which element requires the least i.e. potassium or gallium why

Answer:

what r the statements?

Explanation:

attach or write them

Answer:

A. He is determining physical properties that are sufficient to identify the metal.

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Answer: potassium and rubidium

Explanation:

1) The group 1 of the periodic table contain six elements namely Lithium(Li), Sodium(Na),Potassium(K),Rubidium(Rb),Cesium(Cs) and Francium(Fr). These metals are called alkali metals because they form alkalies( i.e. strong bases capable of neutralizing acids) when they react with water.

2) The heavier alkali metals (K, Rb, and Cs) react so vigorously that they invariably explode.

3) This trend, which is not consistent with the relative magnitudes of the reduction potentials of the elements, serves as another example of the complex interplay of different forces and phenomena—in this case, kinetics and thermodynamics.

It will take 2.18 minutes to completely consume 2.50 grams of magnesium in the given electrochemical cell with a current of 0.750 amps.

To calculate the time it would take to completely consume 2.50 grams of magnesium (Mg) in an electrochemical cell with a current of 0.750 amps, we need to use Faraday's law of electrolysis;

m = (Q × M) / (n × F)

where:

m = mass of substance consumed or deposited (in grams)

Q = charge passed through the cell (in coulombs)

M = molar mass of the substance (in grams/mol)

n = number of electrons transferred per mole of substance during the electrolysis

F = Faraday constant (96,485 C/mol)

In this case, we are given the mass of magnesium (2.50 grams), the current for the cell (0.750 amps), and the molar mass of magnesium (24.31 g/mol). We can determine the number of electrons transferred per mole of magnesium from the balanced half-reaction during the electrolysis of Mg;

Mg²⁺ + 2e⁻ → Mg

So, n = 2.

First, we need to calculate the charge passed through the cell (Q) using the equation;

Q = I × t

Since the current is given as 0.750 amps, we can use this value for I. We need to convert the time from minutes to seconds by multiplying by 60;

t = 60 minutes × 60 seconds/minute = 3600 seconds          

Now we can substitute all the known values into the equation for Faraday's law of electrolysis and solve for time (t);

m = (Q × M) / (n × F)

t = m × (n × F) / (I × M)

t = (2.50 g) × (2 × 96485 C/mol) / (0.750 A × 24.31 g/mol)

t ≈ 1308 seconds or 21.8 minutes.

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The moles of water that are produced from 373 moles of ammonia present in any chemical reaction is 746 moles.

Stoichiometry of the reaction gives idea about the amount of entities present in any chemical reaction before and after the reaction.

Given chemical reaction is:

3Al + 3NH₄ClO₄ → Al₂O₃ + AlCl₃ + 3NO + 6H₂O

From the stoichiometry of the reaction it is clear that:

3 moles of Al = produces 6 moles of H₂O

373 moles of Al = produces 6/3×373 = 746 moles of H₂O

Hence required moles of water is 746 moles.

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Answer:

I think the answer is Temperature but i don't know your options so I'm just going off of my test

Explanation:

d. all of the above

AnswerD:

Explanation:

Answer:

fossils are like bones of dinosaurs and other animals. fossil fuels are non renewable sources like natural gas, coal, and nuclear energy. (there is more than those)

Explanation:

Krypton (Kr) has an atomic number of 36, which means it has 36 electrons in its neutral state.

In the ground state, these electrons occupy various orbitals according to the Aufbau principle, which states that electrons fill orbitals in order of increasing energy.

The electron configuration of krypton in its ground state is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

The p subshell contains three orbitals (px, py, and pz), each of which can hold a maximum of two electrons. In krypton's ground state, there are a total of six electrons occupying the p orbitals: 2 electrons in the 3p subshell and 4 electrons in the 4p subshell. Therefore, the number of p orbitals occupied by electrons in a krypton atom in its ground state is 6.

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The mole ratio for Potassium and Sodium in the balanced equation 2 Na + K2S → 2K + Na2S is 2:2 or 1:1.

