a student conducts an experiment and finds that a sample of the solid substance he is testing conducts electricity. the student concludes that the material must be an covalent compound. what is wrong with this conclusion?

Chemistry =>Introduction to Chemistry => Scientific Method

A scientific method corresponds to a methodology to obtain new knowledge.

We must start from an idea, an assumption of how a compound or a process behaves, this is our hypothesis.

Following this, we must identify what can affect our process, what are the variables, and what will be the response variable, for this we carry out an experiment.

Once the experiments have been carried out, we must analyze the results, draw conclusions as to why the behavior occurs, and if our hypothesis is true or not.

It is useless for us to obtain new knowledge if we do not share it, We have to share the results, in this way other people can start from that knowledge to create another,

Therefore, the answer will be:

1. Make a hypothesis

2. Conduct an experiment

3. Analyze the experiment data

4. Communicate the results

a. The metal known as cobalt forms cobalt III oxide and cobalt II oxide when it react with oxygen.

b. The ionic charge on the metallic copper is +2

When cobalt II oxide reacts with oxygen, it results in the formation of cobalt III oxide.

The balanced chemical equation is given below.

4CoO + O₂ → 2Co2O₃

The ion on metallic is plus 2 charge, it is on this premise that the ionic charge on the metallic copper is confirmed as +2.

So therefore, when cobalt is combines with air, it forms a binary compound known as cobalt II oxide and tricobalt tetroxide.

O₂

Complete question:

a. What compounds does cobalt metal forms?

b. What is the charge on copper ion?

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The mole fraction of water decreases because, at this starting mole fraction, solid water forms before solid acetic acid.

What is mole fraction ?

Mole fraction represents the number of molecules of a particular component in a mixture divided by the total number of moles in the given mixture. It’s a way of expressing the concentration of a solution.

The amount fraction is another name for the mole fraction.  It is the same as number fraction, which is calculated by dividing the number of molecules in a constituent (Ni) by the sum of all molecules. Instead of using a Roman x, the lowercase Greek letter chi is occasionally used to represent the mole fraction. The IUPAC recommends the letter y for gas mixtures.

Because it does not include the name of the unit mole, the National Institute of Standards and Technology of the United States prefers the phrase amount-of-substance fraction to mole fraction.

Molar concentration is a proportion of moles to volume, whereas mole fraction is a ratio of moles to moles.

The mole fraction of water decreases because, at this starting mole fraction, solid water forms before solid acetic acid.

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Answer:

a buffalo

Explanation: if its north America it needs to be native from here none of the other are from north America

When a chemical reaction happens, the atoms in the reactants are rearranged to create compounds with various chemical characteristics. Although identical atoms are present in both the reactants and the products, sodium chloride was produced by rearranging the atoms in the reactants. The reactants lacked sodium chloride.

Sodium is a soft, silver-colored metal that may be sliced with a knife. With water, pure sodium metal reacts violently (and even explosively), creating sodium hydroxide, hydrogen gas, and heat.

2Na(s)  +  2H₂O(l)  ⟶  2NaOH(aq)  +  H₂(g)

Chlorine is a poisonous yellow-green gas with a pungent smell.

But when sodium and chlorine combine, they create sodium chloride, or table salt, which is known to practically everyone in the world.

2Na(s)  +  Cl₂(g)  ⟶  2NaCl(s)

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Using the balanced reaction equation, we can calculate that the mass of the precipitate will be 1.617 g.

To solve this question, we need to write the balanced reaction equation first:

2 NaF(aq) + BeSO₄(aq) → Na₂SO₄(aq) + BeF₂(s)

We can now see that the precipitate will be beryllium fluoride. We can also see that 1 mol of beryllium sulfate reacts with 2 moles of sodium fluoride. Now we can calculate the number of moles (n) of both reactants using their molarities (c) and volumes (V):

c = n/V ⇒ n = c * V

n(NaF) = c(NaF) * V(NaF)

n(NaF) = 4.988 M * 79.854 mL = 0.3983 mol

n(BeSO₄) = c(BeSO₄) * V(BeSO₄)

n(BeSO₄) = 1.471 M * 23.3760 mL

n(BeSO₄) = 0.03439 mol

We can see that n(NaF) is more than 2 times greater than n(BeSO₄), so NaF is in excess, and BeSO₄ is the limiting reactant. Now we can calculate the number of moles of BeF₂ formed:

1 mol BeSO₄ : 1 mol BeF₂ = 0.03439 mol BeSO₄ : X

X = 0.03439 mol BeF₂

We can now convert the number of moles (n = 0.03439 mol) of BeF₂ into mass (m), using the molar mass of BeF₂ (M = 47.01 g/mol):

n = m/M ⇒ m = n * M

m = 0.03439 mol * 47.01 g/mol

m = 1.617 g

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The remaining mass of radioactive elements with 60 years of half-life is 1000 particles.

We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation

N = No(1/2)^(t/t'')

where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.

