In which type of mirror do you see the most realistic virtual image
Plane
Convex
Concave
Duplex

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

Explanation:non>

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:

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: 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:

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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Answer:

boron, aluminum, and gallium

Explanation:

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

Answer:

Explanation:

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Answer:

when atom is neutral it has a no charge, looses electron has positive charge, gains electron gets negative charge

Explanation:

protons  have positive charges (+)

electrons have negative charges (-)

when an atom is neutral is means no additional electron is lost or gain

When an atom has a neutral charge it has neither too much or too little electrons  since it has not gained or lost any thus the zero charge ( no charge)

When an atom loses an electron since its losing an electron that has a negative charge it becomes a bit more positive so thus the positive charge

When the atom gains an electron it gains a bit more negativity then it had so its going to have a negative charge

Answer: 0-14

Explanation: Hope this helps

Answer:

52 g H2O (to 2 significant figures)

Explanation:

I hope you like my answer:)

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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:

took the test :)

Answer:

C.

Explanation:

para sakin letter C ganonn

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:

A

Explanation:

Answer:

think it is D

Explanation:

hope this helps

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:

Villi

Explanation:

Villi are folds on the small intestine lining that increase the surface area to facilitate the absorption of nutrients.

The modification of the small intestinal wall that serves to increase surface area is called the microvilli.

Along the length of your small intestine, there are minute, finger-like extensions called intestinal villi comprised of cells.

Here,

Villi are projections that are finger-like and are densely populated with blood vessels. They are found in the inner lining of the small intestine and aid in nutrient absorption by expanding the surface area for absorption.

When we consume food, nutrients are taken up by our villi, which subsequently transport them into our bloodstream to be transported to where they are needed.

Digestive enzymes are present in the microvilli, which aid in the breakdown of proteins and carbohydrates. Villi aid in nutrient absorption in this manner.

Hence,

The modification of the small intestinal wall that serves to increase surface area is called the microvilli.

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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

The magnitude of k at 65.0∘C : 1912.7 /s

Given

k at 25 °C = 1.35 x 10² /s k1

T₁=25 + 273 = 298 K

T₂=65 + 273 = 338 K

Required

the magnitude of k at 65.0∘C

Solution

Arrhenius Equation :

[tex]\tt ln(\dfrac{k_1}{k_2})=(\dfrac{1}{T_2}-\dfrac{1}{T_1})\dfrac{Ea}{R}[/tex]

R : gas constant= 8.314 J/molK

Input the value :

[tex]\tt ln(\dfrac{1.35\times 10^2}{k_2})=(\dfrac{1}{338}-\dfrac{1}{298})\dfrac{55.5.10^3}{8.314}\\\\ln(\dfrac{135}{k_2})=-2.651\rightarrow \dfrac{135}{k_2}=e^{-2.651}\rightarrow k_2=1912.7[/tex]

Temperature,

Rate constant,

Gas constant,

By using the Arrhenius equation, we get

→ [tex]ln (\frac{k_1}{k_2} ) = (\frac{1}{T_2} - \frac{1}{T_1} )\frac{Ea}{R}[/tex]

By substituting the values, we get

→ [tex]ln (\frac{1.35\times 10^2}{k_2} ) = (\frac{1}{338} - \frac{1}{298} )\frac{55.5\times 10^3}{8.314}[/tex]

→        [tex]ln (\frac{135}{k_2} ) = -2.651[/tex]

                [tex]\frac{135}{k_2} = e^{-2.651}[/tex]

                 [tex]k_2 = 1912.7[/tex]

Thus the response above is right.

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Answer:

3.0585147719047385 is the answer

Answer:

it is turned into kinetic energy

Explanation:

Answer:

Kinetic energy is transferred from the leg to the soccer ball. or C

Explanation:

Hope this helps

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:

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:

Using the sprayer on your sink if you have one

Explanation:

If a chemical gets into your eye, you will need to flush the eye thoroughly with water in order to get the chemical out of the eye before it causes any kind of damage to the eye.

This could normally be done in an eye wash station. However in the absence of an eye wash station, one could use the sprayer of the sink if he/she has one. This will deliver water to completely flush the eye at lower pressure.

Answer:

Mass = 108 g

Explanation:

Given data:

Mass of water produced = ?

Number of moles of hydrogen = 6.00 mol

Solution:

Chemical equation:

2H₂ + O₂     →     2H₂O

Now we will compare the moles of hydrogen with water.

                H₂             :              H₂O

                  2             :               2

                  6             :             6

Mass of water:

Mass = number of moles × molar mass

Mass = 6 mol × 18 g/mol

Mass = 108 g

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:

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:

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