Since the half-life is 4.5 billion years, two half-lives would have elapsed after 9 billion years.
<span>If you start with 400 g, half decays during the first half-life, leaving 200 g. </span>
<span>During the second half-life, half of the 200 g decays, leaving 100 g.</span>
Answer:
The correct option is: (C) It included negatively charged particles.
Explanation:
Sir Joseph John Thomson proposed an atomic model, known as the plum pudding model in 1904.
In this model, he<u> compared an atom to a plum pudding</u> and suggested that the <u>negatively charged electrons are the plums that are embedded in a uniform positively charged spherical pudding.</u>
Therefore, according to the plum pudding model, <u>an atom has no net electric charge</u> and <u>contains negatively charged electrons.</u>
Answer:
1.25 M HCO₃⁻ / 1.25 M CO₃²⁻
Explanation:
Buffer capacity refers to the amount of a strong acid or base required per liter of the buffer to change its pH by one. This amount is directly related to the concentration of the conjugate acid-base pair in the buffer since the buffer pair neutralizes the strong acid or base.
Thus, the highest buffer capacity is found in the solution that has the highest concentration of the conjugate acid-base pair, which is 1.25 M HCO₃⁻ / 1.25 M CO₃²⁻
.