Answer:
atoms have no overall charge. this is because they contain equal numbers of positive protons and negative electrons
The number of moles of H atoms in 15.2 grams of pure ice is 0.850 moles
The number of moles of O atoms in 15.2 grams of pure ice is 13.50 moles
<h3>What is an atom?</h3>
An atom is a smallest indivisible particle of a chemical element that is capable of independent existence.
- Pure ice contains the H2O molecules and the molar mass of H2O is 18.02 g/mol
Using the relation:
- number of moles = mass/molar mass
The number of moles of H2O = 15.2 grams/18.02 g/mol
number of moles of H2O = 0.8435 moles
If the atomic mass of H and O are as follow:
- the atomic mass of H atom is = 1.00784 g/mol
- the atomic mass of O atom is = 15.999 g/mol
Then:
the number of H atoms in 15.2 grams of pure ice = mass of H atom × molar mass of H2O.
the number of H atoms = 0.8435 mol × 1.00784 g/mol
the number of H atoms = 0.850 moles
the number of O atoms in 15.2 grams of pure ice = 0.8435 mol × 15.999 g/mol
the number of O atoms = 13.50 moles
Learn more about atoms here:
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The words that complete the blanks are hypothesis and experimentation.
<h3>What is scientific knowledge?</h3>
The process by which scientists obtain information and establish knowledge is;
Observation ---> hypothesis ------> experiments ------> Theory -------> Law.
Thus after the process of observation what we have is merely a scientific hypothesis that needs to pass through the process of rigorous experimentation before it is proven to be true.
Thus the words that complete the blanks are hypothesis and experimentation.
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The unbalanced Equation is
electricity
KI (aq) + H2O (l) -------------> H2 (g) + I2(g) + KOH(aq)
SCBA tanks use regular air, not pure oxygen. <span>Modern SCBA cylinders are carbon fiber wrapped aluminum. They do get hot under high temperature conditions. But, the most common ones today are tested to 6000 PSI, and filled to 4500. This gives them some buffer for increase in pressure due to heating. Furthermore, any increase in pressure from heat is usually offset by the rapid release of air as we breathe the tank down. Firefighting is heavy, hot, difficult work, and a tank of air usually lasts about 2/3 of what it states on the label.</span>
