HNO3 Express your answers as ions separated by a comma.

An example of a Physical Change is:

C. sugar dissolving in water

Physical Change:

To determine which of the options represents a physical change, it's important to understand the difference between physical and chemical changes:

1) Physical Change: A change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or dissolving), shape, or size.

2) Chemical Change: A change that results in the formation of new chemical substances. This often involves a reaction that alters the chemical structure of the original substance.

Let's analyze each option:

A. Wood Burning

Type: Chemical Change

Reason: Burning wood transforms it into ash, smoke, and gases, changing its chemical composition.

B. A Piece of Metal Rusting

Type: Chemical Change

Reason: Rusting involves the reaction of metal with oxygen, resulting in the formation of iron oxide, which is a different substance.

C. Sugar Dissolving in Water

Type: Physical Change

Reason: When sugar dissolves, it forms a solution but retains its chemical composition. No new substances are formed.

D. A Mineral Weathering to Form Another Mineral

Type: Chemical Change

Reason: Weathering often involves chemical reactions that change the mineral's composition.

The net ionic equation for the reaction of hydrochloric acid with sodium hydroxide is H⁺(aq) + OH⁻(aq) → H₂O(l), which shows the formation of water from hydrogen and hydroxide ions, ignoring the spectator ions sodium and chloride.

The net ionic equation for the reaction of hydrochloric acid with sodium hydroxide is as follows:

H⁺(aq) + OH⁻(aq) → H₂O(l)

In this equation, hydrochloric acid (HCl) dissociates into hydrogen ions (H⁺) and chloride ions (Cl⁻) when dissolved in water. Sodium hydroxide (NaOH) dissociates into sodium ions (Na⁺) and hydroxide ions (OH⁻).

The reaction between the hydrogen ions and hydroxide ions produces water (H₂O), and this is the net ionic equation for the reaction. Sodium (Na⁺) and chloride (Cl⁻) ions are present on both sides of the equation and they do not participate in the actual chemical change, so they are considered spectator ions and are not included in the net ionic equation.

In terms of energy, microwaves have the lowest energy, followed by IR-B, and with IR-A having the highest energy.

The energy of electromagnetic radiation is inversely proportional to its wavelength. In other words, shorter wavelengths have higher energy, and longer wavelengths have lower energy. Let's compare the energy of microwaves, IR-B, and IR-A:

1. Microwaves have longer wavelengths compared to both IR-B and IR-A. Their wavelengths typically range from 1 mm to 1 m. Microwaves have lower energy compared to both IR-B and IR-A.

2. IR-B falls in the range of 1400 to 3000 nm (1.4 to 3.0 micrometers). It has shorter wavelengths compared to microwaves but longer wavelengths than IR-A. Therefore, IR-B has higher energy than microwaves but lower energy than IR-A.

3. IR-A falls in the range of 700 to 1400 nm (0.7 to 1.4 micrometers). It has shorter wavelengths compared to both microwaves and IR-B. As a result, IR-A has the highest energy among the three – higher than microwaves and IR-B.

So, in terms of energy, the order is:

IR-A > IR-B > Microwaves

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In the molecule CH3Cl, the sigma bond between Carbon and Chlorine is formed by the overlap of an s orbital from Carbon and a p orbital from Chlorine.

The type of orbitals that overlap to form the sigma bond between Carbon (C) and Chlorine (Cl) in CH3Cl are an s orbital from Carbon and a p orbital from Chlorine. This overlap can occur as the Carbon has its electronic configuration ending in 2s2 2p2, meaning it has access to one s orbital and three p orbitals. Chlorine, on the other hand, has its electronic configuration ending in 3s2 3p5, meaning it has a partially filled p orbital. This overlap produces a sigma bond, a covalent bond in which the electron density is concentrated in the region along the internuclear axis.

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The carbon atom in difluoromethane (CH2F2), referred to as R-32, is surrounded by four electron domains, corresponding to its four bonds - two to hydrogen atoms and two to fluorine atoms.

In the molecule difluoromethane (CH2F2), there are four single bonds around the central carbon atom, namely, two to hydrogen atoms and two to fluorine atoms. Each of these bonds is considered an electron domain. Therefore, there are four electron domains around the carbon atom in this molecule.

