PLEASE HELP!
How many moles of NaOH would produce 10 moles of water in this reaction?
2NaOH + H2SO4 → Na2SO4 + 2H20

Answer:

Cloud form

Explanation:

Evaporation happens when a liquid substance becomes a gas. When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor. ... Once water evaporates, it also helps form clouds.

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The Ancient Egyptians used simple sundials and divided days into smaller parts, and it has been suggested that as early as 1,500BC, they divided the interval between sunrise and sunset into 12 parts. ... Known as a clepsydra, it uses a flow of water to measure time.

Answer:

I found this!

Electrochemical methods depend upon electrochemical cells because they involve the conversion of chemical energy into electrical energy, or vice versa. An electrochemical cell consists of two electrodes, one of which is the anode and the other is the cathode, which are separated by an electrolyte. The anode and cathode are connected by an external circuit, allowing electrical current to flow through the cell.

In an electrochemical method, a chemical reaction occurs at the electrodes, and the electrons involved in that reaction flow through the external circuit. This flow of electrons generates an electrical current, which can be measured and used to determine the amount of a substance present in a sample. Additionally, by applying an external voltage to the cell, chemical reactions can be forced to occur, and this is the basis of electro-synthesis, the production of chemical compounds.

In summary, electrochemical methods rely on the use of electrochemical cells because they allow for the conversion of chemical energy into electrical energy, and this electrical energy can be measured and used to determine the amount of a substance present in a sample or to generate chemical compounds.

Explanation:

Electrochemical methods depend upon electrochemical cells because they involve the conversion of chemical energy into electrical energy, or vice versa.

An electrochemical cell consists of two electrodes, one of which is the anode and the other is the cathode, which are separated by an electrolyte. The anode and cathode are connected by an external circuit, allowing electrical current to flow through the cell.

In an electrochemical method, a chemical reaction occurs at the electrodes, and the electrons involved in that reaction flow through the external circuit. This flow of electrons generates an electrical current, which can be measured and used to determine the amount of a substance present in a sample.

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An exothermic reaction has B. a negative ΔH, gives off heat to the surroundings, and feels warm to the touch.

In an exothermic reaction, energy is released as heat, which is why it has a negative ΔH value. This negative sign indicates that the products of the reaction have lower energy than the reactants. As a result, the excess energy is given off to the surroundings, making the environment feel warmer.

When you touch an object undergoing an exothermic reaction, it feels warm because heat is being transferred from the reaction to your hand. This transfer of heat is the reason behind the warm sensation, which is a typical feature of exothermic reactions. In contrast, an endothermic reaction would have a positive ΔH, absorb heat from the surroundings, and feel cold to the touch. In this case, the reaction requires energy input, which is taken from the environment. As a result, the surroundings feel colder during an endothermic reaction.

To summarize, an exothermic reaction is defined by a negative ΔH, heat is released to the surroundings, and a warm sensation upon touch. This is the direct opposite of an endothermic reaction, which absorbs heat and feels cold to the touch.

The question was Incomplete, Find the full content below :

An exothermic reaction has
A. A negative ΔH, absorbs heat from the surroundings and feels cold to the touch.

B. A negative ΔH, gives off heat to the surroundings and feels warm to the touch.

C. A positive ΔH, gives off heat to the surroundings and feels warm to the touch.

D. A positive ΔH, absorbs heat from the surroundings and feels cold to the touch.

E. A positive ΔH, absorbs heat from the surroundings and feels warm to the touch.

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Answer:

A. its reactivity

Explanation:

It's reactivity because copper was exposed to air and if it is reactivity it must be exposed to air

Answer:

A.  reactivity

Explanation:

Answer: An ignition source is a process or event which can cause a fire or explosion. Open flames, sparks, static electricity, and hot surfaces are all possible ignition sources. An explosion can occur when flammable gases or vapors in the air come in contact with an ignition source such as a spark.

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The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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Answer:

is there supposed to be a photo with this?

Explanation:

Answer:

dam i dont even know this

Explanation:

The change in enthalpy for dissolving urea is 32 J, rounded to the nearest whole number, 32.4 J.

The change in enthalpy for dissolving urea can be calculated using the following equation: ΔH = m * c * ΔT, where m is the mass of the solute, c is the specific heat capacity of the solvent, and ΔT is the change in temperature.

