Hydrogen: Best 35 things to know about Hydrogen

Hydrogen

What is the Hydrogen? Hydrogen is produced by many different organisms, including bacteria, algae, and fungi. Artificially hydrogen can be produced from natural gases, oils, coal, and electrolytic processes. H2 gas is colorless, odorless, tasteless, and highly flammable. Hydrogen is a chemical element that occurs naturally in small amounts in the earth’s crust. Hydrogen is … Read more

The best 10 free websites to learn new things or skills.

The best 10 free websites

The best 10 free websites It’s always fun to learn something new. Most of us get so caught up in our daily activities that we don’t take the time to learn the skills we want. This article belongs to the best 10 free websites for those who like to learn or want to pick up a new skill. There are plenty of websites offering free pieces of knowledge on a wide variety of topics. I’ve collected the best 10 free websites that cover a diverse range of topics for you to learn from.   Reddit Reddit is a website where people post links to … Read more

6 basic steps of Data Science in Chemical Engineering: An Overview

Data Science in Chemical Engineering may play a potential role to employ the data for visualization, analysis, and prediction of chemical and biological properties. Data science methods in chemical engineering include the use and development of software, numerical analysis methods, and machine learning may lead to enabling chemical engineering to better understand. The goal behind … Read more

What is the Monkeypox? Best 5 ways to prevent from MPXV.

What is the MonkeyPox?

What is the Monkeypox virus (MPXV)? The monkeypox virus is a zoonotic orthopoxviral that causes a disease known as monkeypox in humans. The virus was first isolated in 1958 in a laboratory in Copenhagen, Denmark, the monkeys were imported from West Africa to the United States. In humans, the first documented case was in 1970. … Read more

Best 5 applications of Python

Best 5 applications of Python

Before talking about ‘Best 5 applications of Python, let’s know about the Python language.   What is Python? Python is a programming language that was developed by Guido van Rossum at AT&T Bell Laboratories in the early 1980s. Python is a general-purpose, interpreted, object-oriented scripting language. It is designed to allow programmers to work faster … Read more

Best 10 websites to get better job opportunities in your professional life

best 10 websites to get a better job

Finding out the best 10 websites to get a better job opportunities is a difficult task because when you googled for the ‘best 10 websites to get a better job’ you will be confused before selecting the best 10 websites. This article is focused on the best 10 websites to get a better job. The best 10 websites were picked after considering the features, ease of use, interface, reputation, and experience of the website.

LinkedIn

This is a social networking website for people who want to get professional jobs, and also want to get connected with professional people. This company was started in 2002 and launched its website in May 2003. LinkedIn helps professionals find jobs and companies recruit employees. On LinkedIn, users create profiles including work history, education, skills, and recommendations from previous employers. Companies use LinkedIn to post their job openings and recruit candidates.

Users may apply directly via the site’s job search engine or upload résumés. Users can make connections with other users who involve in professionalism, they can also share their education, work, experience, and skills. This website has more than 200 million users globally. This website is available in many languages, including Arabic, French, German, Korean, Japanese, and Malay.

  • The United States has the most LinkedIn users, approximately 74 million users.
  • India with 18 million users is in the second number
  • In the United Kingdom with 11 million users
  • Brazil with 11 million users
  • Canada with 7 million users

best 10 websites to get a better job

Official Website: https://www.linkedin.com/

Indeed

Indeed is a free job search engine that enables users to search for local and remote positions across thousands of company pages. US-based employment-related website is available in 60 countries with approximately 28 languages. The main work of this website is listing jobs from thousands of websites. They generate revenue through premium subscriptions which involve premium job posting and resume features for companies. They also offer to post resumes for seekers to get directly a job from Indeed’s website. Mr. Paul Forster and Rony Kahan were founded in 2004 in the USA. Users can narrow results using location, job type, salary, and more. Indeed claims to have information about over 4 million job postings.

Official Website: http://indeed.com/

 

Rozee

A Pakistan-based employment website is a subsidiary of American company Naseeb Networks, Inc. It was founded by Mr. Monis Rahman in 2007. This website has posted jobs from 65 thousand companies and is the number 1 rank in Pakistan.

Official Website: https://www.rozee.pk/

 

Monster

Founded in 1994 by Jeff Taylor, is an employment website globally, owned and prepared by Monster Worldwide, Inc. Monster has 4000 employees worldwide with a revenue of US$800 as per data provided by the company in 2014. This multi-language employment company is a subsidiary of a Dutch MNC human resources consulting firm, named Randstad Holding. Monster is a global online career network connecting millions of people looking for jobs and businesses seeking talent. Monster offers career advice, recruitment services, and online job listings.

Official Website: http://www.monster.com/

 

Dice

A New York City-based career website owned by DHI Group, Inc. Approximately 80,000 technical jobs are listed, 3 million technology professionals are registered and 2.4 million visitors per month are recorded as per the claim of the company.

