Which concern is the LEAST important when using a compound light microscope to view a sample of paramecia? A) obtaining good resolution B) obtaining sufficient contrast C) recognizing the subject when one sees it D) having sufficient magnification available..........................THE ANSWER IS D....stg

the answer is guyots

Final answer:

The electronegativity difference between selenium (Se) and sulfur (S) is 0.03, indicating a nonpolar covalent bond. Sulfur (S) is slightly more electronegative than selenium (Se).

Explanation:

To determine the electronegativity difference and predict the bond type between selenium (Se) and sulfur (S), we need to look at their individual electronegativities. Typically, Se has an electronegativity of about 2.55 and S has an electronegativity value of about 2.58. To find the electronegativity difference (AEN) for a bond between Se and S, we subtract these values:

[tex]AEN = X_{S} - X_{Se}[/tex]

= 2.58 - 2.55 = 0.03

Since this difference is very small, the Se-S bond would be classified as nonpolar covalent. The more electronegative atom in this pair is sulfur (S), but because the difference is so minor, there would be little to no polarity in the bond, and both atoms would share the bonding electrons approximately equally.

Final answer:

The electronegativity difference between Se and S is 0.03, indicating a nonpolar covalent bond with Sulfur being slightly more electronegative.

Explanation:

The question asks to determine the electronegativity difference and probable bond type, focusing on a bond between Se and S atoms. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. To estimate the character of the bond as ionic or covalent, we can calculate the difference in electronegativity between Se and S. The electronegativity of Se (Selenium) is about 2.55, and the electronegativity of S (Sulfur) is about 2.58. The difference is 2.58 - 2.55 = 0.03.

This small difference indicates that the bond between Se and S would be nonpolar covalent as the difference in electronegativity is very small. Additionally, since Sulfur is slightly more electronegative than Selenium, it would be the more electronegative atom in this bond. For example, a C-H bond with an electronegativity difference of 0.4 is considered nonpolar covalent, showing that the Se-S bond, with an even smaller difference, is also nonpolar covalent.

The organ that absorbs water and vitamin K from digested food is the small intestine.

The small intestine is a long, coiled tube that is located in the abdomen. It is responsible for the absorption of nutrients from digested food. The small intestine is divided into three parts: the duodenum, the jejunum, and the ileum.

The duodenum is the first part of the small intestine. It is about 10 inches long and is located just below the stomach. The duodenum is where most of the digestion of food takes place. The jejunum is the middle part of the small intestine. It is about 8 feet long and is where most of the absorption of nutrients takes place. The ileum is the last part of the small intestine. It is about 12 feet long and is where the remaining nutrients are absorbed.

Water and vitamin K are both absorbed in the small intestine. Water is absorbed throughout the small intestine, but it is absorbed more rapidly in the jejunum. Vitamin K is absorbed in the ileum.

Other nutrients that are absorbed in the small intestine include carbohydrates, proteins, fats, minerals, and vitamins. The small intestine is a very important organ for digestion and absorption of nutrients.

To know more about vitamin K here

https://brainly.com/question/32496536

#SPJ6

You must first convert the supplied value to moles because the molar mass of cadmium is 112.41 grams. Divide 3 grams by the molar mass of 112.41 grams to accomplish that. Consequently, there are 1.601022 cadmium atoms in a 3.00 gram of cadmium.

Using the periodic chart, calculate the element's molar mass. Divide the given mass in grams by the molar mass to get the number of moles.

Multiply the number of moles by Avogadro's number to obtain the total number of atoms.

The amount of units in one mole of any substance is known as Avogadro's number, and it is equal to 6.02214076 1023.

Depending on the substance and the nature of the reaction, the units may be electrons, atoms, ions, or molecules (if any).

Therefore, 3.00g of cadmium contain 1.60×1022 atoms.

Learn more about cadmium here:

https://brainly.com/question/491587

#SPJ2

To find the number of atoms of cadmium in 3.00 grams, divide the mass by the molar mass of cadmium to get moles and then multiply by Avogadro's number. The calculation reveals there are approximately 1.61 x 10²² atoms of Cd in 3.00 grams.

To determine how many atoms of cadmium (Cd) are in 3.00 grams of cadmium, we use Avogadro's number and the molar mass of cadmium. The first step is to find the number of moles of cadmium in 3.00 grams.

Calculate the number of moles of cadmium: Number of moles = mass (in grams) / molar mass (in grams per mole). The molar mass of cadmium is approximately 112.411 g/mol.

Multiply the number of moles by Avogadro's number (6.022 x 10²³ atoms/mol) to obtain the number of atoms.

