Dependent could be the amount of water, the time that you are using in the u tube. Independent could be the amount of hydrogen and oxygen gass.
Remember, dependent variable is something that you control or measurement. Like for example. You have 2 different tubes one with 5ml of water and the other one with 10ml.
Independent something you cannot control. Like the amount of light can a plant receive or how much long it will take water to boil depending on the how high the fire is
The % yield of Hf is 91. 8%
calculation
% yield = actual mass/ theoretical mass x100
actual mass = 2.85 Kg
calculate the theoretical mass
by first write the equation for reaction
CaF2 +H2SO4 → 2HF + CaSO4
find the moles of CaF2 used
moles = mass/molar mass
mass = 6.05Kg = 6.05 x1000 =6050 Kg
molar mass of CaF2 = 40 + (19 x2) = 78 g/mol
moles= 6050/ 78 = 77.6 moles
by use of mole ratio between CaF2 to HF which is 1:2 the moles of HF is therefore = 77.6 x2 =155.2 moles of Hf
find the theoretical mass of HF = moles x molar mass ( 1 +19=20g/mol)
= 155.2 moles x 20 g/mol = 3104 grams = 3104 /1000 = 3.104 Kg
The % yield is therefore = 2.85 Kg/ 3.104 Kg x100 = 91.8%
Answer: there are three different methods of determining the age of a landform.
1 radiation measurement
2 stratigraphic superposition
3 the fossil record
by using these or a combination of these they determined that the earth is around 4.6 billion years old. and this is where the big bang theory comes into play.
Answer:Ethanol can be made by a process called fermentation. During fermentation, sugar (glucose) from plant material is converted into ethanol and carbon dioxide. ... 90 per cent of the world's ethanol is made using fermentation.
Explanation:
The chemical formula of nickel (ii) hypochlorite is Ni(CIO)2. Nickel (II) has a charge of +2 while (CIO-) which is a poly atomic ion of chlorine and oxygen has a charge of -1. After balancing the charge of nickel with that of CIO- you get the chemical formula as Ni(CIO)2.