To find the mole ratio, we need to look at the coefficients in front of the elements in the balanced equation. The coefficient for Sodium (Na) is 2 and the coefficient for Potassium (K) is also 2. This means that for every 2 moles of Sodium, there are 2 moles of Potassium. We can simplify this ratio by dividing both sides by 2 to get a 1:1 ratio.

So, the mole ratio for Potassium and Sodium in this balanced equation is 1:1. This means that there is an equal amount of moles of Potassium and Sodium in the reaction.

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Answer:

Due to the accumulation of static charges/due to static electricity

The light from an OLED device is produced by the emission of a photon associated with the relaxation of an electron.

Organic Light-Emitting Diodes (OLEDs) are a type of display technology used in various electronic devices such as smartphones, televisions, and laptops. OLEDs consist of a thin layer of organic material sandwiched between two electrodes. When a voltage is applied to the electrodes, electrons and holes (positively charged particles) are created and move towards each other. When the electrons and holes meet, they combine and release energy in the form of photons, which is the light that we see in the OLED device. The light produced in an OLED device is due to the relaxation of electrons to a lower energy level and the emission of a photon associated with this process. This makes OLEDs a highly efficient and versatile lighting technology as they are capable of producing high-quality, color-rich images with excellent contrast and brightness.

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Answer:

Hydrogen (H) “burning” initiates the fusion energy source of stars and leads to the formation of helium (He).

FUSION Reaction

Explanation:

mark me brainliest please.

One reason why so many aliphatic amino acids are essential is that they cannot mix with water, and therefore cannot be synthesized by the body.

Another reason is that the human body lacks the enzymes necessary to produce these amino acids.

Aliphatic amino acids are essential because humans cannot produce them on their own. They must be obtained from the diet, which is why they are called "essential" amino acids.

Aliphatic amino acids are non-polar and hydrophobic, and their hydrophobicity increases as the number of carbon atoms on the hydrocarbon chain increases.

Histidine, an aliphatic amino acid, is also essential because it contains a functional group that is important for many biological processes.

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Answer:

....

Explanation:

Compound A is likely an organic halide, Compound B is a derivative of benzene, Compound C is benzene itself, and Compound C can be converted into toluene through a Friedel-Crafts alkylation reaction.

i) Compound A is an alkene.

When heated with silver powder, it undergoes oxidative cleavage to produce Compound B which is an aldehyde.

So the IUPAC names of Compound A and Compound B are ethene and ethanal, respectively.

ii) The acidic nature of Compound B can be proved by treating it with sodium hydrogen carbonate. If effervescence occurs, it is due to the evolution of carbon dioxide gas.

This indicates that Compound B is acidic in nature and reacts with a base to form salt and water.

iii) When Compound C (Benzene) reacts with bromine in the presence of catalyst FeCl3, Bromine water is decolorized to form a colorless solution.

This is an addition reaction that occurs due to the presence of an electron-rich benzene ring.

iv) Compound C (Benzene) can be converted into Toluene (Methylbenzene) through a process known as Friedel-Crafts Alkylation, where Benzene is allowed to react with Chloromethane (Methyl chloride) in the presence of Lewis acid catalyst, Aluminum chloride (AlCl3).

The resulting product is then heated to obtain Toluene (Methylbenzene).

The chemical reaction for the conversion of Benzene to Toluene is given below:C6H6 + CH3Cl → C6H5CH3 + HCl

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Answer:

Distance

Explanation:

The light-year is a measure of distance, not time. It is the total distance that a beam of light, moving in a straight line, travels in one year.

Answer:

distance pooh <3

Explanation:

Answer:

Bacteria

Explanation:

bactiera are single-celled oraganism.

Answer:

bacteria

Explanation: cuz i said so

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 785 × 27

We have the final answer as

Hope this helps you

Folded mountains like the himalayan mountains form along the boundary type is the convergent, both continental crust plates.

When two continental crust plates collide, they create folded mountains. This is because continental crust is thicker and less dense than oceanic crust, so when the two plates collide, they cannot easily sink into the mantle. Instead, they push against each other and fold upwards, creating mountain ranges like the Himalayas.

