Question Chemistry And Biology Assignment

09 Jun Question Chemistry And Biology Assignment

Question
Chemistry And Biology Assignment

CHEM-Assignment03:

1. What are the names and formulas of the conjugate bases of these acids:

(a) HNO2 ______ ______ ______ ______ ______

(b) H2SO4 ______ ______ ______ ______ ______

(c) H2S ______ ______ ______ ______ ______

(d) HCN ______ ______ ______ ______ ______

(e) HCOOH ______ ______ ______ ______ ______

2. Compare the strengths of the following pairs of acids:

(a) H2SO4 ______ H2SeO4, (b) H3PO4 ______ H3AsO4

.3. Write the expressions for the equilibrium constants KP of these thermal decompositions:

image1.emf

(a) 2Na HCO

3

(s) Na

2

CO

3

(s) + CO

2

(g) + H

2

O(g)

image2.emf

(b) 2Ca SO

4

(s) 2Ca O(s) + 2SO

2

(g) + O

2

(g)

4. Predict whether the following reactions would occur spontaneously in aqueous solution at 25 0C. Assume that the initial concentrations of dissolved species are all 1.0 M.

(a) Ca(s) + Cd2+ (aq) → Ca2+ (aq) + Cd(s)

(b) 2Br -(aq) + Sn2+ (aq) → Br2(l) + Sn(s)

(c) 2Ag(s) + Ni2+ (aq) → 2Ag+ (aq) + Ni(s)

(d) Cu+(aq) + Fe3+(aq) → Cu2+ (aq) + Fe2+(aq)

5.Calculate the molality of each of the following aqueous solutions: (a) 2.50 M NaCl solution (density of solution=1.08 g/m L), (b) 48.2 percent by mass KBr solution.

_1620648543.cdx

_1620648576.cdx

Bio-Assignment03:

1. True or False

(i) Only plants can gather energy from sunlight and use this energy to make carbohydrates. . Answer:___________

(ii) Humans are susceptible to HIV and most other animals are not.

Answer:___________

2. Name the following words:

Autotrophs:

The nitrogen cycle:

3. How does the removal of GABA produce more dopamine?

4. Among humans, who is susceptible to HIV infection?

5. Why does the risk of antibiotic resistance rise if people do not finish taking all of their antibiotic pills?

6. Which has greater biodiversity, a habitat in which there are 1500 resident species, most of which are procaryotes, or a habitat in which there are 1500 species, most of which are plants?

7. What biome is your college located in? Where on the globe are comparable biomes located?