What is the difference between practical work inside a laboratory and outside a laboratory

Since the reaction is 1:1, the limiting reactant is Zn and the excess reactant is S.

Mass in excess of S

So the answer is option b sulfur 0.407 g

From the calculations, the change in energy is - 190 J.

From the first law of thermodynamics, the energy is neither created nor destroyed but is transformed from one form to another.

From the law;

U = q + w

U = internal energy

q = heat

w = work

Since work is done on the surroundings and the gas absorbs heat then;

U = 132 J - 322 J

U = - 190 J

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The particle decay process described as 226 88 Ra → 222 Rn + He 86 involves the emission of a helium nucleus (He), which consists of two protons and two neutrons. This type of emission is known as alpha decay. Option A.

Alpha decay occurs when a radioactive nucleus releases an alpha particle, resulting in the emission of high-energy helium nuclei. In this case, the radium-226 (Ra) nucleus decays into radon-222 (Rn) by emitting an alpha particle. The resulting helium nucleus (He) is the emitted alpha particle.

Alpha particles have a positive charge and are relatively large and heavy. They are composed of two protons and two neutrons, which gives them a helium-like structure. Due to their size and charge, alpha particles have limited penetrating power and are typically stopped by a few centimeters of air or a sheet of paper.

Therefore, the correct answer A.  alpha radiation.

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Answer:The green elements on the table you are referring to are called Noble gases or Inert gases.

Explanation:

The green elements on the table you are referring to are called Noble gases or Inert gases. They each have two electrons in their outer shell, which gives them a full and stable electron configuration.

Answer:

1) mass of water increases. 2) freezing point of water decreases. 3) sunlight in deeper locations decreases.

Explanation:

Answer:

C

Explation:

I did the test on edge 2021

Answer: 8.0 moles

Explanation:

0.6661 moles×12 H≈8.0 moles

120 g of C₆H₁₂O₆ contain 8 moles of Hydrogen atoms

To obtain the answer to the question given above, we'll begin by calculating the mass of 1 mole of C₆H₁₂O₆

1 mole of C₆H₁₂O₆ = (12×6) + (12×1) + (16×6)

= 72 + 12 + 96

From the above,

We can see that 180 g of C₆H₁₂O₆ contains 12 moles of Hydrogen.

Finally, we shall determine the number of mole of Hydrogen atoms in 120 g of C₆H₁₂O₆. This can be obtained as follow:

180 g of C₆H₁₂O₆ contains 12 moles of Hydrogen.

Therefore,

120 g of C₆H₁₂O₆ will contain = \(\frac{120 * 12}{180}\) = 8 moles of Hydrogen.

Thus, 120 g of C₆H₁₂O₆ contain 8 moles of Hydrogen atoms

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Answer:

Al₂O₃ + 2 NaOH + 3 H₂O = 2 NaAl(OH)₄

Answer:

See explanation

Explanation:

The valence electrons are electrons found on the valence (outermost) shell of an atom.

When an atoms form compounds, there is an exchange of valence electrons between the atoms of one element and the atoms of another element.

Let us consider a typical example, sodium has one valence electron and chlorine has seven valence electrons. This means that chlorine needs one electron to complete its octet while sodium needs to release one electron in order to attain the octet structure.

So, sodium gives out its one electron and becomes a stable sodium ion and chlorine accepts that electron and becomes a stable chloride ion. This is how the compound sodium chloride is formed.

Answer:

Although it is possible to have more than one state, it is also possible to have only one state.

Explanation:

The mistake Dominic made was stating that "although it is possible to have more than one state, it is also possible to have only one state."

Mixtures are impure substances with the following properties:

They have an indefinite composition

Their constituents retains their identities.

Constituents react differently to changed conditions.

They can easily be separated into constituents by physical methods.

There are two types of mixtures based on the number of phases coexisting:

Homogeneous mixtures have their constituents existing in just one phase.

Heterogeneous mixtures exists in at least two different phases.

Explanation:

The statement which best describes the impacts that building dams can have on wildlife and the environment include the following: C) When a dam is built on a river, it increases the available water, allowing people to irrigate crops and raise livestock, and it allows the inhabitants of the river to move freely along the length of the river.

