The symbol Na represents a sodium atom that has lost an electron. True False

Answers

Answer 1

Answer: False.
Na does represent sodium, but NOT when it lost an electron. Na+ represents sdoium when it lost its electron.

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What determines the order of placement of the elements on the modern Periodic Table?(1) atomic number(2) atomic mass(3) the number of neutrons, only(4) the number of neutrons and protons

Answers

The order of placement of the elements on the modern Periodic Table is determined by their atomic number (option A)

What is atomic number?

The atomic number of an element is the number of protons in the nucleus of an atom of that element. It is a unique identifier for each element, and it is the primary factor that determines the chemical properties of an element.

The Periodic Table is arranged in horizontal rows, called periods, and vertical columns, called groups. The order of placement of the elements on the modern Periodic Table is determined by their atomic number.

Learn about atomic number here brainly.com/question/11353462

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The order of placement of the elements on the modern Periodic Table is the atomic number. The answer is number 1. The rest of the choices do not answer the question above. Atomic mass gives the number of mass of an atom.

Is crumpling a sheet of paper a physical or chemical change? Why?

Answers

I believe it is a physical change. Crumpling a sheet of paper does not change any properties of the paper and it does not form a new substance it must be a physical change. It is only the shape or form of the paper that is being changed. Hope this answers the question.

It's a physical change. You're not changing the chemical make up of the piece of paper. Only the appearance.

What does the symbol 2CO represent in the model below? 2CO + o^2 -> 2CO2

Answers

Answer: a reactant

Explanation: online physics class

Answer:2CO (g) + O2 (g) 2CO2 (g)This Equation Means That No Matter How Much Carbon Monoxide And Oxygen ... Question: 2CO (g) + O2 (g) 2CO2 (g)This Equation Means That No Matter How Much Carbon Monoxide And Oxygen Gas Is Added To The Flask, Only 2 Moles Of CO And 1 Mole Of O2 Will React To Make Two Moles Of Co2.What Is Wrong With This Statement?

Explanation:

Which best describes the function of a centrifuge?to separate the solute from the solvent
to separate the dissolved part of a solution into layers
to separate a mixture by heating it for a long period of time
to separate the undissolved particles of a mixture into layers

Answers

The correct answer is the last statement. Centrifugation is to separate the undissolved particles of a mixture into layers. It separates a homogeneous mixture by spinning it at high speeds. The precipitate settles at the bottom while the solution is clear.

The correct answer is the last answer choice

Why is cellulose so difficult for most animals to digest? A)           they don’t have the proper enzyme to break the bonds between subunits
                B)            cellulose is made up of chitin, which is indigestible
                C)            the bonds holding cellulose subunits together are extremely strong, stronger than in any other macromolecule
                D)           there are many hydrogen bonds holding the subunits together

Answers

The answer is C .Cellulose is a long chain of glucose and to be able to use any of the energy stored in them an organism must break it down into single glucose molecules, and this is why most animals go for a different diet. The chain is very difficult to break down and must be treated with concentrated acids at high temperature. This is a hard task to do and often time needs many stomachs.

Cellulose is so difficult for most animals to digest because they don’t have the proper enzyme to break the bonds between subunits.

Further explanation

Cellulose

It is a polysaccharide compound which is difficult to be digested by animals because they don’t have the enzyme needed to break it. It has many monosaccharide molecules bind together by glycosidic bond.

Glycosidic bond

It is a covalent bond. It is formed between two monosaccharide with the removal of one water molecule. It is of two types, Alpha (between C-1 of one monosaccharide and C-2 of other monosaccharide) and beta (also between the C-1 of one monosaccharide and C-2 of another monosaccharide). Enzymes are required for breakdown of cellulose. In our body various enzymes are present for the breakdown of carbohydrates but these enzymes can never digest cellulose. Our enzymes are unable to break beta glycosidic bond but they can break the alpha glycosidic bond. A bond is present in glycogen and starch so these can be digested by human beings. It is thought that such enzymes are produced by vermiform appendix. In herbivores the enzymes which are required for the breakdown of cellulose are present in their digestive tracts so they can digest cellulose.

Animal which can digest cellulose

Grazing animals like cattle can digest cellulose because they have symbiotic bacteria in their intestine and these bacteria hep them in digestion because of special enzymes in them.

Answer details

Subject: Chemistry

Level: High school

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