<u>Answer:</u> The balanced nuclear equation for the alpha decay of Sr-90 is 
<u>Explanation:</u>
A nuclear reaction is defined as the reaction in which the changes in the nucleus of an atom take place and usually form a different element. The types of decay processes are:
- Alpha decay
- Beta-decay
- Gamma decay
Alpha decay is the process in which a heavy nucleus decays into a light nucleus with the release of an alpha particle. This alpha particle carries a charge of +2 units and has a mass of 4 units. It is also known as the helium nucleus. The general equation for this decay process is:
The nuclear equation for the alpha decay of strontium-90 isotope follows:
Answer:
The composition of a pure substance is always the same, regardless of the source, but the composition of a mixture can vary.
Mixtures can be separated into their components by physical changes; some pure substances can be separated into components by chemical change.
Explanation:
A chemically pure substance has a well defined and constant composition. The composition of a chemically pure substance remains the same irrespective of its source. Also, the components of a chemically pure substance may be separated by chemical changes.
Mixtures have a variable composition depending on their respective sources. The composition of a mixture varies with the source of the mixture and mixtures are separated by physical processes.
The correct answer would be D.8
Answer:
The Ksp for this compound is 3.24 * 10^-8
Explanation:
Step 1: Data given:
Molar solubility of MgCO3 = 1.8 * 10^-4 mol /L
Step 2: Calculate molarity
For an insoluble compound, its molar solubility tells you how many moles of the compound can be dissolved per liter of aqueous solution before reaching saturation.
In this case, it means that we can only dissolve 1.8 * 10^-4 moles in a liter of water at that temperature.
Moles Mg^2+ = 1.8 * 10^-4 moles
Moles CO3^2- = 1.8 * 10^-4 moles
Since we're working with one liter of solution, we can say the molarity:
[Mg^2+] = 1.8 * 10^-4 M
[CO3^2-] = 1.8 * 10^-4 M
Step 3: Calculate Ksp
Ksp = [Mg^2+]*[CO3^2-]
Ksp = 1.8 * 10^-4 * 1.8 * 10^-4
Ksp = 3.24 * 10^-8
The Ksp for this compound is 3.24 * 10^-8