A river can be defined as a large natural body of fresh water that continuously flow into an ocean, lake, sea or another river. Additionally, some examples of a river include the following:

Generally speaking, a dam can be built on a river in order to increase the availability of water, which then allows people to irrigate their crops and raise livestock, without affecting the free movement of the living organisms living in the river.

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The rate of the given reaction is 0.00197 M/s.

The balanced chemical equation of the reaction is:

CO (g) + NO₂ (g) → CO₂ (g) + NO (g)

From the equation, 1 mole of CO produces 1 mole of CO₂, and hence the number of moles of CO2 produced is equal to the number of moles of CO consumed.

The concentration of CO₂ produced = 0.123 M.

Therefore, the concentration of CO consumed is also 0.123 M.

The rate of reaction is given by the formula:

where Δ[C] is the change in concentration and Δt is the change in time.

Over 62.3 seconds, the concentration of CO decreases from 0 M to 0.123 M.

Δ[C] = 0.123 M - 0 M

Δ[C]  = 0.123 M

Δt = 62.3 s

Substituting the values in the formula, we get:

rate of the reaction = Δ[C]/Δt

rate of the reaction = 0.123 M/62.3 s

rate of the reaction = 0.00197 M/s

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Answer:

3.011x10^24 molecules

Explanation:

1 mole=6.022x10^23 molecules

5 moles*6.022x10^23 molecules/mole=3.011x10^24 molecules

Answer:

The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge.

The following molecule represents a polysaccharide

For the majority of living things, carbohydrates represent a significant source of food and a key source of energy. A biomolecule called a carbohydrate is made up of the atoms of carbon, hydrogen, and oxygen. Aldehydes and ketones are the two fundamental chemical elements that make up carbohydrates. Both processed and natural meals include carbohydrates. three different forms of carbohydrates

Important classes of biomolecules include polysaccharides. They are lengthy chains of monosaccharide molecules that make up carbohydrates. These intricate biomacromolecules serve as a crucial energy source for animal cells and as a structural element of plant cells. Depending on the kind of the monosaccharides, it can either be a homo polysaccharide or a hetero polysaccharide.

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The oxidation number of Ag in Ag2O is +1.

In Ag2O, there are two silver atoms (Ag) and one oxygen atom (O). Oxygen is known to have an oxidation number of -2 in most compounds. Since the compound is neutral, the sum of the oxidation numbers of all the atoms must equal zero.

Therefore, the oxidation numbers of the two silver atoms must add up to +2 to balance out the -2 oxidation number of the oxygen atom. Since there are two silver atoms, each silver atom must have an oxidation number of +1 to yield a total oxidation number of +2 for the compound.

In Ag2O, the silver atoms lose one electron each to form Ag+ ions. This results in an oxidation number of +1 for each silver atom. The oxygen atom gains two electrons from the silver atoms to achieve a stable octet configuration, resulting in an oxidation number of -2 for the oxygen atom. The compound Ag2O is formed through the transfer of electrons, with each silver atom exhibiting an oxidation number of +1.

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Answer:

73.05g

Explanation:

1.25 mol NaCl * \(\frac{58.44g}{1 mol NaCl}\) = 73.05g

58.44g = molar mass of NaCl

Answer:  96 g O2

Explanation:

this is combustion

CH4 + 2 O2  --> CO2 + 2 H2O

24 g CH4  X 1 mole Ch4 / 16.043 g CH4) X ( 2 moles O2 / 1 moles CH4) X

( 31.999 G O2 / 1 mole O2 ) = 95.74 g O2 = 96 g O2 in correct sig figs

Answer: The Sun is so hot that it radiates most of its light in visible wavelengths, and these photons heat the Earth including the people on it. The photons that aren't reflected are absorbed. The absorbed photons transfer their energy to the skin, increasing its temperature, and again, we feel the sensation of heat.

Explanation:

Answer: 33.2 micrograms

Explanation:

We are going to convert grams to micrograms.

Step 1

Determine the conversion factors to use for converting grams to micrograms.

1 gram = 1000 milligrams

1 milligram = 1000 micrograms

Step 2

Use the number in the problem and the conversion factors to set up the problem so all conversion factors cancel except micrograms.

3.32 x 10⁻⁵ grams x (1000 milligrams/1 gram) x (1000 micrograms/1 milligram) = 33.2 micrograms/1 = 33.2 micrograms

Note that grams and milligrams cancel and you are left with micrograms. The given quantity 3.32 x 10⁻⁵ grams has 3 significant figures, so the final answer should have 3 significant figures too.

