Week 3 - Discussion

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?

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?

The Covid-19 pandemic has many experts commenting on the science associated with the virus - origins, vaccines, monoclonal antibodies, masks, social distancing.  It is important to consider what the experts say, but to also evaluate their statements.  We will start with the scientific method.  I want you to outline the scientific method from what you have been taught in previous classes.  You can list steps, parts, process, short descriptions, whatever.  If not taught in previous classes, then you will make your best guess about it.

1)Which one of the following statements is not true about ways materials can be smart? React when exposed to all media React when exposed to only specific media Separate substances Recognize certain molecules Bind to certain molecules   2) Select all correct statements about Catalysts a-They breakdown and enter chemical reactions and get consumed b-They assist chemical reactions but do not get consumed c-Biological catalysts are enzymes in the body d-enzymes facilitates the breakdown of starch into simple sugars e-Catalyst is a substance that performs cathalicism f-catalyst is a section of the exhaust that is connected to tube where the tail pipes and header   3)Which following statements is not true about Nano-Sieves -Chemical Reactivity can be related to surface area -More surface area = more sites for molecules to bind, interact and react -Breaking blocks into smaller chunks and then into small particles increases surface area -As particle size…

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

Some greenhouse gases, such as fluorocarbons (CFCs, HFCs, PFCs, etc.), are human-made. Others, such as water, methane, and carbon dioxide, are naturally produced. Which type of greenhouse gas (human-made or natural) is more difficult to control and eliminate? Which types are easier? In three to five sentences, provide evidence for your argument.

For Q6. I am uncertain on how 20.49 is the answer because I thought we’d use the figure with least sig figs which is 1 sig fig in this problem. I’m confused on why it’s 4 sig figs in the answer.

three groups: physical, emotional, and physiological. choose one of these groups and profile a person (real or imagined) who has a disability from that group. Describe the disability. To which group(s) does it belong? What are its effects on the person you are profiling? Explain some of the challenges that this person has to overcome to function in everyday society. Remember to respond to two of your classmates’ initial posts with your own opinions and ideas.

What is calibration and why is it essential in relation to food analysis? Provide examples.

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of carbon tetrachloride, diethylamine, methyl acetate, tetrahydrofuran, and acetone.   The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information:

Rsimi, Nour 2023VVA Chemistry.7b.FA1 An unknown solid substance is heated according to the temperature versus time graph below. Temperature (°C) 70 40 30 20 288 8 2 0 0 5 15 Time (min) 20 00 4 of 5 1 2 3 4 5 25 While the substance is a liquid, at what temperature do the molecules of the substance have the greatest average kinetic energy? 2 % 3 4 5 16 7 8 insert

Which of the following best define systems thinking in chemistry? Systems thinking is learning about chemistry within real-word contexts. Systems thinking focuses on the interdependence between chemistry components, as well as the influence of chemistry on other systems. Systems thinking is a way of thinking about chemistry systematically.

Electrical power is commonly measured in watts (W) or in kilowatts (kW). A commercial solar panel generates about 0.10 watts per square inch of surface area. Based on this, how many kilowatts of power could be generated by a residential solar panel array with a surface area of 621 ft2? amount of power: kW

Importance of Chemistry in Human Life؟

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.

Which branch of chemistry would be the most relevant to a learner that plans on becoming a nutritionist? A physical chemistry B C D biochemistry inorganic chemistry nuclear chemistry