Which of these gaseous elements is LEAST reactive?

a. hydrogen

b.helium

c.nitrogen

d.oxygen

There are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

To determine the number of water molecules in the given volume of water, we need to use the relationship between mass, volume, and molar mass of water.

First, we need to find the mass of water in the bottle:

Mass = Density * Volume

Mass = 0.967 g/mL * 499.8 mL = 483.9 g

Next, we need to convert the mass of water to moles using the molar mass of water. The molar mass of water (H2O) is approximately 18.015 g/mol.

Moles = Mass / Molar mass

Moles = 483.9 g / 18.015 g/mol = 26.88 mol

Finally, we can calculate the number of water molecules using Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules = Moles * Avogadro's number

Number of molecules = 26.88 mol * (6.022 x 10^23 molecules/mol) = 1.62 x 10^25 molecules

Therefore, there are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

for more questions on molecules
https://brainly.com/question/24191825
#SPJ8

Answer:

the l sign means the substance in the chemical equation is a liquid. (hope this helped : D )

For the above compounds, the order of increasing lattice energy is MgO, NaCl, CsI, and AlN.

Because the ionic species in MgO have greater charge (Mg+2 and O2- as opposed to Na+ and Cl-), the ionic bond is stronger than it is in NaCl. As a result, MgO has greater ionic connections than NaCl. MgO is hence more ionic than NaCl.

The size of the ions involved has an inverse relationship with lattice energy in ionic compounds. MgO has the highest lattice energy because Mg2+, the smallest of the four ions (because anion is the same in all), is present.

To know more about lattice energy visit:-

https://brainly.com/question/18222315

#SPJ1

The equation  in the question is: H+H → H + H Complete the equation by filling in the missing parts. missing part is  1 → H+H-2 → →3 → He.

The atomic number of hydrogen is 1, which means it has only one proton in the nucleus and one electron in its shell. Two hydrogen atoms react with each other to form helium. Helium has 2 protons and 2 neutrons in its nucleus and two electrons in its shell. Therefore, the equation is:

H + H → HeIt can be seen that:1. H + H (Reactants)

2. → (Yields or Reacts to form)

3. He (Product)Therefore, the tiles will be arranged as shown below: 1 → H+H-2 → →3 → He

For more question atomic number

https://brainly.com/question/16858932

#SPJ8

The mass of water produced by the reaction of the 23 g of \(SiO_2\)  is 13.8 g.

The given chemical reaction;

\(4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)\)

In the given compound above, we can deduce the following;

60 g of \(SiO_2\)  --------- 36 g of water

23 g of \(SiO_2\)  ------------- ? of water

\(mass \ of \ water = \frac{23 \times 36}{60} = 13.8 \ g \ of \ water\)

Thus, the mass of water produced by the reaction of the 23 g of \(SiO_2\)  is 13.8 g.

In the reaction of the given compound, \(4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)\), what mass of water (in grams) is produced by the reaction of 23.0 g of SiO2?

Learn more here:https://brainly.com/question/13644576

Answer:

............................................................................................................................

Explanation:

because ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Answer:

protein, carbs, and fats.

Explanation:

Those are the three main sources of macronutrients.

(this isn't a chemistry, it's health)

Answer:

fats, carbohydrates and proteins

Explanation:

I don't know, I answered that on my test and it was correct

Answer:

I believe it is a physical change

Explanation:

The telltale sign of a chemical change is the formation of a new substance. They also usually involve the production of energy (heat, light, sound etc.)

Answer:12668 J.

Explanation:

First of all, steam is there so in order to convert it into water it must have to release latent heat of vaporization which is equal to approximately 2450 kJ/kg or 2450 J/g.

So, the calculation is given below.

Heat released during conversion of steam at 100°C to water at 100°C= m*L

= 5*2450= 12250 J.

Heat released during conversion of water at 100°C to water at 80°C= m*Cp*(∆T)

= 5*4.18*20= 418 J.

So total heat released= 12668 J.

hope this helps:)!!!

The heat energy released or absorbed by a system can be calculated using calorimetric equation. The heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33858 J or 338 KJ.

Calorimetry is an analytical tool used to determine the heat energy q absorbed or released in a reaction system. The calorimetric equation connecting mass of the reactant m, specific heat capacity c and temperature difference ΔT is related by the expression:

q = mcΔT.

The mass of steam is given 60 g and temperature difference is from 235 to 100 °C thus 135 °C and the specific heat capacity of  water or steam is 4.18 J/°C. The heat energy released is calculated as follows:

q = 60 g × 4.18 J/°C × 135 °C

  = 33858 J

Hence, heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33585 J.

To refer more on calorimetry, refer the link:

https://brainly.com/question/11477213

#SPJ2

The dissociation equation for lithium hydroxide (LiOH), a strong base, is: LiOH (s) → Li+ (aq) + OH- (aq) A dissociation equation is an equation that represents the dissociation of a compound into its ions when dissolved in a solvent.

