Compare the mass of the magnesium strip from test tube 1 with the
initial mass of the same strip measured in task 1, part A. Is the mass the
same, or is it different? If it's different, explain what may have caused
the difference.

The change that has been described is shown as L.

We know that the term change of state has to do with the process by which there is an alteration in the physical state that the material is found to be in. In this case, we have a situation in which at the beginning,  the atoms are close together but are able to slide pass one another.

We know that the former state that has been described here is the solid state and the liquid state is that in which the arrow may be pointing towards in the diagram as shown.

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Missing parts;

The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.

Which arrow represents the change of state described above?

L

M

N

O

The absolute configuration of the highlighted compound is L. The IUPAC name of the given compound is 2,3 dibromo pentane.

Organic compounds are named based on certain rules by IUPAC. The chain name is based on the number of carbon atoms in the longest chain of the molecules.

The configuration in  which the OH groups of the second carbon comes down is called D- configuration and if it is above the plane it is called L- configuration.

The given compound is in L configuration since the OH group of the second carbon is above the plane.

The IUPAC name of the given compound is 2,3 dibromo pentane. It contains 5 carbons in the longest chain and substituent at the second and third carbon.

The Fischer projection of the given compound is shown as below .

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The absolute configuration of given compound is S configuration. Absolute configuration is the stereochemical description of both the spatial arrangement.

Absolute configuration is the stereochemical description of both the spatial arrangement of the atoms inside a chiral molecular unit (or group). Since carbon is linked to four distinct substituents in organic compounds, absolute configuration is frequently significant.

The arrow should resemble a clock face since the fourth primary concern atom is positioned at the back. It can be an R-enantiomer if it is moving clockwise and an S-enantiomer if it is moving counterclockwise. The absolute configuration of given compound is S configuration.

Therefore, the absolute configuration of given compound is S configuration.

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The formula represents dissociated free ions as dissolved ionic compounds. An illustration is AgNO3(aq) + NaCl(aq) = AgCl(s) + NaNO3 (aq).

We only need to take out the spectator ions in order to formulate the net ionic equation. We are left with the net ionic equation after removing the spectator ions! The net ionic equation can be obtained by repeating this procedure for any reaction.

When a reaction reaches equilibrium, or when the concentrations of the reactants and products stop changing, it is said to be "finished." The answer becomes more straightforward if the equilibrium constant is large: the reaction is complete when the concentration of a reactant reaches zero.

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The overall chemical equation  for the given chemical reaction is CH₃CH₂CHCH₃CH₂OH +H₂SO₄[tex]\rightarrow[/tex]CH₃CH₂CHCH₃CH₂ +H₂O reactants are 2-methylbutan-1-ol  and concentrated sulphuric acid and products are 2-methylbutene and mechanism is attached below.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The compounds that react are labelled as reactants and are written on the left side of the arrow, while the substances created as a result of the reaction are labelled as products and are written on the right side of the arrow. The arrowhead indicates the reaction's direction.

A chemical equation is a mathematical representation of the chemical process, which shows how the reactants generate products. The reactants are written on the left side of an equation, while the products are written on the right side, as shown by one- or two-headed arrows. On the left-hand side of the equation, reactants are listed as beginning ingredients. Products are listed on the right-hand side of the equation as the final outcome of the reaction. The left-hand side of an equation is abbreviated LHS informally. The right-hand side is also referred to as RHS.

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In the chemistry , The reactants are the substances on the left hand side of the reactions. The products are the substances on the right hand side of the reaction.

The chemical reaction is represented by the the chemical equation . the substances on the left side of the reaction are called as the reactants. the substances on the right side of the chemical reaction are called as the product.

A  +   B        ----->   C + D

Reactants               products

The balances equation is the chemical equation where the atoms in the reactant side is equals to the atoms in the product side.

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Answer:

the graph shows that f(x)=[1/3]×

Answer:

A synthesis reaction or direct combination reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds. The product is always a compound.

Answer:

They would run 12.4274 miles.

Answer:

Explanation:

12.4274 miles.

the answer is probably rounded, so 12.43 or 12.4

The molar mass of the compound BF₃ is 66 g/mol. Percent composition of fluorine in this compound is 86.3 % and that of boron is 13.7 % .

Mass percent is a common term used to express the composition or concentration of a compound. Mass percent of an element in a compound is the ratio of its mass to the total mass of the compound multiplied by 100.

BF₃ is a covalent compound formed through the sharing of electrons between boron and fluorine.

atomic mass of fluorine = 19 g/mol

atomic mass of boron = 9 g/mol

mass of 3 F = 3 × 19 = 57 g

Molar mass of BF₃ = 57 + 9 = 66 g/mol

Mass percent of F = 57 g/66 × 100 = 86.3 %

mass percent of B = 9 /66 = 13.7 %.

Therefore, percent of composition of B and F in BF₃ are 86.3 and 13.7 % respectively.

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Answer:

H2O

Explanation:

H2O melts at 0 Celsius while everything else melts at a lower degree temp

Answer:

When a chemical reaction starts with 5 atoms of hydrogen, and the reaction goes into completion, it must give us 5 atoms of hydrogen.

