hunter007

Given the cyclohexane framework in a chair conformation, label each position as axial (ax.) or equatorial (eq.).

1. Python programming for beginners 

I need to collect information and to write a full description for the following components related to composite combination of “polyvinyl alcohol (PVA) and gelatin”topic related to “Skin tissue engineering/Wound healing”: as the following

Abstract –

Chemical structure and properties –

Common uses –

Mechanical properties –

Swelling and degradation properties –

Porosity –

Scaffold fabrication methods –

Advantages and disadvantages –

Conclusion –

References (in a separate page, no upper limit for citing references, use standard journal formatting for references) – 5 pts

1. I have to write about how the song the star-spangled make me feel

1. And I have to provide three adjectives

How might humans have influenced the inheritance of traits they found desirable in wolves?

This is worksheet 3 from my NAT101 course. i need help with the questions pls 

Directions: Balance the following equations.

1. NaCl + _ _BeF2 —------> ___NaF +___ BeCl2
2. FeCl3 +___Be3(PO4)2 —-----> ___BeCl2 +___FePO4
3. AgNO3 +___LiOH —--> ___AgOH + ___LiNO3
4. CH4 +___O2 —-----> ___CO2 +__ H2O
5. Mg + ___Mn2O3 —---> __ MgO +_ _Mn
6. AlBr3 +___K —--> ___KBr +___Al
7. FeO +___PdF2 —----> ___FeF2 +___PdO
8. P4 +___Br2 —-----> ___PBr3
9. LiCl +___Br2 —------> ___LiBr +___Cl2

10. PbBr2 +___HCl —--> ___HBr +___PbCl2

Explain two reasons why knowing the LD50(lethal dose 50) value is not useful for someone working with a chemical in a lab or being exposed to a toxin? 

Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.2 L of water upon warming from 25 °C to 50 °C. Assume that the water is initially saturated with nitrogen and oxygen gas at 25 C and a total pressure of 1.0 atm. Assume that the Gas bubbles out at a temperature of 50 ° C. The solubility of oxygen gas at 50 ° C' is 27.8 mg /L at an oxygen pressure of 1.00 atm. The solubility of nitrogen gas at 50 ° C is 14.6 mg / L at a nitrogen pressure of 1.00 am. Assume that the air above the water contains an oxygen partial pressure of 0.21 atm and a nitrogen partial pressure of 0.78 atm

Express your answer using two significant figures.