What is always true of scientific investigations? A. They lead to conclusions that become scientific laws. B. They provide evidence that proves a hypothesis. C. They include a hypothesis that can be shown to be wrong. D. They result in the development of new technologies.​

The ratio of Boyle's temperature and critical temperature is 278. both a and b are present in Boyle's temperature.

Boyle temperature can be defined as the point in the temperature range in which a real gas starts to behave like an ideal gas at a pressure range.

The temperature at which the second coefficient in the expression becomes zero is also known as a Boyle temperature.

In Boyle's Temperature , TB=aRb.

Critical Temperature , TC=8a27Rb.

a and b are van der Waal's constants. R is molar gas constant. The Ratio of both temperatures

= TB/TC = aRb/8a27Rb

Both the critical temperature and boyles temperature have the Vander Waal's constant 'a' and 'b'.

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One oxygen atom shares two electron with two hydrogen atoms in this way water molecules are formed. The bond between oxygen and hydrogen is covalent bond.

An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs.

Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.

According to the amount of shared electron pairs, there are three different forms of covalent bonds. single covalent bond is one type of covalent bond. covalent double bond and covalent triple bond.

Thus, option B is correct .

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The answer is: To demonstrate that the liquid is a mixture, the scientist can perform the chromatography.

Mixture: They are formed when two elements or compounds are combined physically and not chemically.

What are the types of mixtures?

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Answer:

Yes it is true

Explanation:

This is because the Clausius theorem states that The cyclic integral always has two defined results. The results include it being less than or equal to zero under certain conditions.

When the system consists of only reversible processes, the cyclic integral is equal to zero. If it consists of and irreversible processes, the integral is usually less than zero.

1.) Chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution. 2.)  You will need to use 0.12 L of 1.50 M solution to make 2.40 L of 0.0750 M solution. 3.) Solution has a molality of 0.00229 mol/kg.

Molality is defined as a measure of number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent.

1.) As, mass = moles x molar mass

Molar mass of KMnO4 is 158.03 g/mol

So, mass = 0.50 mol x 158.03 g/mol = 79.02 g

Therefore, the chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution.

2.)As , C1V1 = C2V2

Here C1 is initial concentration, V1 is initial volume, C2 is final concentration and V2 is the final volume.

1.50 M x V1 = 0.0750 M x 2.40 L

Now, V1 = (0.0750 M x 2.40 L) / 1.50 M

So, V1 = 0.12 L

You will need to use 0.12 L of the 1.50 M solution to make 2.40 L of the 0.0750 M solution.

3.) Formula for molality is: m = (moles of solute) / (kg of solvent)

As, moles = (mass of solute) / (molar mass of solute)

= (20 g) / (58.44 g/mol) = 0.344 mol

m = (0.344 mol) / (150 g / 1000 g/kg) = 0.00229 mol/kg

So, the solution has a molality of 0.00229 mol/kg.

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Based on the reactivity of the metals:

The ability of metals to displace hydrogen from dilute acids depends on the reactivity of the metal.

Reactive metals such as zinc and magnesium which occur higher than hydrogen in the activity series of metals will displace hydrogen from dilute acids such as dilute hydrochloric acid.

Copper cannot displace hydrogen from acids because it is less reactive than hydrogen.

The rate of reaction increases with increase in concentration of the acid.

Therefore, no reaction occurs for the copper strips in test tubes 3 and 6.

Hydrogen is displaced by the magnesium strips in test tubes 1 and 4, with the reaction more vigorous in the acid of higher concentration.

Hydrogen is displaced by the zinc strips in test tubes 2 and 5, with the reaction more vigorous in the acid of higher concentration.

In conclusion, reactive metals such as magnesium and zinc displace hydrogen from acids while a less reactive metal such as copper do not.

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Answer:

Cost.  

Weapons Proliferation Risk.  

Meltdown Risk.  

Mining Lung Cancer Risk.

Explanation:

Hope this helped!!!

Answer:

temperature and mass

Explanation:

porque

Answer:

  -172.6 °C

Explanation:

You want to know the Celsius equivalent of the temperature 100.6 K.

The relation is ...

  C = K - 273.15

  C = 100.6 -273.15 = -172.55

The temperature is -172.55 °C, about -172.6 °C.

__

Additional comment

We have rounded to tenths, because that is precision of the temperature given. If you use 273 as the conversion constant, you will get -172.4.

