How do you find the moles of H2O?.

Answer:45000

Explanation:

To determine how many chlorine atoms are present in a 7.30 g sample of iron(II) chloride (FeCl2), you can use the molar mass of FeCl2 and the given mass of the sample.

First, you need to convert the mass of the sample from grams to moles using the molar mass of FeCl2:

mass (g) / molar mass (g/mol) = moles

7.30 g / 126.8 g/mol = 0.0578 moles

Iron(II) chloride is composed of one atom of Iron and two atoms of chlorine, so for every 1 mole of FeCl2, there are 2 moles of chlorine atoms.

To find the number of chlorine atoms in the sample, we need to multiply the number of moles of FeCl2 by the number of chlorine atoms per mole:

moles of FeCl2 x (number of chlorine atoms / 1 mole of FeCl2) = moles of chlorine atoms

0.0578 moles x 2 = 0.1156 moles

To convert moles of chlorine atoms to the number of atoms, we need to multiply by Avogadro's number which is 6.022 x 10^23 atoms/mol

0.1156 moles x 6.022 x 10^23 atoms/mol = 6.93 x 10^22 atoms of chlorine.

So 7.30 g sample of iron (II) chloride contains 6.93 x 10^22 atoms of chlorine.

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The recycling plant needs to separate two types of plastic: ABS, d = 1.15 g/mL and PET, d = 1.35 g/mL. No, the two plastics will not be separated because both types would sink when added to the solution of NaCI. Therefore, option A is correct.

The term density is defined as the ration of mass and volume. It is represented by the formula as follows:

Density = Mass / Volume

If an object is denser than NaCl solution, then it will sink when placed in solution, and if it is less dense than NaCl solution, it will float.

The densities of both ABS and PET are more than the density of NaCl solution, Therefore both will sink in the NaCl solution.

Thus, option A is correct.

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Answer:

D. To restore the population of a species

Explanation:

Captive-breeding programs breed endangered species in zoos and other facilities to build a healthy population of the animals. Species-survival plans coordinate with zoos around the world to bring species together for breeding that ensures genetic diversity.

The intermolecular forces that contribute to creating a solution of [tex]KBr[/tex] in [tex]H_2O[/tex] are Ion-Dipole Intermolecular force and H-Bonding.

[tex]KBr[/tex] is an ionic compound, which contains potassium ions ([tex]K^+[/tex]) as cations and Bromide ions ([tex]Br^-[/tex]) as anions.

On the other hand,  [tex]H_2O[/tex] is a polar compound. In [tex]H_2O[/tex], as the electronegativity of oxygen is much greater than that of hydrogen, the oxygen atom attracts the electrons of the covalent bond towards itself. Therefore, hydrogen atoms get partially positive and oxygen atom gets partially negative.

Hence, when [tex]KBr[/tex] is added to water, there is an Ion-Dipole intermolecular force acting in between them.

It is also true that bromine is highly electronegative as compared to hydrogen. Thus, there will be the formation of hydrogen bonding in between [tex]KBr[/tex] and [tex]H_2O[/tex].

Hence, The intermolecular forces that contribute to creating a solution of [tex]KBr[/tex] in [tex]H_2O[/tex] are Ion-Dipole Intermolecular force and H-Bonding.

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Answer: False

Explanation:

Every atom of an element will have the same number of protons in its nucleus. This is how we set apart different elements. Therefore, if two elements were to have the same mass numbers but different atomic numbers, they cannot be considered atoms of the same element

Answer: Electrons

Explanation: Electrons are much smaller than Protons and Neutrons. Protons and neutrons each weigh about 1 amu.

The word particle comes from the fact that a neutron, which is what is found in the nucleus of an atom, has no electrical charge and is therefore electrically neutral.

Describe neutrons.

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The enthalpy change for the chemical reaction in which 2400kJ per mole of reactants is absorbed when bonds are broken and 3200kJ per mole of products is released when bonds are made is  -800 kJ.

The enthalpy change of a chemical reaction that takes place at constant pressure is known as the Heat of Reaction (also known as the Enthalpy of Reaction). It is a thermodynamic unit of measurement that can be used to determine how much energy is released or created per mole during a reaction.