This is in compliance with the law of conservation of mass which states that "in a chemical reaction, matter is neither created nor destroyed but converted from one form to another".

In chemical reactions, bonds are broken and new compounds are formed in the process. The same number of species at the start and end of the reaction must still be the same.

Explanation:

Answer:

the answer is 3

Explanation:

When you put it into a table and separate the variables, you'll get 0.80 molecules. (can you give me Brainliest? )

Based on the information provided above, it is likely that the following observations given below were made in the combustion tube when hydrogen gas was passed over heated lead (II) oxide:

In the experiment above, another observation is that the gaseous products of the reaction (water vapor and lead (II) oxide) would have cooled as they moved through the combustion tube, resulting in the formation of a colorless liquid.

Therefore, In order to make more accurate predictions about the observations that would be made in this particular scenario, additional information about the specific conditions of the reaction would be needed to make inform decision

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A balanced chemical equation is an equation where the number of atoms of each type in the reaction is the same on both reactants and product sides. The mass, as well as the change, are equal in a balanced chemical equation.

A chemical equation is a mathematical representation of the chemical process, which shows how the reactants generate products. The reactants are written on the left side of an equation, while the products are written on the right side, as shown by one- or two-headed arrows. On the left-hand side of the equation, reactants are listed as beginning ingredients. Products are listed on the right-hand side of the equation as the final outcome of the reaction. The left-hand side of an equation is abbreviated LHS informally. The right-hand side is also referred to as RHS.

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The chemical equation is said to be balanced chemical equation when the atoms in the reactant side of the chemical reaction and the the atoms in the product side are equal.

In In chemistry, the  representation of the chemical reactions with chemical equations . the substances on the left-hand side of a chemical equation are the reactants ant the substances on the right hand side are the products. The chemical equation are said to be balanced when the number of the atoms on the left side of the equation is equals to the number of the atoms on the right side of the reaction.

Thus, the chemical reaction is balanced when the atoms of the reactants side is equals to the atoms of the product side.

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Taking into account the definition of pH, the pH of the solution is 0.16.

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]

A solution is made by dissolving 18.1 g of HCl in 721 mL(or 0.721 L) of water. Being the molar mass of HCl 36.45 g/mole, the amount of moles of HCl can be calculated as:

amount of moles= 18.1 g÷ 36.45 g/mole

amount of moles= 0.4966 moles

HCl is a strong acid, meaning it dissociates completely. So:

[HCL]= [H⁺]= amount of moles÷ volume

[HCL]= [H⁺]=  0.4966 moles÷ 0.721 L

[HCL]= [H⁺]=  0.6887 moles/L

Then, the pH can be calculated as:

pH= - log (0.6887 moles/L)

pH= 0.16

Finally, the pH is 0.16.

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Answer:

X

Explanation:

The process of heat transfer in fluids is known as convection and it involves the actual movement of the molecules of the fluids from hotter to cooler regions as a result of decrease in the density of the heated molecules.

The name given to the process of heat transfer in fluids is convection.

Convective heat transfer, frequently referred to as convection, is the movement of fluids that transfers heat from one location to another.

In convection, heat energy is carried by the moving fluid. The fluid moves from one area with a high temperature to another with a low temperature. In liquids and gases, it is typically the predominant type of heat transmission.

This particular technique of heat transport combines the conduction (heat diffusion) and advection processes (heat transfer by bulk fluid flow).

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The most accurate statement is aquatic plants provide additional O2 for the pond through photosynthesis from early morning until late afternoon.

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities. Some of this chemical energy is stored in carbohydrate molecules, such as sugars and starches, which are synthesized from carbon dioxide and water hence the name photosynthesis. Photosynthesis is largely responsible for producing and maintaining the oxygen content of the Earth's atmosphere.

It supplies most of the energy necessary for life on Earth.

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The structure of 2-methylbutan-1-ol as displayed formula is CH3-CH(OH)-CH2-CH3}

The image attached below as displayed formula.

Generally, 2-Methylbutan-1-ol is an alcohol with the molecular formula C5H10O. It is a clear, colorless liquid with a sweet, fruity odor. It is also known as isoamyl alcohol or 3-methylbutanol.

It is a common constituent of many essential oils and is used as a solvent and a flavoring agent.

It is classified as secondary alcohol because the hydroxyl group is attached to a carbon atom that is bonded to two other carbon atoms.

CH3-CH(OH)-CH2-CH3}

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Answer:

Copper

Explanation:

Copper has excellent electrical conductivity, as well as malleability and ductility, making it easy to form into thin wires. Hope this helps!

Since acids are substance that can be found to have a low pH, it then follows that the substance at pH 4 is an acid based on the hydrogen ion concentration.

We would have to keep at the back of our minds that when we are talking about the acidity that our minds would have to go to the hydrogen ion concentration. On the other hand, when we are talking about the base, then our minds would have to go to the hydroxide ion concentration.

We know that when the hydrogen ion concentration and the hydroxide ion concentration of the solution is just the same then we can be able to say that what we have at that point is a solution that can be said to be neutral as we have in the case of what we have here.

