When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water according to the reaction below. How many grams of water were formed? (Hint: This answer will have 3 SF.)

2H2+O2 ⇒ 2H2O

54.0 g
6.01 g
0.0185 g
0.167 g

The answers would be 3 and 2 so the subscripts would both equal 6.

Answer: [tex]3O_2(g)\rightarrow 2O_3(g)[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation for the given reaction will be:

[tex]3O_2(g)\rightarrow 2O_3(g)[/tex]

where the (g) stands for the state of reactants and products which is gaseous.

D) mass of snake after feeding is equal to orginal mass of snake plus mouse since the mass is conserved

The law of conservation for the feeding of mice by snake by Dr. Martin states the mass of snake after feeding being equivalent to the mass of snake before plus the mass of mice. Hence, option D is correct.

The law of conservation is given as the state in which the quantity can neither be created nor  be destroyed.

The mass as the physical quantity in the chemical reaction founds to be conserved and not lost.

Thus, for the consumption of the mice by the snake according to the law of conservation stated by Dr. Martin, that the mass of snake after feeding mice will be the sum of the mass of snake before and the mass of mice. Thus, option D is correct.

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Elk Cloner: The program with a personality. It will get on all your disks. It will infiltrate your chips. Yes, it's Cloner! It will stick to you like glue. It will modify RAM to send in the Cloner.

Answer:

Elk cloner is a computer virus designed for Apple II. This virus spreads by infecting the disks of computer operating systems. Although this virus was not primarily programmed to cause damage, it could corrupt discs by overwriting reserved tracks regardless of content. If a computer is infected with this virus, at startup it will receive the following message:

Elk Cloner: The program with personality

You will get all your records

it will get into your chips

Yes, it is Cloner!

It will stick to you as glue

will also change your RAM

Pass it on, Elk Cloner!

The answer is inversely

Answer:

Option (b) "inversely

"

Explanation:

The energy of a photon is given by :

[tex]E=\dfrac{hc}{\lambda}[/tex]

Where

h is the Planck's constant

c is the speed of light

[tex]\lambda[/tex] is the wavelength

Or it can be written as :

[tex]E=h\nu[/tex].....(1)

[tex]\nu[/tex] is the frequency.

Equation (1) can be rearranged as :

[tex]h=\dfrac{E}{\nu}[/tex]

So, it is clear that Planck's constant relates the energy in one photon of electromagnetic radiation is inversely proportional to the frequency of the radiation. Hence, the correct option is (b) "inversely".

Answer:

The correct answer is option C

Explanation:

Pure water at 25°C self-ionizes to form an equilibrium in which. Option C is correct. This is further explained below.

Generally, ionization is simply defined as any process that turns electrically neutral atoms or molecules into electrically charged ones.

In conclusion, At 25°C, pure water self-ionizes to establish an equilibrium in which

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Answer:

V₂ = 14.56 mL.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R  is the general gas constant,

T is the temperature of the gas in K.

(P₁*V₁) / T₁ = (P₂ * V₂) / T₂

V₁  =  80.0 mL, P₁ = 0.20 atm, T₁ = 27  °C + 273 = 300 K.

V₂  =  ??? mL, P₂ (STP) = 1.0 atm, T₂ (STP) = 0 °C + 273  =  273 K.

Applying in the above equation

(P ₁* V₁) / T₁ = (P₂ * V₂) / T₂

(0.20 atm * 80.0 mL) / 300 K= (1.0 atm  * V₂) / 273 K

V₂ = (0.20 atm * 80.0 mL * 273 K) / (300 K * 1.0 atm)

V₂ = 14.56 mL

So, the answer is: V₂ = 14.56 mL.

The gas volume at STP will be approximately 14.56 mL, derived using the combined gas law.

To solve this problem, we need to use the combined gas law, which is expressed as:

(P1 * V1) / T1 = (P2 * V2) / T2

Given:

We need to find the final volume V2 at STP.

