how many moles of nitrogen are there in 6.8 liters at standard temperature and pressure?

Answer:

C its atomic number

Explanation:

Every element has a unique atomic number. The atomic number is always the same for a given element and does not change.

The number of protons in an atom is the atomic number. Protons are located in the nucleus. Being nuclei particles, they do not have a variable number. Their number is fixed and we can easily identify an atom with the number of protons, which is the atomic number.

Answer:

Frogs and toads lose their tails as they develop into adults, but salamanders keep their tails

Explanation:

The salamanders, frogs, and toads are part of the amphibian family. They all live in both water and land. The water is still crucial for their live, despite them being relatively well developed for terrestrial live, with the biggest importance being that their offspring needs it in order to develop. The salamander offspring has only front limbs and tail, thus it can not live on land until it is fully developed, while the frog and toad offspring doesn't have any limbs at the start, only tail, thus not being able to even come out of the water. As they mature, the salamander offspring develops hind limbs as well, while retaining the tail. The frog and toad offspring develops front and back limbs, but its loses its tail.

Answer:

A) Frogs and toads lose their tails as they develop into adults, but salamanders keep their tails

Explanation:

25.6 L of carbon dioxide gas will be produced when 12.8 L of oxygen gas react with excess carbon monoxide. The stoichiometric ratio for oxygen gas and carbon dioxide gas is 1:2. For every mole of O2 consumed, 2 moles of CO2 are formed.

Further Explanation:

The balanced chemical equation for this reaction is:

O2 + 2 CO → 2 CO2

To get the amount of CO2 produced, the following steps must be followed:

Solving the problem,

STEP 1: Convert liters to moles

[tex]moles \ of \ O_{2} \ = given \ volume \ O_{2} \ (\frac{1 \ mole \ O_{2}}{22.4 \ L} )\\moles \ of \ O_{2} \ = 12.8 \ L \ O_{2} \ (\frac{1 \ mole \ O_{2}}{22.4 \ L} )\\\boxed {moles \ of \ O_{2} \ = 0.57143 \ mol}[/tex]

STEP 2: Get the moles of CO2 formed

[tex]moles \ of\ CO_{2} \ = \ given \ moles \ O_{2} \ (\frac{2 \ mol \ CO_{2}}{1 \ mol \ O_{2}})\\moles \ of\ CO_{2} \ = \ 0.57143 \ mol \ O_{2} \ (\frac{2 \ mol \ CO_{2}}{1 \ mol \ O_{2}})\\\\\boxed {moles \ of\ CO_{2} \ = \ 1.14286 \ mol}[/tex]

STEP 3: Convert moles to liters

[tex]liters \ CO_{2} \ = given \ moles \ CO_{2} \ (\frac{22.4 \ L}{1 \ mol \ CO_{2}})\\liters \ CO_{2} \ = 1.14286 \ mol \ CO_{2} \ (\frac{22.4 \ L}{1 \ mol \ CO_{2}})\\\\\boxed {liters \ CO_{2} \ = 25.6 \ L}[/tex]

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Keywords: stoichiometry, STP, gases

Answer:

25.6 liters of [tex]CO_2[/tex] will be produced.

Explanation:

We are given that 12.8 liters of Oxygen gas is reacted with excess Carbon Monoxide to produce of Carbon Dioxide gas, keeping all the volume measurements at the same temperature.

We are to find the number of liters of Carbon Dioxide used in the reaction.

The equation for this reaction will be:

[tex]2 CO + O_2\implies 2 CO_2[/tex]

From the equation, we can see that the mole ratio of Oxygen to Carbon Dioxide is 1:2. Therefore, the number of liters of [tex]CO_2[/tex] will be double the number of liters of Oxygen.

[tex]12.8 \times 2 = 25.6[/tex]

So, 25.6 liters of [tex]CO_2[/tex] will be produced.

Answer:

increasing the number of hydrogen ions.

Explanation:

pH = -log[H⁺].

The average mass of an atom is calculated with the formula:

average mass = abundance of isotope (1) × mass of isotope (1) + abundance of isotope (2) × mass of isotope (2) + ...  an so on

For the boron we have two isotopes, so the formula will become:

average mass of boron = abundance of isotope (1) × mass of isotope (1) + abundance of isotope (2) × mass of isotope (2)

We plug in the values:

10.81 = 0.1980 × 10.012938  + 0.8020 × mass of isotope (2)

10.81 = 1.98 + 0.8020 × mass of isotope (2)

10.81 - 1.98 = 0.8020 × mass of isotope (2)

8.83 = 0.8020 × mass of isotope (2)

mass of isotope (2) = 8.83 / 0.8020

mass of isotope (2) = 11.009975

mass of isotope (1) = 10.012938 (given by the question)

Answer:

Here is the complete statement: The overall change in enthalpy of a reaction depend ONLY ON REACTANTS AND THE PRODUCTS.

