Use the given figure to complete the statement below.



∠1 and ∠2 are angles. ANSWERS -Obtuse complementary adjacent vertical

Answer:

Metallic cations from groups IA and IIA with non-metallic anions from groups VIA and VIIA.

Explanation:

Hello,

In this case, since you are not providing the elements, I'm bestowing you a strategy to predict such formation. In this case, the pair of elements most likely to form a salt are those that have a large difference in their electronegativities, it means, elements far away considering the periodic table, say metallic cations from groups IA and IIA with non-metallic anions from groups VIA and VIIA. Take into account that noble gases cannot form any compound as they do not have valence electrons. For instance, some examples are NaF, KI, CsBr and others.

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The mass of Fe₂O₃ that remains after the reaction has gone to completion is 0 grams.

In the given reaction,
Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g)

Co is the limiting reactant, and Fe₂O₃ is the reactant in excess.

To calculate the mass of Fe₂O₃ remaining after the reaction, we first need to calculate the amount of Co used in the reaction:
Given mass of Co = 63.0 g
Molar mass of Co = 28.01 g/mol
moles of Co = mass / molar mass = 63.0 g / 28.01 g/mol = 2.25 mol

The molar ratio between Co and Fe₂O₃ is 3:1, which means for every 3 moles of Co, 1 mole of Fe2O3 is used. Therefore, the moles of Fe₂O₃used in the reaction is equal to (2.25 mol Co * 1 mol Fe2O3 / 3 mol Co) = 0.75 mol Fe₂O₃.

Now, we can calculate the mass of Fe2O3 remaining:
Initial mass of Fe2O3 = 189 g
moles of Fe₂O₃ used = 0.75 mol
moles of Fe₂O₃ remaining = initial moles - moles used = 0.75 mol - 0.75 mol = 0 mol

Since the moles of Fe₂O₃remaining is 0, there is no Fe₂O₃ left after the reaction has gone to completion.

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When using the celestial coordinate system, all of the stars can be observed from any location on Earth is not true. Hence option A is correct.

Celestial coordinate system is defined as the structured ways to specify the positions of satellites, planets, stars, galaxies, and other celestial objects with relation to the physical reference points that an observer in a particular location may access. The horizon system (altitude and azimuth), galactic coordinates, and the ecliptic system are employed as coordinate systems.

The advantage of using this set of numbers is that you can see the sky turn by roughly one hour's worth of right ascension for every hour of time as the Earth revolves. This makes predicting when celestial objects will appear and disappear easier. The positions of objects on the celestial sphere are defined using a reference system called celestial coordinate.

Thus, when using the celestial coordinate system, all of the stars can be observed from any location on Earth is not true. Hence option A is correct.

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After magnesium loses 2 electrons, it becomes a magnesium ion with a charge of 2+, denoted as Mg2+.

If 2 electrons were removed from magnesium, the resulting charge on magnesium would be 2+. This occurs because magnesium is in group 2 of the periodic table and has two valence electrons. When these two electrons are removed, the magnesium atom becomes a magnesium ion (Mg2+), having two more protons than electrons, which gives it a net positive charge. In an ionic compound like magnesium chloride (MgCl2), this Mg2+ ion will typically bond with two chloride ions (Cl-), which each have a 1- charge, to achieve a neutral overall charge.

The chemical formula for lithium hydroxide is LiOH. It is formed by the combination of lithium ion (Li⁺) and hydroxide ion (OH⁻), making it a strong base.

Chemical Formula for Lithium Hydroxide:

The chemical formula for lithium hydroxide, a base, is LiOH. Lithium hydroxide is formed by reacting lithium (Li) with water (H₂O), resulting in the liberation of hydrogen gas (H₂) and the formation of lithium hydroxide. Lithium ion (Li⁺) and hydroxide ion (OH⁻) combine to form this ionic compound.

Here are some examples of similar strong bases and their chemical formulas:

Sucrose is insoluble in dichloromethane solution because the hydrogen bonds in sucrose are much more polar than the dipole-dipole interactions in dichloromethane.

Sucrose is an organic compound which is a disaccharide which is made up of glucose and fructose subunits. It has hydrogen bonds which are responsible for binding in the molecule. Dichloromethane is an organochlorine compound which is colorless and volatile in nature. Dichloromethane is insoluble in water because of the absence of hydrogen bonding.