Rearranging the combined gas law to solve for V2:

V2 = (P1 * V1 * T2) / (P2 * T1)

Plugging in the values:

V2 = (0.200 atm * 80.0 mL * 273 K) / (1 atm * 300 K)

V2 = (4368 mL * K) / (300 K)

V2 ≈ 14.56 mL

Thus, the volume of the gas at STP is approximately 14.56 mL.

Answer:0.75 atm

Explanation: 0.75 atm is the pressure if the gas

Answer:

a

Explanation:

Answer: Option (b) is the correct answer.

Explanation:

A balanced equation is defined as the equation where number of atoms of the reactant equal to the number of atoms of the product.

This also means that mass of the reactants is equal to the mass of products in a chemical equation.

For example, [tex]2Na + Cl_{2} \rightarrow 2NaCl[/tex]

Total mass of reactants = [tex][(2 \times 23) + (35 \times 2)] g/mol[/tex]

                                      = 116 g/mol

Total mass of products = [tex]2 \times (23 + 35)[/tex] g/mol

                                      =  116 g/mol

Hence, mass if conserved in a chemical reaction.

thus, we can conclude that a balanced chemical equation shows the proportions of reactants and products necessary for mass to be conserved.

Answer:

a. +6;

b. +5;

c. +3.

Explanation:

Start with elements with well-known oxidation states.

The oxidation state on oxygen O in compounds is mostly -2. Common exceptions include:

The oxidation state on group 1 metals (Li, Na, K, etc.) in compounds is mostly +1.

The oxidation state on group 2 metals (Be, Mg, Ca, etc.) in compounds is mostly +2.

Barium Ba is a group 2 metal. The oxidation state on Ba in the compound BaSO₄ is expected to be +2.

The oxidation state on hydrogen H in compounds is mostly +1. The oxidation state on H might be negative when it is bonded to metals.  

The oxidation state on halogens (F, Cl, Br, etc.) is mostly -1. The oxidation state may vary when the halogen is bonded to oxygen or another halogen element.

Compounds are neutral. The oxidation state on all atoms in a compound shall add up to 0. Both BaSO₄ and HClO₂ are neutral.

Oxidation states:

Let the oxidation state on S be x.

2 + x + 4 × (-2) = 0;

x = 6.

Hence, the oxidation state on S in BaSO₄ is +6.

Oxidation states:

Let the oxidation state on Cl be x.

Refer to the equation in BaSO₄ as an example. Try setting up the equation on your own.

x = 3.

Hence, the oxidation state on Cl is +3.

Ions carry charge. Oxidation states on atoms in an ion shall add up to the charge of the ion. The superscript of an ion shows its charge. The superscript 3- in the phosphate ion shows that the ion carries a charge of -3.

Oxidation states:

Let the oxidation state on P be x.

x + 4 × (-2) = -3;

x = 5.

Hence, the oxidation state on P is +5.

Answer:

It's a.

Explanation:

The reaction will proceed at an increasing rate.

The effect that does super critical mass have on a nuclear reaction, the reaction to have on a nuclear reaction, the reaction rate increases. The correct option is a.

Nuclear reaction is the reaction in which two nuclei are combined to form nuclides or one nuclei combine with a subatomic particle to form nuclides.

There are four types of nuclear reaction, fission, fusion, decay and transmutation.

Thus, the correct option is a, the reaction rate increases.

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Answer:

Gases tend to deviate from ideal gas law at high pressures and low temperatures.

Explanation:

The main statements from molecular kinetic theory to describe an ideal gas is that 1) the gas particles occupy a neglictible fraction of the total volume of the gas, and 2) there is not force of attraction between gas particles.

HIgh pressure means that the gas particles will be forced  closer to each other, making that the mean distance between the particles be realtively more important and their volume less neglictible. This is a violation the first assumption described above.

Since the temperature is directly related to the kinetic energy, and the latter with the movement of the particles (average speed), low temperatures lead to the molecules being less independent of each other, i.e. the forces between the molecules will count more . This fact constitutes a violation of the second principle established in the first paragraph.

In conclusion, high pressures and low temperatures tend to deviate gases from the ideal gas law.

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Answer:

Explanation:

1. A mixture that does not have a uniform composition and the individual components remain distinct.

HETEROGENEOUS

An heterogeous mixture is a mixture with components in different phases.

