PLEASE HELP!!! WILL MARK BRIANLIST DO NOT GUESS I HAVE ATTEMPTED THREE TIMES

Answer:

Concentration cell

Explanation:

Galvanic cells and even electrolytic cells usually consist of two electrodes namely anode and cathode. These 2 electrodes can either be made of the same metals or different metals, and also an electrolyte whereby the two electrodes are immersed.

Now, in the case where the electrodes are made of the same metal, we call it a concentration cell because A concentration cell is a cell that consists of two half-cells that have the same electrodes, but yet differ in concentrations.

Answer:

C. Water falls from the sky as rain. The water then flows downhill.

Explanation:

Water cycle can be defined as a process which typically involves the circulation (movement) of water between the Earth's atmosphere, land and ocean under various atmospheric conditions such as precipitation (rain and snow), transpiration, condensation and evaporation.

Basically, the movement of the water starts from the sky due to the condensation of water vapor to form clouds and later result to rainfall. Consequently, the rain water are either soaked by the soil or are made to flow down the hill.

The statement which best describes a way in which water moves in the water cycle is that, water falls from the sky as rain. The water then flows downhill or seeps into the ground.

Answer:

Explanation:

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Answer: The molecular formula is [tex]C_6H_{10}S_2[/tex]

Explanation:

We are given:

Mass of [tex]C[/tex] = 0.1605 g

Mass of [tex]H[/tex]= 0.0220 g

mass of [tex]S[/tex] = 0.1425 g

Step 1 : convert given masses into moles.

Moles of C =[tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{0.1605g}{12g/mole}=0.0134moles[/tex]

Moles of H =[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.0220g}{1g/mole}=0.0220moles[/tex]

Moles of S =[tex]\frac{\text{ given mass of S}}{\text{ molar mass of S}}= \frac{0.1425g}{32g/mole}=0.0044moles[/tex]

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = [tex]\frac{0.0134}{0.0044}=3[/tex]

For H = [tex]\frac{0.0220}{0.0044}=5[/tex]

For S =[tex]\frac{0.0044}{0.0044}=1[/tex]

The ratio of C : H: S=  3: 5: 1

Hence the empirical formula is [tex]C_3H_5S[/tex]

The empirical weight of [tex]C_3H_5S[/tex] = 3(12)+5(1)+1(32)= 73g.

The molecular weight = 146 g/mole

Now we have to calculate the molecular formula.

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{146}{73}=2[/tex]

The molecular formula will be=[tex]2\times C_3H_5S=C_6H_{10}S_2[/tex]

Answer:

C.

Explanation:

para sakin letter C ganonn

Answer:

1.89 × 10³ J

Explanation:

Step 1: Given data

Step 2: Calculate the heat (Q) required to melt the sample

The fusion is the phase change from solid to liquid. We can calculate the heat required for the fusion of the sample using the following expression.

Q = ΔH°fus × m

Q = 126 J/g × 15.0 g

Q = 1.89 × 10³ J

Answer:

mutualism, commensalism, and parasitism.

Question:

Three type of symbiosis

Answer:

Mutualism: both partners benefit. ...

Commensalism: only one species benefits while the other is neither helped nor harmed. ...

Parasitism: One organism (the parasite) gains, while the other (the host) suffers

Little Info.

Symbiosis is a close relationship between two species in which at least one species benefits. For the other species, the relationship may be positive, negative, or neutral. There are three basic types of symbiosis: mutualism, commensalism, and parasitism

Answer:

Mass percentage of TiO2 in the ore = 5.04%

Mass percentage of Ti = 3.01%

Explanation:

Equation of reaction is given below:

3 TiO2(s) + 4 BrF3(l) ---> 3 TiF4(s) + 2 Br2(l) + 3 O2(g)

From the equation of reaction above, 3 moles of O2(g) is obtained from 3 moles of TiO2(s)

Molar mass of O2 = 32 g/mol; molar mass of TiO2 = 79.87 g/mol, molar mass of Ti = 47.87 g/mol

Number of moles of O2 in 32.1 mg or 0.0321 g of O2 = 0.0321 g/32 g/mol = 0.001 moles

Therefore, 0.001 moles of O2 will be obtained from 0.001 moles of TiO2

Hence, mass l of 0.001 moles of TiO2 = 0.001 moles x 79.87g/mol = 0.07987

Mass percentage of TiO2 in the ore = 0.07987 x 100/1.586 = 5.04%

Mass of Ti in sample = (0.07987 - 0.03210) g = 0.04777 g

Mass percentage of Ti = 0.04777 × 100/1.586 = 3.01%

Answer:

c. enzyme activity is usually least active below its optimum pH

Explanation:

Enzyme activity depends highly on pH. Enzymes are biological molecules which are proteins and influence the rates of important biochemical reactions in the human body.

