how do i do this assignment?

When 10.0 grams of a substance with a solubility of 18.2 g/100 g water is mixed with 50.0 grams of water, a saturated solution is formed. This means that the maximum amount of the substance that can dissolve in the given amount of water has been reached, and any additional substance will not dissolve, resulting in a solid residue.

The solubility of a substance indicates the maximum amount of that substance that can dissolve in a given amount of solvent under specific conditions, usually at a particular temperature. In this case, the solubility is given as 18.2 g/100 g water.

When 10.0 grams of the substance is mixed with 50.0 grams of water, the total amount of water is 50.0 grams, which is less than the solubility of 18.2 g/100 g water. As a result, a saturated solution is formed, where the maximum amount of the substance that can dissolve in the given amount of water has been reached.

Any additional substance that is added beyond the solubility limit will not dissolve and will remain as a solid residue at the bottom of the container. Therefore, after mixing 10.0 grams of the substance with 50.0 grams of water, a saturated solution is formed, and the remaining substance will form a solid residue.

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Answer:

the first is unbalanced

because the number of hydrogen are not equal on both sides

the second one is balanced

because the number of nitrogen and hydrogen atoms are equal on both sides

and the third one seems to be incomplete

Chemical energy is the energy that atoms have due of how they are bound together. varied substances have varied amounts of chemical energy, which impacts whether energy is absorbed or released during a chemical reaction.

The energy necessary for a chemical reaction to begin is known as activation energy. It is often thermal energy, although it can be any type of energy. Unless a catalyst is utilised, the quantity of activation energy required for a certain reaction is always the same.

A catalyst is a unique material that minimises the amount of energy required for activation. Reaction energy diagrams depict the energy flow of a chemical reaction. The illustrations depict the following energy values: • The energy of the reactants • The energy of the reactants • The activation energy • The energy of the products.

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The Lewis model is a method to predict the formation of a chemical bond between atoms. It involves determining the number of valence electrons in each atom and then pairing them up to form a bond.

Sr has 2 valence electrons, while S has 6 valence electrons. To form a compound, Sr must lose its two valence electrons, while S must gain two electrons. The resulting compound will have the same number of positive and negative charges, which will cancel out. Therefore, the chemical formula for the compound formed between Sr and S is SrS.

Mg has 2 valence electrons, while Cl has 7 valence electrons. To form a compound, Mg must lose its two valence electrons, while Cl must gain one electron. However, Cl cannot gain two electrons to form a stable compound. Therefore, Mg must lose both of its valence electrons to form a compound with Cl. The resulting compound will have one positive charge (from Mg) and one negative charge (from Cl), which will cancel out. Therefore, the chemical formula for the compound formed between Mg and Cl is MgCl2.

Na has 1 valence electron, while I has 7 valence electrons. To form a compound, Na must lose its valence electron, while I must gain one electron. The resulting compound will have one positive charge (from Na) and one negative charge (from I), which will cancel out. Therefore, the chemical formula for the compound formed between Na and I is NaI.

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Here is  the pairing of elements with their respective electron behaviors:

Electron loss and electron gain refer to the transfer of electrons between atoms during chemical reactions, specifically in the formation of chemical bonds.

Electron loss and electron gain are fundamental processes in chemical reactions, as they allow atoms to achieve a more stable electron configuration by attaining a full valence shell, similar to the noble gases. This transfer of electrons leads to the formation of ionic bonds between positively and negatively charged ions or can contribute to the formation of covalent bonds by sharing electrons between atoms.

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The unknown mineral is gold because of the similar properties of gold to that unknown mineral.

The unknown mineral is Gold because it has similar properties to the gold. Gold has density of 19.3 grams per cubic centimeter which is same to this unknown mineral. The hardness and mass of the mineral are also similar to the Gold.

So we can conclude that the unknown mineral is gold because of the similar properties of gold to that unknown mineral.

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Answer: 1 x 10-3 mol/L

Explanation:

Question

What concentration of H+ ions does a substance with a pH of 3 have​

the pH is the negative log of the H ion concentration in moles/liter

so pH3 has a hydrogen ion concentration of 1 x 10-3 mol/L

Hope it helps you!