2. A mixture that does have a uniform composition throughout and is always in the same state.

HOMOGENOUS

Homogenous mixtures have just one phase that is uniform all through.

3. A substance that will not dissolve in a solvent.

INSOLUBLE

When a solute cannot dissolve in a solvent to form a solution, we say it is insoluble.

4. A homogeneous mixture

SOLUTION

Solutions are made up of homogenous mixtures solute and solvent.

5. A molecule with no internal charge variation due to bonding.

NON-POLAR

Even distribution of charges especially between species whose electronegativity difference is 0 would lead to the formation of a non-polar compound. Here,

6. A molecule with an uneven distribution of charge due to unequal sharing of electrons during bonding

POLAR

Unequal sharing of electrons forms a polar compound. The more electronegative attracts the shared electron to itself and there is separation of charges. This leads to polarity.

7. A solution which has dissolved as much solute as it can at a particular temperature.

SATURATED

A saturated solution cannot dissolve more solute beacuse it contains enough solute as it can dissolve at a temperature.

8. A solution which is still able to dissolve solute.

UNSATURATED

An unsaturated solution is able to dissolve more solute.

A mixture that does not have a uniform composition and the individual components remain distinct is called a heterogeneous mixture. A mixture that does have a uniform composition throughout and is always in the same state is called a homogeneous mixture or solution. A substance that will not dissolve in a solvent is referred to as insoluble.

1. A heterogeneous mixture is a mixture that does not have a uniform composition and the individual components remain distinct. For example, a mixture of oil and vinegar is heterogeneous because you can see separate layers of oil and vinegar.

2. A homogeneous mixture, also known as a solution, is a mixture that does have a uniform composition throughout and is always in the same state. An example is a sugar dissolved in water. The sugar particles are evenly distributed throughout the water.

3. Insoluble refers to a substance that will not dissolve in a solvent. For instance, sand is insoluble in water, meaning it does not dissolve in water.

4. A solution is considered saturated when it has dissolved as much solute as it can at a particular temperature. Any additional solute added will not dissolve and will form a precipitate.

5. A nonpolar molecule is a molecule with no internal charge variation due to bonding. Examples include methane (CH4) and carbon dioxide (CO2).

6. A polar molecule is a molecule with an uneven distribution of charge due to unequal sharing of electrons during bonding. Water (H2O) is a polar molecule because the oxygen atom attracts electrons more strongly than the hydrogen atoms.

7. An unsaturated solution is a solution that is still able to dissolve solute. It has not yet reached its maximum capacity to dissolve solute.

8. A heterogeneous mixture is a mixture that does not have a uniform composition and the individual components remain distinct. An example is a mixture of oil and water. The oil and water do not mix and separate into distinct layers.

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Answer:

1.874 M.

Explanation:

Molarity is defined as the no. of moles of a solute per 1.0 L of the solution.

M = (no. of moles of solute)/(V of the solution (L)).

∴ M = (mass/molar mass)of NiCl₂/(V of the solution (L)).

∴ M = (mass/molar mass)of NiCl₂/(V of the solution (L)) = (85.0 g / 129.59 g/mol)/(0.35 L) = 1.874 M.

Answer: true

Explanation:

Final answer:

The statement about serving hot tea in china tea cups is a cultural preference deeply rooted in Chinese history and the appreciation for fine porcelain from the Song dynasty, highlighting the importance of tradition in the enjoyment of tea.

Explanation:

The statement "Hot tea is best when served in china tea cups" touches upon aspects of culture, history, and personal preference rather than an objective truth. From the perspective of Chinese culture and history, true porcelain, invented in the Song dynasty, became a treasured export product.

The use of china tea cups is often associated with maintaining the temperature and enhancing the flavor of tea due to its thin walls and smooth surface. Additionally, Ceylon tea, known for its purity, along with the ritualistic and cultural aspects surrounding tea consumption, illustrate the historical significance and personal nature of tea drinking preferences. Therefore, the belief that hot tea is best served in china tea cups can be seen as a cultural preference rather than an absolute truth.

