Osmosis is the movement of water from high concentration to low concentration while diffusion is the net of movement of gases from high concentration to low concentration
Mmm, you can work this one out in your head by reversing it.
<span>12.5 = 50g/4 </span>
<span>1/4 = 1/2 * 1/2 </span>
<span>thus in 14.4 seconds there have been 2 times the half life. 14.4/2 = 7.2 </span>
<span>the half life is 7.2 seconds.</span>
Answer:
Mass of CO2 = ? Thus, the mass of 2.2x10^9 molecules of CO2 is 9.68 x 10^10 grams.
Explanation:
Answer:
374°F
463.15K
Explanation:
This particular Question wants to test knowledge on the conversion of the units of temperature from celsius degree to degree Fahrenheit. Also, the conversion of degree celsius to kelvin.
The value given which is 190 degree celsius can be converted into degree Fahrenheit using the formula below;
(x°C × 9/5 ) + 32.
Therefore, x = 190°C =( 190°°C × 9/5) + 32 = 374°F.
The conversion of degree celsius to kelvin is given below as;
x°C + 273.15 .
Therefore, x = 190°C = 190°C + 273.15 = 463.15K.
Therefore, the temperature needed to bake at Fahrenheit and kelvin are 374°F and 463.15K respectively.
Answer:
![\boxed{\text{8 da}}](https://tex.z-dn.net/?f=%5Cboxed%7B%5Ctext%7B8%20da%7D%7D)
Explanation:
The question will be easier to solve if we interpret it as, " How long will it take until one-fourth of a sample of the element remains,?"
The half-life of the element is the time it takes for half of it to decay.
After one half-life, half (50 %) of the original amount will remain.
After a second half-life, half of that amount (25 %) will remain, and so on.
We can construct a table as follows:
![\begin{array}{cccl}\textbf{No. of} & & \textbf{Fraction} & \\\textbf{half-lives} & \textbf{t/da} & \textbf{remaining} & \\1 & 4 & \dfrac{1}{2} & \\\\2 & 8 & \dfrac{1}{4}& \\\\3 & 12 & \dfrac{1}{8}& \\\end{array}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7Bcccl%7D%5Ctextbf%7BNo.%20of%7D%20%26%20%26%20%5Ctextbf%7BFraction%7D%20%26%20%5C%5C%5Ctextbf%7Bhalf-lives%7D%20%26%20%5Ctextbf%7Bt%2Fda%7D%20%26%20%5Ctextbf%7Bremaining%7D%20%26%20%5C%5C1%20%26%204%20%26%20%5Cdfrac%7B1%7D%7B2%7D%20%26%20%5C%5C%5C%5C2%20%26%208%20%26%20%5Cdfrac%7B1%7D%7B4%7D%26%20%5C%5C%5C%5C3%20%26%2012%20%26%20%5Cdfrac%7B1%7D%7B8%7D%26%20%5C%5C%5Cend%7Barray%7D)
![\text{We see that 8 da is two half-lives, and the fraction of the element remaining is $\frac{1}{4}$.}\\\text{It takes $\boxed{\textbf{8 da}}$ for three-fourths of the element to decay}](https://tex.z-dn.net/?f=%5Ctext%7BWe%20see%20that%208%20da%20is%20two%20half-lives%2C%20and%20the%20fraction%20of%20the%20element%20remaining%20is%20%24%5Cfrac%7B1%7D%7B4%7D%24.%7D%5C%5C%5Ctext%7BIt%20takes%20%24%5Cboxed%7B%5Ctextbf%7B8%20da%7D%7D%24%20for%20three-fourths%20of%20the%20element%20to%20decay%7D)