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Chemistry Problems

Use chemistry problems as a tool for mastering chemistry concepts. Some of these examples show using formulas while others include lists of examples.

Acids, Bases, and pH Chemistry Problems

Learn about acids and bases. See how to calculate pH, pOH, K a , K b , pK a , and pK b .

  • Practice calculating pH.
  • Get example pH, pK a , pK b , K a , and K b calculations.
  • Get examples of amphoterism.

Atomic Structure Problems

Learn about atomic mass, the Bohr model, and the part of the atom.

  • Practice identifying atomic number, mass number, and atomic mass.
  • Get examples showing ways to find atomic mass.
  • Use Avogadro’s number and find the mass of a single atom .
  • Review the Bohr model of the atom.
  • Find the number of valence electrons of an element’s atom.

Chemical Bonds

Learn how to use electronegativity to determine whether atoms form ionic or covalent bonds. See chemistry problems drawing Lewis structures.

  • Identify ionic and covalent bonds.
  • Learn about ionic compounds and get examples.
  • Practice identifying ionic compounds.
  • Get examples of binary compounds.
  • Learn about covalent compounds and their properties.
  • See how to assign oxidation numbers.
  • Practice drawing Lewis structures.
  • Practice calculating bond energy.

Chemical Equations

Practice writing and balancing chemical equations.

  • Learn the steps of balancing equations.
  • Practice balancing chemical equations (practice quiz).
  • Get examples finding theoretical yield.
  • Practice calculating percent yield.
  • Learn to recognize decomposition reactions.
  • Practice recognizing synthesis reactions.
  • Practice recognizing single replacement reactions.
  • Recognize double replacement reactions.
  • Find the mole ratio between chemical species in an equation.

Concentration and Solutions

Learn how to calculate concentration and explore chemistry problems that affect chemical concentration, including freezing point depression, boiling point elevation, and vapor pressure elevation.

  • Get example concentration calculations in several units.
  • Practice calculating normality (N).
  • Practice calculating molality (m).
  • Explore example molarity (M) calculations.
  • Get examples of colligative properties of solutions.
  • See the definition and examples of saturated solutions.
  • See the definition and examples of unsaturated solutions.
  • Get examples of miscible and immiscible liquids.

Error Calculations

Learn about the types of error and see worked chemistry example problems.

  • See how to calculate percent.
  • Practice absolute and relative error calculations.
  • See how to calculate percent error.
  • See how to find standard deviation.
  • Calculate mean, median, and mode.
  • Review the difference between accuracy and precision.

Equilibrium Chemistry Problems

Learn about Le Chatelier’s principle, reaction rates, and equilibrium.

  • Solve activation energy chemistry problems.
  • Review factors that affect reaction rate.
  • Practice calculating the van’t Hoff factor.

Practice chemistry problems using the gas laws, including Raoult’s law, Graham’s law, Boyle’s law, Charles’ law, and Dalton’s law of partial pressures.

  • Calculate vapor pressure.
  • Solve Avogadro’s law problems.
  • Practice Boyle’s law problems.
  • See Charles’ law example problems.
  • Solve combined gas law problems.
  • Solve Gay-Lussac’s law problems.

Some chemistry problems ask you identify examples of states of matter and types of mixtures. While there are any chemical formulas to know, it’s still nice to have lists of examples.

  • Practice density calculations.
  • Identify intensive and extensive properties of matter.
  • See examples of intrinsic and extrinsic properties of matter.
  • Get the definition and examples of solids.
  • Get the definition and examples of gases.
  • See the definition and examples of liquids.
  • Learn what melting point is and get a list of values for different substances.
  • Get the azeotrope definition and see examples.
  • See how to calculate specific volume of a gas.
  • Get examples of physical properties of matter.
  • Get examples of chemical properties of matter.
  • Review the states of matter.

Molecular Structure Chemistry Problems

See chemistry problems writing chemical formulas. See examples of monatomic and diatomic elements.

  • Practice empirical and molecular formula problems.
  • Practice simplest formula problems.
  • See how to calculate molecular mass.
  • Get examples of the monatomic elements.
  • See examples of binary compounds.
  • Calculate the number of atoms and molecules in a drop of water.

Nomenclature

Practice chemistry problems naming ionic compounds, hydrocarbons, and covalent compounds.

  • Practice naming covalent compounds.
  • Learn hydrocarbon prefixes in organic chemistry.

Nuclear Chemistry

These chemistry problems involve isotopes, nuclear symbols, half-life, radioactive decay, fission, fusion.

  • Review the types of radioactive decay.

Periodic Table

Learn how to use a periodic table and explore periodic table trends.