Enthalpy change = sum of bond energies of reactants - sum of bond energies of products

Enthalpy change of the reaction = 2400 - 3200 kJ

Enthalpy change of the reaction = -800 kJ

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When 44 grams of propane reacts, 72.0 g of water is produced.

The molar mass of propane (C₃H₈) is 44 g/mol and that of water (H₂O) is 18 g/mol.

44.0 grams of propane is equivalent to 1 mole of propane.

According to the balanced chemical equation,

C₃H₈+ 5O₂ → 3CO₂ + 4H₂O

1 mole of propane produces 4 moles of water.

So, burning 44.0 g (1 mol) of propane will produce 4 moles of water.

Mass of water = moles x molar mass

Mass of water = 4 × 18 = 72.0 g.

So, the mass of water is 72.0 g.

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The main minerals that may contribute to hypertension when consumed in excess include sodium, potassium, and calcium.

Eating too much of certain minerals can lead to hypertension, a condition that can cause high blood pressure.

Too much sodium can cause the body to retain water, leading to increased blood pressure.

Potassium can also affect blood pressure, as it influences the amount of sodium in the body.

Calcium is important for regulating the contraction and relaxation of muscles, including those of the heart. When calcium levels become too high or excess, it may lead to hypertension.

Therefore, it is important to keep an eye on your mineral intake to ensure that it remains within healthy limits.

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Answer: Under normal conditions. Each cell in the human body has 23 pairs of chromosomes (46 in total). Half come from the mother and half from the father.

Explanation: Chromosomes are transferred in pairs.

Under normal conditions. Each cell in the human body has 23 pairs of chromosomes (46 in total). Half come from the mother and half from the father.

Two of these chromosomes (the X and the Y chromosome) determine one’s sex as male or female. They are called sex chromosomes:

• Females have 2 X chromosomes.

• Males have 1 X and 1 Y chromosome.

The mother gives an X chromosome to the child. The father may contribute either X or Y. The chromosome from the father determines if the baby is born male or female.

The remaining chromosomes are called autosomal chromosomes (22 pairs).

1 chromosome from mother+ 1 chromosome from father+ 22 pair autosomal chromosomes= 46

Answer:

We inherit a set of 23 chromosomes from our mothers and another set of 23 from our fathers. One of those pairs are the chromosomes that determine the biological sex of a child – girls have an XX pair and boys have an XY pair, with very rare exceptions in certain disorders.

Diphosphorus trichloride has a phosphorus content of 22.554%. Phosphorus is indeed a mineral that can be found in many foods naturally as well as in supplements. It has a number of functions in the body. It is a crucial component of cell membranes, bones, and teeth.

Frequently, high phosphorus does not result in any symptoms. On the other hand, an excess of phosphorous in your blood can result in calcium loss from your bones and other body tissues, resulting in low calcium levels (also called hypocalcemia). Low calcium levels do result in symptoms like: tense muscles

Severe vomiting & diarrhea, both of which are characterized as "burning," "luminescent," and with a garlic-like odor, are frequently brought on by ingestion of basic white or yellow phosphorus. Dysrhythmias, comas, hypotension, and even death are potential additional symptoms of severe poisoning.

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The correct answer is D. Conductors have more free electrons as compared to insulators.

There are two different types of substances on the basis of their electrical properties: conductors and insulators. Conductors are those that can pass electricity through it. Example: Water. Insulators are those which cannot pass the electricity or the electric motion through themselves. Example: air. This is because the no of free electrons that will carry the charge is more in the case of conductors. Charges in insulators are restricted to one position only which made it suitable for wire coatings.

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TLC method is mostly often used for the qualitative as well as quantitative sample analysis.

TLC (Thin layer chromatography) is an affinity based method which is used to separate the compounds present in a mixture. TLC is a highly versatile separation method which is widely used for both qualitative as well as quantitative sample analysis. It can be used to analyze the virtually any substance class, including steroids, alkaloids, lipids, nucleotides, glycosides, carbohydrates, as well as fatty acids.