Answer: its A

Explanation:

Answer: Option A

Explanation:

One gene one enzyme hypothesis was proposed by George Wells Beadle in which he stated that one gene directly affects the production of the  single enzyme.

This consequently affects the individual step in the whole metabolic pathway.  

So, a mutation in the single gene will lead to the production of the faulty protein. The step of the metabolism will be affected in which the faulty enzyme will participate.

Answer:

the anwser is c

Explanation:

aerobic = air

anerobic= does not

Answer: Option (C) is the correct answer.

Explanation:

In a cell, when glucose breaks down by the use of oxygen and yields carbon dioxide, water along with release of energy is known as aerobic respiration.

For example, in the mitochondria aerobic respiration takes place.

On the other hand, in a cell when glucose breaks down without the use of oxygen then it yields alcohol, carbon dioxide along with release of energy is known as anaerobic respiration.

For example, yeasts respire anaerobically.

Therefore, we can conclude that the main difference between aerobic respiration and anaerobic respiration is that aerobic respiration requires oxygen, and anaerobic respiration does not.

Number of your protons in an atom

The number of Protons

Answer:

The correct answer from the choices, which are included in the comments section, is:

Explanation:

Let's go through every choice from the list:

A. Easier to understand:

Incorrect.

Quantum model is not quite easy to understand. On the contrary, it is complex and quite hard to understand.

John Dalton's model was the first scientific model of the atom. It depicted the atom as indivisible, extremely tiny particles that constitute all matter.

Many facts were discovered later: the atom is not indivisible, there are some subatomic particles (electrons, protons and neutrons), the electrons are not in fixed positions (orbits) that were progresively explained by new models: J.J Thomson's model, Ernest Rutherford's model, Niels Bohr's model, and, the last and current one, the quantum model/

So. it is not easier to understand but more complete.

b. is a more recent theory

Incorrect.

As said, John Dalton's theory was the first scientific theory of the atom. It was developed in the first half of XIX century. It is, definetly, no a more recent theory. Modern-day quantum model is the most recent theory of the atom.

C. Can be represented in two dimensions

Incorrect.

Modern-day quantum model represents the electrons in a 3-D arrangement around the atom's nucleus, like a "cloud" without definite size. Two dimensional representation is not a characteristic that defines how the modern-day quantum model of the atom is better than other models.

D. Answers many questions about atoms

Correct. Indeed, every model of the atom after John Dalton's model explains more facts about the atoms: J.J Thomson's explained that the negative charges are particles inside the atom (electrons); Ernest Rutherford's model explained the existence of the nucleus with protons, while the electrons are surrounding the atom; Bohrs model explained that the electrons cannot decay into the atoms' nuclei, because they can only have certain enery levels; and the modern-day quantum model explains much more facts than any previous one, specially about the behaviour of the subatomic particles.

The ideal gas law has the power to unravel any enigmatic gas law enigma. The captivating gas law intertwines the connections between pressure, volume, temperature, and the multitude of moles of gas.

It is conveyed through the equation PV = nRT, where P symbolizes pressure, V signifies volume, n represents the count of moles, R stands for the ideal gas constant, and T embodies temperature.

This equation empowers us to compute any of the four variables (pressure, volume, temperature, and number of moles) if we possess knowledge of the other three. It bestows a comprehensive framework for comprehending and prophesying the conduct of gases in diverse circumstances.

The spellbinding gas law can be employed to crack riddles concerning modifications in volume, pressure, or temperature of a gas, as well as enigmas involving the calculation of the number of moles of gas. It is an elemental instrument in the exploration of gases and is extensively applicable in domains such as chemistry, physics, and engineering.

In summary, the ideal gas law is an adaptable equation that encompasses the bonds between pressure, volume, temperature, and the multitude of moles of gas, rendering it the paramount preference for unraveling a vast array of gas law enigmas.

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Answer:

Explanation:

A polar covalent bond is the result of uneven distribution of the electrons involved in the covalent bond.

The polar character of a covalent bond is determined by the difference in the electronegativities of the atoms bonded.

The higher the electronegativity difference of the two bonded atoms the more polar the covalent bond is.