Official website: https://www.dice.com/

 

CareerBuilder

Founded in 1995 to find a job by job seekers, located offices in Chicago, Illinois, and United States. It became the largest market share among online employment websites in the United States in 2008. The revenue of the company was US$714 in 2016 with 3000 employees globally. This multi Lingual Company is owned by Apollo Global Management.

Official Website: https://www.careerbuilder.com/

Naukri

Naukri.com works on the job listing and employer branding or visibility of advertisement. It is the subsidiary of India’s premier online classifieds company Info Edge. As per the claim of the company, naukri.com had a database of about 46 million registered job seekers. A data set shown by the website claimed that 12,000 resumes were added per day while 195,000 were modified per day.

Official Website: https://www.naukri.com/

 

Glassdoor

Glassdoor.com is a job search engine and review website that uses for anonymously review companies of current and former employees. This multilingual website was founded by Tim Besse, and Robert Hohman, in 2007. This website has 9 million job listings and 50 million unique website visitors. The headquarter is located in Mill Valley, California, USA.

Official Website: https://www.glassdoor.com/

 

Jibber jabber

This is a career website for jobseekers, website is dedicated to helping empower career-minded professionals. It was founded by Jason Alba during his epic failure-of-a-job-search in early 2006.

Official Website: https://www.jibberjobber.com

 

Bayt.com

This is the leading job site in the Middle East and North Africa, connecting job seekers with employers looking to hire. 10 million visits per month while 35 million registered job seekers globally as per the claim of the company. The website was founded in 2000 and operates in three different languages such as French, English, and Arabic. The website works with approx. 40,000 companies including small-scale businesses and government enterprises. For smooth functioning, the website has 14 offices in different countries such as Saudi Arabia, Bahrain, Egypt, Qatar, Jordan, Pakistan, Kuwait, Lebanon, Morocco, UAE, and Oman.

best 10 websites to get a better job

Official Website: https://www.bayt.com/

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3 best ways to determine the concentration of a solution. A conceptual approach

concentration of a solution

When we talk about the concentration of a solution, the mind hits on the water and sugar. The addition of sugar in water is the basic hint to understanding the mechanism for the concentration of a solution. This article will be covering on different types of percentage concentrations of solution along with formulas, derivations, and examples.

What is the concentration of a solution?

The concentration of a solution is defined as the ratio of solute to solvent. A concentrated solution is one where the amount of solute is much greater than the amount of solvent. This means that the solute molecules are packed together tightly, making it difficult for solvent molecules to enter the space between the solute molecules. When we add water to sugar, we create a concentrated sugar solution. Sugar molecules are packed together tightly because they are attracted to each other due to their polarity. Water molecules are polar but not as strongly as sugar molecules. Therefore, water molecules cannot penetrate the sugar molecules as quickly as sugar molecules can penetrate the water molecules.

In simple words, the concentration of a solution is the measurement of the amount of a solute dissolved in each amount of solvent.

As per concentration of a solution, there are two types of solution

  1. A concentrated solution: If a solution has a large amount of dissolved solute.
  2. A dilute solution: If a solution has a small amount of dissolved solute.

There are some common ways to describe the concentrations of a solution as below:

  1. Molarity
  2. Normality (Less commonly used)
  3. Molality (Less commonly used)
  4. Weight-by-weight (Less commonly used)
  5. Weight-by-volume
  6. Volume-by-volume

concentration of a solution

What is the percentage of a solution?

The percentage of a solution is the simplest way to represent the concentration of a solution in percentage. It is an efficient, convenient, and easy way to describe the solution concentrations. There are three types of percentage solutions commonly used in chemistry and chemical engineering:

  1. Percentage weight by weight (w/w)
  2. Percentage weight by volume (w/v)
  3. Percentage volume by volume (v/v)

What is the percentage weight by weight (w/w)?

Percentage weight by weight (w/w) is the easiest way to describe a solution but is not often used in experiments.

For example,

“We dissolve sugar in water. Take 10-gram sugar and mix in 90 grams (equivalent to 90 ml) of water. Now, it can be said that the solutions simply as 10% sugar in water. The concentration of sugar in water will be on a (w/w) basis. It should be noted that the weight of water strictly depends upon the density of water, and the final weight of the solution is not necessarily equal to the final volume.”

Definition and formula:

A weight by weight (w/w) percent concentration can be defined as the weight (mass) of solute divided by the volume (in gram) of solution and multiplied by 100%. The mathematical expression for weight by weight (w/w) percent concentration is below:

Percent\;of\;mass\;(w/w)\;=\frac{mass\;of\;solute}{mass\;of\;solution}\;\times100

If the solute is solid in a solution, the concentration will be expressed as a weight (w/w) or mass (m/m). To prove the above equation, take an example.