In this example, m = 3.85 g, c = 4.184 J/g-K, and ΔT = 2.11 K. Plugging in these values, we get ΔH = 3.85 * 4.184 * 2.11 = 32.4 J. Thus, the change in enthalpy for dissolving urea is 32 J, rounded to the nearest whole number.

The change in enthalpy for dissolving urea is dependent on the properties of the solute and the solvent. As such, the ΔH value can vary depending on the solute-solvent combination and the temperature at which the solution is made.

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Answer:

can you please type english?Explanation:

Explanation:

Density = mass/volume

.: volume = mass/density

Volume = 77/3.5

Volume = 22cm³

Al(NO3)3 solution concentration and the concentration of H3O+ ions in the solution following the addition of HNO3 are given in the problem. We can determine the presence of [Al(H2O)5(OH)2+] in the solution using this knowledge along with the known equilibria for the hydrolysis of Al3+.

For Al3+, the hydrolysis process may be expressed as follows:

Al(H2O)63+ + water becomes Al(H2O)5(OH)2+ + H3O+.

The reaction's equilibrium constant expression is as follows:

Al(H2O)5(OH)2+) = K

Al(H2O)63+ / [H3O+]

We must take into account the dissociation of Al(NO3)3 in water in order to determine [Al(H2O)5(OH)2+] in a 0.15 M solution of Al(NO3)3:

Al3+ (aq) + 3NO3- Al(NO3)3 (s) (aq)

Al3+ has a concentration of 0.45 M (3 times that of the Al(NO3)3 solution) in an Al(NO3)3 solution with a concentration of 0.15 M. H3O+ is present in the solution at a concentration of 0.10 M.

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Answer:

true

Explanation:

An example of homolytic fission of chloromethane would be when it is exposed to ultraviolet light, which can break the C-Cl bond homolytically, resulting in the formation of a methyl radical (CH₃•) and a chlorine radical (Cl•): CH₃Cl + hv → CH₃• + Cl•

In this reaction, each atom receives one electron from the C-Cl bond, resulting in two unpaired electrons, which are characteristic of free radicals.

An example of heterolytic fission of chloromethane would be its reaction with a strong nucleophile, such as hydroxide ion (OH⁻), in which the C-Cl bond breaks heterolytically, resulting in the formation of a chloride ion (Cl⁻) and a methyl cation (CH₃⁺):

CH₃Cl + OH⁻ → Cl⁻ + CH₃OH

In this reaction, the hydroxide ion acts as a nucleophile, attacking the carbon atom in chloromethane and causing the C-Cl bond to break unevenly, with the chlorine atom retaining both electrons from the bond to form a chloride ion, and the carbon atom retaining the positive charge to form a methyl cation.

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a weak acid. The Ka (acid dissociation constant) is a measure of the strength of an hydrofluoric acid in solution. It is defined as the equilibrium constant for the dissociation reaction of the acid in water,.

which is usually written as:

HA + H2O → H3O+ + A-

A lower Ka value indicates that the acid is a weak acid, meaning that it does not dissociate very well in water and thus has a low concentration of H3O+ ions. A higher Ka value indicates that the hydrofluoric acid is a strong acid, meaning that it dissociates very well in water and thus has a high concentration of H3O+ ions. Given that the Ka for hydrofluoric acid is 7.2 x 10-4, this means that hydrofluoric acid is a weak acid. This means that it does not dissociate very well in water and thus has a low concentration of H3O+ ions. It is a weaker acid than the strong acids like Hydrochloric acid, Sulfuric acid, Nitric acid and many others.

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Answer:

Its high

Explanation:

Becuase if u times it what do u get

One of the commonly used antioxidants in food products is DATEM, or Diacetyl Tartaric Acid Esters of Mono and Diglycerides. It is a food emulsifier and a dough strengthener that is added to various baked goods such as bread, cakes, and pastries.

DATEM helps to improve the texture and appearance of the finished product and also extends its shelf life by preventing oxidative damage. Oxidation is a chemical process that occurs when food is exposed to air and can cause the development of off-flavors and spoilage. Antioxidants such as DATEM prevent this by neutralizing free radicals that are produced during oxidation.