  • Know the trends in the periodic table.
  • Review how to use a periodic table.
  • Explore the difference between atomic and ionic radius and see their trends on the periodic table.

Physical Chemistry

Explore thermochemistry and physical chemistry, including enthalpy, entropy, heat of fusion, and heat of vaporization.

  • Practice heat of vaporization chemistry problems.
  • Practice heat of fusion chemistry problems.
  • Calculate heat required to turn ice into steam.
  • Practice calculating specific heat.
  • Get examples of potential energy.
  • Get examples of kinetic energy.
  • See example activation energy calculations.

Spectroscopy and Quantum Chemistry Problems

See chemistry problems involving the interaction between light and matter.

  • Calculate wavelength from frequency or frequency from wavelength.

Stoichiometry Chemistry Problems

Practice chemistry problems balancing formulas for mass and charge. Learn about reactants and products.

  • Get example mole ratio problems.
  • Calculate percent yield.
  • Learn how to assign oxidation numbers.
  • Get the definition and examples of reactants in chemistry.
  • Get the definition and examples of products in chemical reactions.

Unit Conversions

There are some many examples of unit conversions that they have their own separate page!

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7 Apps That Can Do Your Homework Much Faster Than You

7 Apps That Will Do Your Homework For You

In the field of educational technology, some apps might be getting too smart.

More and more apps are delivering on-demand homework help to students, who can easily re-purpose the learning tools to obtain not just assistance, but also answers. Whether or not that’s cheating—and how to stop it—is one of the concerns surrounding a new app that can solve math equations with the snap of a camera . While the software has inspired teachers to create real-world homework problems that can’t be automatically solved , that strategy doesn’t hold up to other apps that tap into real-life brains for solutions.

Here’s a look at 7 apps that can do your homework for you, and what they have to say about cheating:

Price : Free Availability : iOS, Android app coming in early 2015

The new, seemingly magic app allows users to take pictures of typed equations, and then outputs a step-by-step solution. As of Wednesday, the app is the number one free app on the App Store. But the biggest issue, one teacher argues , isn’t if students will use the app to cheat, because many will. Rather, it’s about how teachers will adapt. A PhotoMath spokeswoman said educators have welcomed the app with positive reviews, but the software remains “quite controversial.”

“We didn’t develop PhotoMath as a cheating tool. We really wanted kids to learn,” said Tijana Zganec, a sales and marketing associate at tech company MicroBlink, which created PhotoMath. “If you want to cheat, you will find a way to cheat. But if you want to learn, you can use PhotoMath for that.”

Whether you’re a high schooler with eight periods of classes or a college student tackling dozens of credits, there’s one thing you’ve got for sure: a mess of assignments. iHomework can help you keep track of all your work, slicing and dicing it in a variety of ways. Sorting it by due date, week, month, or by course, the app is more organized than a Trapper Keeper. And in integrating data from Questia, you can link your reading material to your assignments so you don’t have to dig through a pile of papers to find the right information.

A scheduling feature can help you keep track of those random bi-weekly Thursday labs, and you can even mark the location of your courses on a map so you don’t end up on the wrong side of campus. And finally, with iCloud syncing, you can access all this information on whatever Apple-compatible device you’re using at the moment — no need to dig for your iPad.

Google Apps for Education

Taking the search giant’s suite of free browser-based apps and sandboxing them so they are safe for school use, Google Apps for Education is an excellent alternative to the mainstream installable productivity software, but this one has a perk that almost school board will love—it’s free. Packaging together favorites like Gmail, Hangouts, Google Docs, Google Sheets, and Google Drive with Classroom, a digital hub for organizing assignments and sending feedback, the goal of this collection is to make learning a more collaborative process.

Though Google Apps for Education is cloud-hosted, the programs can be used offline, ideal for when your student needs to escape the internet and work distraction-free. And since it works on any device, it also helps students avoid buying overly expensive hardware. That means more money for extracurricular activities.

Price: Free, but some homework services require payment Availability: iOS and Android

HwPic is a tutoring service that allows students to take send pictures of their homework to tutors, who will then respond within minutes to your questions with a step-by-step solution. There’s even an option to expedite the answers if a student is in a hurry. HwPic Co-Founder Tiklat Issa said that the app was initially rejected by Apple’s App Store, which believed it would promote cheating, but he successfully argued that just because someone uses the app in a way that it’s not meant to be used doesn’t mean the app should be punished.

Issa added that HwPic prohibits cheating in its terms and conditions. Tutors don’t solve homework that has words like “Quiz” or “Exam,” and they often know if a student is sending a photo during a test if they’ve paid for expedited answers, and if the photo is dim, blurry and taken under a desk. “We’ve minimized cheating,” said Issa. “We haven’t eliminated it. That’s kind of unrealistic.”

