These activities were submitted by participants in sessions at the North Central GSA meeting and at the AGU Fall Meeting on Inquiry-Based, Hands-On Classroom Exercises, Lab Demonstrations, and Field Investigations ...
Does a 10°C temperature rise double reaction rates?
"The assertion that "a 10° temperature rise doubles reaction rates" is just a rule of thumb, not a law of nature. Like most rules of thumb, "thumbtimes it works, and thumbtimes it doesn't." In fact, relying this rule to predict the effect of temperature on the rate of a chain reaction can be a catastrophic mistake."
This article from Frostburg University's Fred Senese contains good quality information and an equation calculator for activation energy. The information isn't simply written; it's probably best for the student who wants to extend his learning on this topic of Reaction Rates.
University of Washington scientists have succeeded in removing the extra copy of chromosome 21 in cell cultures derived from a person with Down syndrome, a condition in which the body’s cells contain three copies of chromosome 21 rather than the usual pair. A triplicate of any chromosome is a serious genetic abnormality called a trisomy. Trisomies account for almost one-quarter of pregnancy loss from spontaneous miscarriages, according to the research team. Besides Down syndrome (trisomy 21), some other human trisomies are extra Y or X chromosomes, and Edwards syndrome (trisomy 18) and Patau syndrome (trisomy 13), both of which have extremely high newborn fatality rates.
The targeted removal of a human trisomy, they noted, could have both clinical and research applications. In live births, Down syndrome is the most frequent trisomy. The condition has characteristic eye, facial and hand features, and can cause many medical problems, including heart defects, impaired intellect, premature aging and dementia, and certain forms of leukemia, a type of blood cancer.
Graphene sheets with precisely controlled pores have potential to purify water more efficiently than existing methods.
Piggybacking on the other article from MIT regarding looking at water shortages differently and trying to waste less of it (because goodness knows, we waste a lot--ever heat up your shower water before stepping into it, for instance?), here's a way out -- get water out of the ocean instead to solve the same problem!
Good idea or not?
Graphene sheets are one atom thick; this practical use of knowledge of the atom makes this a good info text article for 8th Science.
S.08.PS.03a Demonstrate an understanding of how the structure of an atom is related to chemical reactions.
In 2012, scientists at CERN discovered evidence of the Higgs boson. The what? The Higgs boson is one of two types of fundamental particles and is a particular game-changer in the field of particle physics, proving how particles gain mass.
Supersaturated Solution - Did you ever sneak an extra spoonful of sugar into your Kool-Aid as a kid but got caught when Mom saw the undissolved sugar at the bottom of the glass?
"The process of crystallization gives off heat. It’s said to be exothermic. That’s why the solution is used in hand warmers (the old-style liquid-type of hand warmers).
How do Hand Warmers Work? The triggering device initiates the rapid solidification of the solution. In the case of salt solutions that release or absorb large amounts of energy during phase changes (common table salt sodium chloride does not do this), the solidification process is a rapid crystallization that releases a large amount of heat at the salt solution's normal melting temperature."
A joint project of Killer Infographics and Mandril Design. Interactivity creates greater reader engagement, which, in turn, generates interest and educates a wide spectrum of people. This particular interactive infographic was picked up by hundreds of websites, including National Geographic!
The precision of the interactive scalability highlight the importance of accuracy in successful infographics - Killer Infographics will never publish any data they won't stand behind!
By characterizing the geographic and functional spectrum of human genetic variation, the 1000 Genomes Project aims to build a resource to help to understand the genetic contribution to disease. The genomes of 1,092 individuals from 14 populations, constructed using a combination of low-coverage whole-genome and exome sequencing were analyzed. By developing methods to integrate information across several algorithms and diverse data sources, a validated haplotype map of 38 million single nucleotide polymorphisms, 1.4 million short insertions and deletions, and more than 14,000 larger deletions were provided. Individuals from different populations carry different profiles of rare and common variants, and low-frequency variants show substantial geographic differentiation, which is further increased by the action of purifying selection. An evolutionary conservation was found and coding consequence are key determinants of the strength of purifying selection, rare-variant load varies substantially across biological pathways, and each individual contains hundreds of rare non-coding variants at conserved sites, such as motif-disrupting changes in transcription-factor-binding sites. This extensive resource, which captures up to 98% of accessible single nucleotide polymorphisms at a frequency of 1% in related populations, enables researchers to perform a detailed analysis of common and low-frequency variants in individuals from diverse backgrounds.
Students should use Ebsco Login information found on page 24 of the assignment notebook.
"The article offers information on neutron and discusses on the neutron's average lifetime. It stated that neutron, unlike proton, is neutral and isloated within the atomic nucleus. It also discusses on the neutron's life that in end turns into a proton through a process known as beta decay and informs that neutrons are usually bound in a nucleus."
8th grade science target: S.08.PS.02b Describe the Structure of an Atom.