How long must bleach stay wet on a surface in order to perform disinfection?

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Which reactants would lead to a spontaneous reaction? Mn2+ and Al
Mn and Al3+
Al and Mn
Mn2+ and Al3+

Answers

The reactants that would lead to a spontaneous reaction are Mn2+ and Al3+. Al and Mn are not because they are stable reactants. Mn and Al3+ are not because Mn is stable. Mn2+ and Al are not because Al is stable.

Answer:

ITS B

Explanation:

I took the test on edge

The distance between two points on a map is 0.704 kilometers. What is the distance in meters?

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The distance of 0.704 kilometers is equivalent to 704 meters when converted, using the conversion factor that 1 kilometer equals to 1000 meters.

To convert the distance from kilometers to meters, we utilize the known fact that 1 kilometer is equivalent to 1000 meters. Thus, to get the equivalent of 0.704 kilometers to meters, simply multiply the given distance by 1000.

So, 0.704 kilometers * 1000 = 704 meters.

This means that this particular distance or length is the same as 704 meters when converted to meters from kilometers.

Learn more about Distance here:

brainly.com/question/30195443

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704 meters is the answer

Which of the following pairs share the same empirical formula? Select one:
a. CH4 and C2H4
b. PbCl2 and PbCl4
c. N2O5 and NO2
d. C2H6 and C4H12

Answers

Answer: The correct option is d.

Explanation: Empirical formula is a chemical formula which has the simplest ratio of elements present in a chemical compound.

From the given following pairs, the pair which shares the same empirical formula is $C_2H_6\text{ and }C_4H_(12)$

Empirical formula of $C_2H_6$ is $CH_3$ (by dividing the coefficients of $C_2H_6$ by 3)

Empirical formula of $C_4H_(12)$ is $CH_3$ (by dividing the coefficients of $C_4H_(12)$ by 3)

Both the chemical formulas have same empirical formula. Hence, the correct option is d.

C2H6 and C4H12 share the same emperical formula of CH3 as the both compounds can be reduced by the smallest subscript in each compound. So C2H6 will be reduced by 2 making CH3 and C4H12 can be reduced by 4 making CH3

Which explanation best compares the movement of particles in three states of matter?

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The three states of matter are solid, liquid and gas phase. The solid has a more definite shape and volume. The particles are locked into place. It cannot be further compressed due to the bond that exists between the molecules. The kinetic energy of the molecules is close to none because the molecules are so close and so compact with each other. For liquids, it has a medium shape and volume. The particles can move or slide past each other due to the small space available for movement. It cannot be compressed further due to the repulsive forces that acts between them. The kinetic energy is medium. For gases, it has no shape and volume because the particles can move freely from one other. Their collisions are rare due to the distance between them. The kinetic energy of the molecules is high because there is room for movement. It can be compressed easily.

An acid-base indicator is used in what type of reaction?

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Acid - base indicators (also known as pH indicators) are substances which change color with pH. They are usually weak acids or bases. you use them if you want to know if a solution is an acid or it it's a base

37 Which general trends in first ionization energy and electronegativity values are demonstrated by Group 15 elements as they are considered in order from top to bottom?(1) The first ionization energy decreases and the electronegativity decreases.(2) The first ionization energy increases and the electronegativity increases.
(3) The first ionization energy decreases and the electronegativity increases.
(4) The first ionization energy increases and the electronegativity decreases.

Answers

Correct answer: The first ionization energy decreases and the electronegativity decreases.

Reason:
As we move from top to bottom in a periodic table, atomic radius increases. Also, effective nuclear charge decreases. Due to this, energy required to remove the electron form valance shell decreases. Hence, ionization energy decreases from top to bottom.

In addition to this, metallic character increases from top to bottom. Metals have low electronegativity as compared to non-metals. Hence, electronegativilty value decreases from top to bottom.

The correct statement regarding the first ionization energy and electronegativity values in group 15 is as follows:

$\boxed{\left( 1 \right){\text{ The first ionization energy decreases and the electronegativity decreases}}}$

Further Explanation:

The amount of energy needed for the removal of the most loosely bound electron from a neutral isolated gaseous atom is termed as ionization energy, represented by IE. It depends on the ease of electron removal from the neutral atoms. If the electrons are removed easily, ionization energy will be less and vice-versa.

Ionization energy is called the first ionization energy when the first electron is removed from the atom. It is shown by $\left( {{\text{I}}{{\text{E}}_{\text{1}}}} \right)$ . Similarly, if the second electron is removed, ionization energy becomes the second ionization energy $\left( {{\text{I}}{{\text{E}}_{\text{2}}}} \right)$ .

The tendency of any element for electron attraction towards itself in a chemical bond is known as electronegativity. More the attracting tendency of the atom for electron, higher will be its electronegativity and vice-versa.

Atomic number and number of shells increase while going down group 15. Due to this, atomic size increases in the group from top to bottom. This increase in size results in weaker attractions between the outermost electrons and the atomic nucleus. So electrons are removed easily and therefore the first ionization energy decreases down this group.

Since atomic size increases from top to bottom of group 15, the attraction between the atomic nucleus and the electrons decreases. Therefore electronegativity also decreases down this group.

Therefore both the first ionization energy and electronegativity decrease down group 15.

Learn more:

Rank the elements according to first ionization energy: brainly.com/question/1550767
Arrange the following elements from greatest to least tendency to accept an electron: brainly.com/question/2107660

Answer details:

Grade: Senior School

Chapter: Periodic classification of elements

Subject: Chemistry

Keywords: ionization energy, first ionization energy, electronegativity, attraction, group 15, decrease.

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