Answer:
B. Prepare solutions of different acid concentrations, measure 50 milliliters of each into different beakers, and place metal samples of different types but of the same mass into the beakers.
Explanation:
Since Michael is studying the factors that affect corrosion of metals, and wants to test the effect that different concentrations of an acid will have on the corrosion of a metal, using different acid concentrations of the same volume on different metal samples of the same size would give a much better than all the other options because, a standard volume of acid is used and also a standard mass of metal is used. So, the effect can be measured quantitatively since we have the same quantity of sample.
So, option B is the answer
Condensation goes with A.
Evaporation goes with C.
Sublimation goes with B.
Freezing goes with D.
Answer:Specific gravity, also called relative density, is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.
Explanation:
Answer:
There are 0.1387 moles of oxygen atoms.
Explanation:
First we <u>calculate how many moles of ammonium phosphate there are</u>:
- There are 3 nitrogen moles per (NH₄)₃PO₄ mole.
- There are 0.104 nitrogen moles
- Thus there are (0.104 mol N *
) 0.0347 moles of (NH₄)₃PO₄.
Finally we calculate<u> how many moles of oxygen atoms are there in 0.312 moles of (NH₄)₃PO₄</u>:
- There are 4 oxygen moles per (NH₄)₃PO₄ mole.
- There are 0.0347 moles of (NH₄)₃PO₄.
Thus there are (0.0347 mol (NH₄)₃PO₄ *
) 0.1387 moles of O.