How are elements arranged on the periodic table?(1 point)

The substance with stronger surface tension when in the liquid state between methane (CH4) and silane (SiH4) is silane (option b).

Surface tension is a property that describes the cohesive forces between molecules at the surface of a liquid.

Silane (SiH4) has a stronger surface tension compared to methane due to the presence of silicon (Si) atoms. Silicon atoms have larger atomic size and higher atomic mass compared to carbon (C) atoms in methane. These factors contribute to stronger intermolecular forces, resulting in increased surface tension.

In general, surface tension is influenced by factors such as molecular size, intermolecular forces, and molecular shape. The presence of larger atoms or molecules and stronger intermolecular forces tends to enhance surface tension. Silane, being a larger molecule with silicon atoms, experiences stronger intermolecular forces compared to methane, which consists of smaller carbon atoms.

Therefore, silane exhibits higher surface tension when in the liquid state.

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Answer:

Acidic oxide, so², So³, Co², Cl²O7

Basic oxide: CaO, MgO, Na O

Explanation:

An oxide that combines with water to give an acid is termed as an acidic oxide. The oxide that gives a base in water is known as a basic oxide.

Answer:

Answer:K subscript e q equals StartFraction StartBracket upper C upper O subscript 2 EndBracket StartBracket upper C a upper O EndBracket over StartBracket upper C a upper C upper O subscript 3 EndBracket EndFraction

Explanation: the answer has it's root in Law of mass action which states that; the rate of a chemical reaction is directly proportional to the product of the concentrations of the reactants raised to their respective stoichiometric coefficients.

The equilibrium constant expression for the given system of reaction is \(K_c = \frac{ [CH_3OH]}{ [CO][H_2]^2}\)

An equilibrium constant can be defined as an expression that shows the relationship between the reactants and products of a chemical reaction that is at equilibrium with respect to a specific unit.

Mathematically, the equilibrium constant is given by this formula:

\(K_c = \frac{ [C]^c[D]^d}{ [A]^a[B]^b}\)

Where:

First of all, we would write the properly balanced chemical equation with the phase for this system of chemical reaction:

                         CO(g) + 2H₂(g) ⇆ CH₃OH(g)  

Substituting the parameters into the formula, we have;

\(K_c = \frac{ [CH_3OH]}{ [CO][H_2]^2}\)

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Answer:

About 7.109g

Explanation:

25000mL is the same as 25 liters.

\(PV=nRT \\\\0.5 (25)=n (0.0821) (300) \\\\n\approx 0.508\)

Multiplying this by the molar mass of nitrogen, you get about 7.109 grams of nitrogen. Hope this helps!

In the compound iodine heptafluoride: (hints: write out the molecular formula of this compound before answering the question. Also be sure you clearly understand the concepts of charge, oxidation numbers, how to determine charge and oxidation numbers, and - most important of all! - the similarities and the differences between charges and oxidation numbers)

Each fluorine atom has a charge of 1

The interhalogen compound iodine heptafluoride, often known as iodine(VII) fluoride or iodine fluoride, has the chemical formula IF7.   As anticipated by VSEPR theory, it exhibits a unique pentagonal bipyramidal structure.  The molecule is capable of undergoing the Bartell process, a pseudorotational rearrangement that is similar to the Berry mechanism but for a heptacoordinated system.  It produces colorless crystals that melt at 4.5 °C and have a very narrow liquid range with a boiling point of 4.77 °C. The dense mist has an unpleasant, musty smell. The molecule is symmetrical with D5h. suggestion

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Answer:

Oxygen

Explanation:

The 1st 2 are compounds

The last one "air" can be used to say oxygen, however, "air" is not on the periodic table of elements.

Oxygen is on the periodic table of elements

An atom is the submicroscopic particle that constitutes the fundamental building block of ordinary matter.

Everything that takes up space and has mass is considered to be matter. Atoms are the minuscule constituents of matter. Therefore, these atoms are thought of as the fundamental units of matter. They are frequently referred to as subatomic particles because they are what make up atoms. There are three subatomic particles: protons, neutrons, and electrons.

Atoms are the basic building blocks of matter and make up all matter at its most basic level. These atoms frequently come together to create molecules, which are made up of two or more atoms connected to one another in particular geometric configurations.

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Answer: Yes, I think light can cause the plastic to melt, as long as the energy from the light is absorbed by the plastic.  