The molar mass is 176.1 g/mol , and Ka for vitamin C is  1.03 x 10⁻⁴

The equation for the reaction is as shown in the attached diagram below

the reaction of Sodium Hydroxide, NaOH with ascorbic acid, C₆H₈O₆ is similar to the reaction of Potassium Hydroxide, KOH with ascorbic acid as show

C₆H₈O₆  +  KOH     ⇒     C₆H₇O₅K    +   H₂O

to produce one mole of potassium ascorbate and water

now,

0.1103 M KOH is contained in 1000mL

x moles is contained in 20mL

cross multiply making x the subject

No of moles of KOH = (0.1103 x 28.42)/1000 = 0.003135 moles

or

Moles of KOH = 0.1103 x 0.02842 L = 0.003135  = moles ascorbic acid

Molar mass = 0.552 g / 0.003135 mol = 176.1 g/mol

Moles of ascorbic acid = 0.552 / 176.1 =0.00313

moles NaOH = 0.0100 L x 0.1103 =0.001103

C₆H₈O₆ + OH⁻ >> C₆H₇O₆⁻ + H2O

Moles ascorbic acid in excess = 0.00313 - 0.001103 = 0.002027

Moles C₆H₇O₆⁻ = 0.001103

total volume = 20 + 10 = 30 mL = 0.030 L

concentration ascorbic acid = 0.002027 / 0.030 =0.0676 M

concentration C₆H₇O₆⁻ = 0.001103 / 0.030 =0.0368 M

pH = pKa + log [C₆H₇O₆⁻] / [C₆H₈O₆]

3.72 = pKa + log 0.0368 / 0.0676

3.72 = pKa - 0.264

pKa =3.984

Ka = 10^-3.984

=1.03 x 10⁻⁴

Your question is incomplete most probably your full question was

A 0.552-g sample of ascorbic acid was dissolved in water to a total volume of 0.20 mL and titrated with 0.1103 M KOH. The equivalence point occurred at 28.42 mL. The pH of the solution at 10.0mL of added base was 3.72. From this data, determine the molar rmass and Ka for vitamin C.

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0.66 moles of aluminum are needed to react completely with 2 moles of FeO.

Given,

the chemical equation is,

Al(s)+3FeO(s)—>3Fe(s)+Al2O3(s)

1 mole of aluminum is needed to react completely with 3 moles of FeO.

then,

no of moles of aluminum are needed to react completely with 2 moles of FeO = 2/3 = 0.66 moles

Hence, 0.66 moles of aluminum are needed to react completely with 2 moles of FeO.

A chemical element with the symbol Al and atomic number 13 is known as aluminium (or aluminium in American and Canadian English). Aluminum has a density that is around one third that of steel, which is lower than that of most common metals. It has a strong affinity for oxygen, and when exposed to air, creates a protective oxide coating on the surface. Aluminum visually resembles silver due to similarities in colour and light-reflecting properties. It is ductile, soft, and non-magnetic. Aluminum is the twelfth most prevalent element in the universe based on the frequency of its one stable isotope, 27Al, which is also the only stable isotope. Radiodating makes use of 26Al's radioactivity. A chemical element with the symbol Al and atomic number 18 is called aluminium (aluminium in American and Canadian English).

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The mass (in grams) of chlorine gas is needed to react with 251 grams of iron is 479 grams. Option C.

To determine the mass of chlorine gas needed to react with 251 grams of iron, we need to use the stoichiometry of the balanced chemical equation:

2Fe + 3Cl2 → 2FeCl3

From the balanced equation, we can see that 2 moles of iron (Fe) react with 3 moles of chlorine gas (Cl2) to produce 2 moles of iron(III) chloride (FeCl3).

To calculate the mass of chlorine gas, we can follow these steps:

Step 1: Convert the given mass of iron (Fe) to moles.

Using the molar mass of iron (Fe), which is approximately 55.85 g/mol, we can calculate the number of moles of iron:

moles of Fe = mass of Fe / molar mass of Fe

moles of Fe = 251 g / 55.85 g/mol

moles of Fe ≈ 4.5 mol (rounded to one decimal place)

Step 2: Use the mole ratio from the balanced equation to find the moles of chlorine gas (Cl2) needed.

From the balanced equation, we know that 2 moles of Fe react with 3 moles of Cl2. Therefore, the moles of Cl2 can be calculated as:

moles of Cl2 = (moles of Fe / 2) * 3

moles of Cl2 = (4.5 mol / 2) * 3

moles of Cl2 ≈ 6.75 mol (rounded to two decimal places)

Step 3: Convert the moles of chlorine gas to grams.

Using the molar mass of chlorine gas (Cl2), which is approximately 70.90 g/mol, we can calculate the mass of chlorine gas:

mass of Cl2 = moles of Cl2 * molar mass of Cl2

mass of Cl2 = 6.75 mol * 70.90 g/mol

mass of Cl2 ≈ 479 grams (rounded to the nearest whole number) Option C is correct.

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Answer:

5.13x10>-2

Explanation:

Answer:Condensation

Evaporation

melting

ionization

Explanation:

Hope this helps :)

From a gas to a liquid: This is called condensation ; From a liquid to a gas: This is called evaporation or vaporization ; From a solid to a liquid: This is called melting ; From a gas to a plasma: This is called ionization.

Process by which water vapor in air is changed into liquid water is called condensation.

From a gas to a liquid: This is called condensation. It occurs when gas loses heat energy and particles start to slow down and move closer together, eventually forming liquid.

From liquid to a gas: This is called evaporation or vaporization. It occurs when liquid gains enough energy to break the intermolecular forces between the particles, causing them to become gas.

From a solid to liquid: This is called melting. It occurs when solid absorbs enough energy to overcome the intermolecular forces holding its particles together, causing particles to move more rapidly and become liquid.

