TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

Which statement best explains why a carbon atom can bond easily with other atoms? It is an ion. It is an organic element. It has four valence electrons. It forms hydrogen bonds.


Based on the definition of a carbon atom, the statement that best explains why a carbon atom can bond easily with other atoms because it  has four valence electrons. So the answer would be the third option. Hope this answers your question.

Related Questions

Posted in Chemistry

Indicate whether the following are acidic, basic, or neutral solution A. [H2O+]=6.0x10^-12 B. [H3O+]=1.4x10^-9 C. [OH-]=5.0x10^-12 D. {OH-]=3.5x10^-10

You answer this by using the pH formula and and the relation of pH and pOH, pH = -log[H+] and 14 = pH + pOH. The correct classification are as follows:

A. [H2O+]=6.0x10^-12
basic

B. [H3O+]=1.4x10^-9
basic

C. [OH-]=5.0x10^-12
acidic

D. {OH-]=3.5x10^-10
acidic

Hope this answers the question.

Posted in Chemistry

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S(g) + 3F2(g) ->SF6(g) If 50 g S is allowed to react as completely as possible with 105.0g F2(g), what mass of the excess reactant is left.

The balanced chemical reaction is:

S(g) + 3F2(g) ->SF6(g)

We are given the amount of the reactants to be used in the reaction. We use these as the starting values for the calculations. We calculate as follows:

50 g S ( 1 mol / 32.066 g ) = 1.56 mol S
105 g F2 ( 1 mol / 38.00 g ) = 2.76 mol F2

The limiting reactant would be F2 since it will be consumed completely in the reaction. The excess reactant would be S. 

Mass of excess = 1.56 mol - 2.76(1/3) = 0.64 mol S excess

Posted in Chemistry

In the following reaction, how many grams of oxygen will react with 10.47 grams of benzene (C6H6)? 2C6H6 + 15O2 12CO2 + 6H2O The molar mass of benzene is 78.1074 grams and that of O2 is 32 grams.

The balanced chemical reaction is:

2C6H6 + 15O2 = 12CO2 + 6H2O

We are given the amount of benzene to be used in the reaction. We use this as the starting point for the calculations. We do as follows:

10.47 g C6H6 ( 1 mol / 78.1074 ) ( 15 mol O2 / 2 mol C6H6 ) ( 32 g / mol ) = 32.17 g O2

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

You carefully weigh out 14.00 g of CaCO3 powder and add it to 56.70 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 64.96 g . The relevant equation is CaCO3(s)+2HCl(aq)→H2O(l)+CO2(g)+CaCl2(aq) Assuming no other reactions take place, what mass of CO2 was produced in this reaction?

Answer : The mass of CO_2 produced will be, 6.16 grams.

Explanation : Given,

Mass of CaCO_3 = 14 g

Mass of HCl = 56.70 g

Molar mass of CaCO_3 = 100 g/mole

Molar mass of HCl = 36.5 g/mole

Molar mass of CO_2 = 44 g/mole

First we have to calculate the moles of CaCO_3 and HCl.

\text{Moles of }CaCO_3=\frac{\text{Mass of }CaCO_3}{\text{Molar mass of }CaCO_3}=\frac{14g}{100g/mole}=0.14moles

\text{Moles of }HCl=\frac{\text{Mass of }HCl}{\text{Molar mass of }HCl}=\frac{56.70g}{36.5g/mole}=1.55moles

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

CaCO_3(s)+2HCl(aq)\rightarrow CO_2(g)+H_2O(l)+CaCl_2(aq)

From the balanced reaction we conclude that

As, 1 moles of CaCO_3 react with 2 mole of HCl

So, 0.14 moles of CaCO_3 react with 0.14\times 2=0.28 moles of HCl

From this we conclude that, HCl is an excess reagent because the given moles are greater than the required moles and CaCO_3 is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of CO_2.

As, 1 moles of CaCO_3 react to give 1 moles of CO_2

So, 0.14 moles of CaCO_3 react to give 0.14 moles of CO_2

Now we have to calculate the mass of CO_2.

\text{Mass of }CO_2=\text{Moles of }CO_2\times \text{Molar mass of }CO_2

\text{Mass of }CO_2=(0.14mole)\times (44g/mole)=6.16g

Therefore, the mass of CO_2 produced will be, 6.16 grams.