From the question above, we know that

t'' = 60 years

No = 2000 particles

t = 60 years

Calculate the remaining mass

N = No(1/2)^(t/t'')

N = 2000 x (1 / 2)^(60 / 60)

N = 1000 particles

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The force required to move a body with a mass of 5kg and accelerating at 10m/s² is 50 Newtons.

A force is simply a push or pull of a body resulting from the object's interaction with another object.

From Newton's Second Law, force is expressed as;

F = m × a

Where is mass of object and a is the acceleration

Given the data in the question;

Plug the given values into the equation above and solve for F.

F = m × a

F = 5kg × 10m/s²

F = 50kgm/s²

F = 50N

Therefore, the force of Christian is 50 Newtons.

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The force required to move the body with the mass of 5 kg with acceleration of 10 m/s² is 50 Newtons.

Force is defined as a push or pull exerted on an object as a result of the interaction of the object with another object.

It can also be defined as an external factor that, when used, alters or has the potential to alter the state of the body.

Force can be expressed as

Force = mass x acceleration

Given, Mass = 5 kg

Acceleration = 10 m/s²

So, F = m x a

F = 5 kg x 10 m/s²

F = 50 kgm/s²

F = 50 Newtons

Thus, the force required to move the body with the mass of 5 kg with acceleration of 10 m/s² is 50 Newtons.

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The hydrologic cycle to be altered because of global warming due to increasing green house effect.

Global warming is the term used to describe the phenomena of a gradual increase in temperature close to the earth's surface. This trend has been noticed during the past century or so. This change has affected the pattern of the earth's climate. Scientists have offered proof that the earth's temperature is gradually rising, even if the concept of global warming is still up for debate.

Global warming has a number of causes that are harmful to people, plants, and animals.

A glass-enclosed structure called a greenhouse is used to grow plants. The sun's beams warm the greenhouse's air and plants. The greenhouse must be warmed in order for the plants to flourish because the heat that is trapped inside is unable to escape. The earth's atmosphere is identical.

The greenhouse gases in the earth's atmosphere absorb the heat throughout this process. Because of this, the earth's surface becomes warmer, which enables life to exist on the planet.

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Mg2N3  compound having general formula X2Y2  it having cation as +3 charge and bonds ionically with group 15 in a 2:3 ratio.

When two or more elements combine chemically  in a specific mass ratio, the resulting product is called a compound. Compounds can be defined as substances consisting of two or more different types of elements in a fixed ratio of their atoms.

A compound is one where  different types of atoms have joined together to form molecules. For example, water is a compound. The chemical name of water is H2O because it contains two hydrogen atoms and one oxygen atom chemically bonded together.

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4Al + 2Pb(No3)2 → 4Al(No3) + Pb2

Hope this helps!

XY + Z→ XZ + Y is an example of a substitution reaction. A substitution reaction involves the exchange of one atom for another.

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The process of anabolism is a metabolic pathway in which one or more molecules are used to synthesize more complex compounds.

Anabolism refers to the chemical metabolic reactions that occur in biological systems which are aimed at generating complex molecules from simpler ones. This process is different from catabolism, which involves the release of energy to be used in the anabolic process.

Therefore, with this data, we can see that anabolism refers to the generation of complex molecules in biological systems by using the energy generated by catabolic reactions in the body.

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According to the concept of molar mass, mass of water of hydration lost is 90 g/mole and mass of dehydrated salt is 159.68 g/mole as the mass of copper sulfate pentahydrate is 249.68 g/mole.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

Copper sulfate along with water of hydration has mass of 249.68 g/mole.On heating , the mass of water of hydration lost =90 g/mole

∴mass of dehydrated salt=249.68-90=159.68 g/mole.

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If we assume that helium acts as an ideal gas, we can calculate that 1.000 mol of it will take up 3.43 L, which is 6.53 times less than its volume at standard conditions.

Assuming that helium behaves like an ideal gas in both cases, we can calculate the volume at 2.20 K using the ideal gas equation:

PV = nRT

P - the pressure exerted by the gas (0.05256 atm)

V - the volume of the gas

n - number of moles of the gas (1.000 mol)

R - universal gas constant (0.08206 L*atm/K*mol)

T - temperature (2.20 K)

If we rearrange the equation, we get:

V = nRT/P

Now we plug in the known values:

V = 1.000 mol * 0.08206 L*atm/K*mol * 2.20 K / 0.05256 atm

V = 3.43 L

At standard conditions (273 K, 1 atm), 1 mol of an ideal gas has a volume of 22.4 L, so the volume at described conditions is 22.4 L / 3.43 L = 6.53 times smaller than at standard conditions.

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Answer:

Explanation:

In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?

O C. Exhaust

Density of water is 1g/cc whereas ethanol is 0.79g/cc

So density of ethanol is less than water hence ethanol will float on water

What is density ?

density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density. For instance, while Earth has a density of 5.51 grammes per cubic centimeter, water has a density of 1 grammes per cubic centimeter. Another way to state density is in kilograms per cubic meter (in meter-kilogram-second or SI units)

Density of water is 1g/cc whereas ethanol is 0.79g/cc

So density of ethanol is less than water hence ethanol will float on water

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To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:

The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.

