read the prompt and question. then, choose the option with the correct answer. elena from new york city wants to spend a few months helping her aunt in honduras. her aunt is very sick, and elena has the time now to assist her before she goes to college. elena does not know when she will return. what may be the best suggestion for elena? comprar un boleto de vuelta comprar un boleto ida y vuelta comprar un boleto de ida comprar un boleto para crucero

Answer:

500 moles

Explanation: moles=grams

Answer:

Graph? Question is incomplete.

Answer:

5 atoms are in each molecule of calcium carbonate

Answer:

B and C

Explanation:

is it multiple choice question??

Van der Waals forces are the interaction between the molecules and the atoms. It increases with an increase in the molecular size and the number of electrons. Thus, options B and C are correct.

Van der Waals forces are the weak forces of attraction and repulsion present between the atoms and the molecules of the compounds. They are also called London Dispersion Forces and dipole-dipole forces.

An increase in the number of electrons and size of the molecule increases the surface area and the electron cloud which in turn, increases the Van der Waals force.

The intermolecular force increases as in large atoms or molecules the valence are held loosely as they are far from the nucleus or the center of the atom.

Therefore, the size and the electron increase the Van der Waals force.

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7g/mL

Density is a measure of mass per volume.

Density Formula

The density formula is  \(\displaystyle D=\frac{m}{V}\) where m is the mass in grams (g) and V is the volume in milliliters (mL). The way I learned the formula was that the m over the V looks like a heart when written out.

We can plug the mass and volume we were given to solve for density.

\(\frac{14}{2}\) equals 7. So, the density must be 7 grams per milliliter (g/mL).

Density Units

The units for density are important. You will not get the correct answer if you do not include your units. There are multiple ways to express density, but it is most common to have g/mL.

Additionally, density should always have the volume measurement in the denominator. This means that density will never be written in mL/g.

Explanation

To find the molar mass of sulfur dihydride, you will need to find the sum of all the atomic masses making up sulfur dihydride.

sulfur dihydride is H2S.

Atomic mass of H = 1,00784 u

Atomic mass of S = 32,065 u

Molar mass = (1.00784 x 2) + 32,065 = 34.081 g/mol

Answer

34.081 g/mol

We can estimate that 2.1 moles of Al2(SO4)3 comprise roughly 1.263 x 1024 particles of the material.

The quantity of a substance is frequently expressed in terms of moles. There are a lot of particles in one mole of any substance—roughly 6.02 x 1023 particles per mole.

If we multiply 2.1 moles of Al2(SO4)3 by Avogadro's number, we may translate it to the number of particles. The number of Al2(SO4)3 ions found in 2.1 moles of the compound, or 1.263 x 1024 particles, are obtained.

In conclusion, we can estimate that 2.1 moles of Al2(SO4)3 comprise roughly 1.263 x 1024 particles of the material.

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Answer:

When you bake a cake the smell changes after it has been baked and it counts as a chemical change

Explanation:

The new pressure is 81.675 torr

Since temperature and moles are held constant, we use Boyle's Law:

A gas law known as Boyle's law asserts that a gas's pressure is inversely proportional to its volume when it is held at a fixed temperature and of a given mass.

To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another.

The Anglo-Irish chemist Robert Boyle proposed Boyle's law in the year 1662.

P1V1=P2V2. Simply plug in your values. The units can remain in torr. Converting to atmospheres is not needed.

(242 torr)(27.0 L)=P2(80.0 L)

P2=[(242)(27)]/80 = 81.675 torr

Hence The new pressure is 81.675 torr

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Adding NaCl to a solution of AgCl will increase the solubility of AgCl. This is because NaCl is a stronger electrolyte than AgCl, and adding it to the solution will increase the overall ionic strength of the solution.

This will make it easier for the Ag+ and Cl- ions to remain in solution, and thus increase the solubility of AgCl.Adding NaCl to a solution of AgCl will increase the overall concentration of chloride ions in the solution. This will cause the AgCl to become more soluble and the solution will become more saturated. As the solution becomes more saturated, the AgCl will precipitate out of the solution.

Consider the solubility equilibrium of AgCl in water.

AgCl(s) ↔ Ag+(aq) + Cl-(aq)

The addition of NaCl to the solution will shift this equilibrium to the left, causing the AgCl to precipitate out. The NaCl will compete with the Ag+ for the Cl- ions, causing the AgCl to fall out of solution.The addition of NaCl will also increase the overall ionic strength of the solution, which can impact the solubility of other salts in the solution.

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The statements that are correct about Diastereomers are:

Diastereomers are those compounds that have the same molecular formula but are not mirror images of each other.

