What is characteristic of a mineral? A.It must be amorphous and have un indefinite chemical composition. B.Its must be amorphous
1 answer:
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Answer:
The concentration of H₂C₂O₄ is 7,1800x10⁻³ M
Explanation:
The reaction of the titration is:
2 KMnO₄ + H₂C₂O₄ → 2 CO₂ + K₂O + 2 MnO₃ + H₂O
22.14g of KMnO₄ in 1,00L of water have a molarity of:
22,14g KMnO₄/L× = 0,14 M of KMnO₄
The moles you required for a complete reaction are:
0,14 mol KMnO₄/L× 0,02050L = 2,872x10⁻³ mol KMnO₄
By the reaction 2 moles of KMnO₄ reacts with 1 mole of H₂C₂O₄, thus, the moles of H₂C₂O₄ that react were:
2,872x10⁻³ mol KMnO₄× = 1,436x10⁻³ moles of H₂C₂O₄
As the volume of the sample was 200,0mL≡ 0,2000L, The concentration of H₂C₂O₄ is:
= <em>7,1800x10⁻³ M</em>
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I hope it helps!
Answer:
Are memories stored in just one part of the brain, or are they stored in many different parts of the brain? Karl Lashley began exploring this problem, about 100 years ago, by making lesions in the brains of animals such as rats and monkeys. He was searching for evidence of the engram: the group of neurons that serve as the “physical representation of memory” (Josselyn, 2010). First, Lashley (1950) trained rats to find their way through a maze. Then, he used the tools available at the time—in this case a soldering iron—to create lesions in the rats’ brains, specifically in the cerebral cortex. He did this because he was trying to erase the engram, or the original memory trace that the rats had of the maze.
Lashley did not find evidence of the engram, and the rats were still able to find their way through the maze, regardless of the size or location of the lesion. Based on his creation of lesions and the animals’ reaction, he formulated the equipotentiality hypothesis: if part of one area of the brain involved in memory is damaged, another part of the same area can take over that memory function (Lashley, 1950). Although Lashley’s early work did not confirm the existence of the engram, modern psychologists are making progress locating it. Eric Kandel, for example, spent decades working on the synapse, the basic structure of the brain, and its role in controlling the flow of information through neural circuits needed to store memories (Mayford, Siegelbaum, & Kandel, 2012).
Many scientists believe that the entire brain is involved with memory. However, since Lashley’s research, other scientists have been able to look more closely at the brain and memory. They have argued that memory is located in specific parts of the brain, and specific neurons can be recognized for their involvement in forming memories. The main parts of the brain involved with memory are the amygdala, the hippocampus, the cerebellum, and the prefrontal cortex
