A 140. 5 g sample of niso4•xh2o was heated until no further mass decrease was noted. The remaining sample was assumed to be anhydrous niso4 with a mass of 77. 5 g. First determine the moles of anhydrous niso­4 and moles of h2o lost. What is the mole ratio of niso4 to water?.

Answer:a mouse

Explanation:

Answer: a mouse

Explanation:

Answer:

The mole and Avogadro’s number are two important concepts of science that provide a link between the properties of individual atoms or molecules and the properties of bulk matter. It is clear that an early theorist of the idea of these two concepts was Avogadro. However, the research literature shows that there is a controversy about the subjects of when and by whom the mole concept was first introduced into science and when and by whom Avogadro’s number was first calculated. Based on this point, the following five matters are taken into consideration in this paper. First, in order to base the subject matter on a strong ground, the historical development of understanding the particulate nature of matter is presented. Second, in 1811, Amedeo Avogadro built the theoretical foundations of the mole concept and the number 6.022 × 1023 mol−1. Third, in 1865, Johann Josef Loschmidt first estimated the number of molecules in a cubic centimetre of a gas under normal conditions as 1.83 × 1018. Fourth, in 1881, August Horstmann first introduced the concept of gram-molecular weight in the sense of today’s mole concept into chemistry and, in 1900, Wilhelm Ostwald first used the term mole instead of the term ‘gram-molecular weight’. Lastly, in 1889, Károly Than first determined the gram-molecular volume of gases under normal conditions as 22,330 cm3. Accordingly, the first value for Avogadro’s number in science history should be 4.09 × 1022 molecules/gram-molecular weight, which is calculated by multiplying Loschmidt’s 1.83 × 1018 molecules/cm3 by Than’s 22,330 cm3/gram-molecular weight. Hence, Avogadro is the originator of the ideas of the mole and the number 6.022 × 1023 mol−1, Horstmann first introduced the mole concept into science/chemistry, and Loschmidt and Than are the scientists who first calculated Avogadro’s number. However, in the science research literature, it is widely expressed that the mole concept was first introduced into chemistry by Ostwald in 1900 and that Avogadro’s number was first calculated by Jean Baptiste Perrin in 1908. As a result, in this study, it is particularly emphasised that Horstmann first introduced the mole concept into science/chemistry and the first value of Avogadro’s number in the history of science was 4.09 × 1022 molecules/gram-molecular weight and Loschmidt and Than together first calculated this number.

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Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule

Answer:

Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.

Hope this help's :)

Answer:

/dɪˈmɒkrəsi/

--noun--

A system of government by the whole population or all the eligible members of a state, typically through elected representatives.

The equilibrium composition of CO₂ is determined to be 0.59 kmol.

To solve this problem, we can use the ideal gas law and the equilibrium constant expression for the reaction:

CO + 1/2O₂ ⇌ CO₂

Given the initial number of moles of CO and O₂, we can set up an ICE (Initial, Change, Equilibrium) table. Let's assume that x kmol of CO is consumed and converted to CO₂. Then, the change in the number of moles for each species is:

CO: -x kmol

O₂: -0.5x kmol

CO₂: +x kmol

At equilibrium, the number of moles of CO is (2 - x) kmol, O₂ is (3 - 0.5x) kmol, and CO₂ is x kmol. The equilibrium constant expression can be written as:

Kp = (P_CO₂) / (P_CO * P_O₂(1/2))

Given Kp = 16.461 and the pressure conditions, we can substitute the equilibrium partial pressures into the expression:

16.461 = x / ((2 - x) * (3 - 0.5x)(1/2))

Solving this equation yields x ≈ 0.59 kmol.

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Filtration can be used to separate the water-soluble acetic acid from the aspirin. The limiting reagent will be salicyclic acid.

How can we determine the limiting reagent?

By dividing the volume of each solution by its molarity, you can determine how many moles of each reactant there are. By subtracting the number of moles of each reactant from its stoichiometric coefficient in the balanced chemical equation, you may determine which reactant is the limiting one.

How many grams of aspirin were created during the process of making it?

This resulted in an estimated value of 3.029 grams for crude synthesized aspirin. The final aspirin product's calculated mass after purification was 2.169 grams. A theoretical yield of 2.520 grams was computed.

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CaF₂ ⇒ Ca²⁺ + 2F⁻

1.75       1.75     3.5

Answer:

I and II

Explanation:

ANSWER

Water molecule is a compound

EXPLANATION;

Water molecule is formed from the combination of oxygen and hydrogen atoms

Recall, that compound is the combination of two or more elements that are chemically combined together

Therefore, water molecule is a compound

The electrochemistry underlying the electrical current in a neuron as it is stimulated involves sodium channels opening to allow sodium to enter the cell.
2. The most fundamental variable that can likely explain the evolution of bigger brains is the overall ecological complexity that the animal deals with.

During neuron stimulation, an action potential is generated. This process involves the depolarization of the neuron's membrane, which is achieved by the influx of positively charged ions, primarily sodium ions (Na+). When a neuron is stimulated, voltage-gated sodium channels in the cell membrane open, allowing sodium ions to rapidly enter the cell. This influx of positive charge depolarizes the membrane, creating an electrical current that propagates along the neuron.

