H2Se(g) + 4 O2F2(g) SeF6(g) + 2 HF(g) + 4 O2(g)
30. Which of the following is true regarding the reaction represented above?
(A) The oxidation number of O does not change.
(B) The oxidation number of H changes from −1 to +1.
(C) The oxidation number of F changes from +1 to −1.
(D) The oxidation number of Se changes from −2 to +6.
(E) It is a disproportionation reaction for F.

The property that will be least helpful in the determination of the bond type that has the strongest intermolecular forces is C. Conductivity in water.

It should be noted that the students wanted to investigate whether ionic or covalent bonds have stronger intermolecular forces.

In order to carry out the investigation, salt, sugar, and molar balls are used. Based on this, the property that is required for the investigation will be flammability, solubility in water, and the melting point.

The conductivity in water isn't required.

Distillation is the separation of multiple liquids. it means the selective boiling and subsequent condensation of a component in a liquid mixture.

Distillation It is a separate technique that can be used either to increase the concentration of a particular component in a mixture or to obtain pure components from a mixture.

The process of distillation takes advantage of the difference in boiling points of the components in a liquid mixture by converting one of them into a gaseous state. Distillation is not a chemical reaction but can be considered a physical separation process.

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Answer:

C I think, haven't done this in awhile

Explanation:

I took science

Balanced molecular chemical equation for the reaction of solid copper with aqueous lead(ii) nitrate is then there is no reaction so there is no copper

Chemical equation is a representation of a chemical reaction using symbols of the elements to indicate the amount of substance usually in moles of each reactant and product and solid copper with aqueous lead(ii) nitrate then there is no reaction between copper and lead nitrate solution and this is because copper is less reactive than lead

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Answer: The valence shell electrons are represented by crosses.

Explanation:

The outer shell of each atom is drawn as a circle. Electrons from one atom are shown as dots, and electrons from other atoms are shown as crosses. The circles overlap where covalent bonds are present.

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The enthalpy of solution ∆H is positive when CH3CN dissolves in formaldehyde. Use this information to list the stages in order of increasing enthalpy A<D<B<C.

The net result of the energy absorbed or dissipated as heat by the solution when a given amount of solute is dissolved in a solvent at constant pressure. The amount of heat released or absorbed when a substance melts is not constant. It depends on the final solute concentration.

The enthalpy of a solution is expressed in kJ/mol at a nearly constant temperature. The energy change can be viewed as consisting of three parts endothermic bond breaking in the solute and solvent and the formation of an attractive force between the solute and solvent. The enthalpy of a solution describes the total amount of heat absorbed or released when two substances go into the solution. This sum can be either positive or negative.

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The heat capacity values obtained will be too low due to the heat lost.

The heat capacity of a substance is the amount of heat required to raise the unit mass of that substance by one-degree celsius.

In order to determine the heat capacity of a substance, the method of calorimetry is used.

In the method of calorimetry, it is assumed that no heat is lost during the process.

The principle states that the heat lost is equal to the heat gained.

Hence, if heat is lost from the calorimeter during the process of determining the heat capacity of a substance, the heat capacity value will be lower than the actual values.

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Energy as the ability to do work.

What is energy?

Energy has been defined as the ability to do work. Modern civilization is possible because people have learned how to change energy from one form to another and then use it to do work. People use energy to walk and for bicycle, to move cars along roads and boats through water, to cook food on stoves, to light our homes and offices, to manufacture products.

There are different forms of energy, which may include:

These forms of energy can be grouped into two general types;

Explanations

1. This is called convection.

2. You are using chemical energy and converting it to thermal (heat) energy.

3. Kinetic energy is the important factor

4. A hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are generally colourless and hydrophobic, and their odors are usually weak or exemplified by the odors of gasoline. Examples of hydrocarbons are coal, petroleum, natural gas and tar. They are used as energy sources.

5. Radioactive waste. These materials can remain radioactive and dangerous to human health for thousands of years.

6. Mercury.

7. The energy of the sun is the original source of most energy used on Earth.

8. Heat is released and this heat expended allows work to be done.

9.