Then, you need to find and compare the electronegativies of the atoms bonded.

This is the list of electronetativities of every atom in the question:

Using that list you can do these calculations:

Bond           Electronegativity difference

a) B–H          2.20 - 2.04 = 0.16

b) N–H         3.04 - 2.20 = 0.84

c) P–H          2.20 - 2.19 = 0.01

d) Al–H        2.20 - 1.61 = 0.59

e) C–H         2.55 - 2.20 = 0.35

Thus, the greatest electronegativity difference is that of N - H, 0.84, which indicates that this is the most polar bond from the choices.

The most polar bond among the given options is N-H.

The most polar bond among the given options is N–H.

The polarity of a bond is determined by the difference in electronegativity between the two atoms involved. Nitrogen (N) has a higher electronegativity compared to the other elements in the choices, and hydrogen (H) has a lower electronegativity. The greater the electronegativity difference, the more polar the bond.

For example, in a N–H bond, nitrogen attracts the shared electrons more strongly than hydrogen, resulting in a partial negative charge on nitrogen and a partial positive charge on hydrogen.

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Answer:

[tex]\boxed{\text{3.54 ng/L}}[/tex]

Explanation:

At equilibrium we have

[tex]\begin{array}{cccccc} &\text{Co}_{3}\text{(PO}_{4})_{2} & \rightleftharpoons &3\text{Co}^{2+}&+ & 2\text{PO}_{4}^{3-}\\\text{I:}& & & 0 & & 0.029\\\text{C:}& & & +3s & & 0.029 + 2s \\\text{E:}& & & 3s & &0.029+2s\\\end{array}[/tex]

[tex]K_{sp} = [\text{Co}^{2+}]^{3}[\text{PO}_{4}^{3-}]^{2}= 2.05\times10^{-35}\\\\(3s)^{3}\times (0.029 + 2s)^{2} = 2.05\times10^{-35}[/tex]

Assume that s ≪ 0.029. Then

[tex]27s^{3}\times (0.029)^{2} = 2.05\times10^{-35}\\\\2.27 \times 10^{-2}s^{3} = 2.05\times10^{-35}\\\\s^{3}= 9.028\times10^{-34}\\\\s = \sqrt[3]{9.028\times10^{-34}}= 9.665\times10^{-12}[/tex]

[tex]s = \dfrac{9.665\times10^{-12}\text{ mol}}{\text{1 L}}\times \dfrac{ \text{366.73 g} }{\text{1 mol}}\\\\ = 3.54\times 10^{-9} \text{g/L} = \text{ 3.54 ng/L}[/tex]

The solubility of cobalt(II) phosphate is [tex]\boxed{\textbf {3.54 ng/L}}[/tex].

Answer:

The answer is urine (A)

Explanation:

The strong acid and strong base has high rate constant of dissociation. The rate constant for weak acid and base for the dissociation is low, they do not easily dissociate in water. Therefore, option A is the correct option.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base releases hydroxide ion OH⁻ ion when dissolved in water.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. Strength of acidic nature is directly proportional to the concentration of hydronium ion.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. Temperature affect the pH. At room temperature pH scale is between 0 to 14. 7 is the pH of neutral solution. Urine among all the given option  would have the highest pOH level.

Therefore, option A is the correct option.

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You haven't provided a list of answers but the law to which states "volume of gas is proportional to the number of moles of gas," is Avogadro's law.

Answer:D - adding a catalyst

Explanation:

In this analogy, adding more students is analogous to adding more particles of reactants in a chemical reaction. Shrinking the hallways is analogous to decreasing the volume of the reaction container. A chemical catalyst helps change the rate of a chemical reaction by decreasing the activation energy.

Question 1: Adding more students in this analogy is analogous to adding more particles of reactants in a chemical reaction. Just like adding more students can increase the amount of activity and interactions in a classroom, adding more particles of reactants can increase the collision frequency and hence the reaction rate.

Question 2: Shrinking the hallways in this analogy is analogous to decreasing the volume of the reaction container in a chemical reaction. Just like shrinking the hallways restricts the movement of students, decreasing the volume of the reaction container restricts the movement of particles and increases the collision frequency.

