hw chapter 12 (1)

2. In case of an accident in the classroom, who should be notified immediately? 3. Why is it a safety procedure to tie back long hair in the laboratory? 4. Why should a student not eat or drink in the laboratory? 5. Why should any spills be reported and cleaned immediately? 6. Why should you wash your hands after every laboratory period? 7. Why is rough play in the laboratory dangerous? 8. When would the wearing of safety goggles be a proper procedure? 7

The first few drops of the distillate called foreruns are discarded.This is a good practice because   Question options:   foreruns are contaminated by a dirty glassware   foreruns contain low boiling impurities       sacrificing foreruns has been a tradition for ages of distillation practice   foreruns always contain water from moisture

Which of the following statements is not true?   a. It is okay to taste a chemical   b. No food or drink, including water, is allowed in laboratory   c. Read and re-read labels on containers of chemicals before opening them   d. Dispose the chemical waste to appropriate waste container

Before slow cooking a meat (for example, in a crockpot/slow-cooker) you will often find instructions to sear the meat on high heat in an oiled skillet for a few minutes before transferring it to the crockpot. The searing is brief – not long enough to cook the meat thoroughly. Despite myth/legend, the searing will not “seal in the juices”. What is the searing for?

Please answer question and give a brief explination why

Pick one to respond to. Why does salt added to a road before snow help but salt added after snow do nothing? or Why is salt added to boiling water when cooking?

1. Put some water in your cup. 2. Sprinkle black pepper all over the surface. What does the pepper do? Write your observation 3. Add a drop of dish soap to the water. What does the pepper do? Write your observation

1. One common chemical contaminant that is removed from water during water treatment. How is it removed and why? Include chemical formulas and chemical reactions. 2. One chemical that is added to water during water treatment. How is it added to water and why? Include chemical formulas and chemical reactions.

Design/demonstrate an experiment from the mixtures given in every item. Record your work then pass here (google classroom) 1. How do you separate a mixture of a. salt and sand? b. Cornstarch in water ? C. Ground mongo seed in water d. Ground pepper and sand

List 4 things to be considered when determining the type of irrigation system to use. a. b. c. d.

STANDARD SAMPLE PREPARATIONS FOR ABSORBANCE & CONCENTRATION DATA Concentration of stock nickel sulfate hexahydrate solution = .400 Molarity Sample Volume Absorbance Concentration (In Molarity) a 5 mL .179 10 mL .329 15 mL .588 20 mL .760 25 mL .939 Reference Blank = 0 Please show how to find Molarity, please show steps. Thank you and stay safe.

If a single dose of azithromycin for oral suspension for a 1.5 years old child is 125 mg. Calculate the volume of oral suspension, in mL, that should be administered for each dose of a 200-mg/5-mL suspension.