Explanation:

Visible light will not melt the plastic because the energy does not pass through the plastic, it reflects off ensuring that the plastic does not absorb the energy. X-ray light is transmitted through the plastic, unlike the visible light, but the energy still isn't absorbed by it. The infrared light is the only one left, it is absorbed by the plastic allowing it to change and melt the material, unlike the visible and x-ray lights.

The plastic will melt if the energy from the light is absorbed by the plastic.  

These are forms of electromagnetic waves which propagate through space

and carry electromagnetic radiant energy. Examples include:

Visible light and X-ray light won't melt the plastic as a result of the energy

not being absorbed whereas in the case of Infrared lights, the energy is

absorbed which will led to the melting of the plastic.

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46.03 grams of iron and 19.75 grams of oxygen gas reacted to form 65.6 grams of Fe2O3.

What is Moles?

In chemistry, a mole is a unit of measurement that represents a certain amount of a substance. One mole of any substance is equal to 6.022* \(10^{23}\) particles (atoms, ions, etc.), which is known as Avogadro's number. The number of moles of a substance is determined by dividing the mass of the substance by its molar mass, which is the mass of one mole of the substance.

The balanced chemical equation is:

4Fe + 3O2 → 2Fe2O3

From the equation, we can see that 4 moles of Fe react with 3 moles of O2 to produce 2 moles of Fe2O3.

To find out how many grams of Fe and O2 reacted to form 65.6 grams of Fe2O3, we first need to calculate the number of moles of Fe2O3 produced:

molar mass of Fe2O3 = 2 x atomic mass of Fe + 3 x atomic mass of O = 2 x 55.845 + 3 x 15.999 = 159.685 g/mol

moles of Fe2O3 = mass of Fe2O3 / molar mass of Fe2O3

moles of Fe2O3 = 65.6 g / 159.685 g/mol

moles of Fe2O3 = 0.411 mol

From the balanced chemical equation, we know that 2 moles of Fe2O3 are produced from 4 moles of Fe and 3 moles of O2. Therefore, the number of moles of Fe and O2 that reacted can be calculated as follows:

moles of Fe = (4/2) x moles of Fe2O3

moles of Fe = 2 x 0.411 mol

moles of Fe = 0.822 mol

moles of O2 = (3/2) x moles of Fe2O3

moles of O2 = 1.5 x 0.411 mol

moles of O2 = 0.617 mol

Finally, we can calculate the mass of Fe and O2 that reacted:

mass of Fe = moles of Fe x atomic mass of Fe

mass of Fe = 0.822 mol x 55.845 g/mol

mass of Fe = 46.03 g

mass of O2 = moles of O2 x molar mass of O2

mass of O2 = 0.617 mol x 32.00 g/mol

mass of O2 = 19.75 g

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molar mass= energy x mass= 10 x 2.55 x 10^-23

Avogadro's number (NA) or Avogadro's constant (6.0221 x 10^23). The term "mole" is defined as that one mole of a substance with a molecular (or atomic) mass of one (1), will have a mass of 1 gram.

The number of molecules in one mole is 6.022 * 10^ 23 numbers. The molecular mass of the molecule is 2.55 x 10^-23

Molar mass can be defined as 'mass per mole.' In other words, molar mass is the sum of the mass of all the atoms found in one mole's worth of a substance. It is expressed in units of grams per mole.

Molar mass is depicted for elements or molecules. In the case of single elements or individual atoms, the molar mass would just be the element's mass expressed in atomic mass units.

Molar mass =  2.55 x 10^-23/ 6.022 * 10^ 23

                   = 0.423

Therefore, Avogadro's number (NA) or Avogadro's constant (6.0221 x 10^23). The term "mole" is defined as that one mole of a substance with a molecular (or atomic) mass of one (1), will have a mass of 1 gram.

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The mass of carbon dioxide released during the reaction is 2.6 grams.

To determine the mass of carbon dioxide released during the reaction between sodium hydrogen carbonate (NaHCO3) and acetic acid (CH3COOH), we need to calculate the difference in mass before and after the reaction.

