how did ernest rutherford change the atomic model?

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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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.

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

The correct chemical name and formula for a compound that has one carbon atom and four chlorine atoms is carbon tetrachloride, represented by the formula CCl4. Therefore option 1 is correct.

"carbon tetrachloride; CCl4," is the correct answer. Carbon tetrachloride is a compound composed of one carbon atom (C) bonded to four chlorine atoms (Cl).

The prefix "tetra-" indicates that there are four chlorine atoms, and "chloride" refers to the chlorine ion. Therefore, the name "carbon tetrachloride" accurately describes the compound's composition.

Thus, the correct chemical name and formula for a compound with one carbon atom and four chlorine atoms is carbon tetrachloride (CCl4).

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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

16.94 grams of oxygen is the correct answer

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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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:

Thermal Energy

Explanation:

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.

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.

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 events in order as the temperature of a gas in a container slowly increases are -

The molecules of the gas begin to gain kinetic energy.

The fast-moving molecules strike the sides of the container more often.

The molecules striking the sides increase the pressure of the gas.

The molecules of gas use increased energy to move more quickly.

The container breaks open under extreme pressure.

As the temperature of a gas in a container increases, the gas molecules gain kinetic energy and move faster. This leads to more frequent and energetic collisions with the container walls, causing an increase in pressure inside the container.

With further temperature rise, the gas molecules gain even more energy, moving more rapidly and colliding with greater force. If the temperature and pressure exceed the container's structural limits, it may break open.

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Answer is: B) velocity because the direction is changing.

Velocity is equivalent to a specification of its speed and direction of motion, for example 100 km/h to the east.

Velocity is a physical vector quantity (measured in metres per second) and need magnitude and direction to define it, for example 100 metres per second east.

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.