In addition to DATEM, other common antioxidants used in food products include vitamin E, ascorbic acid (vitamin C), and butylated hydroxyanisole (BHA). It is important to note that while antioxidants are generally considered safe, excessive intake of certain types may have adverse effects on health.

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The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

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The E2 reaction proceeds with anti-periplanar stereochemistry, resulting in the formation of diastereomeric alkenes for alkyl halides (a) and (b). The products will have different configurations of alkene substituents, which should be drawn as regular lines.

An E2 reaction proceeds with anti-periplanar stereochemistry, meaning the leaving group and the hydrogen being eliminated must be on opposite sides of the molecule. To draw the products of each elimination for diastereomeric alkyl halides (a) and (b), follow these steps:
Step:1. Identify the leaving group (usually a halogen) and the hydrogen that will be eliminated (usually bonded to the adjacent carbon).
Step:2. Ensure that these groups are anti-periplanar (opposite sides) in the starting molecule.
Step:3. Remove the leaving group and the hydrogen, and form a double bond between the carbon atoms that were bonded to these groups.
Step:4. Draw the resulting alkene with substituents as regular lines, not dashes or wedges, as mentioned in your question.
Since the alkyl halides in (a) and (b) are diastereomers, their products will also be diastereomeric alkenes. Diastereomers are stereoisomers that are not mirror images of each other. This means that the products of these two reactions will have different configurations of their substituents around the double bond, but will not be mirror images.

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Answer:

The US surgeon general's 1964 report declared that smoking cigarettes was linked to cancer .

The average global temperature of the Earth has increased by almost two degrees in the last century.

Explanation:

Science and pseudoscience differs in terms of scientific methods involved in any study. Science deals with the practices and beliefs that undergo a method of scientific study. Pseudoscience is the term associated with the ideas and beliefs that tend to be scientific in nature but they fail in their execution of following the scientific methods.  

From the given options, two of them are the examples of science and not pseudoscience.

Each lattice is a single large molecule of some substance. These lattices are held together by some ionic bonding. Therefore, ionic bond can often be considered as intermolecular.

An ionic bond is formed between a metal and a non-metal. Electrons are transferred from the electropositive metal to the nonmetal. This loss or gain of electrons make the metals cations and the nonmetal becomes anions. The electrostatic attraction between these opposite ions make the ionic bond.

Ionic compounds are existing as crystalline lattices with well ordered edges where the ions and electrons are located One basic unit of the whole lattice is connected to other units.

Therefore, the charged ends of the ionic compounds can be connected with the charged end of other molecules. In this way ionic bonding can be described as intermolecular. Hence, option C is correct.

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Answer:

C2H2 + 5 O2 = 4 CO2 + 2 H2O

Add / Edited: 27.09.2014 / 25.01.2015

Evaluation of information: 5.0 out of 5 / number of votes: 2

Source: https://chemiday.com/en/reaction/3-1-0-339

Explanation:

Speed = 0.3 m/s

Time = 20 s

We know, Speed = Distance/ Time

or, Distance = Speed × Time

Therefore, the distance travelled by the insect

= (0.3×20) m

= 6 m

The insect will travel 6 m.

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Answer:

Manganese

Explanation:

The electronic configuration of the atom is:

         1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵

The powers in this configuration is the number of electrons in each orbital:

2 + 2 + 6 + 2 + 6 + 2 + 5  = 25

The compound has 25 electrons and it is Manganese

The electron configuration 1s22s22p63s23p64s23d5 corresponds to the element manganese (Mn).

In the electron configuration provided:

1s2 represents the filling of the 1s subshell with two electrons.

2s2 represents the filling of the 2s subshell with two electrons.

2p6 represents the filling of the 2p subshell with six electrons.

3s2 represents the filling of the 3s subshell with two electrons.

3p6 represents the filling of the 3p subshell with six electrons.

4s2 represents the filling of the 4s subshell with two electrons.

3d5 represents the filling of the 3d subshell with five electrons.

Based on this electron configuration, we can correctly identify the element as manganese (Mn), which has an atomic number of 25.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question we have

\(density = \frac{698}{50.5} \\ = 13.8217...\)

We have the final answer as

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