Before the reaction:

Mass of NaHCO3 = 3.8 g

Mass of acetic acid = 10.5 g

Total mass before the reaction = Mass of NaHCO3 + Mass of acetic acid = 3.8 g + 10.5 g = 14.3 g

After the reaction:

Mass of the contents of the reaction vessel = 11.7 g

To find the mass of carbon dioxide released, we calculate the difference in mass:

Mass of carbon dioxide released = Total mass before the reaction - Mass of the contents of the reaction vessel

= 14.3 g - 11.7 g

= 2.6 g

Therefore, the mass of carbon dioxide released during the reaction is 2.6 grams.

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When the size of the cation and anion in an ionic crystal are quite different, the crystal structure will depend on the relative size of the ions.

In general, larger ions will tend to adopt a more open structure with larger inter-ionic distances. For example, in a crystal containing large cations and small anions, the cations will tend to occupy the larger interstitial sites in the crystal lattice, with the anions arranged around them. This type of structure is known as a "rock salt" or "sodium chloride" structure, and is characterized by a simple cubic arrangement of ions. In other cases, the anions may form a close-packed arrangement, with the cations occupying the smaller interstitial sites. This type of structure is known as a "zinc blende" structure, and is also characterized by a cubic arrangement of ions, but with a more complex arrangement of the smaller ions in the interstitial sites. Overall, the structure of ionic crystals with different sized cations and anions will depend on a variety of factors, including the relative size of the ions, their charges, and the strength of the electrostatic interactions between them.

In ionic crystals, the structure is determined by the arrangement of cations and anions held together by electrostatic forces. When the sizes of the cation and anion are quite different, the smaller cation tends to fit into the interstices or voids created by the larger anions. This results in a coordination number based on the size ratio, influencing the overall crystal structure. Common structures include cubic, tetragonal, and hexagonal systems. The stability of these structures depends on factors such as lattice energy and electrostatic forces, ultimately creating diverse and unique ionic crystal configurations.

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According to the research, the correct answer is that inner core and the outer core are geological layers of the Earth, which are similar in composition and both are extremely hot.

It refers to the innermost sector of the planet, being the layer formed mainly by iron and nickel whose internal pressure is higher than the pressure of the earth's surface.

In this sense, the inner core and outer core of the Earth are composed of iron-nickel or alloys thereof, with some other elements exhibiting high temperatures but unlike the solid inner core of the Earth, the outer core is liquid since there is not enough pressure to keep it in a solid state.

Therefore, we can conclude that according to the research, a wide range of concentrations of iron and nickel is found in the outer and inner core of the Earth.

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Answer:

high density, malleable, ductile, can corrode, good conductors,

Explanation:

gold's density is 19.3 g/cc compared to something like water which is 1g/cc

aluminum is extremely malleable, it can be flattened into thin sheets

copper can be formed into complex forms without breaking like wire, instruments, and bed frames

steel can get corroded by the oxygen particles in the air if it stays out too long.

copper is an excellent example of a conductor, it is used to make wires which conduct electricity that brings "power" into things like lights, computers, and TVs

Mg₂₅F₅₂ would never be a chemical formula because it violates the principles of chemical nomenclature, which requires that chemical formulas be written in the simplest, most reduced form possible.

This means that subscripts must be reduced to their lowest whole number ratio, which is achieved by dividing all subscripts by their greatest common factor.

In the case of Mg₂₅F₅₂, both subscripts are divisible by 2, resulting in the simpler and more reduced formula of Mg₁₂.₅F₂₆. Similarly, if there were any other common factors between the subscripts, they would also need to be reduced to the lowest possible whole number ratio.

Additionally, it is unlikely that a compound with such a large formula unit would exist, as it would have an extremely high molecular weight and be difficult to synthesize and study experimentally.

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Yes, 1-hexene exhibits cis/trans isomerism. 1-hexene is a type of aliphatic olefin, an unsaturated hydrocarbon

Isomerism refers to a phenomenon where two or more compounds have the same molecular formula but a different structure, resulting in different chemical and physical properties . Isomers may be classified into two types based on the arrangement of atoms within the molecule. They are as follows:      

Cis-isomers:  These isomers have the same functional groups on the same side of the molecule. They have lower boiling points and higher melting points compared to trans isomers.The term "cis" is Latin for "on the same side."

Trans-isomers:  These isomers have the same functional groups on opposite sides of the molecule. They have higher boiling points and lower melting points than cis isomers.The term "trans" is Latin for "across."