Posted in Chemistry

Which of the following are most likely to form a metallic bond? several gold atoms copper and chlorine magnesium and chlorine several chlorine atoms

I think the correct answer from the choices listed above is the first option. It would be several gold atoms that will form a metallic bond. It is the most logical choice since it is a metal while the others are nonmetal and a combination of metal and nonmetal. Hope this answers the question. Have a nice day.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

Which compound contains only nonpolar covalent bonds? O2 CO2 H2O NO3

I believe the correct answer from the choices listed above is the first option. O2 is the compound that contains only nonpolar covalent bonds. It is nonpolar since it does not have unequal distribution of charges. Hope this answers the question. Have a nice day.

Posted in Chemistry

Which shows the correct relationship? A.) Eo cell > 0 = nonspontaneous reaction B.) Eo cell > 0 = spontaneous reaction C.) Eo cell = 0 = nonspontaneous reaction D.) Eo cell < 0 = spontaneous reaction

Answer: B.) E^0_{cell} > 0 = spontaneous reaction

Explanation:

The standard emf of a cell is related to Gibbs free energy by following relation:

\Delta G=-nFE^0

\Delta G = gibbs free energy

n= no of electrons gained or lost

F= faraday's constant

E^0 = standard emf

when \Delta G= +ve, reaction is non spontaneous

\Delta G= -ve, reaction is spontaneous

\Delta G= 0, reaction is in equilibrium

Thus reaction is spontaneous when E^0= +ve

Thus reaction is non spontaneous when E^0= -ve

Thus reaction is in equilibrium when E^0= 0.

Posted in Chemistry

Monel metal is a corrosion-resistant copper-nickel alloy used in the electronics industry. A particular alloy with a density of 8.80 g/cm3 and containing 0.073% Si by mass is used to make a rectangular plate that is 15.0 cm long, 12.5 cm wide, and 2.50mm thick and has a 2.50-cm-diameter hole drilled through its center such that the height of the hole is 2.50mm . The silicon in the plate is a mixture of naturally occurring isotopes. One of the those isotopes is silicon-30, which has an atomic mass of 29.97376 amu and a percent natural abundance of 3.10% How many silicon-30 atoms are found in this plate? Express your answer numerically using two significant figures.

Answer is: there are 1.82·10²⁰ silicon-30 atoms.

V₁(alloy) = 15 cm · 12.5 cm · 0.25 cm.

V₁(alloy) = 46.875 cm³; volume of the alloy without hole.

V(hole) = 0.25 cm · (1.25 cm)² · 3.14.

V(hole) = 1.23 cm³

V₂(alloy) = 46.875 cm³ - 1.23 cm³.

V₂(alloy) = 45.65 cm³; volume of the alloy with hole.

m(alloy) = V₂(alloy) · d(alloy).

m(alloy) = 45.65 cm³ · 8.80 g/cm³.

m(alloy) = 401.7 g; mass of the alloy.

ω(Si) = 0.073% ÷ 100%.

ω(Si) = 0.00073.

m(Si) = ω(Si) · m(alloy).

m(Si) = 0.00073 · 401.7 g.

m(Si) = 0.293 g; mass of silicon it the alloy.

m(Si-30) = m(Si) · ω(Si-30).

m(Si-30) = 0.293 g · 0.031.

m(Si-30) = 0.0091 g; mass of the silicon-30.

n(Si-30) = m(Si-30) ÷ M(Si-30).

n(Si-30) = 0.0091 g ÷ 29.97376 g/mol.

n(Si-30) = 0.000303 mol; amount of the silicon-30.

N(Si-30) = n(Si-30) · Na (Avogadro constant).

N(Si-30) = 0.000303 mol · 6.022·10²³ 1/mol.

N(Si-30) = 1.824·10²⁰.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

Draw a complete Lewis structure for the conjugate acid of nitromethane that shows all bonds, unshared electron pairs, and minimized formal charges, where appropriate.

Answer:

Lewis structures are shown below

Explanation:

  • In Lewis structure of nitromethane, a negative charge is present on oxygen atom in nitro group.
  • Hence this oxygen atom acts as a basic center preferably.
  • Therefore conjugate acid of nitromethane should be drawn by adding a hydrogen atom with this oxygen atom.
  • Lewis structure of nitromethane as well as it's conjugate acid has been shown below including all the lone pairs and formal charges

Posted in Chemistry

An unknown compound contains only carbon, hydrogen, and oxygen (CxHyOz). Combustion of 2.50g of this compound produced 3.67g of carbon dioxide and 1.50g of water. How many moles of carbon, C, were in the original sample?

