Have you seen episode one of Years of Living Dangerously with Harrison Ford? It showed me how politics and corruption are contributing to climate changes. Precious jungle areas protect the decaying peat beds from releasing dangerous levels of carbon dioxide. Mans' desire to replace aging forest trees with palm trees will disrupt the atmosphere with serious gas emissions. Palm oil plantations have already destroyed much area of forestry in Indonesia. Jungle floors would be unharmed in their emissions if consumers were not demanding so many products with palm oil in them. Maybe someone as famous as Harrison Ford will get the attention of enough people to influence politicians around the world to demand change in manufacturers' practices that drive the demand for palm oil.
Question 1 Do You Think That This Lab Was An Accurate Simulation of the Effect of
Acid Rain on Building Materials? Be Specific.
By creating in a lab a miniature simulation, I think there are some things that can be related to the actual acid rain on building materials. We created a limited, but full scale
of pH to simulate the ranges of other acids and alkaline substances. While a lab working with vinegar may not be an exact indicator of the acid rain formation, the number on the pH acidity scale is merely a simulation of the cloud formation pH of 4.2.
Vinegar, at a 3, is within the range up to a 5 for acid reaction to building materials.
There were observations for each material that showed an increased pH for each material after placed in the vinegar tubes.
The problems that I see are this: the lab did not control the amount of time each substance was in the tube; the simulation did not alter the temperatures to reflect that in nature and the changes in seasons; the elements used were not uniform in their amounts; the substances were not retrieved from the vinegar to look at them dried out and there were not timed intervals for each substance for the alkaline vs. the acid base.
I do not believe that a precise conclusion can be made from this experiment but I think
that we can begin to see the problems associated with acid erosion on a building material in a small way in our test tubes even with no other controls.
Question 4 Why Don’t We Make Structures Out of Magnesium?
By looking at the test tube during the experiment with magnesium and vinegar, I would think that magnesium would be too fragile for structures as it dissolved somewhat when placed in vinegar. It did not change in form when placed in the tap water. This was an experiment with magnesium as a single element. Based on this experiment, a structure made of pure magnesium would have a chance of eroding when exposed to acidic elements. However, magnesium is a strong element when combined or used as a compound with other materials in building structures. Actually, magnesium is the 3rd most commonly used structural metal due to its lightness. Since it is so light, it is used in alloys for airplanes and missiles. Magnesium has the capacity to ignite when in a powder but not likely in a larger mass.
Question 5 Why Did We Use Three Tubes with Regular Tap Water?
In the first part of the experiment we used three tubes with regular tap water. We were going to test three substances, marble, magnesium and limestone and therefore would need a testing base for each of the three items to be clean with the same testing base to make the comparisons. The tap water provided us with a control base that had an alkaline pH of approximately 6.5.
When the three substances were added to the water, the pH stayed almost the same. This base allowed us to see that no visible changes occurred when the substances added to the solution resulted in a pH identical to the original pH of 6.5. By remaining identical to
the original pH in the first part of the experiment, we could compare the base used
in the second part to see if the substances changed. The tap water became the control for comparisons. This also allowed us to note that alkaline pH is less likely to result in
having an effect upon the substances tested than an acidic base in the second part of the experiment.
for science we can read a science article and write a paragraph about what the article is about.
Talula 6y Where Native Americans Come From By Tina Hesman Saey Published on February 18,2014
Native Americans are all descended from Clovis man and and DNA studies recently disclosed that they may have traveled from Asia not Europe. These scientist based their new information on the bone comparison of a 12,600 year old infant to a child known as Mal'ta who lived in Siberia 24,000 years ago that connection suggest a common Asian heritage. For many years scientist thought that ancient people were Europeans who traveled across the Atlantic before moving west. This former idea was called the Solutrean hypothesis. Sarah Anzick, a molecular biologist worked on a study that allowed scientist to read a persons full genetic blueprint. Anzick then traveled to Copenhagen with the bones of the Clovis infant. She and an evolutionary geneticist preformed important test on the two toddlers. These tests clearly showed that 1/3 of the Clovis baby genome traces to ancient Siberian people. This new data connects the idea that East Asians and Siberians interbred well before the Clovis. The descendants would become the original Native Americans.
read the article at https://student.societyforscience.org/article/where-native-americans-come