This lesson covers solved numerical problems on molarity, molality, mole fraction, and percentage concentrations to help you clearly understand solution concentration concepts in chemistry.

You probably don’t need more time. By Jancee Dunn When I look back on all the major decisions I’ve dithered over, I could scream. It took me a decade to commit to becoming a parent. I wavered for a ...

We like to think that we're pretty good at math, especially after years of schooling. But every once in a while, a simple third-grade math problem manages to trip us up and make us question our ...

Some readers are fed up with me! “Don’t guilt trip me” is a refrain I heard from many readers of my recent columns from West Africa and South Sudan about children dying because of cuts in American ...

As quantum computing develops, scientists are working to identify tasks for which quantum computers have a clear advantage over classical computers. So far, researchers have only pinpointed a handful ...

A record-high share of Americans want the government to do more to tackle the nation’s problems – but few think the political parties are up to the task, according to new polling. In the latest SSRS ...

Recently, a friend asked for help with a tricky problem: they were staging a play, and the script had a large number of characters. They didn’t want to hire an actor for each role, and while they ...

Owners returning home to a chewed-up couch or trash thrown around might brush it off and learn to tolerate the dog's unwanted behaviors, but new research revealed a range of naughty behaviors occur in ...

Timothy A. Downing has received PhD fellowship (2022-2024) funding from the DAAD Global Centers- AFAS (African Climate and Environment Center- Future of African Savannas) programme Cornelius Okello ...

For those who have wrestled a bulky couch around a tight corner and lamented, “Will this ever get through?” mathematicians have heard your pleas. Geometry’s “moving sofa problem” asks for the largest ...

Google's AI overviews appear in 30% of searches and nearly three-quarters of problem-solving queries, according to a new study. AI Overviews mostly appear in mid-volume searches, not high-traffic ...

If your PC restarts unprompted, freezes, or programs crash, you could have a RAM problem on your hands. To find out whether RAM really is the problem, you can use your PC’s memory diagnostics tool to ...