10.

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The process that is not a way for carbon dioxide to reach the atmosphere is Photosynthesis; option C

The carbon cycle is a biogeochemical cycle that describes the processes by which carbon is recycled between the living and non-living components of the environment.

The processes by which carbon is removed from the atmosphere and the processes by which carbon is returned to the atmosphere work together to ensure there is a balance of carbon in the environment.

The processes by which carbon is returned to the atmosphere in the form of carbon dioxide include the following:

The processes by which carbon is removed from the atmosphere include the following:

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Complete question:

Which of the following is not a way for carbon dioxide to reach the atmosphere?

a. forest fires

b. respiration

c. photosynthesis

d. burning of fossil fuels

The data is provided as follows.

The evaporating dish's mass is 3.375 g.

total mass = mass of the solid sample plus the evaporating dish

Specifically, 26.719 g (Mass of solid sample + evaporating dish)

So, using the following formula, we can determine the mass of the solid sample.

mass of evaporating dish = (mass of evaporating dish - mass of solid sample)

= 26.719 g – 3.375 g

= 23.344 g

This leads us to the conclusion that his solid sample's mass must be 23.344 g.

A piece of glassware used in laboratories called an evaporating dish is used to evaporate solutions and supernatant liquids, sometimes to the point of melting.

The main significant distinction between an evaporating dish and a watch glass is that a watch glass typically lacks sides and rims and resembles a contact lens more in terms of shape. The reason behind the name of these objects is that they mimic the glass case of a wristwatch.

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Calcium oxide has different physical and chemical properties as compared to calcium carbonate. Option 1.

Calcium carbonate and calcium oxide are unique from one another in terms of their physical and chemical properties, even though calcium oxide can be produced by the decomposition of calcium carbonate.

Both calcium carbonate and calcium oxide are only similar in terms of their color. They both appear white in color. Their differences include:

Thus, both calcium carbonate and calcium oxide exhibit different chemical and physical properties.

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The complete question is as below:

Calcium carbonate is heated and decomposes to form calcium oxide (CaO) and carbon dioxide (CO2). Which statement is true about the difference between calcium carbonate and calcium oxide?

b. elemental composition d. shape and e. quantum mechanical effects  three factors significantly influence the properties of nanoscale materials.

Nanoscale material are the set of substances that have least one Critical dimension less than 100 nanometer. That have magnetic, electrical and optical properties. S and P blocks are there in the nanoscale materials. Nanoscale materials are mostly concentrated in the s and p blocks Nano elements. Nanoscale material have have structure with dimensions at the nanoscale.so it has size of 1-100nm.The shape of the nanomaterials are in various shapes like rod shape spherical shape ,fibers and cups. In the nanoscales quantum effects dominates the electrical optical properties of the system. They create new opportunity for manipulating the response of the system.

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Reaction conditions that favor elimination in an acid-catalyzed dehydration : product is removed from the reaction mixture when formed. For reaction to be completed,  hypochlorous acid must be in excess during the reaction.

Acid-catalyzed dehydration of alcohols takes place when an acid puts an extra hydrogen atom on the alcohol. This causes  change in the OH alcohol group into an H2O or water group attached to the organic compound. When that particular molecule leaves then it leaves as water . Therefore dehydration occurs.

The activity of a solid acid on methanol dehydration reaction was found to be determined by the number of its acidic sites. The presence of such acid catalyst in the catalytic system  shifts the methanol synthesis reaction, increasing the pass conversion of CO.

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The major organic product formed in the reaction of 1−methylcyclohexene with bromine in water is attached as a picture.

A reaction mechanism is a representation of step by step transfer of electrons and molecules from one compound to another compound. In reaction mechanisms, the curved arrows show the moment of electrons.

In the reaction mechanism of 1-methyl cyclohexene the double bond of 1-methyl cyclohexene act as an attacking group and attacks Br2. As a result, one Br atom gets attached to 1-methyl cyclohexene. This results in a carbocation generation on the carbon having the methyl group. This carbon cation then attacks the oxygen of water molecules and the organic product (1S,2S)-2-bromo-1-methylcyclohexan-1-ol will generates as the major product.