Examples of diastereomers include:

Therefore Diastereomers are not mirror images of each other and have the same molecular formula.

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2 moles of H2 react with 1 mole of O2 gas, according to the balanced reaction. the stoichiometric ratio of the moles of H2 to the moles of O2 is 2:1 as a result.

When all of the reactants are consumed and none are left after the chemical reaction has finished, it is said to have occurred in a stoichiometric chemical reaction.

Stoichiometry can be summed up as the process of calculating the products and reactants of a chemical reaction. It primarily has to do with numbers. Stoichiometry is a fundamental concept in chemistry that makes it easier to use balanced chemical equations to ascertain the amounts of reactants and products.

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Answer:

because it could be harmful and dangerous for our health. like some substances can be acid so if we taste it we can die.

Explanation:

Answer:

Explanation:

There are several reasons why we should not taste unknown substances:

Health risks: The unknown substance may be toxic or harmful to our health, and tasting it can lead to serious health issues or even death.

Allergic reactions: We may be allergic to some substances, and tasting them can cause severe allergic reactions.

Unpleasant taste: The substance may have a terrible taste, and tasting it can cause discomfort or nausea.

Contamination: The unknown substance may be contaminated, and tasting it can lead to the spread of harmful bacteria or viruses.

Legal issues: Tasting unknown substances can be illegal in some cases, such as trying drugs or other illegal substances.

In conclusion, it is always advisable to avoid tasting unknown substances. If you come across something you are unsure about, it is best to seek professional help or advice rather than risking your health or safety.

Answer:

B. pulmonary circulation

Explanation:

just a guess

Answer:

4

Explanation:

its a rare element, usually occurring as a product of the spallation of larger nuclei that have collided with cosmic rays

Answer:

there are 37 atoms

Explanation:

The formula for nickel(II) acetate tetrahydrate is Ni(C2H3O2)4. To calculate the number of atoms in the formula, we need to count the number of atoms of each element and then multiply each by the number of times it appears in the formula.

Ni: There is 1 Ni atom in the formula.

C: There are 8 C atoms (4 from each C2H3O2) in the formula.

H: There are 12 H atoms (3 from each C2H3O2) in the formula.

O: There are 16 O atoms (4 from each C2H3O2) in the formula.

Therefore, the total number of atoms in the formula is 1 + 8 + 12 + 16 = 37.

So there are 37 atoms in Ni(C2H3O2)4.

Answer:

They each have the same number of protons.

Explanation:

Answer:

They each have the same number of protons

Explanation:

All uranium isotopes have 92 protons in their nucleus. However, they differ in the number of neutrons in the nucleus, hence this also translates to varying mass numbers (which is the sum of neutrons and protons in the nucleus). The most common isotopes of uranium are; U-238, U-235, and U-234

Temperature stays the same during state of matter change. After plotting the graph of temperature vs time and the curve is outlined, the moment the graph plateaus read the temperature that is constant(repeatedly occurs).

From the points given in the table of value, am sure the melting point is 78°C.

All the best!

Answer:  The two elements on the periodic table that may be produced in sad reactions are Oxygen and Nitrogen.

Explanation:

Both of these elements are part of the air we breathe and are required for survival, but under certain conditions, they can lead to sad reactions. Oxygen is required for respiration, but when it reacts with other substances in the body, it can lead to the production of free radicals, which can damage cells and cause mood disorders. Nitrogen is also required by the body, but when it reacts with oxygen and other substances in the air, it can lead to the formation of air pollutants, such as smog and ozone, which can also contribute to sad reactions.

Answer:

Aluminium metal reacts vigorously with all the halogens to form aluminium halides. So it reacts with chlorine, bromine, and iodine.

Answer:

exosphere thermosphere mesosphere stratosphere troposphere

Answer:

0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

Explanation:

The balanced chemical equation for the reaction of hydrogen and nitrogen to form ammonia is:

N2(g) + 3H2(g) → 2NH3(g)

To determine how many moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen, we need to use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to convert the volume of hydrogen gas to moles using the ideal gas law equation:

n = PV/RT

where P is the pressure in atm, V is the volume in liters, R is the gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

n = (1.2 atm)(4.0 L)/(0.0821 L·atm/mol·K)(50.0°C + 273) = 0.174 mol H2

Since there is excess nitrogen, all of the hydrogen will react to form ammonia. Using the mole ratio between NH3 and H2 from the balanced chemical equation:

2 mol NH3 / 3 mol H2

we can calculate how many moles of NH3 will be produced:

n(NH3) = (0.174 mol H2) × (2 mol NH3 / 3 mol H2) = 0.116 mol NH3

Therefore, 0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

Answer:

I think the density of the object determines if it floats or sinks

The element is a metal

What is a metal ?