Here's the calculation:

Number of moles = 3.00 g / 112.411 g/mol = 0.0267 mol

Number of atoms = 0.0267 mol x 6.022 x 10²³ atoms/mol = 1.61 x 10²² atoms of Cd

Answer:

Chemical change

Explanation:

A chemical change is a change that cannot be reversed. It results in the formation of a new product. For example, the combustion of wood gives carbon dioxide and water and sometimes suit. In other words, in a chemical change, the products are always different from the reactants. The following equation generally governs a chemical change:

[tex]Reactants = Products (solid, liquid, or gas)[/tex]

Answer is: Yes it is balanced. It has the same number of Ca and O on both the reactant side and the product side.

According to principle of mass conservation, number of atoms must be equal on both side of chemical reaction.

There is one calcium atom atom and one oxygen atom on both side of reaction, so chemical reaction is balanced.

Answer:

Valence Electrons is the answer.

Explanation:

Valence electrons are the outermost shell of electrons in an atom. The valence electrons determine the reactivity to chemical reactions an atom has. This is because those with the same number of valence electrons have similar chemical properties. It is also why elements with the same number of valence electrons are put in the same group on the periodic table.

The reactivity of an atom is determined by the number of valence electrons it has.

Valence electrons are the electrons found in the outermost energy level of an atom. These little particles called electrons are very important in how chemicals react and stick together.

Atoms with not enough electrons in their outermost shell (called valence shell) are more likely to react with other atoms. These tiny particles called atoms want to gain, lose, or share electrons so that they can have a stable arrangement with complete outer shells.

Read more about  reactivity  here:

https://brainly.com/question/11231920

#SPJ6

The correct answer is option (d). The most accurate description of metals are good conductors of electricity.

Metals are generally known for their ability to conduct electricity efficiently. This is due to the presence of free electrons in their structure, which can move easily through the metal, carrying electrical current.

The type of elements that have many valence electrons and are not good conductors are called nonmetals. They are known for their hard and brittle nature with high to very high melting points. While they can conduct electricity as a liquid, in solid state they are poor conductors.

The elements referred to in the question are called nonmetals. These elements, which are often found on the right side of the periodic table, have many valence electrons and are poor conductors of electricity. Some examples of nonmetals include nitrogen, oxygen, and the noble gases.

Nonmetals have various physical and chemical properties that distinguish them from metals. For instance, they are usually hard and brittle, and can conduct electricity as a liquid but not as a solid. Additionally, nonmetals have high to very high melting points. All these features are due to their electrons being more tightly bound to their nuclei than in metals.

Another category closely related to nonmetals are the metalloids, like boron, silicon, germanium, arsenic, antimony, and tellurium. These elements exhibit properties of both metals and nonmetals. Although they may appear metallic, they do not conduct electricity as well as metals and hence can be considered as semiconductors. Their chemical behavior also falls between that of metals and nonmetals.

https://brainly.com/question/20114909

#SPJ2

The reason the metals are malleable, is because they have mobile electrons in their s orbitals.

The ions create a lattice-like structure held together by the metallic connections. Metallic bonds are what allow metals to flex without breaking and conduct electricity.

Chemical bonds known as metallic bonds are produced by the electrostatic attraction of positively charged metal ions and conduction electrons. The sharing of free electrons among a structure of positively charged ions could be used to characterize it.

Metal atoms form metallic connections. Ionic bonds link metals to non-metals, whereas metallic bonds link many metal atoms. Metallic bonding can be observed in action on copper wires and sheets of aluminum foil.

When the charge is dispersed over a broader area than the size of a single atom in a solid, metallic bonds are created. Most left-handed elements in the periodic table form metallic bonds.

Thus, Metallic bonds are what allow metals to flex without breaking and conduct electricity.

To learn more about metallic bond, follow the link;

https://brainly.com/question/16026653

#SPJ6

Growth is a permanent and Irreversible increase in the size of a living organism. In Living organisms, growth is from Inside. Where as in Non-living objects like Mountains and sand mounds, growth occurs by accumulation on of material on the outer surface.

Growth is the increase in mass and size of a body or organs which typically occurs by the multiplication of cells and an increase in intracellular substance.

Development means the physiological and functional maturation of the organism.

Living organisms undergoes growth from Inside. Where as Non-living objects like Mountains and sand mounds undergo growth by accumulation on or of material on the outer surface.

Therefore, Growth is a permanent and Irreversible increase in the size of a living organism.Where as in Non-living objects like Mountains and sand mounds, growth occurs by accumulation on of material on the outer surface.

Learn more about Growth here ;

https://brainly.com/question/16465256

#SPJ2

Answer:

Barium

Got this on a test and got it right! :)

Answer: D. experimental bias

Explanation:

An experimental bias is the condition in which the experimenter manipulate the experimental procedure, equipment and even the results so as to obtain the desired outcome.

The given situation is an example of experimental bias this is because of the fact that field A was supplied with old fertilizers and brand new irrigation system but field B was supplied with new fertilizers and irrigation system which will be repaired in next season. Hence, a experimental bias is done so as to show that the old fertilizer is better than the new one.    