Wolfram Alpha

Price : $2.99 Availability : iOS and Android

Wolfram Alpha is similar to PhotoMath, only that it targets older students studying high levels of math and doesn’t support photos. The service also outputs step-by-step solutions to topics as advanced as vector calculus and differential equations, making it a popular tool for college students.

“It’s cheating not doing computer-based math, because we’re cheating students out of real conceptual understanding and an ability to drive much further forward in the math they can do, to cover much more conceptual ground. And in turn, that’s cheating our economies,” said Conrad Wolfram, Wolfram Research’s Director of Strategic Development, in a TEDx Talk . “People talk about the knowledge economy. I think we’re moving forward to what we’re calling the computational knowledge economy.”

Homework Helper

Price: Free Availability: iOS and Android

Chinese Internet search company Baidu launched an app called Homework Helper this year with which students can crowdsource help or answers to homework. Users post a picture or type their homework questions onto online forums, and those who answer the questions can win e-coins that can be used to buy electronics like iPhones and laptops.

The app has logged 5 million downloads, much to the dismay of many some parents who argue that the students spend less time thinking about challenging problems. A Homework Helper staffer admitted to Quartz , “I think this is a kind of cheating.”

Price: Free, but some homework services require payment Availability: iOS

Slader is a crowdsourcing app for high school and college students to post and answer questions in math and science. While students can post original homework for help, many questions in popular textbooks have already been answered on the app, according to Fast Company . An Illinois high school said earlier this year that it suspected students were using the service to cheat on their math homework.

Slader argues that it’s “challenging traditional ideas about math and education,” and said that the ideas behind its app “aren’t a write-off to teachers,” according to its blog . Slader told San Francisco media outlet KQED that it shouldn’t be dismissed as a cheating tool, but rather considered a way for students to access real-time help.

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Benefits of Homework: 

So, is homework necessary at all , here are some cons of homework: , 1. talk to your teachers    , 2. friends can help , 3. take homework help from tutorbin  , taking homework help from tutorbin will guarantee you: .

A quote by Benjamin Franklin defines student life better than any other definition- “ Without continual growth and progress, such words as improvement, achievement, and success have no meaning. ” 

Throughout their tenure, teachers adopt different methods to ensure the continuous progress of students. Practice revisions, tests, class discussions, and different projects are some of these methods to name a few.

Sometimes, these different methods are clubbed together or used in different combinations in the form of homework. Our experts have explained three different yet effective ways how to find homework answers quickly.

Homework or the work assigned to any student to complete at home has proven to be one of the most effective ways to invoke better performance from students. Studies have shown that students with homework outperform 69% percent of students who were without it in standardized tests.     

Time and time again, our homework solutions have helped us progress in our studies on a deeper level. They have helped us improve our learning journeys in the following ways:   

   

homework help

Teachers and parents make ample arguments for the indispensable nature of homework in studies. The benefits of homework can be categorized as follows:  

  • Improved grades:  Studies show that students who spend an appropriate time doing their homework show greater success in the form of better grades.
  • Helps In revision:  Different researchers point out that students usually retain only 50% of what they learn in class. Homework offers students a chance to revise what they have been taught at school. It enables them to get a better grip on their studies.
  • Promotes Practice:  Daily homework encourages the importance of daily practice. It helps students to sharpen their skills and ace their subjects. It also gives them a chance to attain in-depth learning of concepts.

With these notions, it seems evident that Homework should be an inseparable part of student education. Still, even the most stellar students staunchly dislike it.  

Nowadays, homework has become a word that easily extracts frowns of irritation, contempt, and sometimes fear from students of all ages. You might be a student of master’s, Ph.D., bachelor’s, High school, Middle school, and even primary school; you probably won’t enjoy doing homework. Well, you can personally blame the Italian pedagogue Roberto Nevillis if you want to.

He is often blamed for the invention of homework in the internet discourse. But it still will not change the fact that homework is a vitally important concept in the educational structure of the world. Despite all the protests against it, students are still asking “how to find homework solutions?” 

Well, it turns out that subjecting students to rigorous homework often does more harm than good for their education itself. Let us take a look at some of the problems elevated by homework.       