Example 1: Prepare a solution in which 30 grams of salt (NaCl) into 100 grams of water. Now we can calculate the percent by weight or mass as below:

Suppose that a solution was prepared by dissolving 25.0 g of sugar into 100 g of water. The percent by mass would be calculated by:

Percent\;of\;mass\;(w/w)\;=\frac{25\;g\;sugar}{25\;g\;sugar+100\;g\;water\;}\;\times100

\mathrm{Percent}\;\mathrm{of}\;\mathrm{mass}\;(\mathrm w/\mathrm w)\;=\frac{25\;\mathrm g\;\mathrm{sugar}}{125\;\mathrm g\;\mathrm{solution}\;\;}\;\times100\;=\;20\;\%\;\mathrm{sugar}

 

Example 2: If you are going to make 300 g of 10 % solution of sodium chloride (NaCl). How much solute will be needed?

Using the same formula of percent concentration of a solution (w/w) as above:

Percent\;of\;mass\;(w/w)\;=\frac{mass\;of\;solute}{mass\;of\;solution}\;\times100

Put the values:

10\;=\frac{\mathrm{Mass}\;\mathrm{of}\;\mathrm{solute}\;(\mathrm g)}{300\;(\mathrm g)}\;\times100

\mathrm{Mass}\;\mathrm{of}\;\mathrm{solute}=30\;g

The answer will be 30 g, you would need to weigh out 30 g of NaCl and add it to 270 g of water.

 

What is the percentage weight by volume (w/v)?

Percentage weight by volume (w/v) is the general and easy way to describe a concentration of a solution. This method of calculation is often used in experiments because of its easiness. In the weight by volume (w/v) basis concentration the solids are dissolved in liquids solvent. The measurement of liquid solvent is easy than the weight of solvent, that’s why this is easy to use in general experiments.

Definition and formula:

A weight by volume (w/v) percent concentration can be defined as the weight (mass) of solute divided by the volume of solution and multiplied by 100%. The mathematical expression for weight by volume (w/v) percent concentration is below:

Percent\;of\;mass\;(w/v)\;=\frac{mass\;of\;solute}{mass\;of\;solution}\;\times100

 

Example 1: If we dissolve sugar in water. Take 10-gram sugar and mix in 100 ml water of final volume.

\mathrm{Percent}\;\mathrm{concentration}\;(\mathrm w/\mathrm v)\;\%\;=\frac{10\;\mathrm g}{100\;\mathrm{mL}}\times100\;=10\%

Now, it can be said that the solutions simply as 10 % sugar in water. The sugar concentration in water will be on the weight by volume (w/v) basis.

 

Example 2: Dissolve 1 gram of salt (NaCl) into a final volume of 100 ml of water.

\mathrm{Percent}\;\mathrm{concentration}\;(\mathrm w/\mathrm v)\;\%\;=\frac{1\;\mathrm g}{100\;\mathrm{mL}}\times100\;=10\%

This solution will be called a 1% NaCl solution on the weight by volume (% w/v) basis.

What is the percentage volume by volume (v/v)?

Percentage volume by volume (v/v) is the easiest way to describe a solution’s concentration of a solution. On the volume by volume (v/v) basis, the liquid as a solute is mixed in a liquid solution. In this method, the solutes are typically prepared volumetrically. Furthermore, the addition of solutes in the solvent has required a kind of attention to get an exact desired concentration.

Definition and formula:

A volume by volume (v/v) percent concentration can be defined as the volume of the solute divided by the volume of solution and multiplied by 100%. The mathematical expression for volume by volume (v/v) percent concentration is below:

\mathrm{Percent}\;\mathrm{concentration}\;(\mathrm v/\mathrm v)\;\%\;=\frac{\mathrm{volume}\;\mathrm{of}\;\mathrm{solute}}{\mathrm{volume}\;\mathrm{of}\;\mathrm{solution}}\times100

Example 1: If we add 40 mL of ethanol with 60 mL of water. The percentage concentration of the solution (v/v) can be calculated as below:

\mathrm{Percent}\;\mathrm{concentration}\;(\mathrm v/\mathrm v)\;\%\;=\frac{40\;\mathrm{mL}}{(40+60)\;\mathrm{mL}}\times100\;=40\;\%

The solution will be known as 40% ethanol solution on the volume by volume (% v/v) basis.

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What is the pH, pH value, and pH scale, and how does it work? 1. Basic concept with solution

When we talk about “What is the pH”, we should remember that we are talking about science, not social science. This article will focus on the basic concept of pH, pH scale, pH values, and a few related numerical examples.   What is the pH? pH is denoted as “potential of Hydrogen”, which measures the … Read more

How i started earning money on Chegg? 1. Step by step 2. Review.

Earning money is a difficult task these days, but earning money on Chegg is easy. It is said that when a person does nothing, something goes on in his mind. The same thing has happened to me. We were facing a complete lockdown due to novel Covid-19 in March of 2020. I was getting frustrated … Read more

How to start earning online on Chegg? 1. Complete procedure. 2. Step by step

Before discussing “How to start earning online on Chegg” read this one “How to start earning as a freelancer on Chegg?” earlier. This short article will be covered how to create an account on Chegg to become an expert in any stream? The complete procedure is briefly discussed step by step. What is the Chegg? Chegg … Read more