In contrast, when two oceanic crust plates collide (convergent, both oceanic crust plates), one plate typically sinks under the other, creating a subduction zone. When two oceanic crust plates move away from each other (divergent, both oceanic crust plates), new oceanic crust is created at the boundary. When two continental crust plates move away from each other (divergent, both continental crust plates), a rift valley is created. Therefore, the correct answer is convergent, both continental crust plates.

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Answer:

on it iis renewable energy it is independent

Answer:

1. It is stoichiometric.

2. O2 is the limiting reactant.

3. 9.0 g of C2H6 remain unreacted.

4. 17.6 g of CO2.

5. 85.2%.

Explanation:

Hello there!

In this case, for the given chemical reaction:

\(2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O\)

We can see that:

1. It is stoichiometric and is balanced because the reactants yields the products according to the law of conservation of mass.

2. In this part, it is possible to calculate the moles of ethane by using its molar mass:

\(n_{C_2H_6}=15g*\frac{1molC_2H_6}{30.08g} =0.50molC_2H_6\)

And the moles of oxygen by knowing that one mole is contained in 22.4 L at STP:

\(n_{O_2}=\frac{1mol}{22.4L} *15.68L=0.7molO_2\)

Thus, by calculating the moles of carbon dioxide product by each reactant, we can identify the limiting one:

\(n_{CO_2}^{by\ C_2H_6}=0.50molC_2H_6*\frac{4molCO_2}{2molC_2H_6} =1.0molCO_2\\\\n_{CO_2}^{by\ O_2}=0.70molO_2*\frac{4molCO_2}{7molO_2} =0.4molCO_2\\\)

Thus, since oxygen yields the fewest moles of CO2 product, we infer it is the limiting reactant.

3. In this part, we calculate the mass of C2H6 that actually react first:

\(m_{C_2H_6}^{reacted}=0.4molCO_2*\frac{2molC_2H_6}{4molCO_2}*\frac{30.08gC_2H_6}{1molC_2H_6} =6.0gC_2H_6\)

Thus, the leftover of ethane (C2H6) as the excess reactant is:

\(m_{C_2H_6 }^{leftover}=15g-6.0g=9.0g6.0C_2H_6\)

4. Since 0.4 moles of carbon dioxide were produced, we use its molar mass to calculate the mass as its theoretical yield:

\(m_{O_2}^{theoretical}=0.4molCO_2*\frac{44gCO_2}{1molCO_2}=17.6gCO_2\)

5. Finally, the percent yield is gotten by dividing the actual yield by the theoretical one:

\(Y=\frac{15g}{17.6}*100\%\\\\Y=85.2\%\)

Best regards!

Answer:

false

Explanation:

the magnetic domains in the area around a magnet where the force acts.

The law. of conservation of mass shows correct statment that matter is conserved in chemical reaction.

In simple words, Matter is defined as the substance which have mass and occupy some volume.

Matter is of different type in terms of phase:

Solid

Liquid

Gas

An element is defined as a fundamental item which can not be easily broken into further smaller pieces. In physics and chemistry, an element is a substance which can not be broken down by any kind of non-nuclear reactions.

Chemical compound is defined as a chemical substance which is composed of many different identical molecules containing atoms from more than one chemical element which held together by the chemical bonds. A molecule is composed of atoms of only one type of element is therefore not a compound.

The law of conservation of mass states that mass neither be created nor be destroyed in an reaction but it converted from one form to another form in the reaction

Thus, we concluded that the law of conservation of mass shows correct statment that matter is conserved in chemical reaction.

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This is super late so forgive me LOL but the answer is the number of atoms in the reactants is always equal to the number of atoms in the products.

Density is Mass per Volume

so

0,8765 g/ml = Mass of Benzene / 250 ml

Mass of Benzene = 219,125 gram

so 250 ml of benzene is equal to 219,125 gram

True. When ionic compounds are dissolved or thrown into water, they typically dissociate into ions and become electrolytes.

