Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.
Na(s) + O₂(g) → Na₂O₂ (s)

Answer: valeraldehyde

Explanation:

I had to memorize this one

The functional group present is aldehyde and name of compound is valeraldehyde.

Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.

The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.

Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.

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Both calcium oxide and carbon dioxide are inorganic compounds where calcium oxide is an ionic compound with a positive end at calcium and negative end at oxygen and carbon dioxide is a covalent compound formed by two double bonds between carbon and each oxygen.

Calcium oxide is also called soda lime which is an inorganic compound formed by the ionic bonding of oxygen and calcium. Calcium is a metal and it is electron rich with 2 valence electrons.

Oxygen is electronegative gas, having 6 valence electrons and require two electrons to be stable. Thus calcium donates its two electrons to oxygen making calcium a positive ions and oxygen a negative ion.

In carbon dioxide, carbon have a valency of four thus, it forms 4 bonds with two oxygens. Double bonds are formed with each oxygen as shown in the image. These bonds are formed by electron sharing and is called covalent.

Calcium carbonate is formed by passing carbon dioxide through lime (CaO) in which Ca exists as Ca²⁺ ion and carbonate as an anion with three negative charges residing on 2  oxygens in CO₃.

Therefore, the structure of each of these compounds depends on the type of bonds between the atoms and it is depicted in the uploaded image.

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Firstly we will determine the average or the mean of the objects density:

Now we will calculate the deviation. The deviation is how much is trial is different from the average. We take the absolute value so the answers can be positive:

We will determine the average of the deviation:

To determine the percent deviation we:

Answer: The percent deviation from the mean is 3.24%,

The set of quantum numbers (3, 3, -3, -1/2), and  (2, 1, 2, +1/2) are not possible. Therefore, options c and e are correct.

The set of numbers that can describe the position and energy of the electron. We have four quantum numbers principal, azimuthal, magnetic, and spin quantum numbers.

Principal quantum numbers (n) tell about the principal electron shell of the atom and the most probable distance between the electrons and the nucleus. The azimuthal quantum number (l) tells about the shape of an orbital in which an electron is present. It has values equal to l = n - 1.

The magnetic quantum number tells about the total number of orbitals in a subshell and the orientation of these orbitals.  The value of m lies in between -l to +l. The value of the spin quantum number describes the direction of spin of an electron and it has only two values +½ and -½.

In option c, the principle (n) and azimuthal (l) quantum number has the same value but when n = 3 the possible values of l are 2, 1, 0. In option d, the magnetic quantum number has the value of 2 while l has 1 which is not possible because when l= 1 the values of m can be  +1, 0, and -1.

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The concentration of methylamine chloride in the solution is 0.44 M.

given that :

concentration of methylamine , [ base ] = 0.15 M

pH = 10.20

pH + pOH = 14

pOH = 14 - pH = 14 - 10.20 = 3.8

Kb = 4.6 × 10⁻⁴

concentration of methylamine chloride , [ acid ] = ?

The equation of POH is given by the following formula :

POH = pKb + log [ acid ] / [ base ]

pkb = -log kb

pkb = - log ( 4.6 × 10⁻⁴ )

pkb = 3.33

now, substituting the values, we get:

POH = pKb + log [ acid ] / [ base ]

3.8 = 3.33 + log [ acid ] / [ 0.15 ]

0.47 = log  [ acid ] / [ 0.15 ]

10^0.47 =  [ acid ] / [ 0.15 ]

2.95 = [ acid ] / [ 0.15 ]

[ acid ] = 0.44 M

Thus, A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of 10.20,what is the concentration of methylamine chloride in the solution is 0.44 M.

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Answer:

Mixtures can be classified on the basis of particle size into three different types: solutions, suspensions and colloids. The components of a mixture retain their own physical properties.

Sorry for the bad English, love from Vanuatu!

