from the inside of mugs. Baking soda also works to unclog a sink. Sprinkle a few teaspoons of baking soda down the drain and splash some white vinegar on top.

Explanation:

Sodium bicarbonate reduces stomach acid. It is used as an antacid to treat heartburn, indigestion, and upset stomach. Sodium bicarbonate is a very quick-acting antacid.

Answer:

4092 atoms of iron i am guessing

Explanation:

In the given coordination compound: \(\rm Na_2[Zn(OH)_4]\), the coordination number of the central metal ion (Zinc) is 4, and its charge is +2, respectively.

Coordination compounds are molecules that consist of a central metal ion or atom surrounded by a group of atoms or ions called ligands.

In the coordination compound \(\rm Na_2[Zn(OH)_4]\), the central metal ion is zinc (Zinc). To determine the coordination number of the central metal ion, we count the number of ligands directly bonded to it. In this compound, the zinc ion is surrounded by four hydroxide \(\rm (OH^-)\) ligands. Therefore, the coordination number of zinc in this compound is 4.

Now, let's determine the charge of the central metal ion. In this case, we have sodium ions \(\rm (Na^+)\)present in the compound. Since sodium is an alkali metal, it commonly forms a +1 charge.

To determine the charge on the zinc ion, we can consider the overall charge of the compound. Since there are two sodium ions \(\rm (Na^+)\) present, and each carries a +1 charge, the total positive charge from sodium is +2. To balance the overall charge, the charge on the zinc ion must be -2.

Therefore, the coordination number of the central metal ion (Zinc) is 4, and its charge is +2, in the given coordination compound: \(\rm Na_2[Zn(OH)_4]\).

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The given question is not correct. The correct and complete question is:

Give the coordination number and the charge of the central metal ion in the given coordination compound: \(\rm Na_2[Zn(OH)_4]\).

Explanation:

Iam sorry I don't know but why Iam messaging iss because when more people message it usually appears to more people so someone else will be able to help you:)

Answer:

d is the correct answer and and

According to Euclid's second postulate, a fundamental principle of Euclidean geometry, a line can be drawn to infinity in both directions. Therefore, the correct option is A.

This implies that a line has no end and can go on indefinitely. This indicates that a line is an endless, unobstructed straight path. This postulate, which serves as a cornerstone of Euclidean geometry, establishes the basic properties of lines.

Euclid's second postulate makes it possible to find geometric relationships, angles and figures in an infinite space by allowing lines to be extended indefinitely. It serves as the basis for many geometric constructions and proofs and has important implications for our understanding of the mathematical properties of lines and angles.

Therefore, the correct option is A.

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Answer:

2H2+ 02-->2H20

So 4H2 + 202-->4H20

so the answer is 4 water molecules.

Answer:

I believe it's the second one

Explanation:

The big bang theory and the theory of natural selection.

The theory of continental drift and the theory of sea floor spreading from the past contributed to today's plate tectonic theory. Therefore, option A is correct.

Continental drift is the theory that the Earth's continents have moved relative to one another over geologic time, giving the appearance of "drifting" across the ocean floor.

Plate tectonics caused continental drift over millions of years. Plate tectonics also explained how plate movement causes volcanoes and earthquakes, as well as how continent collisions create massive mountain ranges.

In the early twentieth century, a scientific theory known as continental drift was proposed to explain this migration of continents. That theory was initially dismissed, but it paved the way for another theory known as plate tectonics, which scientists now accept as an explanation for how the Earth's continents move.

Thus, option A is correct.

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Answer:

b

Explanation:

G is always positive when enthalpy increases and entropy decreases.

The temperature can be the deciding factor in spontaneity when the enthalpy and entropy terms have opposite signs: If ΔH is negative, and –TΔS positive, the reaction will be spontaneous at low temperatures (decreasing the magnitude of the entropy term).

Where ΔH is the enthalpy change (the heat of the reaction) and ΔS is the change in entropy. If the free energy is negative, we are looking at changes in enthalpy and entropy that favor the process and it occurs spontaneously.

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Answer: A

1.68 N

Explanation:

F = ma = 0.024(70.0) = 1.68 N

Coal burning is the result of London-type smoge (option C)

A serious case of air pollution known as the Great Smog of London, or Great Smog of 1952, struck London, England, in December 1952. The city was covered in a thick layer of smog due to an extended period of exceptionally cold weather, an anticyclone, and windless circumstances. The majority of the airborne pollutants were caused by the usage of coal. From Friday, December 5, until Tuesday, December 9, 1952, it persisted before dispersing fast as the weather altered.

Significant disruption was caused by the smog, which was far worse than past "pea-souper" pollution storms in that it reduced visibility and even entered indoor spaces. In the weeks that followed the incident, government medical studies suggested that up to 4,000 people had died directly as a result of the pollution and that 100,000 more had become ill as a result.

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The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Explanation:

Forces are given many names, such as push, pull, thrust, lift, weight, friction, and tension. Traditionally, forces have been grouped into several categories and given names relating to their source, how they are transmitted, or their effects. The most important of these categories are discussed in this section, together with some interesting applications. Further examples of forces are discussed later in this text.