Question 3: A chemical catalyst helps change the rate of a chemical reaction by decreasing the activation energy required for the reaction to occur. It provides an alternate reaction pathway with a lower activation energy, allowing more particles to have sufficient energy to react.

Question 4: Shortening the passing periods in this analogy is analogous to increasing the temperature of the reaction in a chemical reaction. Just like shortening the passing periods allows students to move faster and increases their chances of colliding, increasing the temperature of the reaction increases the kinetic energy of particles and enhances their collision frequency.

Question 5: Hiring a matchmaker in this analogy is analogous to adding a chemical catalyst in a chemical reaction. Just as a matchmaker facilitates the meeting of compatible people, a chemical catalyst facilitates the reaction between reactant particles, increasing the reaction rate.

Question 6: Two conditions that must be met for a chemical reaction to take place are collisions with the proper orientation and sufficient activation energy. Collisions between reactant particles must occur with the proper orientation to enable the formation of new chemical bonds, and these collisions must also have sufficient energy to overcome the activation energy barrier.

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Answer:

303 K

Explanation:

Converting 30 degrees Celsius to Kelvin temperature would come out to 303.15 ; it would not be any higher considering the decimal amount, so it would remain a positive 303 k. Hope this helps!

The Kelvin temperature for 30°C is 303k.

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Answer: 372.5 g KCl

Explanation: balanced equation

2K + Cl2-------> 2KCl

2 mol K produce 2 mol Kcl

5 mol K produce = 5x2/2=5 mol Kcl

Then moles = mass/molar mass

Mass = moles x molar mass= 74.5x5=372.5 g Kcl

Answer:

2 dozen of H₂ particles  + 1 dozen of O₂ particles  → 2 dozen of H₂O particles.

Explanation:

2H₂ + O₂ → 2H₂O.

So, every 2.0 moles of H₂ react with 1.0 mole of O₂ to produce 2.0 moles of H₂O.

So, the represented reaction of the problem is:

2 dozen of H₂ particles  + 1 dozen of O₂ particles  → 2 dozen of H₂O particles.

Answer:

The relationship of pH and concentration of H+ ion is pH = -lg[H+]. So the concentration of H+ is 10^(-2). And [OH-][H+]=10^(-14). pOH + pH = 14. So the right answer is A.

Answer:

i don't see the statement but value is 14

Explanation:

Answer:

D. 2NH₃(g) ⟶ N₂(g) + 3H₂(g)

Explanation:

A chemical equation must show the correct formulas for reactants and products.

A and B are wrong, because they have NH₃ as a product.

C is wrong. H₃ does not exist.

A is correct. The equation for the decomposition of ammonia is

2NH₃(g) ⟶ N₂(g) + 3H₂(g)

2NH₃(g) ⟶ N₂(g) + 3H₂(g) correctly represents the reaction that takes place when nitrogen gas and hydrogen gas are formed as ammonia decomposes. Hence, option D is correct.

A decomposition reaction occurs when one reactant breaks down into two or more products.

This can be represented by the general equation: AB → A + B.

Thus, 2NH₃(g) ⟶ N₂(g) + 3H₂(g) correctly represents the reaction that takes place when nitrogen gas and hydrogen gas are formed as ammonia decomposes.

Hence, option D is correct.

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Answer: There are 8 hydrogen atoms on the product side in the reaction.

Explanation:

Every balanced chemical equation follows law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This law also states that total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side.

For the given reaction, the balance chemical equation follows:

[tex]PCl_5+4H_2O\rightarrow H_3PO_4+5HCl[/tex]

On reactant side:

Number of Phosphorus atoms = 1

Number of Chlorine atoms = 5

Number of Hydrogen atoms = 8

Number of Oxygen atoms = 4

On Product side:

Number of Phosphorus atoms = 1

Number of Chlorine atoms = 5

Number of Hydrogen atoms = 8

Number of Oxygen atoms = 4

Hence, there are 8 hydrogen atoms on the product side in the reaction.

Answer: The correct option is 8 hydrogen atoms

Explanation:

I did the test and got it right