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The density of the wood will be 0.5g/cm³ . It will float in water because its density is than that of water i.e, 1g/cm³ .

Given that the mass of the substance is 50 g and its volume is 100cm³

So, its density will be given as,

Density= Mass/ Volume

=50/ 100 g/cm³

= 0.5 g/cm³

When placed in water, an object with a density greater than or less than that of  water will float or sink, respectively. A substance's density is a defining characteristic that is independent of  substance's volume.

The substance's density is less than that of water. Due to lower density than water, the substance will float on the surface of water.

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All of the energy stored or applied on a body cannot be converted tono work done only the available form of energy is converted to work. The remaining part is called unavailable energy which is stored on the body or taken as increase in entropy.

According to thermodynamic concepts, the not all the energy can be converted into useful work .Or in other words only available energy can be converted to work. This available form of energy is called Gibbs energy.

For instance if we take a heat engine, the heat from the hot body is not completely transferred into colder body. According  to third law of thermodynamics, this unavailable work is being considered as gone for increase in entropy.

Therefore, only available energy of the electric drill can be changed to work done and that is 222 J out of 1000 J, remaining goes for an increase in entropy of the system.

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C₆H₁₂O₆ (glucose) has 72 valence electrons

Valence electrons are the electrons present in the outermost shell of any atom. So first we will find out the total number of atoms in glucose.

Total number of atoms in C₆H₁₂O₆ are:

    Number of carbon = 6

    Number of hydrogen = 12

    Number of oxygen = 6

Now we will find out the total number of valence electrons in each type of atom:

    Valence electrons in carbon = 4

    Valence electrons in hydrogen = 1

    Valence electrons in oxygen = 6

Calculate the total number of valence electrons in C₆H₁₂O₆ by multiplying the number of atoms with the number of valence electrons for each element. And then sum up all the valence electrons.

    valence electrons in C₆H₁₂O₆ = (6*4) + (12*1) + (6 * 6)

    valence electrons in C₆H₁₂O₆ = 24 + 12 + 36

    valence electrons in C₆H₁₂O₆ = 72

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The full ionic equation for the conversion of aqueous lead (II) nitrate to solid lead (II) sulfate and aqueous potassium nitrate is as follows:

PbSO4(s) + 2 K+ + 2 NO3 = Pb2+(aq) + 2 NO3(aq), 2 K+(aq), and SO42(aq) (aq)

Let's look at the molecular formula that results in solid lead (II) sulfate and aqueous potassium nitrate when aqueous lead (II) nitrate and aqueous potassium sulfate interact. This reaction involves two displacements.

 PbSO4(s) + 2 KNO3 = Pb(NO3)2(aq) + K2SO4(aq) (aq)

All ions and molecular species are included in the full ionic equation.

PbSO4(s) + 2 K+ + 2 NO3 = Pb2+(aq) + 2 NO3(aq), 2 K+(aq), and         SO42(aq) (aq)

The full ionic equation for the conversion of aqueous lead (II) nitrate to solid lead (II) sulfate and aqueous potassium nitrate is as follows:

PbSO4(s) + 2 K+ + 2 NO3 = Pb2+(aq) + 2 NO3(aq), 2 K+(aq), and SO42(aq) (aq)

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18.1 g is mass of mgf2 is contained in 80. 85 g of a 22. 4% by mass solution of mgf2 in water.

solution mass = 80.85 g

mass of solution percentage = 22.4%

% concentration =  Mass of solute/Mass of solution × 100/1

22.4 = x/80.85 × 100/1

x = 22.4 × 80.85/100

x = 18.1 g

The quantity of substance that makes up an element's atom is known as its atomic mass. One-twelfth of the mass of the carbon-12 atom, with an assigned atomic mass of 12 units, is expressed as a multiple of 1.992646547 1023 gram, or in other words, 1.992646547 gram. One atomic mass unit is equivalent to 1.660539040 1024 grams on this scale (amu). The atomic mass unit is sometimes referred to as the dalton in honor of English scientist John Dalton (Da).