An electron will emit energy in quanta when its energy state changes from 4p to 3s.

When a quantum mechanical system or particle is bound, or spatially constrained, it can only take on specific discrete energy values, or energy levels. As opposed to classical particles, which can have any energy level, this. The phrase can also refer to the energy levels of nuclei or the vibrational or rotational energy levels in molecules. The term is most frequently used to describe the energy levels of the electrons in atoms, ions, or molecules that are confined by the electric field of the nucleus. A system with such distinct energy levels is said to have a quantized energy spectrum.

An electron shell, also known as a primary energy level, is the orbit of one or more electrons around the nucleus of an atom in chemistry and atomic physics. The "1 shell" (also known as the "K shell") is the shell that is closest to the nucleus. The "2 shell" (also known as the "L shell"), "3 shell" (also known as the "M shell"), and so forth are the shells that are further and more away from the nucleus. The shells are either labelled alphabetically with X-ray notation letters or with the primary quantum numbers (n = 1, 2, 3, 4...) (K, L, M, N...).

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Answer:

mitochondria,

Explanation:

Cellular respiration occurs inside cells; specifically, cellular respiration happens inside the mitochondria, the powerhouse of the cell. Cellular respiration is a critical function by which cells release energy for various cellular activities like locomotion, biosynthesis, and even the transportation of molecules between membranes.

Answer:

0.7 g/cm³

Explanation:

hey there,

< The formula for density is \(p = \frac{m}{v}\)  where m = mass, v = volume, and p = density. An easy way to remember the formula is density equals love. I found this easy to remember because p = ♡ and when you think about it, if you split the heart in half through the middle like a fraction, it will make \(\frac{m}{v}\) (if you don't understand what I'm saying, try writing it out and you will be able to see what I'm talking about!)

We already know that the block is 253 g so the mass is 253 g.

To find the volume, always multiply the 3 values width, length, and height whenever you are trying to find the volume of a block.

15.24 cm x 6.64 cm x 3.56 cm = 360.25 cm³

Now plug it into the formula.\(p = \frac{m}{v}=\frac{253}{360.25} = 0.7 g/cm\)³ >

Hope this helped! Feel free to ask anything else.

Density of a substance is its mass divided by volume. Volume of the cube is calculated to 360.24 cm³ and thus the density of the cube is 0.7023 g/cm³.

Density of a substance is the measure of its mass per volume. Thus mathematically it is the ratio of mass to the volume of th substance. Density of a substance depends on the bond type, mass, volume, temperature and pressure.

The ratio of density of a substance to the density of water is called specific gravity. If the specific gravity is greater than one the body will sink in water and if it is less than one it will float on water.

The mass of the block is given 253 g and the volume can be calculated from the product of length,breadth and height.

Volume = 15.24 cm × 6.64  cm × 3.56 cm

             = 360.24 cm³.

Density = mass/volume

             = 253 g/ 360.24 cm³

             = 0.7023 g/cm³

Hence, the density of the block is 0.7023 g/cm³.

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Answer:In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction

Explanation:

Answer:

EEEEEeeEEeEEEEEEEeEEEEEEEEEE

Explanation:

e

Answer:

0.241 M

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

HBr + NaOH —> NaBr + H₂O

From the balanced equation above,

The mole ratio of acid, HBr (nₐ) = 1

The mole ratio of base, NaOH (n₆) = 1

Finally, we shall determine the concentration of the NaOH solution. This can be obtained as follow:

Volume of base, NaOH (V₆) = 20 mL

Volume of acid, HBr (Vₐ) = 24.1 mL

Concentration of acid, HBr (Cₐ) = 0.2 M

Concentration of base, NaOH (C₆) =?

CₐVₐ / C₆V₆ = nₐ/n₆

0.2 × 24.1 / C₆ × 20 = 1/1

4.82 / C₆ × 20 = 1

Cross multiply

C₆ × 20 = 4.82

Divide both side by 20

C₆ = 4.82 / 20

C₆ = 0.241 M

Therefore, the concentration of the NaOH solution is 0.241 M

To determine when an acid-base reaction is complete when the concentration of one of the reactants is unknown is by Titration.

The use of indicators is typically the earliest method by which individuals become aware of acid-base titrations. Simply put, indicators are substances that alter color in response to pH. They are typically weak acids with a color difference between the conjugate base and molecular acid. A pH meter and a graph of the pH against the volume of the titrant administered can both be used in acid-base titrations. The equivalency point is where the graph begins to increase sharply. We can tell by looking at the reaction. If it stops bubbling or steaming it is finished.

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Explanation:

a. The melting point is at 20C and the boiling point is at 80C. The melting point is when a solid is going through a phase change to become a liquid, that is the 1st plateau in the graph. The boiling point is when the liquid is going through vaporization to become a gas. That is the second plateau.

b. At 30C, it is a liquid, since our melting point is at 20C.

c. The substance before 20C is a solid, as we add energy, it will melt and become a liquid.

The graph is different for each substance but in this same configuration where a change in the graph is a different phase or a phase change.

Where that first incline = solid

1st plateau= melting or freezing

2nd incline= liquid

2nd plateau= vaporization or condensation

3rd incline= gas