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The force of attraction that holds two atoms together is called a "chemical bond". True.

In the periodic table, dots around an element's symbol indicate the number of valence electrons in an atom. True.

True or false? The force of attraction that holds two atoms together is called a "chemical bond".

The correct answer is true. Chemical bond is the term used to describe the attractive force between atoms that holds them together in a molecule or compound. This force can be either ionic, where one atom transfers electrons to another, or covalent, where atoms share electrons.

True or false? In the periodic table, dots around an element's symbol indicate the number of valence electrons in an atom.

The correct answer is true. The dots, also known as electron dot diagrams or Lewis dot structures, represent the valence electrons of an atom. Valence electrons are the electrons in the outermost energy level of an atom and are responsible for the atom's chemical behavior and reactivity.

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A chemical bond is formed through the sharing or transfer of electrons between atoms. The dots around an element's symbol in the periodic table indicate the number of valence electrons in an atom.

The force of attraction that holds two atoms together is indeed called a chemical bond. This bond is formed through the sharing or transfer of electrons between atoms. When atoms share electrons, it is called a covalent bond, while when electrons are transferred, it forms an ionic bond.

In the periodic table, the dots around an element's symbol, known as the valence electrons, indicate the number of electrons in the outermost energy level of an atom. These electrons are involved in the formation of chemical bonds. The number of valence electrons determines the reactivity and chemical properties of an element.

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The density of the unknown metal, calculated using the formula density = mass / volume with the given mass of 35.4 g and volume of 3.11 cm³, is 11.382 g/cm³.

To calculate the density of the unknown metal, you can use the density formula
which is density = mass / volume. Given that the mass of the metal is 35.4 g and the volume is 3.11 cm³, the calculation would be as follows:

Density = mass / volume
Density = 35.4 g / 3.11 cm³
Density = 11.382 g/cm³

Therefore, the density of the sample of the unknown metal is 11.382 g/cm³.

We are given the volume of the solution which is 80 mL or 0.08 L and the density which is equal to water, density = 1 kg / L.  Therefore calculate total mass:

total mass = (1 kg / L) * (0.08 L) = 0.08 kg = 80 g

So the mass of NaCl is:

mass NaCl = 0.0092 * 80 g = 0.736 g

The molar mass of NaCl is 58.44 g/mol, so the number of moles is:

moles NaCl = 0.736 g / (58.44 g/mol) = 0.0126 mol

SO the molarity is mol / L:

Molarity = 0.0126 mol / 0.08 L = 0.157 mol/L = 0.157 M

To calculate the molarity of the solution, convert the mass of NaCl to moles, determine the number of moles of ions, and calculate the molality.

To calculate the molarity of the solution, we need to first convert the mass of NaCl to moles using its molar mass. Then, we determine the number of moles of ions present in the solution. Finally, we use the number of moles of ions and the mass of solvent to calculate the molality of the solution. In this case, the molarity of the solution is 1.2 M.

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Considering the attached image;

Answer;

- Lithium (Li) and Flourine (F)

Explanation;

-(Li) Lithium and (F) Fluorine would create a binary ionic compound which would be lithium fluoride which would be (LiF). Lithium is an alkali metal in group 1 in the periodic table , while flourine is a halogen in group 7. Lithium reacts by loosing an electron while flourine reacts by gaining one electron. Therefore, they reacts forming LiF which is an ionic compound.

-They would create an ionic compound because lithium is a metal and fluorine is a nonmetal. Metal + Nonmetal = ionic compound.

We are converting aluminum bromide, a chemical, to grams. The mole is the fundamental unit of the substance. Albr3 would therefore weigh 266.693538 grams.

The statement is explained or further information is included in the sentence by using parentheses.

The two punctuation marks known as parentheses are most frequently employed to insert extraneous information or an aside into a phrase. The parentheses seem like two vertical curved lines.

A phrase, word, or sentence added to writing as supplemental information or an afterthought is known as a parenthesis. It is emphasized with bracketed text, commas, or dashes. He had been a fan of Rockingham Rovers since he was five years old, as an illustration.

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The IUPAC name for the given organic compound: CH₃CH₂CH(CH₃)CH₂CH₂OH is 3-methylhexan-2-ol.

