The last question depends on the scientific method.
Scientific Method
1. Make an observation of what u are testing 2. Form a question about ur observations. 3. Make a hypothesis 4. Conduct your experiment 5. Record information and results.
The first question depends what you will need to use first for the experiment.
a. iron ore - heterogeneous substance
(it contains a mixture of iron oxides)
b. quartz - homogeneous substance
(it is the crystalline silicon dioxide SiO₂, which is a very pure form of SiO₂)
c. granite - heterogeneous substance
(it as mixture of different oxides, mainly aluminium and silicon oxides)
d. energy drink - heterogeneous substance
(a mixture of water, sugar, carbon dioxide and different substances that may boost concentration, like caffeine)
e. oil-and-vinegar salad dressing - heterogeneous substance
(this salad dressing of oil and vinegar is composed of unsaturated triglycerides, acetic acid and water)
f. salt - homogeneous substance
(sodium chloride NaCl)
g. rainwater - homogeneous substance
(assuming the the atmosphere is clean, it is just pure water H₂O)
h. nitrogen - homogeneous substance
(it is the main component of air and it is a diatomic molecule N₂)
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An atom of Oxygen. Contains:
Protons = 8
Electrons = 8
Neutrons = Mass number - Number of protons = 18 - 8 = 10
Neutrons = 10.
The number of moles of moles of Magnesium,chlorine and oxygen atoms in 7.80 moles of Mg(ClO4)2 is calculated as below
find the total number of each atom in Mg(ClO4)2
that is mg = 1 atom
Cl = 1x2 = 2 atoms
O = 4 x2 = 8 atoms
then multiply 7.80 moles with total number of each atom , to get the number moles of each atom
that is
Mg = 7.80 x1= 7.80 moles
cl = 7.80 x2=15.6 moles
O = 7.80 x8= 62.4 moles
