Answer:
To the best of my knowledge, it is because of the amount of gamma rays is given off.
Explanation:
While both are isotopes, Potassium 40 gives off fewer gamma rays compared to Cobalt 60. Potassium 40 isn't really harmful to humans, but Cobalt 60 (I believe) is used in chemotherapy.
1 kg/L -------------- 0.001 kg/mL
22.4 kg/L --------- ??
22.4 x 0.001 / 1 => 0.0224 kg/mL
Chemical because the first thing disappeared and changed into something completely different. Because you got something new from what you started with, it is chemical.
Idk why its pumpkin spice latte but I'm not going to judge. I prefer drinking bleach.
Answer:
A). Calcium chloride dihydrate (CaCl2 * 2H2O) slowly heated in a crucible to become calcium chloride (anhydrous).
Dehyration is a physical process
B). A hydrocarbon such as propane (C3H8) undergoes combustion to power a grill
Combustion is a chemical process.
C). A rock climber’s rope becomes frayed and turns the color of the rocks
This is physical process
D). A dog urinates on an air conditioner coil and the coil becomes corroded
Corrsion is a chemical process.
Explanation:
First, we convert the pressure in kPa to atm. That is,
(215 kPa) x (1 atm/ 101.325 kPa) = 2.122 atm
Then, determine the amount of carbon (C) in mol by assuming that it is an ideal gas.
n = (2.122 atm)(75 L) / (0.0821 L.atm/mol.K)(-25 + 273.15)
n = 7.81 mols
The reaction is expressed as,
4KO2 + 2CO2 --> 2K2CO3 + 3O2
From the equation,
(7.81 mols CO2) x (4 mols KO2/2 mols CO2) = 15.62 mols KO2