Enzymes has a value of pH at which it works most perfectly. This pH value is known as its optimum pH. Above or below this value, the enzyme does not function optimally.

Hence, a change in pH usually produces a change in enzyme activity because enzyme activity is usually least active below its optimum pH

Answer: the anwser is a. cuz i did it so im smart and u should listen to me

Explanation:non>

Answer:

52 g H2O (to 2 significant figures)

Explanation:

I hope you like my answer:)

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Answer:

Option B. 3.0 M

Explanation:

From the question given above, the following data were obtained:

Volume of solution = 3.0 L

Mole of MgCl₂ = 9 moles

Molarity =?

Molarity can simply be defined as the mole of solute per unit litre of the solution. Mathematically, it can be expressed as:

Molarity = mole of solute /Volume of solution

With the above formula, we can obtain the molarity of the solution as follow:

Volume of solution = 3.0 L

Mole of MgCl₂ = 9 moles

Molarity =?

Molarity = mole of solute /Volume of solution

Molarity = 9 / 3

Molarity = 3 mol/L = 3.0 M

Thus, the molarity of the solution is 3 M

The chemical formula for the unknown compound : N₂O₃

Given

6.2 mol of oxygen and 4.1 mol of nitrogen.

Required

The chemical formula

Solution

Chemical formulas can be expressed in terms of empirical or molecular formulas.

The empirical formula shows the simplest mole ratio of a compound

Meanwhile, the molecular formula shows the actual ratio of the number of elements that make up the compound

We divide the two known moles by the smallest mole (moles of nitrogen)

[tex]\tt N\div O=\dfrac{4.1}{4.1}\div \dfrac{6.2}{4.1}=1\div 1.5=2\div 3[/tex]

Answer:

The amount of Ml that is needed

Answer:

boron, aluminum, and gallium

Explanation:

They are in group 3A on the periodic table which means they have 3 valence electrons

Answer:

3.0585147719047385 is the answer

Answer:

17. The iron metal is oxidized to form the iron oxide known as rust.

19.A saturated solution will not dissolve any more solute and any extra solute added will simply stay as it is, without dissolving. An unsaturated solution has less solute than its solubility and hence can still add more solute, till it reaches the saturation level.

26 An Overflowing Population. The swelling American population played a large part in the decision Americans made to head, The Government Opens Up New Land. The American government itself encouraged its citizens to move west

32. The periodic table was first assembled in 1869 by a Russian chemist named Dmitri Mendeleev. He came up with a way of organizing the elements that were known at the time, arranged them in order of atomic weight, and then grouped them into rows and columns based on their chemical and physical properties. Here is a unique "Mayan" format Periodic Table. Elements in the same group are those that are in a single vertical line from top to bottom. They have the most in common between the two directions. They share the same number of electrons in their valence subshells.

Explanation:

17. The iron metal is oxidized to form the iron oxide known as rust.

19.A saturated solution will not dissolve any more solute and any extra solute added will simply stay as it is, without dissolving. An unsaturated solution has less solute than its solubility and hence can still add more solute, till it reaches the saturation level.

26 An Overflowing Population. The swelling American population played a large part in the decision Americans made to head, The Government Opens Up New Land. The American government itself encouraged its citizens to move west

32. The periodic table was first assembled in 1869 by a Russian chemist named Dmitri Mendeleev. He came up with a way of organizing the elements that were known at the time, arranged them in order of atomic weight, and then grouped them into rows and columns based on their chemical and physical properties. Here is a unique "Mayan" format Periodic Table. Elements in the same group are those that are in a single vertical line from top to bottom. They have the most in common between the two directions. They share the same number of electrons in their valence subshells.

Answer:

1.554442238816872 moles

Explanation:

Answer:

1.5544422388169434  

Explanation:

1 mole is equal to 1 moles Magnesium Chloride, or 95.211 grams.

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Answer: 8.41 g

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]

[tex]\text{Moles of} O_2=\frac{3.29g}{32g/mol}=0.103moles[/tex]

The balanced chemical equation for decomposition is :

[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]  

According to stoichiometry :

As 3 moles of [tex]O_2[/tex] are produced by = 2 moles of [tex]KClO_3[/tex]

Thus 0.103 moles of [tex]O_2[/tex] are produced by =[tex]\frac{2}{3}\times 0.103=0.0687moles[/tex]  of [tex]KClO_3[/tex]

Mass of [tex]KClO_3=moles\times {\text {Molar mass}}=0.0687moles\times 122.5g/mol=8.41g[/tex]

8.41 g was the mass of the original sample.