An electrolyte is a substance that conducts electric current when dissolved in water or molten form due to the presence of freely moving ions. Ionic compounds consist of positively charged cations and negatively charged anions held together by electrostatic forces. When they come into contact with water, the water molecules surround the ions and weaken the forces holding them together, causing the compound to dissociate into its constituent ions. These ions are then free to move in the aqueous solution and carry electric charge, allowing the solution to conduct electricity. Therefore, most ionic compounds can be considered electrolytes when dissolved in water.

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Answer:

Ag+ (aq) + Cl- (aq) → AgCl (s)

Explanation:

The reaction between silver nitrate and sodium chloride is a double displacement reaction, where silver cations (Ag+) from silver nitrate react with chloride anions (Cl-) from sodium chloride to form solid silver chloride (AgCl) precipitate.

The balanced chemical equation for this reaction is:

AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq)

To write the net ionic equation, we need to eliminate the spectator ions (ions that do not participate in the reaction). In this case, the sodium cation (Na+) and the nitrate anion (NO3-) are spectator ions because they appear unchanged on both sides of the equation.

The net ionic equation for the reaction is:

Ag+ (aq) + Cl- (aq) → AgCl (s)

This equation shows that silver cations (Ag+) and chloride anions (Cl-) react to form solid silver chloride (AgCl) precipitate, which is responsible for the cloudy appearance of the solution.

The wavelength of the football thrown by an NFL quarterback traveling at 50 mph is approximately 6.99 x 10^-35 m.

To calculate the wavelength of the football, we need to first calculate its velocity in meters per second.

We can convert 50 mph to meters per second as follows:

1 mph = 0.44704 m/s (conversion factor)

50 mph = 50 x 0.44704 m/s

50 mph = 22.352 m/s (velocity of the football)

Next, we need to calculate the momentum of the football using the equation:

p = mv , where p is momentum, m is mass, and v is velocity.

We can convert the mass of the football from grams to kilograms as follows:

425 g = 0.425 kg (conversion factor)

So, the momentum of the football is:

p = mv

p = 0.425 kg x 22.352 m/s

p = 9.498 kg*m/s

Finally, we can calculate the wavelength of the football using the equation:

wavelength = h/p

where h is Planck's constant (6.626 x 10^-34 J*s).

So, the wavelength of the football is:

wavelength = h/p

wavelength = (6.626 x 10^-34 Js)/(9.498 kgm/s)

wavelength = 6.99 x 10^-35 m

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The wavelength of the football is λ = 7.17 * 10^-{26} nm .

The wavelength of the football can be calculated using the de Broglie wavelength equation: λ = h/mv, where h is Planck's constant, m is the mass of the object, v is the velocity of the object.
First, we need to convert the mass of the football from grams to kilograms: 425 g = 0.425 kg.
Next, we need to convert the velocity from mph to m/s: 50 mph = 22.35 m/s.
Now we can plug in the values into the equation:
λ = \frac{(6.626 * 10^{-34} J*s) }{ (0.425 kg * 22.35 m/s) }
λ = 7.17 * 10^{-26} nm
Therefore, the correct answer is C) 7.17 * 10^-{26} nm.
It's important to note that this calculation assumes that the football is behaving as a wave, which is not necessarily the case in reality. However, this calculation can still provide a useful estimate of the football's wavelength.

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Answer:

C

Explanation:

The chiral reagent is used to determine the optical activites of Sharpless reagent using one of two different chiral reagents along with a titanium catalyst and tetra-butyl hydroperoxide.

The reagent is mostly used in analytical chemistry to distinguish between the optical activities of the chiral carbons in analytical chemistry.

The tetra-butyl hydroperoxide is an optically active compound and chiral reagents use to know about the symmetry of carbons.

Therefore, the chiral reagent is used to determine the optical activities of the Sharpless reagent using one of two different chiral reagents along with a titanium catalyst and tetra-butyl hydroperoxide.

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