-miraculousfanx-

It would require 46434 calories of heat to boil 142 g of ammonia.

When a liquid changes form into a gas, the process is called vaporization. You can watch vaporization when you boil a pot of water. Vaporization happens in two ways: evaporation and boiling. Evaporation occurs when sunlight shines on water until it changes to vapor and rises into the air

To calculate the amount of heat required to boil 142 g of ammonia, NH3, we can use the formula:

Heat = mass x heat of vaporization

where the mass is 142 g and the heat of vaporization is 327 cal/g.

Therefore, the heat required to boil 142 g of ammonia is:

Heat = 142 g x 327 cal/g

Heat = 46434 cal

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Answer:

2P + 3Cl2 => 2PCl3

Explanation:

The balanced equation is as follows:

Cr₂O₃ + 3Mg → 2CrO₃ + 3MgO

2H₂ + O₂ → 2H₂O

2NaBr + Cl₂ → 2NaCl + Br₂

A balanced chemical equation is a representation of a chemical reaction using the chemical formulas of the reactants and products. The equation shows the relative amounts of each reactant and product, and it satisfies the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction, only rearranged.

A balanced chemical equation has the same number of atoms of each element on both sides of the equation, meaning that the total mass of the reactants is equal to the total mass of the products. The balancing is achieved by adjusting the coefficients in front of the chemical formulas to ensure that the number of atoms of each element is equal on both sides of the equation.

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Explanation:

a) Sodium Hydroxide:

Volume of water = 100.0 mL

Initial temperature of water = 21.3 °C

Mass of NaOH = 9.0 g

Final temperature of water = 41.3 °C

So we had a 100.0 mL sample of water at 21.3 °C and after we added 9.0 g of NaOH the temperature increased to 41.3 °C. Let's find the heat that the water absorbed using the formula:

Q = m * Cp * ΔT

Where m is the mass, Cp is the specific heat of water (Cp = 4.186 J/g°C) and ΔT is the temperature change.

First we had 100.0 mL of water or 100.0 g (if we consider that the density of water is 1.0 g/mL) and we added 9.0 g of NaOH. Let's find the total mass.

m = total mass = mass of water + mass of NaOH

m = 100.0 mL * 1.0 g/mL + 9.0 g

m = 109.0 g

We can also find the change in temperature.

ΔT = Tfinal - Tinitial = 41.3 °C - 21.3 °C

ΔT = 20.0 °C

The dissolution of the NaOH is an exothermic process. This reaction will release heat that will be absorbed by its surroundings and the temperature of the water will increase.

Finally we can calculate the heat that was absorbed.

Qw = m * Cp * ΔT

Qw = 109 g * 4.186 J/(g°C) * 20.0 °C

Qw = 9125 J

So the water absorbed 9125 J and the reaction released -9125 J.

b) Sodium thiosulfate pentahydrate:

Volume of water = 100.0 mL

Initial temperature of water = 21.3 °C

Mass of sodium thiosulfate pentahydrate = 20.0 g

Final temperature of water = 14.2 °C

The dissolution of the sodium thiosulfate pentahydrate is an endothermic process in this case. The dissolution will absorb energy from its surroundings and the temperature of the water will decrease.

m = total mass = mass of water + mass of thiosulfate

m = 100.0 mL * 1.0 g/mL + 20.0 g

m = 120.0 g

ΔT = Tfinal - Tinitial = 14.2 °C - 21.3 °C

ΔT = -7.1 °C

Qw = m * Cp * ΔT

Qw = 120 g * 4.186 J/(g°C) * (-7.1 °C)

Qw = -3566 J

So the water released -3566 J and the dissolution process absorbed 3566 J.

Answer:

a) The water absorbed 9125 J and the dissolution process released -9125 J.

b) The water released -3566 J and the dissolution process absorbed 3566 J.

Answer:

2

Explanation:

good vibes

Conversion of 7g/dm³ of H₂O to 0.21 mol/dm³ is

Conversion is the act or process of changing something into a different state or form

Here given data is

7g/dm³ of H₂O we have to convert it into mol/dm³ = ?

