1.List one extensive and one intensive property of marker ink.
Intensive property is a property that is independent of the amount of sample such as the color of the ink. Extensive property is the opposite which is dependent to the amount such as volume.
2.Define mixture.
Mixture is a system that contains two or more substances which are agitated but not chemically bonded.
3.Is tap water a heterogeneous or homogenous mixture?
Tap water is a homogenoeus mixture because it has uniform properties in every sample you get.
4.Is isopropyl alcohol (rubbing alcohol) a heterogeneous or homogenous mixture?
I think the rubbing alcohol is a homogeneous mixture since it has uniform properties as well.
Tissues and organ systems
Answer: D)The distance from Earth and mass of ISS exert negligible gravitational force on the astronaut.
Explanation:
The distance from Earth and mass of ISS exert negligible gravitational force on the astronaut. Gravity is a very weak force and varies with mass and the inverse square of distance. The astronaut's distance from Earth and the relative small mass of ISS result in gravitational force near zero.
Answer: 7 milimoles of
dissolve in 1 litre water.
Explanation:
Given:
gas is passed through water at 293K.
Assumption :
exerts a partial pressure of 0.987 bar.
Take : Henry's constant
= 76.8 Kbar
![K_H=76800](https://tex.z-dn.net/?f=K_H%3D76800)
To find : Number of moles of
gas dissolve in 1 litre water.
According to Henry's law,
![p_N_2=K_HX_{N_2}](https://tex.z-dn.net/?f=p_N_2%3DK_HX_%7BN_2%7D)
![\Rightarrow\ 0.987=76800X_{N_2}](https://tex.z-dn.net/?f=%5CRightarrow%5C%200.987%3D76800X_%7BN_2%7D)
![\Rightarrow\ X_{N_2}=\dfrac{0.987}{76800}=0.0000128515625\approx1.29\times10^{-5}](https://tex.z-dn.net/?f=%5CRightarrow%5C%20X_%7BN_2%7D%3D%5Cdfrac%7B0.987%7D%7B76800%7D%3D0.0000128515625%5Capprox1.29%5Ctimes10%5E%7B-5%7D)
moles in 1 liter of water = ![\dfrac{1000}{18}=55.56\ [\text{Molar mass of }H_2O=18\ g]](https://tex.z-dn.net/?f=%5Cdfrac%7B1000%7D%7B18%7D%3D55.56%5C%20%5B%5Ctext%7BMolar%20mass%20of%20%7DH_2O%3D18%5C%20g%5D)
Let n= moles of nitrogen
Total moles = 55.56+n
So,
![X_{N_2}=\dfrac{n}{55.56+n}=1.29\times10^{-5}\\\\\Rightarrow\ 55.56\times1.29\times10^{-5}+1.29\times10^5n=n\\\\\Rightarrow\ n- 1.29\times10^5n=0.000714033\\\\\Rightarrow\ 0.999987n=0.000714033\\\\\Rightarrow\ n\approx7\text{ milimoles}](https://tex.z-dn.net/?f=X_%7BN_2%7D%3D%5Cdfrac%7Bn%7D%7B55.56%2Bn%7D%3D1.29%5Ctimes10%5E%7B-5%7D%5C%5C%5C%5C%5CRightarrow%5C%2055.56%5Ctimes1.29%5Ctimes10%5E%7B-5%7D%2B1.29%5Ctimes10%5E5n%3Dn%5C%5C%5C%5C%5CRightarrow%5C%20n-%201.29%5Ctimes10%5E5n%3D0.000714033%5C%5C%5C%5C%5CRightarrow%5C%200.999987n%3D0.000714033%5C%5C%5C%5C%5CRightarrow%5C%20n%5Capprox7%5Ctext%7B%20milimoles%7D)
Hence, 7 milimoles of
dissolve in 1 litre water.