How does a balanced chemical equation demonstrate the Law of Conservation of Mass?


(1 point)

A. It shows that all compounds remain bonded after the reaction

B. It shows that no atoms have been gained or lost during the reaction

C. It shows that the properties of the elements stay the same after the reaction

D. It shows that only physical changes follow the Law of Conservation of Mass

Thank you If you help!​

Answer:

Newton believed that gravity was a force.

The law of universal gravitation offers a mathematical explanation for the attraction between the moon and Earth.

Newton was the first to have the idea that gravity is everywhere.

Answer:every object attract every other object

Explanation:

Answer:

Calcium is more reactive.

Explanation:

It is higher in the reactivity series, and contains more energy levels.

lithium Li forms a +1 ion it means it has one more proton than it does electrons

A lithium atom has 3 protons and 3 electrons. it is able to lose one among its electrons, making it an ion. It now has greater wonderful protons than electrons so it has an typical high-quality fee. therefore it's miles a effective ion.

to have a+1 charge, Lithium have to have lost an ion. therefore the range of electrons in Lithium is two.

On a periodic table, we can see that the atomic number for lithium is three. The atomic range represents the variety of protons in an atom, so Lithium has 3 protons.

Atoms of institution 1 elements all have one electron of their outer shell. which means the alkali metals all have comparable chemical properties . whilst a set 1 element takes component in a reaction, its atoms each lose one electron. This forms positively charged ions .

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Explanation:

the treatment of disease by the use of chemical substances, especially the treatment of cancer by cytotoxic and other drugs.

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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increasing the temperature decreases the value of equilibrium constant for the forward reaction is endothermic

Answer:

Increasing the temperature decreases the value of the equilibrium constant. Where the forward reaction is endothermic, increasing the temperature increases the value of the equilibrium constant

The Br ion, which is the ion form of bromine, has an electron structure that is identical to the inert gas argon.

In its neutral state, bromine has the electron configuration [Ar] 3d10 4s2 4p5, with 35 electrons distributed among its various energy levels. When bromine loses one electron to form the Br ion, it attains a stable electron configuration similar to that of the noble gas argon. Argon's electron configuration is [Ne] 3s2 3p6, with a total of 18 electrons. By losing one electron, the bromine ion achieves a configuration of [Ar], which is identical to that of argon. This similarity in electron configuration allows the Br ion to attain stability, similar to the inert noble gas argon.

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Answer:

LiOH

Explanation:

LiOH has the tag "aq" which stands for aquatic.

Our answer is LiOH.

Although the elements' properties are the same for all of them, they are distinct from those of the compound.

A property with several buildings in one location is referred to as a real estate compound. Even while many of them serve as playgrounds for such famous and wealthy, they serve other functions as well.

Chemical characteristics of a compound are distinct from those of the elements its includes. When two or even more atoms get chemically linked, a material called a molecule is created (bonded).

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Answer: A. True

Explanation:

Answer:

Explanation:

The molecular formula of the compound is C₄H₈.

Let in  compound number of moles of C and H be x and y respectively.

Number of moles of CO₂ = mass of CO₂ / molar mass CO₂

= 3.14/44

= 0.0714

Number of moles of H₂O = mass of H₂O / molar mass H₂O

= 1.28/18

= 0.0711

Since 1 mol of CO₂ has 1 mol of C.

Number of moles of C in CO₂ = 0.0714

so, x = 0.0714

Since 1 mol of H₂O has 2 mol of H

Number of moles of H = 2 × 0.0711 = 0.1422

Dividing by smallest number to get simplest whole number ratio:

For, C: 0.0714/0.0714 = 1

For, H: 0.1422/0.0714 = 2

So empirical formula is: CH₂

Option 1 and option 4 has empirical formula of CH₂

molar mass of C₃H₆ = 3 × 12 + 1 × 6 = 42 g/mol

molar mass of C₄H₈ = 4 × 12 + 1 × 8 = 56 g/mol

So, the molecular formula is C₄H₈.

Hence, option 4 is correct.

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Answer: Reflectors use a mirror to collect the light, whilst refractors use a lens while, Refractor telescopes require a large lens at the front to direct the incoming light to the lens.

Given that the enthalpy change for the reaction is -67 kJ, the reaction is exothermic, and energy is released as the reaction occurs.

Enthalpy refers to the amount of energy that is stored in a compound's chemical bonds or the heat released or absorbed during a chemical reaction. It is a thermodynamic property that determines the quantity of energy released or absorbed during a process such as chemical reaction or change in state.

