Integrated Science Students Association of Nigeria. - ISSAN

▶️Oxidation

▶️Reduction

▶️Distillation

▶️Thermal Decomposition

▶️Titration

Topic: ALKYL HALIDES (Haloalkanes) – 2,2-Dibromobutane

INTRODUCTION

2,2-Dibromobutane is a type of haloalkane. It is made by replacing two hydrogen atoms on the second carbon of butane with two bromine atoms.

STRUCTURE

Name meaning:

Butane = 4 carbon atoms in a chain.

2,2-dibromo = two bromine (Br) atoms on the second carbon.

Structure:

Br
|
CH3 – C – CH2 – CH3
|
Br

Condensed formula: CH3CBr2CH2CH3

PHYSICAL PROPERTIES

Molecular weight: About 216 g/mol (heavy due to bromine).

Appearance: Colorless to pale yellow liquid.

Density: Heavier than water.

Boiling point: About 145°C (high because of strong forces between molecules).

Melting point: Around -26°C.

SOLUBILITY:

Not very soluble in water.

Soluble in organic liquids like ether or chloroform.

Flammable: Can catch fire at about 26°C.

CHEMICAL PROPERTIES

The C–Br bonds are reactive and make the molecule useful in chemical reactions.

Substitution reactions: Bromine atoms can be replaced by other atoms.

Elimination reactions: Can lose both Br atoms to form double or triple bonds (alkenes or alkynes).

Sensitive: Can break down in light or air.

USES

Used in making other chemicals in laboratories and industries.

Helps in research and the creation of medicines or agricultural chemicals.

SAFETY

Harmful: Can irritate the skin, eyes, and lungs.

Flammable: Keep away from fire.

Environmental hazard: Must be disposed of properly.

CONCLUSION

2,2-Dibromobutane is a useful haloalkane with two bromine atoms on one carbon. It has special physical and chemical properties that make it important in organic chemistry.

PSYCHOLOGY;

MASLOW'S HIERARCHY OF NEEDS.

Maslow's hierarchy of needs is a theory in psychology that proposes that human motivation is driven by five innate needs, arranged in a pyramid structure. These needs, from basic to most complex, are:

● Physiological needs:
These are the biological requirements for human survival, including food, water, shelter, sleep, and oxygen.

● Safety needs:
The need to feel safe and secure in your environment, including protection from physical and emotional harm.

● Love and belonging needs:
The need for social connection, intimacy, and love.

● Esteem needs:
The need for self-esteem, confidence, achievement, recognition, and respect from others.

● Self-actualization needs:
The desire to fulfill your full potential and become the best version of yourself.

According to Maslow, as each level of need is met, the next level becomes the driving force for motivation. However, this is not a rigid hierarchy, and people may move up and down the pyramid depending on their circumstances.

✍️ ✍️ ✍️ Adam Muh'd Sani

PSYCHOLOGY

CHARACTER ASSASSINATION
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Character assassination in psychology refers to the deliberate and sustained effort to damage someone's reputation or credibility. It's a tactic used to manipulate how others perceive the target, often through dishonesty and underhanded means.

Here's a breakdown of key aspects:

1. Motivation: It's often used by people with insecurities, a need for power, or even personality disorders like narcissism.
2. Methods: Perpetrators employ various tactics, including:
3. Spreading rumors and misinformation (often with a mix of truth and lies for believability).
4. Exaggerating or twisting facts to paint a negative picture.
5. Isolating the target by gossiping to others and creating distance.
6. Projecting their own flaws onto the target by accusing them of bad behavior they themselves exhibit.
7. Impact: Character assassination can have serious consequences for the target, damaging their social standing, professional opportunities, and even self-esteem.

Here are some additional points to consider:

● It's a common tactic in toxic relationships, family dynamics, and even competitive environments.
● Psychologists often explore the underlying reasons behind character assassination to understand the manipulator's motivations and the target's vulnerabilities.

■ HOW TO COPE WITH THE SITUATION OF CHARACTER ASSASSINATION

Character assassination attempt might be difficult, but there are steps you can take to address the situation and minimize the damage:

1. Stay Calm and Assess: Reacting impulsively can fuel the fire. Take a deep breath and consider the situation.
● Identify the source: Who's spreading the rumors? Understanding their motives can help you strategize.
● Evaluate the severity: How widespread are the rumors? Can they be easily disproven?

2. Address the Lies Directly (if appropriate):
● For minor situations: If it's a small group, calmly address the rumors directly. Briefly clarify the truth and avoid getting defensive.
● For larger situations: Consider a public statement, but only if it gains traction and silence seems suspicious.

3. Focus on Positive Actions:
● Live authentically: Let your actions speak for themselves. Continue to be the person you are.
● Build trust and credibility: Reinforce your reputation with positive actions and contributions.

4. Limit Exposure to the Negativity:
● Minimize contact: If possible, distance yourself from the source of the rumors and those who spread them.
● Focus on supportive people: Surround yourself with those who know and trust you.