From a gas to a plasma: This is called ionization. It occurs when gas is subjected to strong electric field, heat, or radiation and some or all of atoms or molecules lose their electrons, creating positively charged ions and negatively charged electrons. This mixture of charged particles is called plasma.

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Answer:

HClO₃

Explanation:

Empirical formula of a chemical compound is defined as the simplest ratio of atoms presents in the compound (In whole numbers).

For the H₂Cl₂O₆ the empirical formula could be obtained dividing in 2 the formula. That is:

HClO₃ → This is the simplest ratio of atoms presents in the compound, that is, the empirical formula

Answer:

20 neutrons

Explanation:

(not really any just look at a periodic table)

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

Explanation:

\(57816 \: moles\)

are present in 4.20x10^24 atoms of Pb

Answer:

7 moles

Explanation:

(4.2*10^24)/(6*10^23)=7

Answer

The Lewis structure of SO2 (stable form) is shown below;

The unstable form SO2 Lewis structure is also shown below:

To pevent gasoline leaks, regular maintenance checks and replacement of damaged underground tanks is required.

Gasoline leaks occurs when tanks are rusty and corroded or where there are loose fitting of pipes and connection points.

Gasoline leak presents a serious environmental hazard as well as threat to life and properties.

Gasoline leaks can cause fire outbreaks which would destroy properties and endanger lives.

Gasoline leaks can also cause land and water pollution killing important aquatic and soil organisms.

Therefore, regular maintenance checks and replacement of damaged underground tanks will prevent gasoline leaks.

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Answer:

To pevent gasoline leaks, regular maintenance checks and replacement of damaged underground tanks is required.

What causes gasoline leak?

Gasoline leaks occurs when tanks are rusty and corroded or where there are loose fitting of pipes and connection points.

Gasoline leak presents a serious environmental hazard as well as threat to life and properties.

Gasoline leaks can cause fire outbreaks which would destroy properties and endanger lives.

Gasoline leaks can also cause land and water pollution killing important aquatic and soil organisms.

Therefore, regular maintenance checks and replacement of damaged underground tanks will prevent gasoline leaks.

Explanation:

Give the person who answered this question for real brainliest, they deserve it :D

(P1V1=nRT1)/(P2V2=nRT2)

Constant temperature → (P1V1)/(P2V2)

688 mm Hg → 0.905 atm

994 mm Hg → 1.30789 atm

500.2 mL → 0.5002 L

(P1V1)/(P2V2)

(0.905)V1/(1.30789)(0.5002)

V1 = 0.72288 L → 722.88 mL

Answer:

E

Explanation:

The simple rule of thumb is that as the atomic or molar mass of an atom increases, the entropy increases. This means that more the mass more will be entropy.

The atomic mass of various elements is as follows

Ne = 20 g/mol

Xe = 131 g/mol

He = 4 g/mol

Ar = 40 g/mol

Kr = 84 g/mol

Therefore, the order of increasing entropy must be

He<Ne<Ar<Kr<Xe.

Hence, option E is the correct answer.

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.

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The transition that involves the greatest change in energy is the transition shown by (f)

When an electron moves from one energy level to another, this is referred to as an energy transition in an atom. An atom's electrons can be found in various orbitals or energy levels, and because these levels are quantized, only specific values are permitted.

The transition in f involves a movement from n = 1 to n =4 that shows a great involvement of energy for such to occur.

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Answer:

\(8.876\times 10^{18}\ km^2\)

Explanation:

In this problem, we need to convert \(8.876 \times 10^{12}\ m^2\) to km².

We know that,

1 km = 1000 m

⇒ 1 km² = 10⁶ m²

So,

\(8.876 \times 10^{12}\ m^2=8.876 \times 10^{12}\times 10^6\ km^2\\\\=8.876\times 10^{18}\ km^2\)

So, \(8.876 \times 10^{12}\ m^2\) is equal to \(8.876\times 10^{18}\ km^2\).

Answer:

\(HCN~~Ka=4.9x10^-^1^0\)

Explanation:

In this case, we have to remember the relationship between the Ka value and the pH. We can use the general reaction for any acid with his Ka value expression:

\(HA~->~H^+~+~A^-\)    \(Ka=\frac{[H^+][A^-]}{[HA]}\)

In the Ka expression, we have a proportional relationship between Ka and the concentration of \(H^+\). Therefore, if we have a higher Ka value we will have a smaller pH (lets keep in mind that with a higher

So, if we have to find the higher pH value we need to search the smaller Ka value in this case \(HCN~~Ka=4.9x10^-^1^0\).

I hope helps!

HCN has the highest pH among all the acids listed in the question.

The Ka is called the acid dissociation constant. It shows the extent to which an acid is ionized in water. The pH shows the hydrogen ion concentration of water. The higher the Ka, the higher the hydrogen ion concentration and the lower the pH.

Hence, HCN has the lowest Ka and the lowest hydrogen ion concentration. Therefore, HCN has the highest pH among all the acids listed in the question.

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Answer:

A

Explanation:

Reactants are on the right side of the chemical reaction