When a reaction absorbs energy from its surroundings, it is known as an endothermic reaction. The reaction's enthalpy, which is the energy released or absorbed during a reaction, is positive. The system absorbs energy, which is why it is denoted by a positive value.

When a reaction releases energy into the surrounding, it is referred to as an exothermic reaction. The reaction's enthalpy, which is the energy released or absorbed during a reaction, is negative. The system releases energy, which is why it is denoted by a negative value.

Therefore, the reaction is exothermic and energy is released when the reaction occurs.

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In an experiment on recrystallization, scratching the surface of the flask and adding a seed crystal promote recrystallization involve nucleation sites, inducing crystallization, enhanced purity and control over Crystal size.

In the process of recrystallization, scratching the surface of the flask and adding a seed crystal promote the formation of high-quality crystals by providing nucleation sites and inducing crystallization. Here's a detailed explanation:

1. Nucleation Sites: When a solution is cooled during recrystallization, it becomes supersaturated, meaning it contains more solute than it can normally dissolve at that temperature. However, for the solute to come out of the solution and form crystals, it needs a surface or structure to initiate the process, known as a nucleation site. By scratching the surface of the flask or adding a seed crystal, you create these nucleation sites where crystal growth can start. The imperfections or roughness on the flask surface or the seed crystal's structure provide favorable sites for solute particles to aggregate and begin crystal formation.

2. Inducing Crystallization: Once nucleation sites are present, they act as starting points for crystal growth. The seed crystal added to the solution provides a pre-formed crystal structure for the solute particles to align with and grow upon. The lattice structure of the seed crystal serves as a template, guiding the arrangement of solute particles as they come out of the solution. This leads to the growth of well-organized and well-defined crystals.

3. Enhanced Purity: Another advantage of scratching the flask or using a seed crystal is that it promotes the formation of a single, pure crystal. As the solute particles begin to crystallize around the nucleation sites, they tend to join and grow together, reducing the chances of impurities being incorporated into the crystal lattice. This selective growth improves the purity of the resulting crystals, which is essential in many applications, such as in the pharmaceutical or semiconductor industries.

4. Control over Crystal Size: The presence of nucleation sites and seed crystals also allows for control over crystal size. By adjusting factors such as temperature, solvent concentration, and the number of nucleation sites, it is possible to influence the rate of crystal growth.

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Iron l is said to have a high permeability. High coercivity, high retentivity, and high permeability materials make up the permanent magnets. An object made of a substance that has been magnetized and produces its own persistent magnetic field is referred to as a permanent magnet.

In contrast to an electromagnet, which is made of a coil of the wire wrapped around a ferrous core and needs an electric current to create a magnetic field, a permanent magnet's magnetism is "always on" and it creates its own permeability magnetic field. A common example is a refrigerator magnet used to the keep notes on the door of the refrigerator.

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Answer:

A It changes shape and volume

Explanation:If a liquid turns into a gas it starts to change shape since they are not the same

Answer:I believe it’s A

Explanation:when a liquid turns into a gas it the volume increases of the substance and of course the shape changes

The notation for the enthalpy of the solution is ∆Hsol. The correct answer is option ∆Hsol.

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Answer:

C. 18

Explanation:

its b(8)

Explanation:

the third energy level can actually hold up to 18 electrons but it's not filled when it has 8 electrons

Answer:

The specific heat capacity of the unknown metal is 0.223 \(\frac{J}{g*C}\)

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

418.6 J= c* 75 g* 25 C

Solving:

\(c=\frac{418.6 J}{75 g*25 C}\)

c= 0.223 \(\frac{J}{g*C}\)

The specific heat capacity of the unknown metal is 0.223 \(\frac{J}{g*C}\)

The K value of 5.62 x 10-102A may be used to determine the hydroxide concentration of an equilibrium ammonia solution at a concentration of 0.10 molar. The equilibrium constant for the reaction of ammonia with water to produce ammonium and hydroxide ions is known as the K value.

The reaction's equation is as follows: NH3 + H2O -> NH4+ + OH- This equation is used to determine the K value: K = [NH3][NH4+][OH-] The K value may be modified to get the hydroxide concentration .

Since the ammonia concentration is 0.10 molar: [OH-] = K x [NH3] = 5.62 x 10-102A x 0.10 = 3.17 x 10-12 molar As a result, the hydroxide concentration of an equilibrium ammonia solution at 0.10 molar is 3.17 x 10-12 molar.

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Liquid drain cleaner is a strong base, and milk is slightly acidic with a pH value of 6.6.