1-hexene is a type of aliphatic olefin, an unsaturated hydrocarbon. It is a six-carbon alkene that contains a double bond between carbon atoms one and two (1-hexene). The molecular formula of 1-hexene is C₆H₁₂. 1-hexene has two isomers - cis and trans.  Therefore, it displays cis/trans isomerism.

The hydrogen atoms are on the same side of the double bond. The hydrogen atoms are on opposite sides of the double bond.

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Answer:

The atom

Explanation:

The solubility of the given solutes in the corresponding solvents is as follows:

1. Enamel paint is not soluble in water (X).
2. Flour is not soluble in oil (X).
3. Salt is soluble in vinegar (√).
4. Sugar is soluble in water (√).
5. Powdered milk is soluble in hot water (√).

Enamel paint-water: X

Enamel paint is not soluble in water. Enamel paint consists of pigments dispersed in a binder, which is typically an oil-based medium. Since oil and water do not mix, enamel paint does not dissolve or disperse in water. Instead, it forms a separate layer or suspension when mixed with water. Therefore, the solubility of enamel paint in water is considered to be insoluble (X).

Flour-oil: X

Flour is not soluble in oil. Flour is composed mainly of starch, which is a complex carbohydrate. Carbohydrates are generally polar molecules, meaning they have partial positive and negative charges. On the other hand, oil is a nonpolar substance. Due to the difference in polarity, flour does not dissolve in oil. Instead, it forms clumps or a suspension in the oil. Hence, the solubility of flour in oil is considered to be insoluble (X).

Salt-vinegar: ✓

Salt is soluble in vinegar. Vinegar is an aqueous solution of acetic acid. Salt, or sodium chloride (NaCl), is an ionic compound composed of positive sodium ions (Na+) and negative chloride ions (Cl-). When salt is added to vinegar, the positive and negative ions of salt dissociate and are surrounded by the solvent molecules of vinegar. This process is known as solvation or dissolution. Therefore, salt dissolves in vinegar, making it soluble.

Sugar-water: ✓

Sugar is soluble in water. Sugar, or sucrose, is a polar compound composed of carbon, hydrogen, and oxygen atoms. Water is also a polar molecule. When sugar is added to water, the polar water molecules attract the polar sucrose molecules, causing them to dissociate and become surrounded by water molecules. This process results in the dissolution or solvation of sugar in water. Therefore, sugar is soluble in water.

Powdered milk-hot water: ✓

Powdered milk is soluble in hot water. Powdered milk is a dehydrated form of regular milk, consisting of milk solids. When powdered milk is added to hot water, the heat causes the milk solids to dissolve and disperse in the water. The hot water molecules provide energy for the dissolution process. As a result, powdered milk dissolves in hot water, making it soluble.

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Only III is the correct answer as alkyl halide III allows for an E2 elimination to form the desired alkene.

In order to determine which alkyl halide(s) would give a specific alkene as the only product in an elimination reaction, we need to consider the mechanism of the reaction and the conditions under which it takes place.

Elimination reactions typically involve the removal of a leaving group (usually a halogen) and a proton from adjacent carbons to form a new pi bond. The most common types of elimination reactions are E1 and E2.

In an E1 reaction, the leaving group is first dissociated to form a carbocation, followed by the removal of a proton to form the alkene. In an E2 reaction, the leaving group is removed simultaneously with the deprotonation.

Based on the given information that the elimination product is an alkene, we can deduce that the reaction follows an E2 mechanism since E1 reactions generally lead to carbocation rearrangements and the formation of mixtures of products.

Now, let's analyze the options provided:

A) II and III

B) Only II

C) Only III

D) Only I

Since there is no alkyl halide labeled as "I" in the given options, we can eliminate option D.

For the reaction NH2 (2 equivalents) Br Br, it suggests that two equivalents of ammonia (NH2) are used. This indicates that the reaction is likely to be an E2 reaction, where two molecules of ammonia would act as the base to remove the two bromine atoms.

Based on this analysis, the correct answer is option C) Only III, as the alkyl halide labeled as "III" is the only option that allows for an E2 elimination to occur, leading to the formation of the desired alkene as the only product.

It is important to note that a more comprehensive analysis may be required, considering other factors such as steric hindrance, the presence of different leaving groups, and the strength of the base to make a definitive determination.

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Answer:

acetone evaporates faster than hexane.