Thin Layer Chromatography is that technique which will be used to isolate the non-volatile mixtures. The experiment is conducted on a sheet of the aluminum foil, glass or plastic which is coated with a thin layer of adsorbent material. The material which is usually used i.e aluminum oxide, silica gel or cellulose. After completion of the separation, each component will appears as spots and separated vertically.

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From september 1 to june 1, the number of daylight hours observed each day in new york state will be option A: Decrease only.

The number of daylight hours observed each day in New York State will go down. This is due to the earth's tilt on its axis and its orbit around the sun, which causes the amount of daylight to change throughout the year.

In the northern hemisphere, the fall and winter months have shorter daylight hours than the spring and summer months. On September 1st, it is the start of fall, which means the days will start getting shorter.

Therefore, As we move towards June 1st, the days will continue to get shorter until we reach the shortest daylight hours of the year on the winter solstice (around December 21st or 22nd), after that the days will start getting longer again.

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The number of the molecules of water is 1.8 g is  6.02 * 10^22 molecules.

We can be able to obtain the molecules from the Avogadro's number. We know that the number of the molecules that we find in the compound can be gotten by the use of the proposition that was put forward by Avogadro.

Number of moles of the water = 1.8g/18 g/mol = 0.1 moles

We know that;

1 mole of water contains 6.02 * 10^23 molecules of water

0.1 moles of water would contain 0.1 mole * 6.02 * 10^23 molecules/ 1 mole

= 6.02 * 10^22 molecules

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Answer:

B. Developing new methods of conservation

Explanation:

Such as the Germ Plasm in the excerpt. This is an example of new conservation methodology

The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride. Carbonates are the most soluble.

The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can dissolve its maximum quantity of solute before reaching equilibrium. A supersaturated solution results when extra solutes are dissolved past its equilibrium solubility point under specific circumstances.

Dissolution is the action of disintegrating. In contrast to the speed of solution, which specifies how rapidly a molecule dissolves in a solvent, solubility is not a feature of matter. The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

Therefore,  the order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

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Answer:

both

Explanation:

The three scientists' measurements are both accurate and precise.

Accuracy refers to how close a measurement is to the true value, and precision refers to how close multiple measurements are to each other.

In this case, the measurements are accurate because they are all very close to the true value of the standard meter bar, which is defined as 1 meter.

The measurements are precise because all the measurements are very close to each other. They are all within 0.01 m of each other, indicating that the scientists are able to consistently measure the same length, indicating that they are precise in their measurements.

It's worth noting that, even though the measurements are accurate and precise, it's still possible to have a small measurement error, this is because the true value of the standard meter is not 1.09 m or 1.08 m, but the International System of Units defined it to be exactly 1m, and the difference between the measurements and the true value is very small.

The measurements provided by the three scientists are precise but not accurate.

The measurements provided by the three scientists can be analyzed in terms of accuracy and precision. Accuracy refers to how close the measured values are to the true value, while precision refers to how close the measured values are to each other. In this case, the measured values are 1.09 m, 1.09 m, and 1.08 m. These measurements are not accurate because they are not equal to the true value of a standard meter bar, which is 1.00 m. However, they are precise because they are very close to each other.

Although the measurements are not accurate, they are consistent with each other, indicating precision in the measurements. In scientific experiments, it is important to have both accuracy and precision. Accurate measurements ensure that the measurement is close to the true value, while precise measurements establish consistency and reliability in the experiment results.

In conclusion, the measurements provided by the scientists are precise but not accurate.

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Answer:

Genetic code consists of a sequence of nucleotides which are the building blocks of DNA. Each nucleotide contains a four-letter code, which is used to construct proteins in the organism. These proteins are responsible for the physical and behavioral traits of the organism. Changes in the genetic code can occur through mutation, which is when a mistake is made in the nucleotide sequence during DNA replication. This can lead to changes in the proteins and the traits of the organism. Some of these changes can be beneficial, while others can be harmful. Ultimately, the effects of these genetic changes depend on the environment in which the organism lives and the type of change that has occurred.