Explanation:

Change in enthalpy of a chemical reaction refers to the heat change that is associated with a chemical change when the pressure is held constant. Generally, chemical reaction involves the breaking of chemical bonds in the reactants and the formation of new chemical bonds in the products. The breaking and forming of bonds involve heat change; the amount of heat that is given off and absorb in each chemical reaction depend on the type of reactants and products that are involved in the chemical reaction.

Answer:

A

Explanation:

Answer:

an increase in pressure will result in a decrease in volume

Explanation:

boy's law

Answer:

B. The reaction rate decreases

Explanation:

Increasing the pressure on a reaction involving reacting gases increases the rate of reaction.  

Changing the pressure on a reaction that involves only solids or liquids has no effect on the rate.

If you increase the pressure of a gas, you squeeze it into a smaller volume

Greater density of molecules increases the number of collisions. When you decrease the pressure, molecules don't hit each other as often and the rate of reaction decreases.  

Answer:

A base.

Explanation:

Basic solutions give OH- ions.

Answer:

Explanation:

The equation that you have to complete is:

This is, you have to find the products formed and the coefficients in front of each substance to balance the chemical equation.

Carbon may react with oxygen using oxidation number 2 or 4.

If carbon uses oxidation number 2, the chemical equation is:

If carbon uses oxidation number 4, the chemical equation is:

Normally, an incomplete combustion yields to a mixture of products: both CO and CO₂, and it only happens when the amount of oxygen is limitied.

When there is plenty of oxygen available, the combustion is complete and the only product of the reaction is CO₂.

With that information, and the fact that the list of choices do not include CO as product, you conclude that this is a complete combustion, and the chemical equation is:

So, the choice that completes the chemical equation is CO₂.

Answer:

All atoms of isotopes of a particular element have the same number of protons, but different numbers of neutrons in their nuclei.- True

Answer: True

Explanation:

All isotopes have equal number of protons but differ by number of neutrons in the nucleus. The number of neutrons changes the weight of the elements, but not the atomic number since that is a function of protons. Most isotopes are radioactive and are not stable. Eg C has two isotopes ¹²C and ¹³C, they only varies by number of neutrons and still have the same type of chemical reactivity. But ¹²C is found in nature while ¹³C is radioactive and used in carbon dating.

Answer:

1 is B

Explanation:

Ice is crystalline so when water drops below freezing it forms crystals, I don't know the rest.

Answer:

1. D

2. C

3. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density. More organized in the solid forms verse the liquid form.

Explanation:

1. When temperatures drop below freezing crystals are formed, and crystals = ice. Ice = solid and there are more bonds in ice than there are in water.

2. When ice forms the hydrogen atoms in a water molecule bond with the oxygen atoms in other water molecules.

Answer:

When we decrease temprature and increase pressure on a gas. It liquifies.

when we increase temprature and decrease pressure on liquid gas. It becomes gas again

HOPE IT HELPS U ....

Answer:

B. when volume and the number of particles are constant

Explanation:

According to Gay Lussac law,

For a given amount of gas at constant volume (V) and the number of particles are constant (n)

Pressure is directly proportional to the temperature of the gas.

It is given by the expression  

[tex]P \propto T[/tex] ( at constant V and n)

[tex]\frac {P}{T} =k[/tex] (k is a constant )

When there is a change in the pressure or temperature

The expression is [tex]\frac {P_1}{T_1} =\frac {P_2}{T_2}[/tex]

Where                                

[tex]P_1[/tex] and [tex]P_2[/tex] are initial pressure and final pressure respectively

[tex]T_1[/tex] and [tex]T_2[/tex] are initial and final temperatures respectivley

Please Note:

Directly proportional means when one increases the other one too will increase that is when pressure increases temperature too will increases if volume and number of particles are constant.

Answer:

In this theory, an acid is a substance that can release a proton (like in the Arrhenius theory) and a base is a substance that can accept a proton. A basic salt, such as Na+F-, generates OH- ions in water by taking protons from water itself (to make HF)

Answer:

11 atoms

Explanation:

The formula for lead(II) bicarbonate is: Pb(HCO3)2.