Then;

pOH = - log [1.0x10-10 M]

= 10

pH = 14 - pOH

pH = 14 - 10

pH = 4

The solution must be acidic.

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Mole (mol): the volume measured by the number of particles in a mole (6.02214 * 1023).

The number of atoms in exactly 12 grams of pure carbon-12 is the molecular weight, or mole, and it has a value of one.

12.00 g C-12 is equal to 1 mol of C-12 atoms, or 6.022 x 1023 atoms.

The Avogadro's Number is the number of particles in a mole (6.0221421 x 1023).

6.022 ×1023 atoms

The same as one mole

6.022 ×1023 atoms

Conversion of Number of Atoms to Number of Molecules

Count the atoms in 2.45 mol of copper to determine its atomic weight.

The number of silver atoms in a silver ring is 1.1 x 1022. In the ring, how much silver is there in a mole?

2.45 mol Cu = 6.022 1023 atoms

1 mol equals 1.48 x 1024 atoms. Cu 1.1 1022 atoms 1 mol Ag = 1.8 10-2 mol with 6.022 1023 atoms.

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Taking into account the definition of pH and pOH, the OH- ion concentration in the solution is 1×10⁻⁶ M and the solution is basic.

The pH is a coefficient that indicates the degree of acidity or basicity of an aqueous solution and indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as:

pH= - log [H⁺]= - log [H₃O⁺]

Neutral pH is 7: if the number is higher, the solution is basic, and if it is lower, it is acidic.

Similarly, pOH indicates the amount of hydroxyl ions and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The relationship between pH and pOH  can be established as:

pOH + pH= 14

Being [H⁺]=1×10⁻⁸ M, the pH is calculated as:

pH= - log (1×10⁻⁸ M)

Solving:

pH= 8

The solution is basic because the pH is greater than 7.

Being pH= 8, pOH is calculated as:

pOH + 8= 14

pOH= 14 - 8

pOH= 6

Replacing in the definition of pOH the concentration of OH⁻ ions is obtained:

- log [OH⁻]= 6

Solving:

[OH⁻]= 10⁻⁶

[OH⁻]=1×10⁻⁶ M

In summary, the [OH⁻] is 1×10⁻⁶ M.

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Answer:

Explanation:

1

the answer is carbon-14

The mass of the sulfur that has been produced is 13.44 g.

We have to know that we have to look closely at the reaction equation that have been shown in the question as this would help nus to obtain the answer that we are looking for.

Now we have;

Number of moles of sulfur dioxide = 76 g/64 g/mol = 1.19 moles

Number of moles of hydrogen sulfide = 76 g/34 g/mol = 2.24 moles

If 8 moles of sulfur dioxide reacts with 16 moles of sulfur dioxide

1.19 moles of sulfur dioxide would react with 1.19 * 16/8

= 2.38 moles

Hence the hydrogen sulfide is the limiting reactant

Now;

16 moles of hydrogen sulfide produces 3 moles of sulfur

2.24 moles of hydrogen sulfide would produce

2.24 * 3/16

= 0.42 moles

Mass of sulfur produced = 0.42 moles * 32 = 13.44 g

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The quotient of the given mathematical problem is equal to 2. Therefore, option A is correct.

In arithmetic, a quotient can be described as a quantity produced by the division of two numbers. The quotient has used throughout mathematics and is referred to as the integer part of a division or as a fraction or a ratio.

A rational number is the quotient of two integers when the denominator is non-zero.

A real number r is rational, it can be expressed as a quotient of two integers with a non-zero denominator.

Given a real number r, r is rational if and only if there exist integers a and b such that[tex]{\displaystyle r={\tfrac {a}{b}}}, {\displaystyle b\neq 0}[/tex]

Given, the division of √100/√25

We can write the [tex]\sqrt{100} =\sqrt{25\times 4} =\sqrt{25} \sqrt{4}[/tex]

Now, [tex]\displaystyle \frac{\sqrt{100}}{\sqrt{25}}= \frac {\sqrt{25}\times \sqrt{4} }{ \sqrt{25}} =\sqrt{4} =2[/tex]

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There are many factors that determine how a person can grow and develop, such as environmental factors, nutrition, genetics, and a good upbringing for better mental and physical development.

Many factors are required for a person's proper development, both mentally and physically, such as a child's upbringing, which helps a person make the right decisions in life, and nutrition and good genetics, which make a person physically strong.

Hence, there are many factors that determine how a person can grow and develop, such as environmental factors, nutrition, genetics, and a good upbringing for better mental and physical development.

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The most likely compound for the curve labeled C  is  sodium chloride according to the concept of solubility.

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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B. the volume of the gas to increase.

Thermal energy is the energy associated with the random motion of the particles in a substance, such as a gas. When thermal energy is added to a gas at constant pressure, the increased kinetic energy of the gas particles causes them to move apart, increasing the volume of the gas. This relationship is described by Gay-Lussac's Law, which states that at a constant pressure, the volume of a gas is directly proportional to its temperature.

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When you put it into a table and separate the variables, you'll get 0.80 molecules.

Answer: KCl

That is the correct answer on pearson