Sucrose has hydrogen bonding which is much more polar than the dipole-dipole interactions which are present in the dichloromethane molecule. Thus, sucrose does not dissolve in dichloromethane solution.

Solubility of a substance is affected by four main factors which include temperature, pressure, polarity, and molecular interactions. Solubility of a substance increases with temperature for most of the solids which are dissolved in liquid water. This is because of the higher temperature which increases the kinetic energy of the solute molecules.

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The electronegativity of an atom indicates its ability to attract electrons towards itself in a chemical bond. It is a measure of the atom's tendency to gain or share electrons.

Electronegativity values range from 0 to 4, with higher values indicating a greater ability to attract electrons. Each atom has a characteristic electronegativity value associated with it. This value helps us understand how strongly an atom can attract electrons in a chemical bond.

When two atoms with different electronegativities bond together, the electron distribution in the bond becomes uneven. The atom with the higher electronegativity will pull the electrons closer to itself, creating a polar bond.

Thus, electronegativity of an atom indicates atom's tendency to gain or share electrons.

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We are given the chemical formula which is CCl4.

C stands for Carbon while Cl stands for Chloride (chlorine in neutral form).

Since there are four Cl in the formula, hence we say tetrachloride.

Therefore the answer is:

carbon tetrachloride

Its Carbon tetra chloride. Im taking the test :)

Three examples of liquid substances with large dipole-dipole attractions are water (H₂O), due to hydrogen bonding, hydrogen chloride (HCl), and acetonitrile (CH₃CN), both of which have significant differences in electronegativity between their respective atoms leading to strong dipole-dipole attractions.

Examples of Liquid Substances with Strong Dipole-Dipole Attractions

Dipole-dipole attractions occur when the positive end of a dipole molecule is attracted to the negative end of another. Substances with large dipole moments will exhibit stronger dipole-dipole attractions in the liquid state. Here are three examples of such substances:

Water (H₂O): Water molecules are polar, with a significant dipole moment due to the electronegativity difference between hydrogen and oxygen atoms. This leads to strong hydrogen bonding, a type of dipole-dipole interaction.

Hydrogen chloride (HCl): In the liquid state, HCl molecules exhibit strong dipole-dipole attractions due to the electronegativity difference between hydrogen and chlorine atoms.

Acetonitrile (CH₃CN): This substance has a relatively high dipole moment and consequently strong dipole-dipole attractions because of the polarity of the carbon-nitrogen triple bond.

These examples demonstrate how the characteristics of molecular structure directly affect the intermolecular forces present in a substance. Larger dipole moments yield stronger dipole-dipole attractions, affecting properties like boiling points and solubility.

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. The given statement is true.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

Among solid, liquid and gas, solid's particle are very fixed at their mean position. The structure of solids are very compact.  Particles do not move at all. There is no motion in the molecules or atoms of solid. whereas in gas and liquid particles are comparatively moveable.

Therefore, the given  statement is correct.

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The mass of sucrose in 1.55 L of a 0.758 M sucrose solution can be found by first determining the moles of sucrose present and then converting those moles to grams using the molar mass of sucrose. The calculation yields approximately 401.93 grams of sucrose in the solution.

The student is asking about the mass of sucrose in a specific volume of a sucrose solution with a given molarity. To find the number of grams of sucrose in a 1.55 L solution of 0.758 M sucrose, we first need to calculate the moles of sucrose present in the solution using the molarity (mol/L) and the volume of the solution (L). After calculating the number of moles of sucrose, we can then find the mass in grams using the molar mass of sucrose (C12H22O11), which is 342.30 g/mol.

This result provides the mass of sucrose in the given volume of the solution.

Answer : The frequency of the light is, [tex]2.0\times 10^{-5}m[/tex]

Explanation : Given,

Frequency of the light = [tex]1.50\times 10^{13}Hz[/tex]

Formula used :

[tex]\nu=\frac{c}{\lambda}[/tex]

where,

[tex]\nu[/tex] = frequency of light  = [tex]1.50\times 10^{13}Hz=1.50\times 10^{13}s^{-1}[/tex]

[tex]\lambda[/tex] = wavelength of light  = ?

c = speed of light = [tex]3\times 10^8m/s[/tex]

Now put all the given values in the above formula, we get the wavelength of the light.

