The answer here is D - bases tend to feel slippery. This is because they tend to dissolve oils on your skin, reducing the friction between your fingers or hands when you rub them together.
The average kinetic energy of colliding particles can be increased by increasing temperature.
B.
Radio active decay reactions follow first order rate kinetics.
a) The half life and decay constant for radio active decay reactions are related by the equation:
![t_{\frac{1}{2}} =](https://tex.z-dn.net/?f=%20t_%7B%5Cfrac%7B1%7D%7B2%7D%7D%20%3D%20%20%20)
![\frac{ln 2}{k}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bln%202%7D%7Bk%7D%20%20)
![t_{\frac{1}{2}} = \frac{0.693}{k}](https://tex.z-dn.net/?f=%20t_%7B%5Cfrac%7B1%7D%7B2%7D%7D%20%3D%20%5Cfrac%7B0.693%7D%7Bk%7D%20%20%20%20)
Where k is the decay constant
b) Finding out the decay constant for the decay of C-14 isotope:
![Decay constant (k) = \frac{0.693}{t_{\frac{1}{2}}}](https://tex.z-dn.net/?f=%20Decay%20constant%20%28k%29%20%3D%20%5Cfrac%7B0.693%7D%7Bt_%7B%5Cfrac%7B1%7D%7B2%7D%7D%7D%20%20%20%20)
![k = \frac{0.693}{5230 years}](https://tex.z-dn.net/?f=%20k%20%3D%20%5Cfrac%7B0.693%7D%7B5230%20years%7D%20%20)
![k = 1.325 * 10^{-4} yr^{-1}](https://tex.z-dn.net/?f=%20k%20%3D%201.325%20%2A%2010%5E%7B-4%7D%20yr%5E%7B-1%7D%20%20%20)
c) Finding the age of the sample :
35 % of the radiocarbon is present currently.
The first order rate equation is,
![[A] = [A_{0}]e^{-kt}](https://tex.z-dn.net/?f=%20%5BA%5D%20%3D%20%5BA_%7B0%7D%5De%5E%7B-kt%7D%20%20%20)
![\frac{[A]}{[A_{0}]} = e^{-kt}](https://tex.z-dn.net/?f=%20%5Cfrac%7B%5BA%5D%7D%7B%5BA_%7B0%7D%5D%7D%20%3D%20e%5E%7B-kt%7D%20%20)
![\frac{35}{100} = e^{-(1.325 *10^{-4})t}](https://tex.z-dn.net/?f=%20%5Cfrac%7B35%7D%7B100%7D%20%3D%20e%5E%7B-%281.325%20%2A10%5E%7B-4%7D%29t%7D%20%20%20%20)
![ln(0.35) = -(1.325 *10^{-4})(t)](https://tex.z-dn.net/?f=%20ln%280.35%29%20%3D%20-%281.325%20%2A10%5E%7B-4%7D%29%28t%29%20%20)
t = 7923 years
Therefore, age of the sample is 7923 years.
Answer:
11.647g of water may be produced.
Explanation:
chemistry of the reaction:
2O2 + 2H2 ----> 2H2O + O2
64g + 4g yields 36g of water,
20g + 2g yields 11.647058824g of water
Answer:
<h3>The answer is 30 cm³</h3>
Explanation:
The volume of a substance when given the density and mass can be found by using the formula
![volume = \frac{mass}{density} \\](https://tex.z-dn.net/?f=volume%20%3D%20%20%5Cfrac%7Bmass%7D%7Bdensity%7D%20%5C%5C)
From the question
mass = 180 g
density = 6 g/cm³
We have
![volume = \frac{180}{6} \\](https://tex.z-dn.net/?f=volume%20%3D%20%20%5Cfrac%7B180%7D%7B6%7D%20%20%5C%5C%20)
We have the final answer as
<h3>30 cm³</h3>
Hope this helps you