An example of a physical change is grinding pepper. Physical change is when there is no change in the chemical composition of the substance.

Physical changes are those changes in which the physical composition of the substance changes but the chemical composition of the substance or compound remains the same.

Examples are ice melting into water. It is a physical change. Like here, the baking cake is a chemical change in which the substance changes into other substances.

And grill lighting is a chemical change. Toasting bread is a chemical change in which the bread substance is burning. Pepper grinding is a process of physical change because it's just crushing the pepper.

Therefore, an example of physical change is grinding pepper.

To learn more about physical changes, refer to the link:

https://brainly.com/question/20567290

#SPJ5

Geologists use index fossils for dating of rock layers

Geologists use index fossils to determine the age of rocks. Index fossils are also known as key fossils; they define dating of rock layers.

Some of the characteristics of fossil index include:

Index fossils are defined as “commonly found” because they are widespread but limited in a period of time. If an index fossil is found in a particular layer, the layer will determine the age of the layer, therefore with the use of index fossils, one can easily define the geological periods. In many cases, the geological periods can last as far as tens of millions of years.

Index fossils have a very short life span, therefore the age at which they are found defines their age. They are used to determine the period and eras of the geological time scale.

Geological time scale is also known as GTS, it refers to a system of dating which relates stratigraphy to time. Geological time scale is used by Geologists to determine the period and the relationship of events that have taken place in the history of the earth.

Therefore, Geologists use index fossils for dating of rock layers

LEARN MORE:

KEYWORDS:

Geologists use index fossils for dating rock layers. The correct answer is option A.

An index fossil is a fossil that is known to have lived during a specific geologic time period. By identifying the index fossils in a rock layer, geologists can determine the age of the rock layer.

Index fossils are used because they are widespread, abundant, and have a short geologic range. This means that they are found in many different locations, are common in the fossil record, and only existed for a relatively short period of time.

In conclusion, to date rock layers, geologist use index fossil.Option A is the correct answer.

Learn more about index fossil here:

https://brainly.com/question/2495177

#SPJ6

Answer: false

Explanation:

I got it right

When an article is in motion then the measure of energy stored in it is called kinetic energy.

       [tex]\text{Kinetic}\; \text{Energy} &= \dfrac{1}{2}\; \text{mv}^{2}[/tex]

       where, m = mass of the article in kg

       v = velocity in  [tex]\dfrac{\text{meter}}{\text{seconds}}[/tex]

Therefore, the kinetic energy is directly proportional to the temperature.

To learn more about kinetic energy and temperature follow the link:

https://brainly.com/question/16946733

Mendeleev organized his Periodic Table by increasing atomic mass in the same way that today's Periodic Table is organized by atomic number.

A periodic table, also known as an elemental periodic table, is a tabular representation of the chemical elements.

It is widely used in chemistry, physics, and other sciences, and is widely regarded as a chemistry icon.

Mendeleev positioned elements in rows in his periodic table by increasing atomic mass.

Elements with lower atomic masses were located on the left within a row.

Every time the chemical characteristics of the elements repeated, Mendeleev began a new row. As a result, all of the elements in a column shared the same properties.

Because of the arrangement of the elements, it is known as the periodic table.

Thus, the he arranged it by increasing atomic mass.

For more details regarding periodic table, visit:

https://brainly.com/question/11155928

#SPJ2

Final answer:

Dmitri Mendeleev organized the original Periodic Table by atomic mass and predicted undiscovered elements by leaving gaps for them, differing from the modern table's organization by atomic number.

Explanation:

The Russian chemist Dmitri Mendeleev organized his Periodic Table by atomic mass, unlike the modern Periodic Table which is organized by atomic number. He encountered a challenge where he had to list some elements out of order of their atomic masses to align them with others of similar chemical properties. Mendeleev was developing a chemistry textbook for his students and needed a logical way to present the known elements.

During this process, Mendeleev left gaps in his Periodic Table to maintain the grouping of chemically similar elements, predicting the existence of undiscovered elements that would fit into these gaps. These gaps provided the periodic table with a predictive value which was validated when elements like gallium, scandium, and germanium were discovered with properties closely matching his predictions.

The presence of a volatile impurity would cause the calculated mass of anhydrous salt to be too low, as the impurity would evaporate along with water, leading to an overestimation of the mass of water lost.

If a sample contains a volatile impurity, the value that would be in error is the mass of the anhydrous salt. When heating a hydrated salt to drive off water and obtain the mass of the anhydrous salt, the presence of a volatile impurity means that along with the water, the impurity could also evaporate. This would lead to a recorded mass that is less than the actual mass of the anhydrous salt. So, the calculated mass of anhydrous salt would be too low, and conversely, the mass of water recorded would be too high because the loss of mass of the volatile impurity would be erroneously attributed to the water mass.

https://brainly.com/question/31604671

#SPJ3