Explanation:

Structural formulas are ways atoms and elements are arranged in a molecule. The structural formula of pentane, pentene, and pentyne are as shown below;

Pentane - C5H12

Pentene - C5H10

Pentyne - C5H8

e) Pentane is an alkane compound with a general formula CnH2n+2. The chemical formula of pentane is C5H12. There are only single bonds between the C-H atoms in the molecule.

Pentene is an alkene compound with a general formula of CnH2n. The chemical formula of pentene is C5H10. There is a double bond present between the C=H atoms. This double bond shows that the compound is an alkene.

Pentyne is an alkyne compound with a general formula of CnH2n-2. The chemical formula of pentene is C5H8. There is a triple bond present between the Carbon Hydrogen atoms. This presence of a triple bond shows that the molecule is an alkyne compound.

The energy from the sun heats up the water in the tank by convection and radiation.

We know that heat is that which is able to effect a temperature change in an object. Now, we know that there are three forms of heat transfer and these are;

1) Conduction

2) Convection

3) Radiation

Now, we know that radiation is the movement of heat without a medium of propagation. Heat from the sun reaches the tank by radiation. The molecules that are at the surface are first heated up and sink down while the heavier particles below move up. This is called convection.

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Answer

V2 = 1466.7 mL

Explanation

Given:

Volume 1 = 200 mL

Pressure 1 = 330.0 kPa

Pressure 2 = 45.0 kPa

Required: Volume 2

Solution:

To solve this problem we will use Boyles law

P1V1 = P2V2

V2 = P1V1/P2

V2 = (330.0 kPa x 200 mL)/45.0 kPa

V2 = 1466.7 mL

The amount of water needed to be added to a 8.6317 M NaCl solution to obtain a 1.0421 M solution starting with 4.7869 liters of solution would be 34.8629 L.

The problem here has to do with dilution. The dilution principle states that the number of moles of solute in a solution is constant before and after dilution.

In other words, the dilution principle can be mathematically expressed as:

[tex]m_1v_1[/tex] = [tex]m_2v_2[/tex].

Where [tex]m_1[/tex] and [tex]m_2[/tex] are molarities before and after dilution; [tex]v_1[/tex] and [tex]v_2[/tex] are volumes before and after dilution.

In this case:  [tex]m_1[/tex] = 8.6317 M,  [tex]m_2[/tex]= 1.0421 M,  [tex]v_1[/tex]= 4.7869 L. We are to determine v2.

[tex]v_2[/tex] = [tex]m_1v_1[/tex]/ [tex]m_2[/tex]

    = 8.6317x4.7869/1.0421

    = 39.6498 L

If the final volume of the solution is 39.6498 L and the starting volume is 4.7869, then the amount of water needed can be calculated as:

39.6498 - 4.7869 = 34.8629 L

Thus, the amount of water that will be added to the original solution in order to arrive at the diluted solution is 34.8629 L.

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Answer:

reactants /products, products / reactants, opposite / inverse

I can't exactly tell how many underscores there are.

Explanation:

This is biology, but it does contain chemistry.

First, we have to complete the reactions with the respective products:

Answer:

Explanation:

Here, we want to get the molar mass of the gas

Let us call it M

From the ideal gas equation, we can get the number of moles of the gas

Mathematically:

Also, n is the mass divided by the molar mass of the gas:

Where:

M is the molar mass that we want to calculate

m is the mass of the gas sample which is 1.45 g

P is the gas pressure which is 733 torr (to convert to atm, we multiply by 0.00131579 : 733 * 0.00131579 = 0.96 atm)

V is the volume which is 931 mL (We convert to L by dividing by 1000:

931/1000 = 0.931 L)

R is the molar gas constant which is 0.0821 L.atm/mol.K

T is the temperature that we convert to K by adding 273 K : 273 + 16 = 289 K)

Substituting the values, we have it that:

The stronger the acid the easier the H+ ions dissociate in solution of the following statements is true.

The correct option is A.

Because it almost entirely dissociates, HCl is a powerful acid. A weak acid, such as acetic acid (CH₃COOH), on the other hand, does not dissociate easily in water because numerous H+ ions are still locked up inside the molecule. In conclusion, more free H+ ions are liberated into solution with stronger acids.