Atoms in Pb(HCO3)2:

Pb=1, H=1×2, C=1×2, O=3×2

1+1×2+1×2+3×2

=1+2+2+6

=11 atoms

A molecule of Lead (II) bicarbonate, which is a binary compound, consists of 11 atoms in total: 1 lead atom, 2 hydrogen atoms, 2 carbon atoms, and 6 oxygen atoms.

The formula for lead (II) bicarbonate is Pb(HCO₃)₂. This indicates there is 1 atom of lead (Pb), 2 atoms of hydrogen (H), 2 atoms of carbon (C), and 6 atoms of oxygen (O). So, in total, there are 11 atoms in a molecule of lead (II) bicarbonate. This is a binary compound, an example of the broader category known as binary compounds, which are compounds composed of two elements.

In terms of the bicarbonate anion, it consists of 1 carbon atom, 1 hydrogen atom, and 3 oxygen atoms. It is a polyatomic ion that frequently combines with metal ions, forming a variety of essential compounds.

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Answer:

=242.47 g of HF

Explanation:

From the equation One mole of SiO₂ (Silicon (IV) Oxide) react with 4 moles of HF (Hydrogen fluoride).

This is because the reaction ratio is 1:4

The number of moles in182 grams of SiO₂ is:

Number of moles= Mass/RMM

RMM of SiO₂ is 60.08 g/mol

No. of moles=182g/60.08g/mol

=3.0293 moles.

The reaction ratio of SiO₂ to HF is 1:4

Thus the number of moles of HF required to react with  3.0293 moles of SiO₂ is:

(4×3.0293)/1= 12.1172 moles

The mass of 12.1172 moles of HF is.

12.1172 moles× RMM of HF

=12.1172 moles×20.01 g/mol

=242.47 g of HF

The mass of 1.6 mol of aluminum atom is 43.1712.

What is aluminum atom?

To learn more about aluminum refer to:

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Answer:

15.4 mol CO₂

Explanation:

5.12 mol C₃H₈ × (3 mol CO₂ / mol C₃H₈) ≈ 15.4 mol CO₂

Answer:

15.36 moles of carbon dioxide are produced when 5.12 mol of propane gas is burned in excess oxygen

Explanation:

The Balanced Chemical equation is :

[tex]C_3 H_8 (g) + 5O_2 (g) > 3CO_2 (g) + 4H_2 O(l)[/tex]

Mole ratio of [tex]C_3 H_8:CO_2[/tex] is 1 : 3

That is, 1 mole of propane gas produces 3 moles of carbon dioxide gas.

Using mole ratio we can solve this  

[tex]5.12mol C_3 H_8  \times \frac {(3mol CO_2)}{(1mol C_3 H_8 )}[/tex]

[tex]=15.36 mol CO_2[/tex] is produced.

(Answer)

Please note  :

To convert moles to mass, we multiply by molar mass  

To convert mass to moles, we divide by molar mass

Molar mass is the mass of 1 mole of the substance

For example molar mass of [tex]CO_2[/tex] is

[tex](12.0+2\times16)=44 g/mol[/tex]

(we just add the atomic mass of the atoms to get the molar mass of the substance)

Answer:

That's called a first-order reaction.

Explanation:

In kinematics, the order of a chemical reaction is the sum of the power of concentrations in is rate law.

For example, consider a reaction with the following rate law:

[tex]\text{Rate} = k\cdot [\mathrm{A}]^{a}\cdot [\mathrm{B}]^{b}[/tex],

where [tex][\mathrm{A}][/tex] and [tex][\mathrm{B}][/tex] are the concentrations of the two reactants, [tex]\mathrm{A}[/tex] and [tex]\mathrm{B}[/tex].

The order of this reaction will be equal to the sum of the powers of the concentrations in the rate law. For this sample reaction, the order is equal to [tex]a + b[/tex].

For the reaction in this question, the rate law will resemble the following:

[tex]\text{Rate} = k\cdot [\mathrm{A}][/tex].

Note that the power "[tex]1[/tex]" next to the concentration of [tex]\mathrm{A}[/tex] is omitted. The order of this reaction will be numerically equal to one.

However, by convention, the order of the reaction is named in ordinals. (That is: first, second, third, etc.) The reaction here is known as a first-order reaction.

(Reference: "The Rate Law", Physical & Theoretical Chemistry, Chemistry Libretexts; "Cardinal and Ordinal Numbers Chart", Math Is Fun)

Answer:electrons will be equally attracted to both

Explanation:

e2020

Answer:

Electrons will be equally attracted to both atoms.