Liquid drain cleaner, often containing sodium hydroxide (NaOH) or another strong base, is highly alkaline and typically has a pH value above 7. This makes it a strong base. The high pH of drain cleaner allows it to effectively break down organic materials and dissolve clogs in drains.

Milk, on the other hand, is slightly acidic with a pH value of 6.6. This acidity is mainly due to the presence of lactic acid, which is produced by bacteria during the fermentation of lactose in milk. While milk is not as acidic as some other substances, its pH value below 7 indicates its slightly acidic nature.

Now let's consider the pH values you would expect for the given aqueous solutions:

1. An aqueous solution of HNO3 (nitric acid): Nitric acid is a strong acid. Therefore, you would expect the pH of an aqueous solution of HNO3 to be low, typically below 2.

2. An aqueous solution of NaCl (sodium chloride): Sodium chloride is a neutral compound and does not exhibit acidic or basic properties. Therefore, the pH of an aqueous solution of NaCl would be around 7, indicating neutrality.

3. An aqueous solution of NaOH (sodium hydroxide): Sodium hydroxide is a strong base. Thus, you would expect the pH of an aqueous solution of NaOH to be high, typically around 14.

In summary, the liquid drain cleaner is a strong base, milk is slightly acidic, the pH value of an aqueous solution of HNO3 would be low, around 2 or below, the pH value of an aqueous solution of NaCl would be neutral, around 7, and the pH value of an aqueous solution of NaOH would be high, around 14.

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Answer:

\(2~CH_3OH+3~O_2\rightarrow2~CO_2+4~H_2O\\\)

The coefficients would be 2, 3, 2, and 4.

Explanation:

If we want to check this we would multiply the coefficient by each element. What we want is to have the same number of atoms on each side.

Reactant side:

Product side:

And that's it!

Answer: Neutral

Explanation: This is because, in the ph scale, greater than 7 indicates base or alkaline (basic), while less than 7 indicates that it is acidic.

Answer:

exothermic

Explanation:

An exothermic reaction gives off heat energy. Condensation is the process by which water vapor turns into liquid water. This typically occurs when water vapor molecules come into contact with cooler molecules. This causes the water vapor molecules to lose some energy as heat which is a exothermic reaction.

When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.

Answer:

The phenotypic percentage of having yellow or green seeds is 50% for having either of the two colours

Explanation:

The crossing to determine the offsprings is shown in the image attached where we have two green (Yy) seeds and two yellow (yy) seeds as offsprings.

Thus, the phenotypic percentage of having yellow or green seeds is 50% for having either of the two colours.

Note, the dominant allele is "Y" while the recessive allele is "y". Thus, Yy would produce a yellow colour while yy would produce a green colour (as both mentioned in the question).

Also note that phenotype describes the outward properties/characteristics of an individual.

Explanation:

the first question's answer is a

the second question's answer is c

Please find the terms with their correct description in the explanation section.

In an aqueous solution, an electrolyte is a material that separates or ionizes into cations (positively charged ions) and anions (negatively charged ions). Depending on how well it ionizes and how much conductivity it has, an electrolyte can be either strong or weak. A non-electrolyte, however, does not conduct electricity or ionize in a solution.

Based on this;

1. Weak electrolyte: Has a medium level of conductivity i.e. partially conducts electricity

2. Strong electrolyte: Contains a complete solute

3. Non-electrolyte: Has little or no conductivity i.e. cannot conduct electricity because it doesn't dissociate into ions.

4. Strong electrolyte: Has the highest conductivity i.e. conducts electricity very well.

5. Strong electrolyte: Contains a completely dissociated solute i.e. the solute of the electrolyte separates into anions and cations completely.

6. Weak electrolyte: Contains a partially dissociated solute i.e. the ions of the solute do not ionize completely in the solution.

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Answer:

transitive ​physicsif something conducts heat or electricity, heat or electricity can move through it.

Explanation:

Hello good afternoon...God bless here is the answer to your following question-

definition of conduct (in physics)- transitive ​physics if something conducts heat or electricity, heat or electricity can move through it.

Answer:

Latitudes are used to indicate a precise location of any feature on the earth's surface.

Temperature changes with latitudes .At higher latitudes, the Sun's rays are less direct. The farther an area is from the Equator, the lower its temperature. At the poles, the Sun's rays are least direct.Near the equator sun's rays are perpendicular resulting into very high temperatures. Generally, around the world, it gets warmer towards the equator and cooler towards the poles.