  • Widens the digital Gap: A report finds that around 97 % of students need access to the internet to complete their homework answers . Another study brought a rather troubling fact to light-30% of public-school students did not have adequate access to the internet. Since homework is given a great emphasis in studies, those who lack the necessary means to complete it often lag behind.  
  • Causes Undue Stress: A poll of California students revealed that 59% of them were suffering from stress concerning too much homework. Homework-related stress can decrease productivity and hampers the learning process.  
  • Can hamper Important Tasks: A 2006 study showed that even if homework correlates to better grades, it cannot be associated with the surety of achievements in life. Homework also consumes the time that can be dedicated to more important activities like extracurriculars, important projects, revisions, etc. Some of these tasks might be important in the long run of students’ careers, but they cannot do Them if homework is given such importance in their course.  
  • Occurrence of some important events: When teachers make homework mandatory, they ignore one very important factor. There are moments in students’ lives when there are some unforeseen life events that demand their absolute focus. But if students are not able to do their HomeWorks because of this, they tend to lose some important marks.    

Hence a problem arises. You want to do your homework; you cannot do your homework. But you still need to complete your homework. In such cases, the need for homework solutions becomes really important. Once it becomes clear that they themselves cannot write their homework answers, they try to get it by other means. An urgent necessity for getting good and reliable homework solutions is caused by the fact that these marks will fetch them better marks.      

If this is the case you might be wondering- how to find homework solutions fast? 

We have an answer to that question in the form of some good methods that can help you. 

how to find homework answers fast

School and college teachers often pride themselves on this particular mantra- “You can ask a question a thousand times, we will answer it a thousand times.” 

Although more often than not, teachers are the ones who rush the syllabus to finish it on time. This approach is detrimental to the students who have a lesser grasp of the concepts. They need more understanding and lag behind their peers.                            

Nevertheless, you can just trouble your teachers about your homework issues so that you can get the right homework solutions. This will help you build a credible relationship with your professors. You are not only asking a reliable authority for help but also someone who implored you to ask a thousand times if needed.         

Students also have a mantra that goes- “a friend in need is a friend indeed”  

This is certainly true as you can always count on your friends if you think you cannot handle your homework alone.  

Research shows that studying with a group, preferably with a group of friends will boost your retention power. It also increases your productivity as suddenly your homework changes from a somber task to a productive hangout.  

It also serves a mutual purpose as what your friends find difficult can be easy for you and vice versa. This will lead to multiple insights and perspectives on the same body of work. 

This Particular kind of learning promotes an in-depth clarity of the subject and the problems 

If these ways are not something up your alley, there is yet another way. While the other methods might not offer a perfect and sure-fire solution, this one will definitely help you complete your homework.  

You can ask for homework help from TutorBin .  

TutorBin is a student-centric firm that aims to bridge the gaps between expert talents and those who need that talent. Our goal remains to create a cultivating environment for students to grow and learn. Our usual clients hail from reputed institutions of countries like the USA, UK, Canada, Australia and more.    

Our experts belong to the top cream of talents, being alumni of some of the most prestigious institutions in their field. They are hardworking and talented individuals with a knack for using their talents for students who need them. One of the most popular ways we do it is by providing 24/7 homework help. 

  • 100% accurate and detailed solutions that get you better grades.  
  • On-time submission to prevent any negative marking 
  • Customer- Confidentiality to keep your information secure  
  • Affordable rates and customer benefits, rewards, and bonuses   
  • Instant refund in case of dissatisfaction 
  • Unlimited rewrites to guarantee your satisfaction 

In terms of reliability, our results speak of our merits. We have 65000+ tutors for more than 250 subjects ranging from STEM fields to Arts and commerce. We have delivered more than 300000 assignments to 100000+ till now and we are still going strong.  

Therefore, if you are worried about how to find homework answers , we are here for you. You can always count on us in case your homework is troubling you a bit too much. We will be waiting.    

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About tutorbin, what do we do.

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If aliens arrive, how will we talk to them? These experts have some answers

Large radio telescopes in the outback with a star filled sky.

Humans have long been fascinated by extraterrestrial life and particularly intrigued by how aliens might communicate.

It's the central plot of blockbuster science fiction films like Arrival, Contact and Close Encounters of the Third Kind.

Yet this question is not just for sci-fi movie fans. Xenolinguistics is the study of languages that may be spoken by intelligent life forms, and a team of experts is giving this some serious thought.

In 2022, the Cambridge Institute of Exo-Language at Cambridge University (CIEL) dedicated to understanding potential extraterrestrial languages, was established in preparation for making contact with intelligent life that may exist beyond our galaxy.

Indeed, the criteria for extraterrestrial life to be considered "intelligent" is the ability to develop a technological civilisation.

Ian Roberts, professor of linguistics at the University of Cambridge, helped to establish CIEL.

He told ABC RN's Future Tense  he's confident intelligent extraterrestrial civilisations exist and that these civilisations also have a common language.