In this case, LiOH dissociates in water to form Li+ and OH- ions. LiOH is a strong base because it dissociates almost completely in water, producing a high concentration of OH- ions. The dissociation of a strong base is represented by a one-way arrow in the equation, indicating that it proceeds almost completely in one direction.A two-way arrow, <--> , is used in equilibrium reactions, where the forward and reverse reactions occur at the same rate. This is not the case for the dissociation of strong bases like LiOH, where the reaction proceeds almost completely in one direction.

For more such questions on dissociation

https://brainly.com/question/29012577

#SPJ11

Answer: A) H-H is least polar

Explanation:

Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself. The more is the difference in electronegativity, the more polat the bond is.

1. H-H : Electronegativity difference = electronegativity of hydrogen - electronegativity of hydrogen =2.1 -2.1= 0

2.   H-Cl : Electronegativity difference = electronegativity of chlorine - electronegativity of hydrogen = 3-2.1 = 0.9

3. H-F : Electronegativity difference  = electronegativity of fluorine - electronegativity of hydrogen= 4-2.1= 1.9  

4.   H-I : Electronegativity difference = electronegativity of iodine - electronegativity of hydrogen= 2.5 -2.1= 0.4

Thus the least electronegativity difference between the bonded atoms is in H-H , this is least polar.

Answer:

D

Explanation:

The rest have characteristics of a plant cell

Explanation:

The degree of amines is determined by the number of carbons attached to the nitrogen.

According to the given picture, the answer is A.

Answer:

The answer is A.

The number of nitrogen atoms in a container of volume 0.50 dm³ at 0 °C. The pressure of the gas is 101 Pa. is  approximately 1.47 x 10^19 nitrogen atoms in the given container.

PV = nRT

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

0.50 dm³ = 0.50 x \(10^-^3\) m³

0 °C = 273 K

n = PV/RT

n = (101 Pa)(0.50 x \(10^-^3\) m³) / [(8.31 J/mol K)(273 K)]

n = 0.0000244 mol

n = (0.0000244 mol)(6.02 x \(10^2^3\)atoms/mol)

n = 1.47 x \(10^1^9\) nitrogen atoms

Learn more about the pressure, gas here.

https://brainly.com/question/31463642

#SPJ1

Answer:

1. The combined number of protons and neutrons remains constant.

2. There are two atoms with mass numbers of 2.

3. It is the number of protons plus neutrons.

4. A nucleus with a greater mass than any of the reactants will be produced.

5. Fusion reactions in the sun convert small amounts of matter into large amounts of energy.

Answer:

Br-Ag-Br

Explanation:

Explanation:

# grams Sulfuric Acid formed from 22.3 g Sulfur Dioxide

\(23.2 \: g \: SO₂ \times \frac{1 \: mol \: SO₂)}{64.07g \: SO₂} \times \frac{1 \: mol \: H₂SO₃}{1 \: mol \: SO₂)} \times \frac{82.09 \: g \: H₂SO₃}{1 \: mol \:SO₂ } = 28.6 \: g \: H₂SO₃\)

# grams Sulfuric Acid formed from 5.42 g Water

\(5.42 \: g \: SO₂ \frac{1 \: mol \: H₂O)}{18.02g \: H₂O} \times \frac{1 \: mol \: H₂SO₃}{1 \: mol \: H₂O)} \times \frac{82.09 \: g \: H₂SO₃}{1 \: mol \:H₂SO₃ } = 24.7 \: g \: H₂SO₃\)

# Sulfur Dioxide used by reaction 5.42 g Water

\(5.42 \: g \: H₂O \times \frac{1 \: mol \: H₂O)}{18.02g \: H₂O} \times \frac{1 \: mol \: SO₂}{1 \: mol \: H₂O)} \times \frac{64.07 \: g \: SO₂}{1 \: mol \:SO₂ } = 19.27 \: g \: SO₂\)

# of SO₂ in Excess

\( 23.2 \: g \: SO₂ - 19.27 \: g \: SO₂ = 3.0 \: g \: SO₂\)

answer

.03886 grams or 3.886 x 10^‐2 grams

steps

avogadros number

6.022×10²³ atoms of ANY ELEMENT = 1 mole

whats different for every element is the number of GRAMS or MASS

1 mole of iron is 55.847 grams

2.34 x 10²² ÷ 6.022×10²³ =

.03886 grams or

3.886 x 10^‐2 grams

The formula for iron (II) sulfate hexahydrate

\(is\)

FeH12O10S

The reaction between cobalt (II) chloride and potassium hydroxide can be depicted as follows:

CoCl2(aq)+2KOH(aq)----> Ca(OH)2(s)+2KCl(aq)

A double displacement reaction is one that involves the exchange of ions and leads to the formation of new products. The products that are soluble in water are represented by the symbol (aq) and the ones that are insoluble in the water remain in the (s) or precipitate form along with the chemical formulas.