Explanation:

Answer:

A covalent bond will hold them together.

Explanation:

The two bromine atoms will share electrons to build a stronger bond and have a full valence outer shell (which makes them stable).

Hope this helps!

Answer:

c

Explanation:

did  on edge 2k24

The correct answer is D. 1.13 x 10^22 atoms are present in 0.378 g of neon. Avogadro's number (6.022 x 10^23) gives the ratio of representative particles per mole of substance. For every mole of substance, there are 6.022 x 10^23 representative particles present. Since 0.378 g of neon is less than one mole of neon, the answer should be less than Avogadro's number, which makes option D a logical answer.

Further Explanation:

To get the number of atoms present in 0.378 g of neon the following steps must be done:

STEP 1: Convert 0.378 g of Neon to moles of Neon

[tex]moles \ of \ neon \ = 0.378 \ g \ Ne (\frac{1 \ mol \ Ne}{20.1797 \ g \ Ne})\\\\\boxed {moles \ of \ Ne \ = 0.018732 \ mol}[/tex]

STEP 2: Use Avogadro's number to calculate the number of atoms of Ne

[tex]no. \ of \ atoms \ Ne \ = 0.018732 \ mol \ Ne \ (\frac{6.022 \ x \ 10^{23} \ Ne \ atoms}{1 \ mol \ Ne})\\\\ no. \ of \ atoms \ Ne \ = 1.128 \ x \ 10^{22} \ atoms[/tex]

Since the given, 0.378 g has 3 significant figures, the final answer must also have 3 significant figures. Therefore,

[tex]\boxed {no. \ of \ atoms \ Ne \ = 1.13 \ x \ 10^{22} \ atoms}[/tex]

A. 6.02 x 10^23 atoms is FALSE because the given amount of neon is less than one mole. Hence, the number of atoms cannot be equal to Avogadro's number.

B. 1.187 x 10^-2 atoms is FALSE because atoms are very very small particles. It will require a large number of atoms to make up something that is measurable like a 0.378 g sample of neon. Having less than 1 atom to make up this much sample is not logical.

C. 2.28 x 10^23 atoms is FALSE because this much atoms make up 0.3781 mol of Neon but the given is 0.378 grams not moles of Ne.

D. 1.13 x 10^22 atoms is TRUE because the value is less than 6.022 x 10^23 which is logical since the sample is less than 1 mole.

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Keywords: Avogadro's Number, Mole Conversion, Atoms

Final answer:

To find the number of atoms of neon in 0.378g, we divide the mass by the atomic mass of neon to find the number of moles, then multiply by Avogadro's number. The result is approximately 1.13 × 10²² atoms. So the correct answer is option d.

Explanation:

To determine how many atoms of neon are in 0.378g of neon, first, we need to use Avogadro's number, which is 6.022 × 10²³ atoms per mole. This number helps us to convert between the number of atoms and the number of moles. Neon has an atomic mass of approximately 20.18 g/mol. Therefore, we can calculate the number of moles of neon in 0.378g by using the formula:

moles of Neon = mass (g) / atomic mass (g/mol)

moles of Neon = 0.378g / 20.18g/mol

moles of Neon = 0.0187286 mol

Now, we convert this number into atoms using Avogadro's number:

number of atoms = moles of Neon × Avogadro's number

number of atoms = 0.0187286 mol × 6.022 × 10²³ atoms/mol

number of atoms ≈ 1.13 × 10²² atoms

So the answer is (d) 1.13 × 10²² atoms of neon in 0.378g of neon.

Answer:

whether their componets are made of elements or compounds

Explanation:

remeber homo means same and hetero mean different.

knowing this you also know that elements would be homogeneous and compounds would be heterogeneous since compunds are made of two or more things

Answer: Option (a) is the correct answer.

Explanation:

A mixture is defined as the substance that contains two or more different number of substances that are physically mixed together.

For example, a mixture of iron nails, sand and water.

A mixture in which solute particles are unevenly distributed into the solvent then it is known as a heterogeneous mixture.

For example, sand in water is a heterogeneous mixture.

A homogeneous mixture is defined as the mixture in which solute particles are evenly distributed in a solvent.

A homogeneous mixture is a clear solution.

For example, salt dissolved in water is a homogeneous mixture.

Thus, we can conclude that mixtures are classified as homogeneous and heterogeneous according to the distribution of their components.