Regarding the second question, the most fundamental variable that can likely explain the evolution of bigger brains is the overall ecological complexity that the animal deals with. Animals that inhabit complex and challenging environments often require enhanced cognitive abilities to navigate and respond to their surroundings effectively. The ecological complexity, such as varied food sources, social interactions, and environmental stimuli, can drive the evolutionary pressure for larger brain size and increased cognitive capacity. While factors like diet, sociality, and mating strategies may play a role, the overall ecological complexity is considered a crucial determinant of brain evolution.


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Answer:

2.22×10⁻⁹ M

Explanation:

Applying,

[OH⁻][H⁺] = 1×10⁻¹⁴................... Equation 1

Where [OH⁻] = Hydroxyl ion concentration, [H⁺] = Hydrogen ion concentration.

make [OH⁻] the subject of the equation,

[OH⁻] =  1×10⁻¹⁴/[H⁺]............... Equation 2

From the question,

Given: [H⁺] = 4.51×10⁻⁶ M

Substitute into equation 2

[OH⁻] = 1×10⁻¹⁴/4.51×10⁻⁶

[OH⁻] = 2.22×10⁻⁹ M

The learning pathways are created through the involvement of neurons and the brain's gray matter.

When an individual practices a skill, the process of creating new learning pathways in the brain is called neuroplasticity. The process involves the strengthening and creation of neural connections between neurons. This process occurs in the brain's gray matter, specifically in the cerebral cortex, which is responsible for motor control and learning.

The process of creating new learning pathways involves the activation of motor neurons, which send signals from the brain to the muscles. These neurons form connections with each other through the formation of synapses, which are strengthened through the process of myelination. The myelin sheath, a fatty coating that covers axons, insulates and speeds up nerve impulses, allowing for more efficient and effective communication between neurons.

Over time, with continued practice, these connections become more efficient and the pathway becomes more established. This process is known as long-term potentiation and is responsible for creating and strengthening new neural pathways in the brain, allowing for the acquisition and retention of new skills.

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The complete nuclear fusion of each reaction: 2 1 H (hydrogen) + 2 1 H (hydrogen) → 4 2 He (helium) + 1 0 n (neutron) + D (deuterium) + E (energy)

238 92 U (uranium)

Nuclear fusion is a process by which atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy in the process. In nuclear fusion reactions, lighter elements combine to form heavier ones, resulting in the release of energy. One example of a nuclear fusion reaction is the fusion of two hydrogen atoms, which results in the formation of helium, a neutron, and the release of energy in the form of deuterium and energy (D and E). Another example is the fusion of uranium, which can result in the formation of thorium, helium, and the release of energy in the form of fissile and energy (F and G). These reactions play a crucial role in powering the stars, including our sun, and hold great promise as a clean and virtually limitless energy source for the future.

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Answer:

D: 3

E: 2

F: 234

G: 90

Explanation:

You have to get what is on the right to add up to the left in that row.

Also right on edge 2023

Answer:

Phosphorous

Explanation:

Although elements such as gold, silver, tin, copper, lead and mercury have been known since antiquity, the first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.

Answer: 1.6 L

Explanation:

The new volume of the oxygen would be 0.16L when the pressure is increased to 25.00 atm.

The given problem can be solved using Boyle's law which states that when temperature and no. of moles of gas are constant the pressure is inversely proportional to volume.

let P1 = initial pressure

    V1 = initial volume

and P2 = final pressure

      V2 = final volume

Then from Boyle's law

P1V1=P2V2

V2=(P1V1)/P2

V2=(1.00atm*4.0L)/25.00atm

V2=0.16L

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Answer:

B. No more powder will dissolve in the water.

Explanation:

If a lot of powder is added to the water, then a fully saturated solution would be created. This means that no matter how much more powder is added or how strong the mix is shaken, no more powder will disolve. The powder will instead remain in solid form in the solution.

Answer:

Heat up the water first because it increases solubility of the powdered mix.

Explanation:

Took the test on Edg. Hope this helps!! :)

The pH of the resulting solution is approximately 4.3. To calculate the pH of the resulting solution, we need to use the equation for pH: pH = -log[H⁺]

First, let's calculate the number of moles of HCl that are present in the solution. We can use the formula:

moles = concentration * volume

Concentration of HCl = 1.0 M
Volume of HCl = 0.05 mL

= 0.05 * 10⁻³  L

= 5 * 10⁻⁵ L

moles of HCl = 1.0 M * 5 * 10⁻⁵ L

= 5 * 10⁻⁵ moles

Now, let's calculate the total volume of the resulting solution:

Total volume = 0.05 mL + 999.95 mL

= 1000 mL

= 1000 * 10⁻³ L

= 1 L

To calculate the concentration of H⁺ ions in the solution, we divide the moles of HCl by the total volume:

[H⁺] = moles of HCl / total volume

[H⁺] = 5 * 10⁻⁵ moles / 1 L

= 5 * 10⁻⁵ M

Finally, we can calculate the pH using the equation:

pH = -log[H⁺]

pH = -log(5 * 10⁻⁵)

= -(-4.3)

= 4.3

Therefore, the pH of the resulting solution is approximately 4.3.