The solution to the problem is as follows:

 a) 

C + O2 = CO2 

Molar mass CO2 = 44 g/mol 

3.67 g CO2 * 1 mol / 44 g = 

=0.0834 mol CO2 = 0.0834 mol C 

I hope my answer has come to your help. God bless and have a nice day ahead!

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

What kind of bond does these have? 1.tap water 2.distilled water 3.sugar 4.salt 5.salt in distilled water 6.sugar in distilled water

1. Tap water has a small concentration of H+ & OH- ions as well as water molecules, hence there would be permanent dipole-permanent dipole (p.d.-p.d.) forces of attraction between the water molecules (aka H-bonds) as well as ionic bonds between the H+ & OH- ions.

2. Distilled water does not have H+ & OH- ions, hence only H-bonds exist between the water molecules.

3. There are covalent bonds between the individual sugar molecules.
 
4. There are ionic bonds between the Na+ & Cl- ions in NaCl.
 
5. There are p.d.-p.d. forces of attraction between the Na+ ions and the O2- partial ions of the water molecules as well as between the Cl- ions and the H+ partial ions of the water molecules. There are also H-bonds between the individual water molecules and ionic bonds between the Na+ & Cl- ions (although these are in much lower abundance than in unsolvated solid NaCl).

6. There are i.d.-i.d. as well as p.d.-p.d. forces of attraction between the sugar molecules and the water molecules. There are also H-bonds between the individual water molecules and covalent bonds within the sugar molecules.

Posted in Chemistry

A teacher makes the following statement. “Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.” What topic is the teacher most likely talking about? a. distillation of a mixture b. filtration of a pure substance c.evaporation of a mixture d. sorting of a pure substance

Answer:

The correct answer is option a.

Explanation:

According the question, boiling points of different liquids are discussed which means that if we take all these liquids in single mixture we can separate them from each other on the basis of their difference in boiling point. And the technique which employs this principle is distillation process.

Hence, we can say teacher is most likely talking about distillation of a mixture of oils.

Distillation is a process which is used to separate mixture of different liquids from each other. In this process, during the course of boiling of mixture liquid compound with lower boiling points vaporizes first leaving behind the liquid with higher boiling point behind.

And vapors of boiled liquid are condensed down in a separate container for the collection.

Posted in Chemistry

Which of the following ions would represent the ion of an element from Group 2A? A. X2- B. Y3+ C. Z+ D. A2+

An element belongs to particular group is related to the number of electrons present in the outer shell of the atoms. In given case, group is 2, therefore, number of valence electrons is 2 implies it has ability to lose two electrons to get +2 charge.

A\rightarrow A^{+2}+2e^{-}

Therefore, ion formed after removal of two electrons is A^{2+}.

Hence, option (D) is the correct answer.






TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

Which contributes to the dissolution of sugar in water? a. the dissociation of an ionic compound in water b. a strong pull of water molecules on an ionic compound c. the dissociation of a polar covalent compound in water d. a strong pull of water molecules on a polar covalent compound

Option C: The dissociation of a polar covalent compound in water.

Sugar is made up of sucrose molecules containing polar covalent bonds. They have same type of oxygen-hydrogen covalent bonds that are present in water.

Since, sugar is not an ionic compound, option a and option b are incorrect. Also, due to same type of bonding in water and sugar molecules there will be no such force of attraction between them, this will opt out the option d.

Thus, dissolution of sugar in water is the dissociation of a polar covalent compound in water and option c is correct.

Posted in Chemistry

What is the mass of 5.05×1021 platinum atoms?

Answer: 1.6 gram

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given atoms}}{\text {Avogadro's Number}}

\text{Number of moles of water}=\frac{5.05\times 10^{21}}{6.023\times 10^{23}}=8.4\times 10^{-3}moles

1 mole of Platinum Pt weighs 195 g

8.4\times 10^{-3}moles  of Platinum Pt weigh =\frac{195}{1}\times 8.4\times 10^{-3}=1.6g

Thus mass of 5.05\times 10^{21} platinum atoms is 1.6 gram.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

Which statement best characterizes chemical reactions? They always occur very quickly. Their rates vary significantly. Their rates are always slow. They rarely occur in the natural environment.

I think the correct answer from the choices listed above is the second option. The statement that best characterizes chemical reactions would be that their rates vary significantly. Each reaction has its own rate and it depends on the conditions the reactants are subjected to. Hope this answers the question.

Posted in Chemistry

Which statement about van der Waals forces is true?