Metals are generally crystalline solids. In maximum cases, they have got a fantastically simple crystal structure prominent via way of means of a near packing of atoms and a excessive diploma of symmetry. Typically, the atoms of metals incorporate much less than 1/2 of the whole supplement of electrons of their outermost shell. Because of this characteristic, metals generally tend now no longer to form compounds with every other. They do, however, integrate extra with ease with nonmetals

Typical physical properties of metals :

high melting points.

good conductors of electricity.

good conductors of heat.

high density.

malleable.

ductile.

The element is a metal

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Answer:

The change in entropy is negative; -ΔS

Explanation:

The entropy of a system measures the degree of randomness or energy dispersal of the system. The symbol for entropy is S.

For a given system, the change in entropy is symbolized as ΔS.

For an increase in entropy of a system, the final entropy must be greater than the initial entropy  i.e. Δfinal > Δinitial. Therefore ΔS > 0

For a decrease in entropy of a system, the final entropy must be less than the initial entropy  i.e. Δfinal < Δinitial. Therefore ΔS < 0 or ΔS is negative

A system with decreasing entropy may have a positive or negative free energy change, ΔG.

Also, a system with decreasing entropy may have a positive or negative enthalpy change, ΔH.

Answer:

Se Puede Traducir?

Explanation:

Mmm?

Answer:

i think it is surroundings

Answer:

N2 + O2 → 2NO is an oxidation-reduction reaction.

Explanation:

An oxidation-reduction reaction (also know as Redox reaction) is a type of chemical reaction that involves a transfer of electrons between two species. It occurs when the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.

We will consider the equations one after the other.

Oxidation numbers of the individual element on the reactant side:

KOH : K = +1, O = -2, H = +1

HNO3 : H = +1, N = +5, O = -2

Oxidation numbers of the individual element on the product side:

H2O: H = +1, O = -2

KNO3: K = +1, N = +5, O = -2

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

CaCl2 : Ca = +2, Cl = -1

Na2SO4: Na = +1, S = +6, O = -2

Oxidation numbers of the individual element on the product side:

CaSO4: Ca = +2, S = +6, O = -2

NaCl: Na = +1, Cl = -1

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

AgNO3: Ag = +1, N = +5, O = -2

NaCl: Na = +1, Cl = -1

Oxidation numbers of the individual element on the product side:

AgCl: Ag = +1, Cl = -1

NaNO3: Na: +1, N = +5, O = -2

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

Al2(SO4)3: Al =+3, S = +6, O = -2

KOH: K = +1, O = -2, H = +1

Oxidation numbers of the individual element on the product side:

Al(OH)3: Al =+3, O = -2, H = +1

K2SO4: K = +1, S = +6, O = -2

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

N2: N = 0

O2: O = 0

Oxidation numbers of the individual element on the product side:

NO: N = +2, O = -2

There are changes in the oxidation numbers, hence, it is an oxidation-reduction reaction.

The following is an oxidation-reduction reaction - N2 + O2 → 2NO

Oxidation numbers represent the potential charge of an atom in its ionic state. If the oxidation number decreases in a reaction, it is reduced. If an atom's oxidation number increases, it is oxidized.

= > Oxidation state of N in the reactant is 0

=> Oxidation state of N in the product is +2

So, N is oxidized

=> Oxidation state of O in the reactant is 0

=> Oxidation state of O in the product is -2

So, O is reduced

Thus, the following is an oxidation-reduction reaction - N2 + O2 → 2NO

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Among the given gases, the gas that shows the greatest deviation from ideal behavior at 25 degrees Celsius and 1 atm is likely to be H2 (hydrogen).

1. Size and shape of molecules: Hydrogen gas (H2) consists of diatomic molecules that are very small in size. The size of the hydrogen molecule is relatively larger compared to other gases such as CH4 (methane), SO2 (sulfur dioxide), and O2 (oxygen). The small size of hydrogen molecules leads to a higher probability of molecular interactions and deviations from ideal behavior.

2. Intermolecular forces: Hydrogen gas has relatively weak intermolecular forces compared to other gases. Although it exhibits London dispersion forces, these forces are not as strong as the dipole-dipole interactions in molecules like SO2 and CH4 or the formation of double bonds in O2. The weaker intermolecular forces in hydrogen contribute to larger deviations from ideal behavior.

Based on the size and shape of molecules as well as the strength of intermolecular forces, hydrogen gas (H2) is expected to show the greatest deviation from ideal behavior among the given gases at 25 degrees Celsius and 1 atm.

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Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state