Is sucrose a good sugar to use?

Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.

Is sugar a healthy food?

Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.

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Answer:

the metal salts are more stable and less reactive than the pure metals

Explanation:

hope this helps

Electrons from fadh2 are transferred to succinate reductase and then to a small organic molecule called Ubiquinone.

Electron Transport chain?

The electron transport chain main job is to produce an electrochemical gradient. It propels the production of ATP during photosynthesis and cellular respiration in mitochondria and chloroplasts, respectively. Cellular respiration uses it.

Ubiquinone transfer electrons to Complex III from Complexes I and II as well as from other mitochondrial dehydrogenases by acting as an electron transporter in the mitochondrial respiratory chain.

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Bread grows mold more quickly at room temperature than in the refrigerator because more reactants will have the energy necessary to proceed to products at room temperature than at refrigerator temperatures.

Molds are formed on bread due to various reactions that facilitate the living of the molds on the bread and allow them to reproduce on the bread.

However, as molds are living organisms characterized as fungi, they need enzymes for function.

The enzymes and proteins normally function best at room temperature. On the other hand, when the temperatures are low, such as that of a refrigerator the molds will not have enough energy because the proteins and enzymes will be inactivated. Hence, molds grow on bread quickly at room temperature as compared to bread in a refrigerator.

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The atomic mass of element x is 85.56 amu if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu

The atomic mass of an element can be determined by first multiplying the percentage of its isotopes by their atomic mass and then adding the resultants together.

As 72% of the atoms have a mass of 85 amu and 28% have a mass of 87 amu, therefore

atomic mass of element x = (72% × 85) + (28% × 87)

atomic mass of element x = (72/100 × 85) + (28/100 × 87)

atomic mass of element x = (0.72 × 85) + (0.28 × 87)

atomic mass of element x = 61.2 + 24.36

atomic mass of element x = 85.56 amu

Therefore the atomic mass of element x is calculated to be 85.56 amu.

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The correct answer about Liquids A and B is:

Liquid B has a lower boiling point because more water evaporated, therefore the interactions between the particles in Liquid B are weaker than the interactions in Liquid A; option D

The boiling point of a liquid is the temperature at which the molecules of the liquid change phase from liquid to gas.

At the boiling point of a liquid, the molecules of the liquid acquire enough energy to break free of the intermolecular forces between the molecules.

The lower the boiling point of a liquid, the lesser the strength of the intermolecular forces between the molecules,

Hence liquids with lower boiling points evaporate faster.

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The oxides of 'C' and 'N' are the two molecular compounds having the same mass i.e. CO₂ and N₂O.

To calculate the molecular weight of a molecule, individual atomic masses of various elements are added.

Given: The atomic mass of 'C' = 12u

          The atomic mass of 'N' = 14u

          The atomic mass of 'O' = 16u

∵Molecular weight of CO₂ = 12+16+16 = 44g/mol

The molecular weight of Carbon Dioxide is 44g/mol.

∵Molecular weight of N₂O = 14+14+16 = 44g/mol

The molecular weight of Nitrous Oxide is 44g/mol.

Molecular compounds having the same mass are known as Isobars. Isobaric properties are:

e.g.: Ar and Ca

Consider a 3-atom molecule a-b-a for which b has a total of only two valence electrons if you assume that b is a group ii metal, then the bond angle for a-b-a is 180 degree

Valence electron is the s and p electron in the outermost shell and electron present in the inner shell are core electron and according to the valence shell electron pair repulsion theory and we that bond angle that an atom has with its neighbor which also called dihedral angle a group II metal has two valence electron there it can form only single bond then b will not have any lone pair and the ones digit in the group number is the number of valence electron and 180 degree bond angle means the atom are connected in straight line called 180 degree bond

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A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.

Volcano is defined as a rupture in the part of the crust of the planetary mass of the object generally Earth, which allows the hot lava as well as ash, including the gases that has been escaped from the chamber of the magma.

Therefore, A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.

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When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond nitrogen lone bond.

Strong intermolecular interactions known as hydrogen bonds can develop between adjacent molecules. Between the covalently bound hydrogen atom of one molecule and the electron lone pair of a second molecule, hydrogen bonds are created.

Due to their strong electronegativity, only nitrogen, oxygen, or fluorine atoms may be used in this process. These three atoms have extremely high electronegativity, which makes it simple for them to draw the electron from the hydrogen atom and establish hydrogen bonds.

Atoms within a molecule are held together by intramolecular forces. There are forces between molecules known as intermolecular forces.

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Answer:

I think 11 yeah.. try that

Explanation:

Answer:

Explanation:Again, this is an example of a physical change. Figure 3.6. 1: Ice melting is a physical change. When liquid water (H2O) freezes into a solid state (ice), it appears changed; however, this change is only physical, as the composition of the constituent molecules is the same: 11.19% hydrogen and 88.81% oxygen by mass.03-Sept-2019