Strong acids (and bases) are completely dissociated into ions, which is the cause of this. In comparison to weak acids (and bases) of comparable concentrations, they therefore supply more ions for conductivity. An illustration is the complete ionization of a 0.1 M hydrochloric acid solution.

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The complete question is -

Which of the following statements is true?

A-The stronger the acid the easier the H+ ions dissociate in solution.

B-The weaker the acid the easier the H+ ions dissociate in solution.

C-The stronger the base the easier the H+ ions dissociate in solution.

D-The weaker the base the easier the H+ ions dissociate in solution.

Answer

The percent yield = 83.36%

Explanation

Given:

Experimental yield = actual yield = 15.68 g

Theoretical yield = 18.81 g

What to find:

The percent yield for the reaction.

Step-by-step solution:

The percent yield for the reaction can be calculated using the formula below:

Hence, the percent yield for the reaction is 83.36%

Since Jade tried to throw the horseshoe with the same amount of force, the likely distances that Jade measured would be 11 in., 12 in., 13 in. The last option.

The distance that the horseshoe thrown by Jade travels is a measure of the amount of force that she applies. The more the force, the longer the distance.

However, Jade tried to ensure that the same amount of force is used the 3 times she threw the horseshoe. The consequence is that the distance of the horseshoe from the stake will not vary much in all the 3 throws.

If the distances vary significantly, it means the amount of force used by Jade also differs significantly.

Thus, the only distances that could be a reflection of the relatively constant force used by Jade to throw the horseshoe are 11 in., 12 in., 13 in.

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The stability of alkene can be determined by measuring the amount of energy that is associated with the hydrogenation of the molecule.

Because those branched alkanes are more stable than their linear isomers (Figure 1), the origins of this stability are unclear. For each branch in an alkane, the measured heat of formation is lower than expected by about 2 kcal mol−1 in comparison to the linear isomer. The fullness structures in which all atoms have complete valence shells are more stable. The structures with the least number of ritual charges are more stable. The structures with a negative charge on the further electronegative atom will be more stable. The three main factors determining the relative stability of alkenes are i) the number of substituents attached to the double-bond carbon atoms, ii) hyperconjugation, and iii) the stereochemistry of the double bond.

So we can conclude that the more electron-donating alkyl groups are the more stable the alkene

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Answer:

The correct answer is option C. Slavery is a degrading institution to all those involved. Explanation: As Douglass narrates, slavery not only degrades slaves, but slavers asWhich of the following sentences best describes Douglass’s opinion about slavery?

The maximum length of gold foil could be 1171.7 cm made from 1.10 x 10³ g of gold.

The density of an object can be described as the mass per unit volume. The average density is equal to the total mass divided by its total volume.

The mathematical formula of the density of the material can be expressed as follows:

Density = Mass/Volume

The density of a substance is an intrinsic property as it doesn't depend on its size and the S.I. unit of the density is Kg/m³.

Given the width of the gold foil, w = 304 mm = 30.4 cm

The height or thickness of the foil, h = 0.016 mm = 0.0016 cm

The density of the gold foil, d = 19.3 g/cm³

The mass of the gold given, m = 1100 g

The volume of the foil = m/d = 1100/ 19.3 = 56.99 g/cm³

As we know that the volume of  gold foil , V = l × w × h

l = V/(w × h)

l = 56.99/(30.4 × 0.0016)

l =1171.7 cm

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The fact that some of the solid was transferred would decrease the mass of the limiting reactant.

We know that in a chemical reaction, there are at least two substances that are combined in order to give the product of the reaction. We also know that the product that we obtain must be in accordance to the stoichiometry of the reaction.

It is common to see that one of the reactants would be present in a very large amount while the other reactant would be present only in quite a small amount. The reactant that is present in a small amount is said to be the limiting reactant while the one that is present in the large amount is said to be the reactant that is in excess.