Answer:

A homogeneous mixture is a mixture in which the components that make up the mixture are uniformly distributed throughout the mixture.

Explanation:

Answer:

c. Fe2+

Explanation:

Coordination compounds comprise solely complex ions together with one or more counter ions. They are compounds in which metal atoms or ions are directly bonded to anions or neutral atoms in conjunction with coordinate covalent bonds.

From the given options, only Fe2+ can form both low-spin and high-spin.

To determine that, we find out the number of unpaired spins in Fe2+

At the ground state:

The electronic configuration is:

Fe: [Ar] 3d⁶ 4s²

After the removal of two electrons, the configuration becomes

Fe²⁺ : [Ar] 3d⁶

A metal ion has the ability to form both low-spin and high-spin complexes if the metal-ion comprises more than 3 and less than 8 d -electrons.

So, since Fe²⁺  contains more than 3 and less than 8. Then Fe²⁺  is the right option.

Ti²⁺ contains only two d electrons

Cu⁺ contains more than eight d electrons

Ni²⁺ contains eight d electrons

Cr³⁺ contains three d electrons

Answer:

The pressure contribution from the heavy particles is 17.5 atm

Explanation:

According to Dalton's law of partial pressures, if there is a mixture of gases which do not react chemically together, then the total pressure exerted by the mixture is the sum of the partial pressures of the individual gases that make up the mixture.

In the simulation:

the pressure of the 50 light particles alone was determined to be 5.9 atm, the pressure of the 150 heavy particles alone was measured to be 17.5 atm,

the total pressure of the mixture of 150 heavy and 50 light particles was measured to be 23.4 atm

Total pressure = partial pressure of Heavy particles + partial pressure of light particles

23.4 atm = partial pressure of Heavy particles + 5.9 atm

Partial pressure of Heavy particles = (23.4 - 5.9) atm

Partial pressure of Heavy particles = 17.5 atm

Therefore, the pressure contribution from the heavy particles is 17.5 atm

Answer:

Cl^-<NO3^-<H2O<F^-<CN^-

Explanation:

When we talk about base strength we are referring to how easily a chemical specie accepts protons.

The greater the ability of a specie to accept H^+, the greater its base strength.

The order of increasing base strengths of the species listed are shown in the answer above.

Answer:

F-

Explanation:

The atomic radius of F is 72 pm and that of F- is 136 pm.

Answer:

b) Nuclear power

Explanation:

The nuclear power plant generated the nuclear energy that utilize the radio active materials like uranium i.e. finite. Thus, this is a non-recyclable.

Also this energy does not release any type of polluting gas neither it is harmful like carbon dioxide or any green house gases So it would be least polluting

Therefore as per the given statement, the option b is the correct one

Answer:

b) Nuclear power

Explanation:

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Answer:

A

Explanation:

Answer:

think it is D

Explanation:

hope this helps

Answer:

2.78 x 10²³

Explanation:

1 mole contains 6.02 x 10²³ hydrogen atoms => 0.46 mole contains 0.46(6.02 x 10²³) hydrogen atoms or 2.78 x 10²³ atoms.

Caution => When to use H vs H₂ => This problem is specific for 'hydrogen atoms' but some may simply say hydrogen. In such cases use H₂ or 'molecular hydrogen' is the focus. it's a matter of semantics, H vs H₂.    

Answer:

d

Combustion

Explanation:

Answer:

The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.

Explanation:

A substance undergoes a change in temperature when it absorbs or gives up heat to the environment around it. However, when a substance changes phase it absorbs or gives up heat without causing a change in temperature. The heat Q that is necessary for a mass m of a certain substance to change phase is equal to:

Q = m*L

where L is called the latent heat of the substance.

In this case:

Replacing:

Q= 2.58 kg* 2260*10³ J/kg

Q= 5,830,800 J = 5,830.8 kJ (Being 1,000 J= 1 kJ)

The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.

The required amount of heat will be "5830 KJ".

Given:

Amount of water,

As we know,

Latent heat of vaporization,

Now,

The amount of heat required will be:

= [tex]m\times L_{vap}[/tex]

= [tex]2.58\times 2260[/tex]

= [tex]5830 \ KJ[/tex]

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