5. Address the Underlying Issues (if applicable):
● Was there a misunderstanding? If there's some truth twisted in the rumors, you might need to address the root cause.
Remember:
● Don't engage in mudslinging. Respond with truth and dignity.
● Don't let it define you. Focus on your values and what truly matters.
●Seek support. Talk to trusted friends, family, or a therapist for emotional support.
In severe cases:
● If the character assassination involves threats, harassment, or defamation, consider legal action.
By staying calm, addressing the situation strategically, and focusing on your integrity, you can minimize the impact of a character assassination attempt.

✍️ ✍️ ✍️ Adam Muh'd Sani

Australian scientists at RMIT University have achieved a groundbreaking feat by 3D printing a titanium structure surpassing the strength of any known alloy by 50%.

This “metamaterial” holds promise for aerospace and medical applications. Unlike conventional materials, metamaterials blend multiple elements to deliver unparalleled properties, ideal for withstanding extreme conditions.

Leveraging 3D printing, the team optimized lattice structures, mimicking nature’s robust yet lightweight designs.

Their innovation enhances structural integrity, deflects cracks, and halves stress concentrations, setting a new standard in material strength.

KETONES AND ALDEHYDES

A ketone is a functional group that consists of a carbonyl carbon (which is a carbon atom bound to an oxygen atom by a double bond) and two alkyl or aryl groups. Alkyl groups are formed by the removal or abstraction of a hydrogen atom from an alkane, whereas aryl groups are formed as a result of the removal/abstraction of a hydrogen atom from an aromatic ring.

ketone, any of a class of organic compounds characterized by the presence of a carbonyl group in which the carbon atom is covalently bonded to an oxygen atom. The remaining two bonds are to other carbon atoms or hydrocarbon radicals (R).

The ketone functional group is characterized by a carbonyl (C=O) group bound to two hydrocarbons (compounds that comprise only carbon and hydrogen atoms), or any other carbon-containing substituents.

●What is the formula of a ketone?
A ketone consists of two hydrocarbon substituents connected to a carbonyl carbon. The general formula of ketone is CnH2nO, where n represents the number of atoms.

How do you identify a ketone?
The presence of two alkyl/aryl substituents linked to a carbonyl carbon defines ketones. The general structure of a ketone is RCOR. Ketones are identified by their pleasant odor and volatile nature.

CLASSIFICATIONS OF KETONES.

Ketones are classified based on the substituents connected to the carbonyl group.
The two classifications are:
=> Symmetrical ketones
=> Unsymmetrical ketones.

● Symmetrical Ketones
Ketones are said to be symmetrical when both the substituents on the carbonyl group are equivalent,

EXAMPLES OF SYMMETRICAL KETONES are:

▪︎ Acetone (dimethyl ketone)
Acetone is a symmetrical ketone, as it consists of two methyl substituents connected to the carbonyl carbon.

▪︎ Benzophenone (diphenylmethanone)
Benzophenone is also an example of a symmetrical ketone, as it consists of two phenyl groups attached to the carbonyl carbon.

● KETONE COMPOUNDS
Ketone compounds have a wide range of applications both in chemical industries as well as in our day-to-day life. Some of the common ketone compounds are:

▪︎ ACETONE
Acetone is used as a major organic solvent in many organic syntheses.

The cost-effectiveness and volatility of acetone makes it suitable for the cleaning of laboratory glassware.

▪︎ SYNTHESIS OF KETONES

Ketones are synthesized through various methods. Some of the common methods of ketone synthesis are as follows:

▪︎ Oxidation of Alcohols
One of the important methods of ketone synthesis is the oxidation of the secondary alcohols.

ALDEHYDES

Aldehyde, any of a class of organic compounds in which a carbon atom shares a double bond with an oxygen atom, a single bond with a hydrogen atom, and a single bond with another atom or group of atoms.
The double bond between carbon and oxygen is characteristic of all aldehydes and is known as the carbonyl group. Many aldehydes have pleasant odours, and in principle, they are derived from alcohols by dehydrogenation (removal of hydrogen), from which process came the name aldehyde.

● Oxidation of alcohols

Aldehydes undergo a wide variety of chemical reactions, including polymerization. Their combination with other types of molecules produces the so-called aldehyde condensation polymers, which have been used in plastics such as Bakelite and in the laminate tabletop material Formica. Aldehydes are also useful as solvents and perfume ingredients and as intermediates in the production of dyes and pharmaceuticals. Certain aldehydes are involved in physiological processes. Examples are retinal (vitamin A aldehyde), important in human vision, and pyridoxal phosphate, one of the forms of vitamin B6. Glucose and other so-called reducing sugars are aldehydes, as are several natural and synthetic hormones.

The carbon atoms bonded to the carbonyl group of an aldehyde may be part of saturated or unsaturated alkyl groups, or they may be alicyclic, aromatic, or heterocyclic rings.