[tex]1.50\times 10^{13}s^{-1}=\frac{3\times 10^8m/s}{\lambda}[/tex]

[tex]\lambda=2.0\times 10^{-5}m[/tex]

Therefore, the frequency of the light is, [tex]2.0\times 10^{-5}m[/tex]

The symbol for protons is p⁺, the symbol for electron is e⁻ and symbol for neutron is n⁰. The nucleus of every atom contains protons.

A proton is a subatomic particle with a defined mass of 1 and a charge of +1 (positive charge). The symbol for the proton is either p or p+. The nucleus of every atom contains protons. The number of protons of an atom of an element is its atomic number.

While the positive electrical charge of protons causes them to repel each other, when protons and neutrons get close enough to each other, the strong nuclear force overcomes electrostatic repulsion. This allows them to bind together. Protons, like neutrons, are hadrons. A proton consists of still smaller subatomic particles called quarks. The symbol for protons is p⁺, the symbol for electron is e⁻ and symbol for neutron is n⁰.

Therefore, the symbol for protons is p⁺, the symbol for electron is e⁻ and symbol for neutron is n⁰.

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The balanced chemical reaction for rusting of iron is [tex]\boxed{{\text{4Fe}}\left(s\right)+3{{\text{O}}_2}\left(g\right)\to2{\text{F}}{{\text{e}}_2}{{\text{O}}_{\text{3}}}\left(s\right)}[/tex] .

Further explanation:

The chemical reaction that contains an equal number of atoms of the different elements in the reactant as well as in the product side is known as a balanced chemical reaction. The chemical equation is required to be balanced to follow the Law of the conservation of mass.

Rusting of iron occurs when impure iron comes in contact with water, oxygen, and other oxidants. The extent of rusting increases in seawater due to the presence of salt in it. Rust consists of hydrated iron oxides and iron oxide-hydroxides.

The steps to balance a chemical reaction are as follows:

Step 1: Complete the reaction and write the unbalanced symbol equation.

In the rusting reaction, Fe reacts with [tex]{{\text{O}}_2}[/tex] to form [tex]{\text{F}}{{\text{e}}_2}{{\text{O}}_{\text{3}}}[/tex] . The physical state of Fe is solid, [tex]{{\text{O}}_2}[/tex]  is gas, [tex]{\text{F}}{{\text{e}}_2}{{\text{O}}_{\text{3}}}[/tex] is solid. The unbalanced chemical equation is as follows:

[tex]{\text{Fe}}\left(s\right)+{{\text{O}}_2}\left(g\right)\to{\text{F}}{{\text{e}}_2}{{\text{O}}_{\text{3}}}\left(s\right)[/tex]

Step 2: Then we write the number of atoms of all the different elements that are present in a chemical reaction in the reactant side and product side separately.

⦁ On reactant side,

Number of iron atoms is 1.

Number of oxygen atoms is 2.

⦁ On product side,

Number of iron atoms is 2.

Number of oxygen atoms is 3.

Step 3: Initially, we try to balance the number of other atoms of elements except for carbon, oxygen, and hydrogen by multiplying with some number on any side. To balance the number of iron atoms, multiply Fe by 2. Now the reaction is,

[tex]\boxed{\text{2}}{\text{Fe}}\left(s\right)+{{\text{O}}_2}\left(g\right)\to{\text{F}}{{\text{e}}_2}{{\text{O}}_{\text{3}}}\left(s\right)[/tex]

Step 4: After this, we balance the number of atoms of carbon and then hydrogen atom followed by oxygen atoms. To balance the number of oxygen atoms, multiply  [tex]{{\text{O}}_{\text{2}}}[/tex] by 3, Fe by 2 and [tex]{\text{F}}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}[/tex]  by 2. Now the reaction is,

[tex]\boxed{\text{4}}{\text{Fe}}\left(s\right)+\boxed3{{\text{O}}_2}\left(g\right)\to\boxed2{\text{F}}{{\text{e}}_2}{{\text{O}}_{\text{3}}}\left(s\right)[/tex]

Step 5: So the balanced chemical equation is given as follows:

[tex]{\text{4Fe}}\left(s\right)+3{{\text{O}}_2}\left(g\right)\to2{\text{F}}{{\text{e}}_2}{{\text{O}}_{\text{3}}}\left(s\right)[/tex]

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Answer details:

Grade: High School

Subject: Chemistry

Chapter: Chemical reaction and equation

Keywords: balanced chemical reaction, rusting of iron, Fe, O2, Fe2O3, solid, gas, 2, 3, 4, iron atoms, oxygen atoms, reactant side, product side, 4 Fe, 3 O2, 2 Fe2O3.