Van der Waals forces' is a general term used to define the attraction of intermolecular forces between molecules. They  are the residual attractive or repulsive forces between molecules or atomic groups that do not arise from a covalent bond, or ionic bonds. Hope this answers the question.

Posted in Chemistry

Identify the group of elements that corresponds to the following generalized electron configuration: [noble gas]ns 2 (n−1)d 2

For the answer to the question above, I think you are referring to the group of four elements. The Titanium, Zirconium, Hafnium and lastly the Rutherfordium are the group of elements that corresponds to the configuration you are asking.
I hope my answer helped you

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds? It can be shaped into wires. It has a low melting point. It conducts electricity when in solid form. It conducts electricity when it is dissolved in water.

Answer: Option (D) is the correct answer.

Explanation:

A ionic compound will have opposite charges on the 2 atoms attached to each other.

When ionic compound is in solid state then atoms will be more closer to each other and also due to the opposite charges the molecules will have strong force of attraction between them.

In order to conduct electricity, free movement of ions is required. So, a solid with ionic bonds is not able to conduct electricity as molecules or ions are closely held together.

Whereas when a substance that is composed of atoms that are held together by ionic bonds is dissolved in water then its ions will start to move freely from one point to another. Thus, this solution will be able to conduct electricity.

Thus, we can conclude that out of the given options, conducts electricity when it is dissolved in water displays a property of a substance that is composed of atoms that are held together by ionic bonds.

Posted in Chemistry

Which fat is most likely a solid at room temperature? one that is saturated one that is unsaturated one with double bonds one that contains no hydrogen

Answer: Option (a) is the correct answer.

Explanation:

When a fat contains high proportion of fatty acid molecules which have no double bonds then it is known as a saturated fat.

For example, animal fats are mostly saturated.

Fats which are solid at room temperature are known as solid fats. Butter, beef fat etc are all solid at room temperature. Most of the animal food gives solid fats.

Thus, we can conclude that saturated fat is most likely a solid at room temperature.

Posted in Chemistry

Which grouping has the least complex body plan? If you were on a research expedition in the kingdom of Tonga, a coral atoll in the South Pacific, would you find these organisms?

YES, I WOULD FIND THOSE ORGANISMS.

The Kingdom of Tonga is a Polynesian Archipelago in Oceania consisting of 176 islands. During a month long coral reef research mission in Tonga, the Foundation focused on islands in the Ha’aipi group, Vava’u and Niuatoputapu. Haʻapai, directly west of the Tonga trench in the central part of Tonga, is made up of 51 volcanic islands and includes Kao, the highest point in the kingdom (1,046 m). Vavaʻu has one large island and 40 smaller ones, and includes the second largest city, a large harbor.  The north side of the main island is lined by 200 m high cliffs and extensive open network of fjord-like channels that stretch inland on the north side. Nearly 300 km north of Vavaʻu, close to the border of Samoa is Niuatoputapu, a sparsely inhabited (population 150)  eroded remnant of a volcano surrounded by a large uplifted reef. This island was badly damaged by a tsunami following a submarine earthquake off Samoa in 2009.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

What does newtons third law say about why momentum is conserved in collisions?

Newton's third law of motion is naturally applied to collisions between two objects. In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction.For such a collision, the forces acting between the two objects are equal in magnitude and opposite in direction

Posted in Chemistry

The four fundamental types of organic molecules are nucleic acids, proteins, lipids, and Blank Space __________. A.phosphates B.nitrates C.sulfates D.carbohydrates

D. Carbohydrates

This is the fourth macro-molecule being described.

If this answer helped you, please vote me as brainliest!

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Chemistry

Given the data in the accompanying table, what is the reaction order for B? A) zero B) first C) second D) third

Answer: The order with respect to B is

Explanation: Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

Rate=k[A]^x[B]^y

k= rate constant

x = order with respect to A

y = order with respect to B

n = x+y = Total order

a) From trial 1: 20=k[0.20]^x[0.10]^y    (1)

From trial 2: 40=k[0.20]^x[0.20]^y    (2)

Dividing 2 by 1 :\frac{40}{20}=\frac{k[0.20]^x[0.20]^y}{k[0.20]^x[0.10]^y}

2=2^y,2^1=2^y therefore y=1.

Thus order with respect to B is 1.

Posted in Chemistry

Which of the following molecules has correctly labeled bond dipoles?

The bond dipole moment uses the idea of electric dipole moment to measure the polarity of a chemical bond within a molecule. It occurs whenever there is a separation of positive and negative charges. In the diagram above, option B exhibited a bond dipole moment. I hope this helps.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements