After adding Iodine salts, and filtering the mixture our next goal was to test for three important chemicals that must exist in our mixture for it to be a true iodine tincture; Iodine, Iodide Ion and the triiodide ion. After several tests and comparisons of observations with their standards it was found that our tincture had all three chemicals present and therefore was ready for use. Focus Questions * How can I make a pharmaceutical product from seaweed? A pharmaceutical product can be made from seaweed by placing the sea weed in water and using heat energy to interact and break the bonds in the sea weed. Then by filtering, iodide can be extracted which when combined with other substances can make an iodine tincture, that is a pharmaceutical product.
b. potential independent variables that are held constant. c. measured by the researcher. d. probable behavioral causes. 6. One reason a valid experiment may produce null results is a. the range of levels in the independent variable was insufficient to show an effect.
QUESTIONS 1. Make an observation – Based on the data in Table 4, discuss what patterns you observe in regards to dissolved oxygen content and fish populations in the body of water? Answer = By my observation the pattern goes by minus 1 twice, then minus 2 twice, then plus 3 twice, then minus 4 twice, then minus 5, so the pattern is 1,2,3,4,5, and so on. 2. Do background research – Utilizing at least one scholarly source, describe how the dissolved oxygen content in a body of water can effect fish populations.
If determinism is true, then we don’t have free will. Discuss. It can be argued that if determinism is true, then we do not have free will. However, this argument really depends on which stream of determinism is being referred to. The argument that supports this idea the most is the fatalism argument - the idea that everything is predetermined before we are born and our actions do not affect this.
2. In Experiment 1, explain why the membrane potential between the axon hillock and axon either changed or did not change with subthreshold stimulus. Differences of 1.0 mV or less are not significant Subthreshold is a change as it hasn’t reached the action potential level. 3. In Experiment 2, explain why the membrane potential between the axon hillock and axon either changed or did not change with threshold stimulus.
b) control. c) replication. d) hypothesis. Question: Which among the choices is the best answer and explain why. A scientific control is the group not exposed to the conditions of the experiment, the control is designed to minimize the effects of variables other than the single independent variable.
LAB:Homeostasis of Gold Fish Introduction: Homeostasis is a word that is used to describe the act of keeping your body in balance. For example, when you run, your body maintains homeostasis by taking more breaths and increasing your heart rate. This lab will provide you with your first opportunity to design your own experiment. The nature of science: The purpose of science is to find answers to questions that we are curious to know the answer to. Generally, these questions have to do with the natural world.
According to the First Law of Thermodynamics, energy cannot be created or destroyed. There-fore, energy is not really lost, but may be released in another form such as heat or light. In this form, the energy may be partly unusable. (p. 28) 25. a. Ca, b. C, c. H, d. Fe, e. N, f. 0, g. K, h. Na (p. 29) 26. a.
B) decreased enthalpy of the system. C) increased entropy of the water molecules. D) very strong van der Waals forces among the nonpolar molecules or groups. Answer: C Page Ref: Section 5 29) Water clustered about nonpolar molecules contribute to hydrophobic interactions
Rational knowledge is often derived from syllogisms. Unless both the major and minor premises of syllogisms are sound, the logical conclusions drawn from the rational thoughts are unsound. Scientists cannot rely on rational knowledge alone because rational knowledge involved only form and not content (Jackson, 2009). Empirical knowledge is gained through objective observations and a person’s experience in relation to his or her senses (Jackson, 2009). A person who relies on empirical knowledge only believes what can be detected by his/her senses (sight, sound, taste, etc.).