Then divide by the relative formula mass

We get  H₂O then H = 1 here 2 hydrogen = 1×2 = 2 and 1 oxygen i.e 1×16 = 16 =

2×16 = 32

So,  7g/dm³/32

= 0.21 mol/dm³

7g/dm³ of H₂O to 0.21 mol/dm³

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Hexa-2,4-diene-1,6-diol,cis,cis- Muconic alcohol is the name of this Molecule.

The chemical compound 2,4-Dinitrophenol (often known as 2,4-DNP or simply DNP) has the formula HOC6H3(NO2)2. It smells pleasant and musty and is a yellow, crystalline substance. It is soluble in the majority of organic solvents as well as aqueous alkaline solutions, sublimates, and is volatile with steam.

Picric acid is a base that can be made into picramic acid, also known as 2-amino-4,6-dinitrophenol, by neutralizing it with an alcoholic solution of ammonium hydroxide. The resulting solution is then treated with hydrogen sulfide, which causes it to turn red and produce sulfur and red crystals.

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Moles of Water

Moles = mass ÷ molar mass

          = 56.00 g ÷ 18.015 g/mol

          = 3.1085 mol

Molecules of Water

Number of molecules = moles × Avogadro's Number

                                    =  3.1085 mol × (6.022 × 10²³ molecules/mol)

                                    =  1.872 × 10²⁴ molecules

Note: We could do all this calculation in one step but I separated it to make it clearer.

Answer:

The main reason why air is cooled before nitrogen and oxygen are obtained is because these two gases are much more soluble in cold air than in warm air. As a result, if air were not cooled before these gases were separated, they would simply mix back together again.

The total volume of the solution is 150 mL.

The equation for density is defined as the mass of a substance divided by its volume. In this case, we are making the assumption that the dissolved NaCl(s) does not affect the volume of the solvent water.

To determine the constants "m" and "b" in the equation for density, we need to consider the relationship between mass and volume. Let's use an example to explain this further:

Let's say we have a solution of water and dissolved NaCl(s). The total volume of the solution is 150 mL.

To find the density, we need to know the mass of the solution. Suppose the mass of the solution is 300 g. We can use the equation:

Density = Mass/Volume

Substituting the known values, we get:

Density = 300 g / 150 mL

Now, let's simplify this equation:

Density = 2 g/mL

From this example, we can see that the constant "m" in the equation for density is 2, and the constant "b" is the unit of measurement, which is g/mL in this case.

In summary, the constants "m" and "b" in the equation for density depend on the specific Band its unit of measurement. In the example provided, the constant "m" is 2, and the constant "b" is g/mL.

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Question :

Where do most fungi thrive ?

Answer :

Fungi are found all around the world and grow in a wide range of habitats, including deserts. Most grow on land (terrestrial) environments, but several species live only in aquatic habitats. Most fungi live in either soil or dead matter, and many are symbionts of plants, animals, or other fungi.

Source :

CK-12 , Edgenuity2020

Answer:

D

Explanation:

po promise meheehehehehe

The main objective of the lab is to design and develop an Artificial Neural Network model for two experiments: the McCulloch and Pitts Network and the Hebbian Network. The students will design and train a neural network system capable of performing AND and OR operations.

They will also tune the model to minimize errors by updating the weights and conducting testing. The simulation will be run in groups, where the working principles of the algorithm will be explained. The output of the neural network system will be interpreted by varying the inputs.

The lab aims to provide students with practical experience in working with artificial neural networks. In Experiment 1, the students will focus on the McCulloch and Pitts Network and implement it to perform logic operations like AND and OR. They will train the neural network model and update the weights to minimize errors. Through testing, the effectiveness of the designed model will be evaluated.

In Experiment 2, the students will explore the Hebbian Network and its learning principles. They will gain insights into how the network adjusts its connections based on the input and output patterns. The students will analyze the behavior of the network and its ability to learn and adapt.

The lab emphasizes collaborative work, as students are expected to form groups and run the simulation together. This encourages discussion and explanation of the algorithm's working principles among peers. Additionally, varying the inputs and observing the corresponding outputs will allow the students to understand how the neural network system responds to different scenarios and interpret its functioning.