A drop taken from the top of a solution of salt and water will not be identical to a drop taken from the bottom of the mixture because the salt and water molecules will be distributed differently throughout the mixture.

What is a solution?

A solution is a homogeneous mixture of two or more substances. In a solution, the solute, which is the substance that is dissolved, is evenly dispersed throughout the solvent, which is the substance that the solute is dissolved in.

Salt is denser than water, so it will tend to settle to the bottom of the mixture over time. This means that a drop taken from the top of the mixture will have a lower concentration of salt than a drop taken from the bottom.

Additionally, due to the process of diffusion, the salt molecules will tend to move from areas of higher concentration to areas of lower concentration, so the concentration of salt will be different at different points throughout the mixture. Therefore, a drop taken from the top will have less salt concentration than a drop taken from the bottom.

Therefore, as the salt and water molecules are distributed differently throughout the mixture a drop from the solution will be identical to that of the bottom of the jar.

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The image that is shown is the gain of two electrons by the oxygen atom.

We have to note that when we talk about the term "ion" we are talking about such a specie that can be formed by the loss or gain of electrons. Thus an ion is positive if it formed by the loss of electrons and the ion is negative if it is formed by the gain of electrons.

In the case of the image that we have here, we can see that there is again of two electrons by the oxygen atom and this is how we form the oxygen ion that has ten electrons and eight protons.

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Using  Speed, distance and time relation, the distance is 400 kilometers.

Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.

The International System of Units defines a metre as the distance unit. It's interesting to note that many other derived units or quantities, such as volume, area, acceleration, and speed, may be constructed using this as the basic unit and a few formulae.

20 kilometers per hour is the speed per half-hour.

⇒ Speed in kilometers per hour: 40 × 2 = 80

Distance x time = speed

Distance = Time × Speed

= 80 × 5

= 400 miles

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Answer:

0.016 moles

Explanation: Because you are doing P4, you take the molar mass/atomic mass of phosphorous which is 30,97(rounded up) and multiply it by 4 since that's the subscript. Then you take 2.0 grams and divide it by the molar mass, which is 123.88, and that gives you 0.016 moles (rounded up)

Two species can directly compete for the same resource when they are in contact with one another such as for food, space, mates, or water.

One example of direct competition is two lions competing for a mate.

Competition can be described as the direct or indirect contact of organisms that results in a change in fitness when the organisms share a resource.

Competition is most commonly thought of as the interaction of individuals that compete for a common resource that is in limited supply.

Individuals who directly compete with one another for the same resource are said to be in direct competition.

Some examples of competition are:

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The name given to the substance such as metal hydroxides and metal oxides that can nuetralise acids is Base or Alkali.

A base is a proton-accepting molecule or ion, according to chemists. That makes OH- a base. They continue to refer to bases dissolved in water as "alkali." Sodium hydroxide, for example, dissolves in water and separates into Na+ and OH-ions. The result is an alkali, and it is a source of the base OH-.

Some properties of bases are given below:

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Gradually graduated cylinders are available in a variety of sizes, or volume capacities, and, like a measuring cup, are used to determine volume by pouring liquid to the cylinder and comparing the liquid level to the graduated scale. The volume that was measured is the same as the amount of liquid that was put inside the cylinder.

The Complete Question is  graduated cylinders.

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Gradually graduated cylinders are available in a range of diameters, or volume capacities, and, like a measuring cup, are used to calculate volume by pouring liquid into the cylinder and comparing the liquid level to the graduated scale.

The complete question is,

Graduated cylinders represent .

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Recrystalization will occur.The solution may become too diluted for crystals to form if you add too much solvent. Impurities will be captured by a hastily formed crystal's lattice. The crystals that result will also be smaller.

Recrystallization is a physical process used to separate compounds based on how soluble they are. Heating the material to dissolve the compound with impurities in a mixture of a suitable solvent completes the procedure. We can remove the desired chemical or contaminants from the mixture using this method.

The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. The resulting crystals will also be smaller.

The three main types of recrystallization are;

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