Which of the following changes should improve water solubility? A. adding a methyl group B. adding a hydroxyl group C. adding a carboxyl group D. increasing the size of the drug E. adding a benzene ring
Answers
Answer:
B. adding a hydroxyl group C. adding a carboxyl group
Explanation:
Solubility in water is due to the polar interactions or the hydrogen bonding.
Methyl group and benzene ring are both polar and hydrophobic in nature and thus will not improve water solubility.
Increasing size of drug will make more insoluble as more size of the solute is being added.
Adding hydroxyl or carboxyl group can improve water solubility as both the groups are highly hydrophilic and polar. These groups can form hydrogen bond with the water molecules and make drug more soluble in the water.
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(1) factory workers from the Northeast to the
Sun Belt
(2) communists deported to Russia as
undesirable aliens
(3) African Americans to northern cities to find
work
(4) refugees fleeing from eastern Europe to the
United States
Answers
The Great Migration during World War I refers to the movement of African Americans to northern cities to find work. Therefore, option (3) is correct.
What is Great migration?
The Great Migration was the movement of millions of African Americans moved from the rural Southern United States to the urban Northeast, Midwest, and West. The great migration was caused by the poor economic conditions for African American people.
The historic change brought by the migration was fueled because the migrants moved to the largest cities in the United States such as New York City, Chicago, Los Angeles, Philadelphia, Cleveland, and Washington, D.C. at a time when these cities had a central social, political, cultural and economic influence over the United States.
African Americans established effective communities of their own. Therefore the Great migration movement was actually sending African Americans to northerncities to find work.
Learn more about Great migration, here:
#SPJ2
Answers
smaller volume > crowded particles > more collisions > higher pressure
Answers
0.75 mol sucrose dissolved in 1000 g water
1.0 mol ethylene glycol dissolved in 1000 g water
0.50 mol CaCl2 dissolved in 1000 g water
0.25 mol NaCl dissolved in 1000 g water
Answers
ΔT(CaCl2) = i x K x m = 3 x 0.52 x 0.25 = 0.39 °C
ΔT(Sucrose) = 1 x 0.52 x 0.75 = 0.39 °C
ΔT(Ethylene glycol) = 1 x 0.52 x 1 = 0.52 °C
ΔT(CaCl2) = 3 x 0.52 x 0.50 = 0.78 °C
ΔT(NaCl) = 2 x 0.52 x 0.25 = 0.26 °C
Thus, from the calculated values, we see that 0.75 mol sucrose dissolved on 1 kg water has the same boiling point with 0.25 mol CaCl2 dissolved in 1 kg water.
Answers
Examples of gases that can be found at home include carbon monoxide, chlorine, ammonia, hydrogen, nitrogen, and sulfur oxides.
- Gas is one of the three states of matter that we've. A gas simply means a substance that doesn't have a fixed shape and fixed volume.
- It should also be noted that gases have lower density when compared to solid or liquid. There are different gases such as oxygen, nitrogen, helium, carbon monoxide, etc.
- Examples of gases found at home include carbon monoxide, chlorine, ammonia, hydrogen, nitrogen, and sulfur oxides.
In conclusion, carbon monoxide is gotten when we burn wood, charcoal, fuel, etc.
Read related link on:.
2. Steam
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4. Dry ice
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Answers
Answer: The volume of liquid used will be 18.055 mL.
Explanation:
To calculate the volume of liquid, we use the equation for density which is:
We are given:
Mass of the liquid = 26 g
Density of the liquid = 1.44 g/mL
Volume of the liquid = ? mL
Putting values in above equation, we get:
Hence, the volume of liquid used will be 18.055 mL.
Mass = 26.0g
Density = 1.44g/mL
Therefore Volume = Mass/Density
=> Volume = 26.0/1.44 = 18.055... = 18.1mL (to 3 sig figs)