Chapter 76, Problem 3P

Which of the following safety equipment should be utilized to protect a personnel from directly inhaling toxic vapors while observing chemical reactions? fume hood O HEPA filter O air circulator surgical mask

Name: IDENTIFYING CONTROLS & VARIABLES Krusty Krabs Breath Mints Mr. Krabs created a secret ingredient for a breath mint that he thinks will "cure" the bad breath people get from eating crabby patties at the Krusty Krab. He asked 100 customers with a history of bad breath to try his new breath mint. He had 50 customers (Group A) eat a breath mint after they finished eating a crabby patty. The other 50 (Group B) also received a breath mint after they finished the crabby patty; however, it was just a regular breath mint and did not have the secret ingredient. Both groups were told that they were getting breath mint that would cure their bad breath. Two hours after eating the crabby patties, 30 customers in Group A and 10 customers in Group B reported having better breath than they normally had after eating crabby patties. 1. Which people are in the control group? 2. What is the independent variable? nreath ma 3. What is the dependent variable? bed breath 4. What should Mr. Krabs'…

Most of us have had a glass of water from a Brita® pitcher. What is inside of a Brita® filter cartridge and what does it filter out? What doesn’t it filter out?

How to determine the difference between primary , secondary and tertiary alcohol in the laboratory

O Fash point of the given 272 °C=522 °F A flash point that is too low can be a fire hazard and may indicate contamination with Fire point of the given sample 320°C= 608°F more volatile components. Identify one volatile component in a petroleum mixture which may reduce the flash point of the mixture.

doug began preparing laboratory surface disinfectant from chlorine bleach. he put on a chemical resistant apron and gloves and then removed the bleach container from the special chemical cabinet. he carefully placed the container on the laboratory benchtop and began to add the chlorine bleach to distilled water. nearby workers began complaining of burning eyes. doug was reprimanded by the supervisor. Explain why.

What is the E-factor for a synthesis that uses a 8.00 kg reaction mixture to generate 6.00 kg of desired product and 2.00 kg of waste?

Animal fats and vegetable oils become rancid when exposed to air because

12. Polychlorinated biphenyls (PCBS) arc organic mixtures of chlorinated compounds that were once widely used as dielectric and coolant fluids in electrical apparatus. They are now considered to be persistent organic pollutants * Figure 1 shows an example of PCB: 2,2',4,4-tetrachlorobiphenyl(PCB-47). CI CI Cl CI Figure 1 What is the m/z value of the most abundant molecular ion peak in a mass spectrum of PCB-47? [Chlorine exists as two isotopes, "Cl and "CI ; relative atomic mass C,12.0; H,1.0; CL 35.5] A. 290 В. 292 С. 294 D. 298