IUPAC nomenclature refers to the chemical CH₃CH₂CH(CH₃)CH₂CH₂OH as 3-methylhexan-2-ol.

This term accurately describes its make-up: a six-carbon chain (hexane) with alcohol connected to the second carbon and a hydroxyl group (3-methyl) at the third carbon.

In order to precisely characterise organic compounds and enable unambiguous communication and identification of their structures, the IUPAC nomenclature adopts a systematic methodology.

Chemistry relies on this methodical naming strategy to describe and understand the precise atom arrangement within complicated compounds.

Thus, the answer is 3-methylhexan-2-ol.

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Your question seems incomplete, the probable complete question is:

"Identify the IUPAC name for the following organic compound: CH₃CH₂CH(CH₃)CH₂CH₂OH. Be sure to use correct punctuation and formatting."

thx but it's actually 143

Answer : The moles of chlorine present in 140 grams of chlorine gas are 3.96 moles.

Explanation : Given,

Mass of [tex]Cl_2[/tex] = 140 g

Molar mass of [tex]Cl_2[/tex] = 70.9 g/mol

Formula used :

[tex]\text{Moles of }Cl_2=\frac{\text{Mass of }Cl_2}{\text{Molar mass of }Cl_2}[/tex]

Now put all the given values in this formula, we get:

[tex]\text{Moles of }Cl_2=\frac{140g}{70.9g/mol}[/tex]

[tex]\text{Moles of }Cl_2=1.98mol[/tex]

The number of moles of chlorine in [tex]Cl_2[/tex] = 2 × 1.98 = 3.96 mole

Therefore, the moles of chlorine present in 140 grams of chlorine gas are 3.96 moles.

The number of Hg atoms present in 1.0 ×10⁻¹⁰ mol of mercury is 6.022 × 10¹³.

Avogadro’s number can represent the number of particles in one mole of any substance. Generally, these particles can be molecules, atoms, ions, electrons, or protons, which depends upon the type of chemical reaction or their reactant and product.

The value of Avogadro’s number is approximately equal to 6.022 × 10²³ per mol.

Given, the number of moles of mercury (Hg) =  1.0 ×10⁻¹⁰ mol

The number of Hg atoms of mercury in one mole = 6.022 × 10²³ atoms

Then 1.0 ×10⁻¹⁰ mol of mercury will have atoms = 6.022 × 10²³ × 1.0 ×10⁻¹⁰

The number of atoms of mercury =  6.022 × 10¹³ Hg atoms

Therefore, the number of Hg atoms present in 1.0 ×10⁻¹⁰ mol of mercury is equal to  6.022 × 10¹³.

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An aluminum ion, Al³+, is formed from a neutral aluminum atom by losing three electrons.

An aluminum ion, Al³+, is formed from a neutral aluminum atom by losing three electrons. The atomic number of aluminum is 13, so it has 13 protons. When it loses three electrons, it becomes a cation with a positive charge of 3+. The equation for the formation of an aluminum ion is:

Al → Al³+ + 3e-

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The pH is neutral at the equivalence point during the titration of a strong acid with a strong base, resulting in a pH of 7.0.

The pH will be neutral at the equivalence point for a titration involving a strong acid and a strong base. At the equivalence point in such a titration, equimolar amounts of acid and base have been mixed, resulting in the formation of a salt and water, without excess hydronium (H+) or hydroxide (OH-) ions, which leads to a neutral pH of 7.0. The indicator chosen for this titration should change color at a pH of 7.0 to signify the end point.

For titrations involving a weak acid or weak base, the pH at the equivalence point is not neutral. In these cases, the resulting salt can affect the pH, either making the solution slightly acidic or basic. Therefore, the pH at the equivalence point for such titrations depends on the specific acid and base being used.

Answer: Option (b) is the correct answer.

Explanation:

As it is known that both sodium and potassium are same group elements. Both of then belongs to group 1A.

Since, sodium is at 11th position in the periodic table and its atomic number is also 11. Therefore, electronic distribution of sodium is 2, 8, 1.

Similarly, potassium is placed at 19th position in the periodic table and its atomic number is 19. So, electronic distribution of potassium is 2, 8, 8, 1.

It is known that valence electrons are the electrons present in the outermost shell of an atom.

So, in a potassium atom there is only one valence electron is present.