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In a continuous reactor, the materials are transported as a stream that is always running, allowing the reactants to be continuously supplied into the reactor and producing a stream of product in the process.

Along with that, it ought to be necessary to know the mole counts of unreacted species. The amount of products created from each reactant can be compared in order to determine the limiting reactant.

When producing huge amounts of chemicals, a continuous reactor—also called a flow reactor—is employed.

Therefore, The mole number of the reactant and the finished product should be computed in order to determine the limiting reactant in a chemical reaction.

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The net force on the bag of rice is -10 N south  and the acceleration of the rice bag is -0.25 m/s².

The net force on the bag of rice is the sum of all the forces acting on it. In this case, the net force is 392 N upward
- 392 N downward + 10 N north - 20 N south
= -10 N south
To evaluate the acceleration of the sack of rice, we can use Newton's second law of motion which projects that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
The formula for this is
a = Fnet/m
Here,
a = acceleration,
Fnet = net force
m = mass.
For this case, the mass of the sack of rice is 40 kg. The net force acting on it is -10 N south.
Then, we can evaluate the acceleration as follows
a = Fnet/m
= -10 N south / 40 kg
= -0.25 m/s²

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The correct answer is A. A pH of 7 say about a solution is The solution is neutral.

A pH of 7 indicates a neutral solution. The pH scale is a logarithmic scale that measures the acidity or alkalinity (basicity) of a solution. A pH value of 7 is considered neutral, which means the concentration of hydrogen ions (H+) is equal to the concentration of hydroxide ions (OH-) in the solution. In other words, the solution is neither acidic nor basic.

Acidic solutions have a higher concentration of hydrogen ions (H+), which makes them more acidic. The lower the pH value, the higher the concentration of H+ ions and the stronger the acid.

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The given statement "an 802.11g NIC can communicate with an 802.11n access point operating in mixed mode" is True because it is a wireless standard for local area networks that was released in 2003.

It has a maximum data rate of 54 Mbps and operates on the 2.4 GHz frequency band. 802.11g is compatible with 802.11b and is backward compatible, which means that 802.11g can communicate with 802.11b devices. 802.11n is a wireless networking standard that was released in 2009. It has a maximum data rate of 600 Mbps and operates on both the 2.4 GHz and 5 GHz frequency bands. 802.11n is backward compatible with 802.11b and 802.11g.

It provides a better range and coverage than previous standards. Mixed mode is when an 802.11n access point is configured to support both 802.11n and 802.11g devices. In mixed mode, the access point can communicate with both 802.11n and 802.11g devices.

This allows older devices that support 802.11g to connect to the network while still allowing newer devices that support 802.11n to take advantage of the higher speeds and better coverage provided by 802.11n.

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Answer:

Because they cannot be separated into more then one type of substance.

Explanation:

Answer:

Elements are made of only one kind of atom. The particles can be a single atom or a molecule made of only one kind of atom. There is no physical change that can separate elements into more than one kind of substance. This makes an element a pure substance.An element is made up of only one type of atom. An element cannot be broken down into a simpler form.

Answer:

A substance that is present at the end of a chemical reaction.

The balanced half-reaction \(Pb(s) + SO4^2-(aq) → PbSO4(s) + 2e-\)

In a lead-acid battery during discharge, the anode is the negative electrode, and the half-reaction that occurs at the anode is the oxidation of lead (Pb) to lead sulfate (PbSO4).

Explanation of the half-reaction and how it fits into the battery's operation:

1. The anode consists of a lead (Pb) electrode, and during discharge, it undergoes an oxidation process.

2. Oxidation is the loss of electrons, so the lead atoms in the anode will lose electrons to become lead ions \((Pb2+)\).

3. The chemical equation for this oxidation process is: \(Pb(s) → Pb2+(aq) + 2e-\)

4. In the electrolyte solution, there are sulfate ions\((SO4^2-)\) from the sulfuric acid \((H2SO4)\).

5. These sulfate ions \((SO4^2-)\) will combine with the lead ions \((Pb2+)\) formed during the oxidation process.

6. The combination of lead ions\((Pb2+)\) and sulfate ions \((SO4^2-)\) forms lead sulfate \((PbSO4)\) as a solid on the anode.

7. The chemical equation for this combination is:\(Pb2+(aq) + SO4^2-(aq) → PbSO4(s)\)

8. Combining the oxidation and combination processes, we get the balanced half-reaction that occurs at the anode during discharge:
\(Pb(s) + SO4^2-(aq) → PbSO4(s) + 2e-\)

This half-reaction is crucial for the overall operation of a lead-acid battery, as it allows the transfer of electrons to the cathode, which powers the connected devices.

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Answer:

Below

Explanation:

The AMOUNT of matter the book contains is 2.5 kg.

   this mass is the same no matter where the book is located....on earth, the moon, in space....still 2.5 kg