Exam 1 chapters 1_4 Study Guide

1. What are fibers and where are they found? How could forensic scientists use fibers to solve a crime?   2. Define the word probative. What is the probative value of a fiber in a forensic investigation?     3. Describe steps you would take from collecting a fiber(s) at a crime scene to performing an analysis to determine its identity.     4.  Which of the 6 fiber types you observed are natural? Which are man-made?     5.  Are fibers classified or individualized? Why?

Part A: The graphic shows an organic molecule and highlights a functional group that is bonded to it. This functional group is an example of ______ group. Part B: select which Characteristic this functional group impacts on the molecule. A. Forms disulfide bonds B. Nonpolar

Note: no need for explanation, just answer it all with letters. Thank you

The phrase "Benign by design" is often associated with green chemistry. In your own words, what does this phrase mean in relation to green chemistry?

What is the purpose of Safety Data Sheets? Why are these important when handling common food service chemicals? What information/components are generally included? How do Safety Data Sheets vary?

Which of the following is true about heavy metals and their environmental impact? a. Coffee and tea waste could be viable options to rid water of heavy metals. b. Based on the study shown in class, coffee is definitively the best option to rid heavy metals from water. c. Coffee, tea and caffeine all remove heavy metals from contaminated water through absorption. d. Copper is the most prevalent metal found in drinking water that can cause harm to the environment and humans. e. Copper and zinc concentrations in drinking water are significantly higher in areas with human activity.

4) The following figure is a type of molecule found in nature. What type of molecule is it? Please label the parts and then answer the following questions about the molecule. Name/Part: H,C-O HC 12 15 H,C–O a 1 Methylene Name/Part: a) What is the name of the entire molecule that is seen above? Triglyceride molecule b) What specific type of this molecule is seen above? (What is the number one referring to?) glycerol and three fatty acids (The number 1 referring to the position of double bond between carbon k and k+1 counted from 1 at the end. d) What class or group of biological macromolecules does the above figure belong to? It belongs to the lipids (fat or oil)

Please answer the following question:

what types of content that we can discuss on this topic? "non-stick cooking utensils- are they safe for us"

Determine whether the statements are true or false and could you please leave a short explanation in order for me to understand? Thank you so much! 1. Vitamins are useful in the body in great amounts.2. Vitamins don't have a common sturcture3. There is one type of vitamin B.4. Vitamin D is usually found in citrus fruits.5. There are vitamins that can be produced by the skin with the aid of sunlight.6. Vitamin K can solve fertility problems.7. Some vitamins can be synthesized by the human body.8. Before taking multivitamins, consultation with a doctor is important.9. All vitamins are water-soluble.10. Too much vitamins may be toxic to the body.

Place the correct term in the blanks to properly complete the paragraph. allograft autograft xenograft pig valve cadaver An is taken from the patient; an can come from another person. Donor skin can come from skin banks, which acquire skin from a .A is from another species, not human. An example of this would be a for the heart.

Find this chemist Bertram Fraser Red Where did this chemist study? Where have they spent their careers? What has this chemist done research/work/teaching? Why is their research/work important?

I'm taking a practice test and I'm having some trouble and was hoping you could help.  This is not graded I just need help See attached:

Arrange these substance according to how many drops we could add to a penny before the "bubble" popped, FEW DROPS (left-most) to MANY DROPS (right-most). The description labels on the images are small, so use the following legend to identify the materials: A: vegetable oil B: motor oil C: dish soap D: syrup E: honey A CITE EVIDENCE from your Learning Experience and provide REASONING for why you arranged these substances in this order.

Please help me with number eight I don't understand it. Please note I am 60 years old trying to help my son learn chemistry and this is not a test.

Calculate the cost per individual molecule of your pain reliever. Acetaminophen has the chemical formula C8H9NO2. Ibuprofen has the chemical formula C13H18O2. Paracetamol has the chemical formula C8H9NO2.

Choose the correct term from the enclosed choices that should go into the blank spaces. Cosmetics are composed of different ingredients that marketable quality. ensure function and maintain (1). ingredients are the chemicals that perform the main (Functional/Supportive) function of the cosmetic product. Those chemicals that improve the shelf life of the product (supportive/structural) (functional/added extra) are chemicals in small amounts are called (2) ingredients. (3). that make the product more presentable and marketable to the consumers. Antioxidants and (4) (abrasives/preservatives) lengthen the shelf life of a product. (5) (Astringent/Exfoliant) can be found in whitening products because it can remove dead skin cell layers. The cosmetic ingredient that can prevent the separation of oil and water in the emulsion is called (6) agent/emulsion stabilizer). (7)_ (emulsifying (Chelating agent/Opacifying agent) prevents the deterioration of the foam and binds ions in the hard water.…

Choose your answer on the words/terms written inside the box. Note: answers may repeat Preservatives Nitrites Food additives Chemical Preservatives Benzoic acid Sweeteners Sorbates salt Sodium nitrites Natural Preservatives Benzoates 1. Substance that improves the quality and safety of food. 2. Chemical that is added to food or beverages to prevent microbial growth or to avoid spoilage. 3. These act by killing bacteria and other microorganisms present in foods especially in acidic conditions. 4. Type of food preservatives that kills disease causing bacteria. _5. An antimicrobial agent preservative that inhibits the growth of molds, yeast and bacteria in food. _6. A traditional and natural preservative. 7. Two main types of preservatives. 8 9. Responsible for the pink color of hot dogs and hams 10. These preservatives are used in salad dressings and pickles. 11. Any substance added to food to increase the shelf value of food for storage. 12. Preservatives used in baked goods, canned…

Your partner left his table with a lot of containers containing chemicals. Some of these chemicals aren't labeled. What would you do with the chemicals that are not labeled?

Concentrated sulphuric acid is used in this experiment to O help the crystal growth of acetylsalicylic acid speed up the reaction of aspirin synthesis increase the activation energy O avoid impurities getting trapped into the aspirin crystals P Type here to search

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Everything in the world is made of matter. Matter is anything that takes up space, including us! The matter you see can be describe by shape, color, flexibility, hardness and texture (the way it feels). Explain this.What type of matter is most suited to build bridges? Why?What type of matter is most absorbent? How do you know?What type of matter is more suitable to build wheels from? Why do you think so?What types of matter do we eat?

Like anatomy and physiology, chemistry may be a somewhat scary subject for you. Think of it this way: Chemistry is simply the study of matter, its composition, structure, properties, and the changes matter may undergo. Your goal in training as a cosmetologist is not to become a scientist, but to develop a comfort level with the basics and an ability to discuss chemistry in relation to your profession. This will increase your credibility significantly with your clients, especially during the consultation process. In the space provided, write how chemistry affects your everyday life.

classify the elements according to their role in biological system (400 words)

3. What are volatile chemicals? A. Chemicals that exist as gases at ambient conditions (room temperature and pressure) B. Chemicals that are very reactive. C. Chemicals that can evaporate easily at ambient conditions. D. Chemicals that are liquids at ambient conditions.

Can two samples that have different sets of chemical elements be the same mineral? Why or why not? Can two samples that have different atomic arrangements be the same mineral? Why or why not?

Define the following classification of chemicals. Give at least three examples each. a. special- purpose reagent chemicals b. Food grade chemicals