Answer:
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
Explanation:
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<u>Answer:</u> The amount of element X remain after 40 years is 18.75 grams
<u>Explanation:</u>
We are given:
Total time period = 40 years
One half life = 10 years
Calculating the number of half lives,
To calculate the amount of element X after 4 half lives, we use the equation:
where,
a = amount of X after n-half lives
= initial amount of X = 300 g
n = number of half lives = 4
Putting values in above equation, we get:
Hence, the amount of element X remain after 40 years is 18.75 grams
Muhammad was the founder of Islam
Answer:
640 balloons
Explanation:
When filling the balloon, the pressure of helium will be equal to the atmospheric pressure (the system must be in equilibrium with the surroundings). So, by Boyle's law we can calculate how many liters are necessary for the pressure of the tank:
P1*V1 = P2*V2
P1 is the pressure of the tank, V1 is the volume of the gas leaving the tank, P2 is the pressure in the balloon, and V2 the volume of the balloon.
160*V1 = 1*3
V1 = 0.01875 L of helium for each balloon
So, if there is 12 L in the tank, it would be possible to fill:
12/0.01875 = 640 balloons.