Answer:

76 Pounds = 34,473,020 Grams

Answer:

76 Pounds = 34,473,020 Grams

Explanation:

becuase one pound weighs 453.592 grams so i just added up

Answer:

yes because it has a fixed shape and volume

hope this helps

have a good day :)

Explanation:

Answer:

9.solar system

10.comet

11.gravity

12.earth and saturn

The bond between hydrogen and fluorine is covalent because their electronegative difference is less than 1.7

In addition, a hydrogen bond occurs when a small, highly electronegative X atom (essentially fluorine, oxygen, or nitrogen) is covalently bonded to a hydrogen atom.

Therefore the answer will be H-bonding

Answer:

cool

Explanation:

the enthalpy of reaction for HCl(g) + NaNO₂(s) → HNO₂(l) + NaCl(s) 2NaCl(s) + H₂O(l) → 2HCl(g) + Na₂O(s) ∆H° = -507.1 kJ/mol NO(g) + NO₂(g) + Na₂O(s) → 2NaNO₂(s) ∆H° = -427.0 kJ/mol NO(g) + NO₂(g) → N₂O(g) + O₂(g) ∆H° = -43.01 kJ/mol 2HNO₂(l) → N₂O(g) + O₂(g) + H₂O(l) ∆H° = +34.02 kJ/mol the enthalpy of reaction for the given reaction is -39.1 kJ/mol.

We can use the given reactions and their enthalpies to find the enthalpy of reaction for the given equation.

The given equation is:

HCl(g) + NaNO₂(s) → HNO₂(l) + NaCl(s)

We can break down this reaction into several steps using the given reactions as follows:

Na₂O(s) + 2HCl(g) → 2NaCl(s) + H₂O(l) (reverse of the given reaction)

∆H° = +507.1 kJ/mol (reverse the sign of given reaction)

2NaCl(s) + H₂O(l) → Na₂O(s) + 2HCl(g)

∆H° = -507.1 kJ/mol (given reaction)

NO(g) + NO₂(g) + Na₂O(s) → 2NaNO₂(s)

∆H° = -427.0 kJ/mol (given reaction)

2HNO₂(l) → N₂O(g) + O₂(g) + H₂O(l)

∆H° = +34.02 kJ/mol (given reaction)

NO(g) + NO₂(g) → N₂O(g) + O₂(g)

∆H° = -43.01 kJ/mol (given reaction)

Now, we can add these equations and their enthalpies to get the overall enthalpy of the given reaction:

HCl(g) + NaNO₂(s) → HNO₂(l) + NaCl(s)

H₂O(l) + 2NaCl(s) → Na₂O(s) + 2HCl(g) ∆H° = -507.1 kJ/mol

Na₂O(s) + NO(g) + NO₂(g) → 2NaNO₂(s) ∆H° = -427.0 kJ/mol

2HNO₂(l) → N₂O(g) + O₂(g) + H₂O(l) ∆H° = +34.02 kJ/mol

NO(g) + NO₂(g) → N₂O(g) + O₂(g) ∆H° = -43.01 kJ/mol

HCl(g) + NaNO₂(s) → HNO₂(l) + NaCl(s) ∆H° = -39.1 kJ/mol

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The mole fraction of KCl would be 0.10.

The molality of the KCl would be 5.96 mol/kg

1.

The number of moles of KCl :

n(KCl) = 140.0 g / 74.55 g/mol = 1.878 mol

The number of moles of water:

n(H2O) = 315 g / 18.015 g/mol = 17.49 mol

The total number of moles in the solution:

n(total) = n(KCl) + n(H2O) = 1.878 mol + 17.49 mol = 19.37 mol

The mole fraction of KCl can then be calculated as the ratio of the number of moles of KCl to the total number of moles:

X(KCl) = n(KCl) / n(total) = 1.878 mol / 19.37 mol = 0.10

2.

The number of moles of KCl : n(KCl) = 140.0 g / 74.55 g/mol = 1.878 mol

The mass of water: m(H2O) = 315 g / 1000 = 0.315 kg

molality = n(KCl) / m(H2O) = 1.878 mol / 0.315 kg = 5.96 mol/kg

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