The double displacement reaction can be depicted as follows:

XY+AB--->AB+AY

The reaction between cobalt (II) chloride and potassium hydroxide can be depicted as follows:

CoCl2(aq)+2KOH(aq)----> Ca(OH)2(s)+2KCl(aq)

To learn more about double displacement reaction check the link below:

https://brainly.com/question/26413416

#SPJ4

The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.

The heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:

q = m x Hv

where:

First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:

moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol

Thus:

q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ

In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.

More on heat of vaporization can be found here: https://brainly.com/question/12625048

#SPJ1

Option B, where [OH-] is 1.0 x 10-13 mol dm-³3, is the only one that can be considered basic. Therefore, Option B is the correct answer.

To determine whether a solution is basic or acidic at 25 °C, we can compare the concentration of hydroxide ions ([OH-]) with the concentration of hydronium ions ([\(H_3O\)+]). In a neutral solution, the concentrations of [\(H_3O\)+] and [OH-] are equal, resulting in a pH of 7.

Option A states that the concentration of [\(H_3O\)+] is 1.0 x 10-3 mol dm-3. Since [\(H_3O\)+] represents the concentration of hydronium ions, this solution would be acidic because the concentration of [\(H_3O\)+] is higher than [OH-], indicating an excess of hydronium ions.

Option B states that the concentration of [OH-] is 1.0 x 10-13 mol dm-³3. In this case, [OH-] is higher than [\(H_3O\)+], indicating an excess of hydroxide ions. Therefore, this solution would be considered basic.

Option C states that the solution has a pH of 4.00. A pH of 4.00 is below the neutral pH of 7, indicating an excess of hydronium ions and an acidic solution. Therefore, this option does not represent a basic solution.

Option D states that the concentration of [\(H_3O\)+] is 1.0 x 10-13 mol dm-3. Similar to Option A, this concentration of [\(H_3O\)+] indicates an acidic solution, not a basic one.

Option B

For more such question on basic visit:

https://brainly.com/question/29886197

#SPJ8

Answer:

D is the correct answer

Explanation:

In order for a solution to be basic at 25 C, the H+ concentration has to be less than the OH- concentration, and given that H+ times OH- is 10^-14, we deduce that H+ must be less than 10^-7 for the solution to be acidic. Thus, A can be eliminated, and so can C. With B, we calculate an H+ concentration of 0.1M, which also fails to be less than 10^-7
Thus, D is the correct answer and we can verify that as H+ is less than 10^-7.



Note: I do not know why my previous answer was deleted for "being incorrect", and i'm not sure how the incorrect answer was "expert verified", but I am as certain that D is the correct answer as i am sure of 3*(4+5-1) being equal to 24.

At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

For more such questions on equilibrium, click on:

https://brainly.com/question/517289

#SPJ8

Explanation:

A nitrogen-containing compound that shows no absorption band at around 3400 cm^−1 and no absorption bands between approximately 1700 cm^−1 and 1600 cm^−1 is likely an amide compound.

Amides typically exhibit a characteristic absorption band in the region of 3200-3500 cm^−1 due to the N-H stretching vibration. The absence of this absorption band suggests the absence of N-H bonds, which rules out compounds like primary or secondary amines.

The absence of absorption bands between 1700 cm^−1 and 1600 cm^−1 eliminates functional groups such as carbonyl compounds (e.g., aldehydes, ketones, carboxylic acids, esters) and imines, which typically exhibit absorption in this region.

Therefore, based on the given information, it can be inferred that the compound is likely not an amine, carbonyl compound, or imine. Other classes of compounds that do not possess these characteristic absorption bands would need to be considered.

125mg of potassium nitrate is present in 0.250 kg of a 500 ppm aqueous solution of potassium nitrate, KN03(aq).

A solution is a uniform mixture of one or more dissolved solutes in a solvent. A solvent is a substance that dissolves a solute to produce a homogeneous mixture. The substance that dissolves in a solvent to form a homogeneous mixture is referred to as a solute.

A solution is formed when two chemicals, known as a solvent and a solute, are combined. A solution is formed when a solute and a solvent combine.

1. ppm = mass solute (mg) / mass solution (kg)

2. Re-arrange this equation to find the mass of solute:

mass solute (mg) = ppm x mass solution (kg)

3. Substitute in the values in equation as follows:

mass KNO3 = 500ppm x 0.25kg

= 125mg

Thus, 125mg of potassium nitrate is present in 0.250 kg of a 500 ppm aqueous solution of potassium nitrate, KN03(aq).

To learn more about the solution, follow the link;

https://brainly.com/question/7932885

#SPJ1

Answer:

Element

Explanation:

Iron is an element