Which is a pure substance? A. sugar B. trail mix C. leaf salad D. sugar water

Answer:

Your answer is Mg(NO3)2, in water Mg(NO3)2(aq) → Mg2+(aq) + 2NO3-(aq)

Explanation:

Answer:

The lower the pressure the lower the temperature, thus, at 3000 m the pressure is lower, therefore the boiling temperature is lower than at 0 m.

Explanation:

Hello,

In this case, the boiling point of water at the sea level is about 100 °C whereas at 3000 m is about 89.5 °C since the pressure at higher altitudes is less than the atmospheric pressure. In such a way, considering a directly proportional relationship between pressure and temperature, the higher the pressure the higher temperature (sea level) whereas the lower the pressure the lower the temperature (at 3000 m)

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The atoms with the most negative electron affinity are usually nonmetals, especially halogens. They have a strong desire to gain electrons to fulfill their valence shells, making them more stable. For example, Fluorine has the highest electron affinity.

Generally, atoms with the most negative electron affinity are commonly nonmetals, specifically halogens. Electron affinity is a measure of how much an atom wants to accept an electron. A more negative value represents a stronger desire to gain electrons. This eagerness to attract electrons arises primarily because these atoms are only one electron short of filling their valence shells, which makes them more stable. For instance, the halogen Fluorine has the most negative electron affinity, as it greedily accepts electrons to complete its valence shell and achieve a stable noble gas configuration.

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Answer:

The root will turn 90 degrees downward, and the stem will curl 90 degrees upwards.

Explanation:

Answer:

The root will curl down, and the stem will curl up.

this is for exabit A

Answer: Outermost orbitals

Explanation:

It is known that at if a gas is identified to be as ideal gas then, at STP, the volume of 1 mole of that gas is equal to 22.4 L. Using this fact and the given volume in this item, we determine the number of moles as that below.

                n = (11.2 L of argon)(1 mol argon / 22.4 L of argon)

                 n = 0.5 moles

Answer: 0.5 moles 

The electron configuration that represents the electrons in an atom of chlorine in an excited state is 2-8-7. Option 3.

The usual electron configuration for chlorine is 2-8-7. In an excited state, an electron can be temporarily promoted to a higher energy level. For chlorine in an excited state, one electron from the 3rd energy level (7) is elevated to a higher level, leading to the configuration 2-8-7.

This excited electron configuration indicates a temporary alteration in the arrangement of electrons, reflecting the absorption of energy. Once the excitation ceases, the electron returns to its original energy level, and the atom reverts to its ground state configuration (2-8-7).

Which electron configuration represents the electrons in an atom of chlorine in an excited state?

(1) 2-7-7 (3) 2-8-7

(2) 2-7-8 (4) 2-8-8

Answer: Bio-fuels

Explanation:

Bio-fuels are the alternatives of fossil fuels and are directly or indirectly obtained from the plants and other waste materials that are of biological origin. It is much cheaper than the fossil fuels.

The above mentioned crops, algae sugar and other sewage products produces ethanol, undergoing fermentation process, that are essential for making bio-fuels.

Bio-diesel and Bio-ethanol are the two usual types of bio-fuels. Bio-diesels are made up of fats and oils, commonly used to run vehicles whereas bio-ethanol is made from the fermentation of plants and other crops, that are enriched in the production of ethanol.

Answer: Option (d) is the correct answer.

Explanation:

Resistance is defined as the ability of a substance to resist the slow of electrons or charges through it.

This means that a resistance is the measure to see how difficultly a charge is flowing through a material. Resistance is represented by R and it's S.I unit is ohms.

According to ohms law, electric current is proportional to voltage and inversely proportional to resistance.

Mathematically,     V = IR

where,    V = voltage

               I = current

               R = resistance

Thus, we can conclude that the statement ability of a material to repel neutral charges and is measured in ohms, best describes resistance.

1-2: Metals non-metal.

13-18: Metalloids, Non-Metals, Metals 

Columns 1, 2, and 13-18 on the periodic table are main-group elements, with column 1 containing alkali metals, column 2 containing alkaline Earth metals, and columns 13-18 including groups such as pnictogens, chalcogens, halogens, and noble gases.

Columns 1, 2, and 13-18 on the periodic table represent main-group elements, which are also known as representative elements. The elements in these columns have distinct properties and are usually presented in a way that highlights the similarities within a group.

Elements in column 1, except for hydrogen, are known as the alkali metals. They typically form compounds that consist of one atom of the element and one atom of hydrogen, and they share similar chemical properties.

Column 2 contains the alkaline earth metals. These elements form compounds with two atoms of hydrogen and exhibit comparable properties among themselves.

Columns 13 to 18 include various other families of elements with distinct properties, such as the pnictogens (group 15), chalcogens (group 16), halogens (group 17), and the noble gases (group 18, also known as inert gases).

The elements in these groups also tend to form compounds that reflect their column's valence electron configurations, illustrating the periodic nature of the table in which elements with similar chemical properties appear in vertical columns or groups.