● Nomenclature of aldehydes

There are two general ways of naming aldehydes. The first method is based on the system used by the International Union of Pure and Applied Chemistry (IUPAC) and is often referred to as systematic nomenclature. This method assumes the longest chain of carbon atoms that contains the carbonyl group as the parent alkane. The aldehyde is shown by changing the suffix -e to -al. Because the carbonyl group of an aldehyde can only be on the end of the parent chain and, therefore, must be carbon 1, there is no need to use a number to locate it.

In the compound named 4-methylpentanal, the longest carbon chain contains five carbon atoms, and so the parent name is pentane; the suffix -al is added to indicate the presence of the aldehyde group, and the chain is numbered beginning at the carbonyl group. The methyl group is given the number 4, because it is bonded to the fourth carbon of the chain.

The other method of nomenclature for aldehydes, referred to as common nomenclature, is to name them after the common name of the corresponding carboxylic acid; i.e., the carboxylic acid with the same structure as the aldehyde except that ―COOH appears instead of ―CHO. The acids are usually given a name ending in -ic acid. Aldehydes are given the same name but with the suffix -ic acid replaced by -aldehyde. Two examples are formaldehyde and benzaldehyde.

As another example, the common name of CH2=CHCHO, for which the IUPAC name is 2-propenal, is acrolein, a name derived from that of acrylic acid, the parent carboxylic acid.

Properties of aldehydes
The only structural difference between hydrocarbons and aldehydes is the presence in the latter of the carbonyl group, and it is this group that is responsible for the differences in properties, both physical and chemical. The differences arise because the carbonyl group is inherently polar—that is, the electrons that make up the C=O bond are drawn closer to the oxygen than to the carbon. This gives the oxygen a partial negative charge and the carbon a partial positive charge. The polarity of a carbonyl group is often represented using the Greek letter delta (δ) to indicate a partial charge (that is, a charge less than one).

The negative end of one polar molecule is attracted to the positive end of another polar molecule, which may be a molecule either of the same.

●Common examples of aldehydes and ketones.

The general structure of aldehyde is RCHO, and that of the ketone is RCOR, where R is the hydrocarbon part. Examples of aldehyde are acetal (CH3CHO) and propanal (CH3CH2CHO) and that of the ketone are acetone (CH3COCH3) and acetophenone (CH3COC6H5).

An aldehyde is an organic compound in which the carbonyl group is attached to a carbon atom at the end of a carbon chain.

A ketone is an organic compound in which the carbonyl group is attached to a carbon atom within the carbon chain.

Composition of different elements on different planets!

When a star explodes, releasing different elements into space, the same elements recombine
And over time it forms a sphere and eventually forms a planet.
This is where the constituent elements of each planet differ from the others.

Why our Universe is Relativistic:

Our universe is special-relativistic because the laws of physics are the same in all inertial reference frames, causing the speed of light to be constant relative to all such frames and their observers. This constancy of the speed of light necessitates adjustments to both time and space, resulting in the phenomena of time dilation and space contraction. These relativistic effects are inherent to our quantum-relativistic universe, reflecting the interplay between space and time as dictated by the principles of Einstein's relativity.

Shout out to my newest followers! Excited to have you onboard! Talba Gaya, Alhassan Umar Directer

Experimental demonstration of semiconservative replication. Bacteria grown in medium containing the normal isotope of nitrogen (14N) are transferred into medium containing the heavy isotope (15N) and grown in this medium for several generations. They (more...)

The ability of DNA to serve as a template for its own replication was further established with the demonstration that an enzyme purified from E. coli (DNA polymerase) could catalyze DNA replication in vitro. In the presence of DNA to act as a template, DNA polymerase was able to direct the incorporation of nucleotides into a complementary DNA molecule

Semiconservative replication of DNA. The two strands of parental DNA separate, and each serves as a template for synthesis of a new daughter strand by complementary base pairing.

Direct support for semiconservative DNA replication was obtained in 1958 as a result of elegant experiments, performed by Matthew Meselson and Frank Stahl, in which DNA was labeled with isotopes that altered its density (Figure 3.9). E. coli were first grown in media containing the heavy isotope of nitrogen (15N) in place of the normal light isotope (14N). The DNA of these bacteria consequently contained 15N and was heavier than that of bacteria grown in 14N. Such heavy DNA could be separated from DNA containing 14N by equilibrium centrifugation in a density gradient of CsCl. This ability to separate heavy (15N) DNA from light (14N) DNA enabled the study of DNA synthesis. E. coli that had been grown in 15N were transferred to media containing 14N and allowed to replicate one more time. Their DNA was then extracted and analyzed by CsCl density gradient centrifugation. The results of this analysis indicated that all of the heavy DNA had been replaced by newly synthesized DNA with a density intermediate between that of heavy (15N) and that of light (14N) DNA molecules. The implication was that during replication, the two parental strands of heavy DNA separated and served as templates for newly synthesized progeny strands of light DNA, yielding double-stranded molecules of intermediate density. This experiment thus provided direct evidence for semiconservative DNA replication, clearly underscoring the importance of complementary base pairing between strands of the double helix.