Nobelium discovered in Berkeley California
First find the number of moles of KSCN is in 4.40g of KSCN
1. Number of moles = mass given (4.40g) / molecular weight(MW) (KSCN)
- to calculate MW, look for each element in the periodic table and add their atomic weight
2. Convert 200mL to liters
3. Concentration = number of moles/ volume in liters from (#2)
1. Color changes.
The Statue of Liberty, though known for its green color, was originally covered in a layer of copper. After a redox (reduction-oxidation reaction) the color changed due to a chemical change.
2. Gas Production
3. Light Produced
Light sticks work as the result of a chemical reaction between hydrogen peroxide and phenol oxalate ester.
4. Temperature Changes
5. Volume Change
<u>Answer:</u> The concentration of 
ions are 2.797 ppm and 0.212 ppm respectively.
<u>Explanation:</u>
To calculate the mass of solution, we use the equation:
Volume of gold = 100 L = 100000 mL (Conversion factor: 1 L = 1000 mL)
Density of gold = 1.001 g/mL
Putting values in above equation, we get:
To calculate the concentration in ppm (by mass), we use the equation:
- <u>Calculating the concentration of calcium ions:</u>
Mass of 
ions = 0.280 g
Putting values in above equation, we get:
- <u>Calculating the concentration of magnesium ions:</u>
Mass of 
ions = 0.0220 g
Putting values in above equation, we get:
Hence, the concentration of ions are 2.797 ppm and 0.212 ppm respectively.
1. %yield = actual yield / theoretical yield x 100
= 3 g / 4. 46 g x 100
= 62.11 % percent yield
Hope This Helps! :3