Answer:

6.44 moles

Explanation:

At STP, 1 mole = 22.4 L

145 L × (1 mole ÷22.4 L) = 6.44 moles

Answer:

evaporation

faster

weeker

Liquid water changes to a gas through boiling; gas particles move faster and have weaker attractions than in the liquid state. This is due to higher kinetic energy overcoming hydrogen bond attractions. Water's unique properties, including ice being less dense than liquid water, are a result of hydrogen bonding.

When liquid water is heated, it will eventually change to a gas through boiling. Gas particles move faster and have weaker attractions between particles than liquid particles. The transition from the liquid phase to the gas phase happens at a substance's boiling point, which is a physical property of the liquid. The process whereby water transforms into gas is closely linked to the kinetic energy of its molecules and the breaking of hydrogen bonds. As water reaches its boiling point and is further heated, the water molecules gain enough energy to break free from the attraction that holds them together in the liquid state, allowing them to escape and spread out as a gas.

The unique properties of water, including its ability to exist as a gas, liquid, and solid, stem from its capacity to form hydrogen bonds. These bonds cause water to behave differently than other substances. For example, unlike most substances, ice (solid water) is less dense than liquid water because the hydrogen bonds cause the molecules to be structured in a way that takes up more space.

Final answer:

Dark matter and dark energy are termed 'dark' because they do not emit, absorb, or reflect light, which makes them invisible to traditional detection methods such as telescopes; they are detectable only through their gravitational effects.

Explanation:

Dark matter and dark energy are described as "dark" not because they emit blackbody radiation, absorb light, or are merely found in shadows, but because they are difficult to detect by conventional means. The correct answer is D. Because we cannot easily detect them. Dark matter does not emit, absorb, or reflect any light, making it invisible to traditional telescopes that detect electromagnetic radiation. Astronomers infer its existence through the gravitational effects it has on visible objects, such as the rotation curves of galaxies and the gravitational lensing of light from distant objects.

The term "dark" in dark matter and dark energy refers to the fact that these components do not interact with electromagnetic radiation in a way that allows us to detect them directly. Dark matter makes up approximately 80% of the matter in the Universe, and its presence is known primarily through its gravitational influence. Similarly, dark energy is hypothesized to be responsible for the observed acceleration of the expansion of the Universe. However, its nature remains a profound mystery in physics.

Answer:

B: Physical Science

Explanation:

The answer is physical science because you need to know the laws of physics and chemistry to know how a car works. Physical sciences = the sciences concerned with the study of inanimate natural objects, including physics, chemistry, astronomy, and related subjects.

Answer:

The correct answer would be CH2O,

Explanation:

Empirical Formula of any chemical compound gives us the information about the proportion of the element present in the compound but doesn't tell us about the actual numbers or arrangement of atoms.

C6H12O6 is the formula of Glucose. The empirical formula of Glucose is CH2O. This means that there is one atom of Carbon, 2 atoms of Hydrogen and 1 atom of oxygen is present. It tells us about the ratio of the atoms present in the molecules, like empirical formula of CH2O tells us that the ratio of carbon, hydrogen and oxygen is 1:2:1

Answer:

C. 2.4 M

Explanation:

Because you started with 12M solution of KCl, that means that there was a concentration of 12 mols of KCl per Liter of solution. (12mol/1L =12 M). Since there was only 0.5L of solution, there was only 6 mols of KCl because there is only 12 mols per 1 Liter, so half of that volume would have half the amount of solute to keep that true. (6mol/.5L = 12 M). With the new water added, the formula becomes (6mols KCl/ 2.5L of water =2.4 M)

After diluting 0.5 L of a 12 M potassium chloride (KCl) solution with 2 L of distilled water, the final concentration will be 2.4 M.So,option C is correct.

The final concentration of potassium chloride (KCl) after dilution, we can use the formula M1V1 = M2V2, where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.

Starting with 0.5 L of a 12 M KCl solution and adding 2 L of distilled water, the final volume (V2) is 0.5 L + 2 L = 2.5 L.

Using the formula, we get:

12 M times 0.5 L = M2 times 2.5 L

So, the final concentration (M2) is:

M2 = (12 M times 0.5 L) / 2.5 L = 2.4 M

Therefore, the final concentration of the KCl solution would be 2.4 M.

Answer:

Stirring the salt and water

Crushing the salt so the grains are smaller

Explanation:

Another way that is not in the choices that would increase the rate of dissolving of a solute in the solvent is heating the solvent.  This increases the kinetic energy of the particles hence increasing collision rates. This helps increase the dissolution of the solute.

Stirring helps break down the solute to smaller particles. Smaller particles have a larger surface area to volume ration on which collision with solvent molecule can occur hence faster dissolution.