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Answer:

The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge. The atomic number tells you the number of protons in one atom of an element.

The chemical formula CH₂O contains 3 elements: carbon, hydrogen, and oxygen.

The chemical formula CH₂O represents formaldehyde, which is a simple organic compound.

To determine the number of elements in this formula, we count the different types of atoms that are present. In this case, there are three different types of atoms: carbon (C), hydrogen (H), and oxygen (O).

Therefore, the chemical formula CH₂O contains 3 elements: carbon, hydrogen, and oxygen.

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Answer:

Consumers must consume other organisms to get the food that they need and are known as Heterotrophs as they cannot make their own glucose. These consumers eat producers (plants). Herbivores are considered as first order consumers. These consumers eat consumers and producers (animals and plants).

Magnesium is a main-group metal element in period number 3 of the periodic table, which is the correct answer.

Period number 3 of the periodic table has eight elements that are arranged in order of increasing atomic number. These elements are sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, and argon.

The period number signifies the highest energy level that the element's electrons occupy.

The metallic character of the elements reduces, and the non-metallic character increases as you move across a period. Magnesium is a silvery-white metal and the eighth most abundant element in the Earth's crust.

Magnesium is used in alloys, pyrotechnics, and flares, and it is also used to manufacture lightweight and durable products like aircraft parts.

Magnesium is a main-group metal element and is located in Group 2 of the periodic table. It is in the same group as beryllium, calcium, strontium, barium, and radium.

It is a highly reactive metal that readily loses its two outermost electrons to form a stable cation with a 2+ charge. Magnesium ions have a high affinity for water molecules, which makes them essential in biological systems as well.

Magnesium is an essential element for human health, and it is involved in many physiological processes, including muscle contraction and relaxation, nerve transmission, and energy metabolism.

Magnesium deficiency can cause a variety of health problems, including muscle weakness, cramps, and irregular heartbeats.

In conclusion, magnesium is a main-group metal element in period number 3 of the periodic table.

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The value of K will vary depending on the specific conditions of the reaction.

The equilibrium constant, denoted as K, expresses the ratio of the concentrations (or partial pressures) of the products to the concentrations (or partial pressures) of the reactants at equilibrium. For the given reaction:

2 CH₃Cl(g) + Cl₂(g) ⇌ 2 CH₂Cl₂(g) + H₂(g)

The equilibrium constant expression can be written as:

K = [CH₂Cl₂]²[H₂] / [CH₃Cl]²[Cl₂]

Note that the concentrations of gases are usually expressed in terms of their partial pressures. If the concentrations are given in molarities, you can replace them with the corresponding partial pressures using the ideal gas law.

It's important to note that without specific information on the concentrations (or partial pressures) of the substances at equilibrium, it's not possible to calculate the numerical value of the equilibrium constant K. The value of K will vary depending on the specific conditions of the reaction.

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Answer:

option 3

Explanation:

3 is the answer u get before you balance the equation

The mass number of an ion with 109 electrons, 158 neutrons, and a 1 charge is 267. In atoms, the mass number is the total number of protons and neutrons in the nucleus.

However, ions are atoms that have gained or lost electrons, resulting in a change in their charge. In this case, the ion has a 1 charge, indicating that it has lost one electron. Since the number of protons remains the same for an element, which is determined by its atomic number, we can deduce that the atom originally had 110 electrons to balance the 110 protons. To find the mass number, we add the number of protons (110) and neutrons (158) since they contribute to the overall mass of the atom. Therefore, the ion's mass number is 267 (110 protons + 158 neutrons).

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This is a type of bonding that is formed from the from the attraction of oppositely charged ions in a compound.

For instance, MgCl2 is an ionic compound because the 2 positive ions wipossessed by the magnessium atom will attract each of the negtaive ion possessed by each of the chlorine atom to form the magnessium chloride compound

Using the Lewis symbol to demonstrate the bondng:

From the disgram, the negative ions on chlorine atoms will get attracted to the positive ions on the magnessium ion.