Having said this, we know that the mass of the limiting reactant can be obtained from the mass of the solid that is obtained after the reaction.

If we do not take out all of the solid from the centrifuge, the mass would not be accurately weighed and the mass of the limiting reactant would not be accurately determined.

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Answer:

Chemistry - States of matter - Kinetic Molecular Theory

This is the theory that explains the states of the matter and is based on the idea that matter is composed of tiny particles that are always on motion.

Part 1: Check all the statements that apply to the behavior of an ideal gas

The behaviors that apply are:

1.Gas paarticles behave like hard sphares.

2.Gas particles travel randomly.

5. Average kinetic energy of a collection of gas particles depends on the temperature.

Part 2: According to kinetic-molecular theory the one that would not be considered an ideal gas is:

A gas with highly polar molecules that have very strong intermolecular forces.

This is because the theory consideres thhat there are no forces of attraction of repultion between gas particles.

Answer:

first blank: protons

second black: electrons

Explanation:

Answer: the concentration of the solution after the dllution is 0.050 M

Explanation:

The question requires us to determine the concentration of a solution after a dilution process.

The following information was provided by the question:

Concentration of initial solution = C1 = 0.30 M

Volume taken from initial solution = V1 = 25.0 mL

Volume of final solution = V2 = 150 mL

When a solution is diluted, the number of moles of the substance remains the same. Thus, we can say that:

where (1) is the solution before dilution and (2) refers to the solution after dilution.

The number of moles of a substance can be obtained from the definition of molarity (or molar concentration), where the number of moles is divided by the volume of the solution:

Thus, we can write that for a dillution:

From the expression above we can determine the concentration of the final solution. Applying the values provided by the question to the expression above, we'll have:

Therefore, the concentration of the solution after the dilution is 0.050 M.

The temperature should be between 30 °F and 60 °F because the temperature outside is 39 °F, so the water in the pond should have a temperature range that includes this temperature.

Therefore, the answer is B.

Answer:

A is the correct answer.

Explanation:

It is possible to reach 1°C and 1°F because they are both units of temperature. But 1k is not a unit of temperature.

Answer

Concentration = (8/92)*100 = 8.7%

Explanation

Given:

mass of salicylic acid (active ingredient) = 8 g

mass of an ointment base = 84 g

Required: concentration (w/w) of the product?

Solution:

Total mass of the mixture = 8 + 84 = 92 g

Concentration = (8/92)*100 = 8.7%

In this question, we have to classify what is a redox reaction, and as the name suggests, we have a reduction and an oxidation reaction occurring in this type of reaction, where one element will lose electrons, or will be oxidized, and another element will gain electrons or will be reduced. Therefore the best answer will be letter C

Explanation:

The theoretical yield of our reaction is 1.50 moles, the actual yield of aluminum oxide is 0.885 moles. The percent yield is:

percent yield = actual yield/theoretical yield * 100 %

percent yield = 0.885 moles/(1.50 moles) * 100 %

percent yield = 59.0 %

Answer: The percent yield is 59.0 %.

Answer

The weight/weight % of solute = 5.3%

Explanation

Given

Mass of solute (potassium nitrate) = 4.87 g

Volume of solvent (water) = 86.4 mL

Density of water = 1.00 g/mL

Required: Weight/weight% of the solute

Solution

Step 1: Covert the volume of water to mass

mass = density x volume

mass = 1.00 g/mL x 86.4 mL

mass = 86.4 g

Step 2: Calculate the weight/weight % of the solute

Mass % solute = [mass of solute/(mass of solute + mass of solvent)] x 100

Mass % solute = 4.87g/(4.87 + 86.4)

Mass % solute = 5.3%

The chart of given following ion is

Protons Electrons Neutrons

1) 6 2 8

2) 6 2 7

3) 8 10 9

4) 8 10 8

Simply put, a subatomic particle is a particle that is smaller than an atom. Protons, electrons, and neutrons are the three subatomic particles that may typically be separated from an atom.

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