The balanced chemical equation for the reaction between the iron and oxygen to produce iron (iii) oxide is:

Chemical equation is a representation of chemical reaction with symbols and formula of the reactants and products taking part in the reaction.

All chemical equation must be balanced in order to validate the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

NOTE: An unbalanced equation simply means matter has been created or destroyed.

The equation for the reaction between iron and oxygen to produce iron (iii) oxide is given below:

Fe(s) + O₂(g) —> Fe₂O₃(s)

The above equation can be balance as follow:

Fe(s) + O₂(g) —> Fe₂O₃(s)

There are 2 atoms of O on the left side and 3 atoms on the right side. It can be balance by writing 3 before O₂ and 2 before Fe₂O₃ as shown below:

Fe(s) + 3O₂(g) —> 2Fe₂O₃(s)

There are 4 atoms of Fe on the right side and 1 atom on the left side. It can be balance by writing 4 before Fe as shown below:

4Fe(s) + 3O₂(g) —> 2Fe₂O₃(s)

Therefore, the balanced equation for the reaction between iron and oxygen to produce iron (iii) oxide is

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This plasma is most likely influenced by magnetic and electric fields. The massive positively charged ions which are influenced the lighter electrons than replace the ions to keep charge impartiality.

Therefore electric field influence the plasma. The movement of charged particles identical to a magnetic field line is not influenced. Plasma contains charged particles which are positive nuclei and negative electrons which can be molded and restricted by magnetic forces.

Alike iron filings in the closeness of a magnet, bits in the plasma will ensue magnetic field lines.

Answer is C)magnetic and electric fields.

Option 3, 23/11Na and 23/11Na+, have the most nearly identical atomic and molecular properties.

The pair of species with the most nearly identical atomic and molecular properties is option 3, 23/11Na and 23/11Na+.

The chemical equation of the neutralization reaction is:

[tex]NH_4Cl + NaOH \longrightarrow NaCl + NH_3 +H_2O[/tex]

Buffer Solution can be described as a water solvent-based solution that consists of a mixture of a weak base and the conjugate acid of the weak base or a weak acid and the conjugate base of the weak acid.

They prevent a change in pH upon dilution or the addition of small amounts of acid or alkali to them.

Acid buffer possesses acidic pH and is created by mixing a weak acid and its salt with a strong base. A basic buffer contains a basic pH and is prepared from a weak base and its salt with strong acid.

When NaOH is added to the buffer containing NH₄Cl and NH₃, sodium hydroxide consumes a proton from the ammonium ion from ammonium chloride to produce NaCl, ammonia, and water.

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A compound that consist of two elements in which elements are chemically combined in a fixed proportion.

Compounds:

They are made up of two or more than two elements when combine in a fixed ratio. One compound from all sources have same same constituent ratio.

Example:

In Water or [tex]\rm \bold{H_2O}[/tex] , ratio of Hydrogen and Oxygen is 2:1. If this ratio will change to 2:2 this become Hydrogen peroxide [tex]\rm \bold{H_2O_2}[/tex].

Water gives you life but  Hydrogen peroxide can kill you if you consume it.

Hence, we can conclude that a compound that consist of two elements in which elements are chemically combined in a fixed proportion.

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The subatomic particle with no charge is a neutron. Ions have a net charge because they have gained or lost electrons, and electrons themselves are negatively charged. The whole atom can be charged or neutral.

The subatomic particle that possesses no electrical charge is called a neutron. This is different from ions, which are atoms or molecules that have gained or lost one or more electrons, and thus have a net electrical charge. Electrons are subatomic particles that have a negative charge. Neutrons, along with protons, make up the atom's nucleus, or core. The atom itself is composed of a central nucleus surrounded by a cloud of electrons. However, the atom as a whole can be charged (an ion) or neutral, depending on whether it has equal numbers of electrons and protons.

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Group 1 elements, also known as alkali metals, are the most reactive metals due to having 1 valence electron.

The Group 1 elements are the most reactive metals because they have 1 valence electron. The valence electron is located in the outermost shell of an atom and is involved in chemical reactions. Since the Group 1 elements have only one valence electron, it is easier for them to lose this electron and form a positive ion, leading to their high reactivity.