Thus, we can conclude that potassium have 1 valence electron.

Answer: The element is Strontium.

Explanation:

Atomic number is defined as the number of electrons or number of protons that are present in an element.

Atomic number = Number of protons = Number of electrons

If an element has a positive charge, it means that the electrons are lost which were earlier present.

Thus, the total number of electrons in the given element becomes = 36 + 2 = 38

And the element which has 38 electrons means that it has an atomic number of 38.

Hence, the element is Strontium.

The molecular formula of the compound of sulfur and fluorine is [tex]\boxed{{{\text{S}}_2}{{\text{F}}_2}}[/tex].

Further Explanation:

Empirical formula:

It is atom’s simplest positive integer ratio in compound. It may or may not be the same as that of molecular formula. For example, empirical formula of disulfur dioxide is [tex]{\text{SO}}[/tex].

Molecular formula:

It is chemical formula that indicates the total number and kinds of atoms in molecule. For example, molecular formula of disulfur dioxide is [tex]{{\text{S}}_2}{{\text{O}}_2}[/tex]

Step 1: Mass of sulfur (S) and fluorine (F) is to be calculated. This is done by using equation (1).

Since the given compound contains only sulfur and fluorine. So the mass of sulfur is calculated as follows:

[tex]{\text{Mass of sulfur}}\left( {\text{S}} \right) = {\text{Mass of compound}} \times {\text{percentage of Sulfur}}[/tex]      ......(1)

The mass of the compound is 102.13 g/mol.

The percentage of sulfur is 62.79 %.

Substitute the values in equation (1).

[tex]\begin{aligned}{\text{Mass of sulfur}}\left( {\text{S}} \right) &= 102.13{\text{ g/mol}} \times 62.79{\text{ }}\%\\&= 102.13{\text{ g/mol}} \times \frac{{62.79}}{{100}}\\&= 64.13{\text{ g/mol}}\\\end{aligned}[/tex]

The mass offluorine (F) is calculated as follows:

[tex]{\text{Mass of fluorine}}\left( {\text{F}} \right) = {\text{Mass of compound}} - {\text{Mass of sulfur}}\left( {\text{S}} \right)[/tex]   ......(2)

Substitute 102.13 g/mol for mass of the compound and 64.13 g/mol for mass of sulfur in equation (2).

[tex]\begin{aligned}{\text{Mass of fluorine}}\left({\text{F}} \right) &= {\text{102}}{\text{.13 g/mol}} - {\text{64}}{\text{.13 g/mol}}\\&= 38{\text{ g/mol}}\\\end{aligned}[/tex]

Step 2: The number of sulfur (S) and fluorine (F) in the compound is to be calculated.

The formula to calculate the number of sulfur (S)atoms in the molecule is as follows:

[tex]{\text{Number of S}} = \dfrac{{{\text{Given mass of S}}}}{{{\text{Molar mass of S}}}}[/tex]                              ......(3)

The given mass of S is 64.13 g/mol.

The molar mass of S is 32 g/mol.

Substitute these values in equation (3).

[tex]\begin{aligned}{\text{Number of S}} &= \frac{{{\text{64}}{\text{.13 g/mol}}}}{{{\text{32 g/mol}}}} \\&\approx 2\\\end{aligned}[/tex]

The formula to calculate the number of fluorine (F) atoms in the molecule is as follows:

[tex]{\text{Number of F}} = \dfrac{{{\text{Given mass of F}}}}{{{\text{Molar mass of F}}}}[/tex]                      ......(4)

The given mass of F is 38 g/mol.

The molar mass of F is 19 g/mol.

Substitute these values in equation (4).

[tex]\begin{aligned}{\text{Number of F}} &= \frac{{{\text{38 g/mol}}}}{{{\text{19 g/mol}}}}\\&= 2\\\end{aligned}[/tex]

Hence the molecular formula of the given compound is [tex]{{\mathbf{S}}_{\mathbf{2}}}{{\mathbf{F}}_{\mathbf{2}}}[/tex].

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Stoichiometry of formulas and equations

Keywords: empirical formula, S, F, SF, S2F2, subscript, moles of F, moles of S, mass of S, mass of F and molecular formula.

Answer:

B

Explanation: If it has a positive trait it will have more energy or more etc.