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The Charlotte throws 5 darts and they all end up in the outer ring of the dart board is they are neither precise nor accurate.

Precise is defined as how close the measurement are with one another.  Accuracy is defined as how the measurement is close to the correct value.  if all the dart is close to each other but not on bullseye than it is high precise and low accurate. if the the dart are in the bullseyes and close to each other it is said to be high precise and high accurate.

Thus, The Charlotte throws 5 darts and they all end up in the outer ring of the dart board is they are neither precise nor accurate.

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Based on the number of atoms in 1 mole of a substance, the number of atoms in 1 mole of  K₂ZnO₂ is 3.01 * 10²⁴ atoms.

Atoms are the smallest particle of an element that can exist and still retain the properties of that element.

Atoms of elements take part in chemical reactions.

The number of atoms in a mole of a substance is equal to 6.03 * 10²³.

In 1 mole of the compound K₂ZnO₂:

there are 2 moles of K atoms = 6.03 * 10²³ * 2 atoms

there are 1 mole of Zn atoms =6.03 * 10²³ atoms

There are 2 moles of O atoms = 6.03 * 10²³ * 2 atoms

Total number of atoms in 1 mole of  K₂ZnO₂ = 3.01 * 10²⁴ atoms.

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The sequence of the decreasing the order of stability of the given compounds is :

BaCl₂  >  CaCl₂  > MgCl₂ > AlCl₃  > HCl > AgCl

The reactivity series of metals or the activity series can be described as the arrangement of metals in the descending order of their reactivities.

The metals at the top of the activity series are powerful reducing agents and can be easily oxidized. These metals easily tarnish/corrode. The reducing ability grows weaker while moving down the series.

The electropositivity of the elements reduces as we move down the reactivity series of metals. All metals above hydrogen in the activity series liberate hydrogen gas upon reacting with dilute HCl.

As given the elements of the reactive metals form more stable compounds therefore, the metals like Ba, Ca, and Mg form more stable compounds than H or Ag.

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Answer:

pic attached

Explanation:

A method for making pure crystal of magnesium chloride from magnesium and dilute hydrochloric acid can be done using filter paper.

For this method, use a filter paper and funnel.

As, magnesium chloride is in aqueous form, it will come out with the filtrate(solution).

take hydrochloric acid in beaker:

• Keep adding small pieces of magnesium ribbon, until magnesium is in excess

• filter using filter paper and funnel and filter excess magnesium

• pour the solution into evaporating basin

• and then heat using Bunsen burner

• leave it to crystallize

evaporate or  boil off the water

• then decant solution

• finally pat dry using filter paper.

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The moles of the base should be equal to the moles of phenol.

What is Williamson ether synthesis ?

An alkoxide ion acts as a nucleophile in the Williamson ether synthesis, an SN2 reaction in which an alkyl halide loses a halide ion to produce an ether. The reaction involves configuration inversion at chiral centers and may be constrained by potential competing elimination reactions.

What is nucleophile?

An atom or molecule that seeks the positive center of a chemical reaction, such as the atom's nucleus, is referred to as a nucleophile in chemistry because it has an electron pair that is available for bonding.

Therefore, the moles of base should be equal the mole of phenol.

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0.93 moles are present in 5.6 x 1023 particles of H2SO4

number of moles= given particle/ Avogadro number

number of moles= 5.6 x 1023 particles/6.022×10^23

number of moles=0.93 mol

The mole idea is a useful way to indicate how much of a substance there is. Even one gram of a pure element is known to have an enormous number of atoms when working with particles at the atomic (or molecular) level. The mole idea is frequently applied in this situation. The unit of measurement that receives the most attention is the "mole," which is a count of a sizable number of particles.

Popularly known as the Avogadro constant, the quantity 6.02214076×10^23 is frequently represented by the letter "NA". Atoms, molecules, monoatomic and polyatomic ions, as well as other particles, are examples of the elementary entities that can be represented in moles (such as electrons).

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Answer:

a producer is an organisms that produce food for themselves and other organisms.