if your sample contained a volatile impurity what value would be in error, the mass of the anhydrous salt or the mass of the water?

Answer:64.43g H2O

Explanation: the other one is wrong

To calculate the enthalpy of the given reaction, understanding of stoichiometry, bond energies and the concept of enthalpy changes in chemical reactions is utilized. The reaction has stoichiometric amounts of reactants, leads to formed stronger bonds in the products, and is exothermic.

To determine the enthalpy for the given reaction: Al(OH)3(s)+3HCl(g)→AlCl3(s)+3H2O(l), firstly, for the reaction of 0.0500 mol acid (HCl), we know that q = -2.9 kJ. Since the reactants are provided in stoichiometric amounts (the same molar ratio as in the balanced equation). The enthalpy change is proportional to the amount of acid neutralized: ΔH = -2.9 kJ/0.0500-mol HCl.

Use the standard molar enthalpy of formation of HCl(g), ΔH, of -92.307 kJ/mol. This excess energy is released as heat, indicating that this reaction is exothermic. The bond formation and breaking are a part of this process, creating H-Cl bonds which release more energy than they consume.

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For the given reaction, 1 mole of Al2S3 produces 3 moles of H2S. Therefore, 32 moles of Al2S3 can produce 96 moles of H2S. This is the theoretical yield of H2S for this reaction.

The balanced chemical equation given is Al2S3 + 6H2O → 2Al(OH)3 + 3H2S. From this equation, you can see that 1 mole of Al2S3 produces 3 moles of H2S. Therefore, if you have 32 moles of Al2S3, theoretically you can produce 3 x 32 = 96 moles of H2S. This is the theoretical yield of H2S for the given reaction, assuming that the reaction goes to completion with no side reactions.

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Understanding the structure of atoms reveals unity in the form of consistency of atomic properties within the same element and diversity in the unique structures and behaviors of atoms across different elements. This combination of unity and diversity is essential in explaining the wide range of properties and behaviors observed in different forms of matter.

Understanding the structure of an atom provides insight into both unity and diversity of matter. An atom, being the smallest component of an element retains all of the chemical properties of that element, illustrating unity because every atom of the same element is identical and exhibits the same properties. The structure of an atom consists of a nucleus, which is surrounded by electrons.

The nucleus contains protons and neutrons, and these substructures determine the characteristics of atoms including its interactions and stability.Dalton's atomic theory, with its principles of law of conservation of matter and indivisibility, further explains unity in the types and characteristics of atoms across different elements.

On the other hand, diversity is highlighted by different elements having unique atomic structures which produce different types of atoms. This diversity results in vast differences in physical properties across various forms of matter. By observing the atomic substructure, it is possible to understand why some elements are metals, others are nonmetals, and yet others are semiconductors. Furthermore, the behavior of atoms during combinations, for example, ionic or covalent bonding, provides another layer of diversity as it results in a vast array of complex molecules with distinct characteristics.

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Answer:

salad

Explanation:

A mixture is a substance that combines two or more substance that are physically combined. A mixture can be easily seperated by a physical means . A mixture is the combination of various substances that are not chemically combined .Examples of mixtures are cake and salad . The  cake contains various substances like egg, flour and sugar. This mixture can be easily separated into it individual entities by a physical means .

Base on the option the only mixture among the option is salad . Salad is a a mixtures that combines substances like tomatoes , fruits and vegetable. The individual substances that makes up the salad can be easily separated.

Sugar is a compound . Water is a compound as it contains two elements and potassium is an element.

How many moles of KNO3 are in 500 mL of 2.0 M KNO3?

1 mol KNO3

How many grams of CaCl2 are in 250 mL of 2.0 M CaCl2?

55   g CaCl2

What volume of a 6.67 M NaCl solution contains 3.12 mol NaCl?                 0.468   L

Answer:

Thermal Energy

Explanation:

is C and D an answer?

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Answer:    A) Fossils of the same organisms found in different continents

Explanation:  Continental drift is a theory, according to which, for a long period of time, continents moved one against the other across the ocean bed. This theory has been developed by several scientists, supplemented, rewritten, etc, but in essence this theory is explained by the theory of the tectonic plate, that is, the continents move by floating on the plates of the Earth's lithosphere. Evidence for this are similar fossils, animal and plant, found on different continents, which means that they were formed once on the same, one continent, before the separation and floating of continents one in relation to the other.

The statement 'fossils of the same organisms found in different continents' provides evidence that supports the continental drift theory (Option A).

In conclusion, the statement 'fossils of the same organisms found in different continents' provides evidence that supports the continental drift theory (Option A).

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The assertion that particles in an object at its freezing point have no kinetic energy is false. At the freezing point, the particles' motion is significantly reduced, but it is not completely eliminated. As a result, the particles maintain some level of kinetic energy.

In physics, the statement 'at the freezing point, the particles in an object have no kinetic energy' is false. Kinetic energy is the energy an object possesses due to its motion. When a substance reaches its freezing point, its particles are still in motion, but at a slower rate. They continue to vibrate, rotate, and occasionally move from place to place, although at a slower pace than in a liquid or gaseous state, reflecting that they still possess kinetic energy, albeit at a reduced level.

