CHEMISTRY MIDDLE SCHOOL

What are the sides of the DNA ladder made of?

Answers

Answer 1
Answer: The sides of a DNA ladder are made by bio-polymers which have a more complicated name, polynucleotides. Polynucleotides are made of nucleotides and each of those is made of one of these components. Guanine, Adenine, Thymine, and Cytosine. There is also a base pairing rule. G combines with A, and T combines with C.
Answer 2
Answer:

The sides of the DNA ladder are made of alternating deoxyribose sugar molecules and phosphate groups.

The DNA molecule has a double helix structure, resembling a twisted ladder. The sides, or rails, of this ladder are composed of two long chains of nucleotides running in opposite directions. Each nucleotide consists of three components: a deoxyribose sugar molecule, a phosphate group, and a nitrogenous base (adenine, thymine, cytosine, or guanine). The deoxyribose sugar molecules and phosphate groups alternate to form the backbone of the DNA strand. The phosphate groups link the sugar molecules together through covalent bonds, creating a strong and stable structure.

The nitrogenous bases, which include adenine (A), thymine (T), cytosine (C), and guanine (G), project inward from the sugar-phosphate backbone and form complementary base pairs (A with T and C with G) between the two DNA strands. These base pairs are held together by hydrogen bonds, which provide the specificity and complementarity necessary for DNA replication and information storage. This elegant molecular architecture allows DNA to store and transmit genetic information accurately.

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Can someone explain #3

Answers

Answer:

Explanation:

Hey,

so here the student is saying that the given mass is of one atom. But when we usually talk about amu it is the unified atomic mass so mass of all the atoms present.

So that's why he is wrong.

Also the definitions states,

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.

Answer:

See below.

Explanation:

121.76 amu is the Relative Atomic Mass of Antimony (the average mass of the different isotopes). . The element exists as a mixture of isotopes ,  the main one being  SB121 which has a mass of 121.

How many grams of k2so4 would you need to prepare 1500 g of 5.0% k2so4 solution?

Answers

Data Given:
                                  % w/w  =  5 %

                    Solution weight  =  1500 g

                       Solute weight  =  ?

Formula Used:
                            % w/w  =  (Mass of Solute / Mass of Solution) × 100

Solving for Mass of Solute,
         
                       Mass of Solute  =  (% w/w × Mass of Solution) ÷ 100

                       Mass of Solute  =  (5 × 1500 g) ÷ 100

                       Mass of Solute  =  75 g K₂SO₄

What quantity of aluminium is deposited when a current of 10A is passed through a solution of aluminium salt for 1930s? (All=27,F=96500cmol)​

Answers

The amount of aluminum deposited when a current of 10A is passed through a solution of aluminum salt for 1930s is 5.4 g.

What is electrochemical cell ?

An electrochemical cell converts chemical energy into electrical energy. Metals with higher negative electrode potential undergo oxidation and its ionization produces electron flow through the solution.

The weight of the metal that deposited by reduction is related to the mass of metal, current passed and time as follows:

w = z It

where z = E/96500 F

Equivalent mass of Al, E = 27 g

t = 1930 s

current I = 10 A.

Now, the weight of aluminum metal deposited is calculated as follows:

w = 1930 s × 10 A × 27/96500 = 5.4 g.

Therefore, the weight of Al deposited on the electrode is 5.4 g.

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Answer:

AL*3+ + 3e- =AL.

（10A×1930）÷96500=0.2mole e-

0.2÷3×27=1.8g（AL）

Name the 5 types of chemical reactions

Answers

There are way more than 5 but I will list the ones I know:

Reaction with acid

Reaction with water

Combustion/Flammability

Combination

Redox

Isomerization

Example when materials are prepared as fluids so they can be moved more easily

Answers

A simple, albeit slightly less useful example perhaps, is when a foundry, or individual metalworker, liquefies metal such as iron, aluminum, or steel so that it can be mixed in with specific forging agents or transferred around a workplace. 

In general solids are easier to transport than liquids, but the above metal example is a valid one and the only other one that comes to mind is that of concrete. It is mixed as a liquid and transported as such, but then sprayed or laid down to dry and form a solid surface or filler.  
A simple, albeit slightly less useful example perhaps, is when a foundry, or individual metalworker, liquefies metal such as iron, aluminium, or steel so that it can be mixed in with specific forging agents or transferred around a workplace. 
In general, solids are easier to transport than liquids, but the above metal example is a valid one and the only other one that comes to mind is that of concrete. It is mixed as a liquid and transported as such, but then sprayed or laid down to dry and form a solid surface or filler.  
Explanation:

Both gases and liquids are fluids, therefore technically, the gas to liquid stuff does not work. 

In addition to the LN2 and LO2 the opposite guys mention, organic compound gases also are oftentimes created into liquids. LPG is of a composition that it liquefies at low pressures. LNG is gas that's terribly cold in order that it becomes a liquid in order that tons are shipped during a tanker. 

Industrial users additionally build solids into liquids for transport in pipelines. as an example, coal slurries area unit typically used. Coal is ground up into the mud, and mixed with water, and may then be pumped up through pipelines. There are different sorts of slurries, like wood chips/water in paper mills, sand/water mixture in dredging machines.

How does a magnet separate mixtures?

Answers

It can only do that when  one of the components of the mixture is a magnetic
material.

When you have that situation, you pass the magnet over the mixture ... shaking
the mixture if it's a dry mixture of powders or pieces ... and the magnetic part of
the mixture moves toward the magnet, while the nonmagnetic parts of the mixture
couldn't care less about the magnet and they just stay where they are.
It will separate when one of the elements found in the mixture is magnetic. This process can't be done in a compound as a compound is chemically bonded!
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