"Any species which, like us, develops some kind of technological civilisation will have language," Professor Roberts says.

CIEL is adding to the work of METI International, a US-based not-for-profit organisation founded in 2015, which attempts to communicate with extraterrestrial beings.

METI International's founder and president Douglas Vakoch says it's imperative that serious research is undertaken into the principles of language and communication in preparation for this type of potential contact.

"We might be faced with decrypting a message from an unknown civilisation, and linguists could provide the key to cracking the code," Mr Vakoch says.

Like Professor Roberts, Mr Vakoch believes in the existence of intelligent life beyond earth.

"We know the basic chemical building blocks are strewn throughout space, so there is a lot of real estate where life could exist, as well as the chemical ingredients for life.

"It would be a miracle if there were no intelligent life anywhere, and I don't believe in miracles," he says.

A silver diamond shaped plaque with etchings on it.

The aim of CIEL could be considered slightly premature, given that we aren't yet aware of the existence of intelligent extraterrestrials.

But Professor Roberts says the logistics of contacting a solar system or exoplanet (a planet outside of our solar system) will be no easy feat.

The initial hurdle would be establishing the form of message to be sent. Then, given the closest exoplanets are about four light years away, it could mean a minimum eight-year wait to send and then potentially receive a response. So scientists are really in this for the long haul.

How exactly would we communicate with aliens?

Critics have often compared any efforts to communicate with extraterrestrial beings with humans' inability to communicate with animals on earth.

And clearly, while hand gestures and instructions are understood by dogs and some primates, for example, humans are yet to have deep conversations with another animal species.

Professor Roberts counters this common theory.

He says that, with the possible exception of dolphins, most other animal species on Earth are generally considered to be less intelligent than humans.

So, he argues, it's not a fair comparison.

However, Dr Arik Kershenbaum, zoologist and lecturer at the University of Cambridge, says we can look to animals to see how different types of communication have evolved in different environments.

"If an extraterrestrial civilisation evolved in an alien ocean, then we can look at dolphins and whales to see what kind of signals travel well underwater, and what constraints ocean-living puts on how much information can be conveyed," he says.

Laws of evolution

When it comes to alien technological civilisations, Professor Roberts says there is a greater likelihood that their language would have similarities to ours because the laws of evolution are likely to be similar.

"One thing that is very widely believed among people who think about the nature of extraterrestrial life is that the laws of evolution must be the same everywhere," he explains.

Mr Vakoch agrees. He says there's likely to be a limit to the number of configurations of life and environments.

"We shouldn't be surprised to find alien life that bears strong similarities to familiar life forms here on Earth," he says.

Black and white image of a space ship flying over a city park.

And so it's likely that the structure of an alien civilisation's language would also have similarities to human communication.

The difficulty lies in establishing how exactly the language of extraterrestrials could be channelled. 

Dr Kershenbaum has explored what those channels could possibly be.

"One can't help wondering whether aliens might have evolved a language based on a completely different communication from ours [perhaps] whistles instead of words, images instead of sounds, [or] electrical pulses," he says.

While humans primarily use speech, written language and other forms such as sign language, Professor Roberts says this is one of the most uncertain factors to determine.

"I think it is really quite unpredictable, we will only know when we find them."

What if they're smarter than us?

If aliens do exist, Professor Roberts suggests there is a good chance that they're more advanced than humans.

"Any technological civilisation we make contact with will be much more advanced than us because we are, in technological terms, a very young civilisation," he says.

Professor Roberts explains that humans are considered a relatively young civilisation because we've only been emitting radio waves into the universe for just over 100 years.

"The overwhelming likelihood is that any civilisation we encounter will be older and therefore significantly more advanced than us," he says.

"And the implications of that [will be] very interesting."

Consequently, if they are more advanced than us, then Professor Roberts also believes they're likely one step ahead of us and aware of our existence — and our language.

So, how prepared are we?

The recent Pentagon UFO report  released by  the US Department of Defense debunked calls that Unidentified Anomalous Phenomena (UAPs) were extraterrestrial life forms.

Mr Vakoch says we'll undoubtedly be surprised by first contact with other civilisations if and when it happens.

He says we can never anticipate all the relevant issues that may crop up, but considering communication could help us prepare.

"The beauty of designing interstellar messages and sending them to other stars is that it forces us to make clear our assumptions about what intelligence is and how language works," he says.

Professor Roberts says it's currently possible for us to potentially establish rudimentary contact with another civilisation, but any genuine communication will rely on language.

"Language has to be the means of communication," he says.

"We have to find a way to decipher their language, and they have to find a way to decipher ours."

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