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The composition of a fertilizer is usually express in NPK number. NPK number is in terms of Percent by mass of the said element which are Nitrogen, Phosphorus and Potassium. A 15-35-15 fertilizer has 15% Nitrogen, 35% Phosphorous, and 15% Potassium by mass. If you have 10 g of this fertilizer, to get the number of moles of phosphorus, you multiply the mass by 35%, which is equal to 10*0.35 or 3.5 g phosphorus. Then you divide the calculated mass of phosphorous by its molar mass which is 30.97 g/mol. Therefore, you have 3.5/30.97 which is equal to 0.1130 mol Phosphorus. This is the amount of Phosphorus in moles in the fertilizer.

16.94 grams of oxygen is the correct answer

The answer is the second group :)

Answer:

The correct answer is "Element A is more reactive".

Explanation:

The missing options of this question are:

Element A is more reactive.

Element A is less reactive.

Element A and B have the same reactivity.

Element A has no reactivity.

The correct answer is "Element A is more reactive".

Valence electrons are defined as outer shell electron that can participate in the formation of chemical bonds with other atoms. The atoms tend to have either 0 or 8 valence electrons. Therefore, depending in the number of valence electrons, an atom can either give their valence electrons (1 to 3 electrons) or try to take more valence electrons (4 to 7 electrons). Element A with 7 valence electrons is more reactive that Element B with 4 valence electrons, because Element A only needs 1 more electron to full its 8 valence electrons.

Answer:

Most of the mass of an atom comes from the electron cloud

Explanation:

Protons are positive, Electrons are negative, and there are only protons and neutrons in the nucleus of an atom. Also there are only 6 electrons in a electron cloud and the mass of an electron is 1/1,836 the mass of a proton. So it would be the last answer.

Regarding the structure of an atom, it is false that most of the mass of an atom comes from the electron cloud.

Let's consider which of the following statements does not describe the structure of an atom.

Regarding the structure of an atom, it is false that most of the mass of an atom comes from the electron cloud.

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The answer is; All of them

A molecule is a stable chemical unit (with neutral charge) of atoms chemically bonded together (these bonds can be covalent, metallic, ionic, and etcetera). The molecule can, therefore, be of an element (contain atoms of the same element – in this case, N2 and O2) or a compound (atoms of different elements- in this case, H2O and NaCl).

Answer:Yes, the law of conservation of mass is true because even though some/2grames of mass was not there to end the 2 grams might have evaporated or escaped.

Explanation:

I got this right on flvs and more explanation is up there kinda. hope this helps

Answer:

Option b. 32S

Explanation:

Given:

No. of protons = 16

No. of neutrons = 16

Atomic number of an element is equal to the number of protons present in it.

Therefore, atomic number of the element = 16

Mass number of the element is equal to sum of number of protons and neutrons.

Therefore, Mass number = 16 + 16 = 32

Element 'S' has atomic number 16 and its mass number is 32.

So among the given options, option b is correct.

In evaporation particles of water take energy in the form of sunlight from the surrounding and then convert into vapor phase. Therefor evaporation is the only reason for the lot more water in air in summer

Evaporation is a physical process in which the water in liquid state converts to gaseous state at the temperature below its boiling point. Evaporation happens before the boiling process.

Evaporation causes cooling effect in the surrounding. During summer when water is kept in earthen pot water cools, this is because of the evaporation process

Evaporation is affected by temperature. As the temperature increases the rate of evaporation increases and hence in summer there is more evaporation and hence there is lot more water in air

Therefor evaporation is the only reason for the lot more water in air in summer

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Final answer:

The increased water in the air during hot summer days is a result of evaporation, where the sun's heat transforms liquid water into water vapor increasing the humidity in the air.

Explanation:

During hot summer days, the increased water in the air is primarily due to the change of state called evaporation. Evaporation is a process where liquid water on Earth's surface, like lakes and rivers, absorbs heat from the sun and transforms into water vapor. This vapor then enters the atmosphere contributing to the higher humidity we experience during summer times.

Evaporation happens when the sun heats the water, providing energy for the water molecules to escape from the liquid's surface into the air as vapor. It is one of the critical phases in the water cycle, and unlike condensation, which is the change of water vapor into a liquid, evaporation changes liquid into gas. This process is essential as it contributes to cloud formation and precipitation, playing a vital role in weather patterns and ecosystems.

In a galvanic cell composed of aluminum and sodium electrodes, sodium is the metal that is oxidized because it has a more negative standard electrode potential, indicating a tendency to lose electrons more readily than aluminum.

In a galvanic cell, the metal that is oxidized is the one that loses electrons. Oxidation takes place at the anode of the cell. To determine which metal is oxidized between aluminum and sodium in a galvanic cell, we consider their standard electrode potentials. The metal with the more negative standard electrode potential tends to lose electrons and get oxidized. In this case, aluminum has a standard reduction potential of -1.66 V, while sodium has a standard reduction potential of -2.71 V. Since aluminum is less negative, it is the more noble metal and is less likely to lose electrons compared to sodium.

Therefore, in a galvanic cell made up of an aluminum electrode and a sodium electrode, sodium will be the metal that is oxidized. This is because sodium has the more negative standard electrode potential and, consequently, a greater tendency to lose electrons. The half-reaction for sodium at the anode would be

Na(s) ⇒ Na⁺(aq) + e⁻.

In contrast, aluminum will be reduced at the cathode in this cell.