Explanation:

because acetone does nor participate in hydrogen bonding, so it's intermolecular forces are comparatively weaker, and it evaporates most quickly.

Meg's obstacle course in gym class is 60 yards long, consisting of running 100 feet, crawling through a 20-foot tunnel, and dribbling a soccer ball 60 feet to the finish line

To find out how many yards long the obstacle course is, we need to add up the distance Meg runs, crawls, and dribbles.

First, she runs 100 feet, which is equivalent to 33.33 yards (since 1 yard = 3 feet). Then, she crawls through a 20-foot tunnel, which is equivalent to 6.67 yards.

Finally, she dribbles a soccer ball 60 feet, which is equivalent to 20 yards. Therefore, the total distance of the obstacle course is 33.33 yards + 6.67 yards + 20 yards = 60 yards.

The obstacle course that Meg is doing in gym class consists of running, crawling, and dribbling. She starts by running 100 feet and jumping over a hurdle, which is equivalent to 33.33 yards. Next, she crawls through a 20-foot tunnel, which is equivalent to 6.67 yards.

Finally, she dribbles a soccer ball 60 feet to the finish line, which is equivalent to 20 yards. To determine the total length of the obstacle course, we add up the distance of each segment, which equals 60 yards.

Therefore, the obstacle course that Meg is doing is 60 yards long.

Meg's obstacle course in gym class is 60 yards long, consisting of running 100 feet, crawling through a 20-foot tunnel, and dribbling a soccer ball 60 feet to the finish line. We can calculate the total distance by converting each segment's length to yards and adding them up.

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Answer:

Ionization energy : energy required to take out an electron from the valance orbital of an atom.

Electron affinity: electron affinity of an atom measures the amount of energy released when an electron is forcibly entered or pushed into the valence orbital of an atom.

Ionization energy is the energy required to make an atom into a positive ion. Electron affinity is the energy released when an atom becomes a negative ion.

ionization energy is what is required to remove one electron from a normal gaseous atom to produce a +1 anion of that atom.

electron affinity is the energy required to remove one electron from a gaseous -1 anion of an atom to produce a normal gaseous atom.

Answer:

2.78035217*10^6 m

Explanation:

C = v

3.0e8 = (107.9)

= 2.78035217*10^6 m

The number of moles of  C6H18O3 that can be formed is 2 and 264grams of CO2 can be formed from C6H18O3.

Given the substance C6H18O3

Mass of C6H18O3 available (m) = 22.73decagrams = 227.3g

Molar mass of C6H18O3 (M) = 131.28g/mol

We know that number of moles is taken as = mass of substance/Molar mass of that substance

So, number if moles of C6H18O3 = 227.3/138.21 = 1.72

From the reaction: C6H18O3 + 9O2 → 6CO2 + 9H2O

We can see that for every 1 mole of C6H18O3 6 moles of CO2 is formed.

So the mass of CO2(carbon dioxide) used is calculated as:

mass = moles of CO2 x Molar mass of CO2

Molar mass of CO2 = 44g/mol

mass of CO2 = 6 x 44 = 264g

Hence the required mass of CO2 is 264g

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Answer:

Ammonia and oxygen without catalyst | NH3 + O2 → N2 + H2O. With supply of heat, ammonia reacts with oxygen and produce nitrogen gas and water as products. Nitrogen of ammonia is oxidized to nitrogen gas from -3 oxidation state to 0 oxidation state.

Explanation:

The work energy, w, gained or lost by the system when a gas expands from 20 L to 35 L against a constant external pressure of 2.0 atm is B) -3.0 kJ.

To calculate the work energy, W, during a gas expansion, you can use the following formula:

W = -P_ext * (V_final - V_initial)

where P_ext is the constant external pressure (2.0 atm), V_final is the final volume (35 L), and V_initial is the initial volume (20 L).

W = -2.0 atm * (35 L - 20 L)
W = -2.0 atm * 15 L
W = -30 L-atm

Now, convert L-atm to Joules using the provided conversion factor (1 L-atm = 101.1 J):

W = -30 L-atm * (101.1 J / 1 L-atm)
W = -3033 J

Finally, convert Joules to kJ:

W = -3033 J * (1 kJ / 1000 J)
W = -3.033 kJ

Since the work energy is negative, it means the system has lost energy. Rounded to one decimal place, the answer is -3.0 kJ (Option B).

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