Answer:
physical
Explanation:
The zinc (which was already silver) coated the penny. The NaOH dissolved the zinc. (that was what made the water murky) And small pieces of zinc adhered to the penny (coated) It was a physical change because no NEW color was created.
Answer:
The more polar the molecules, the stronger the force. The more hydrogen in the molecule, the stronger the force.
Explanation:
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Answer:
1.diamond, graphite, and fullerenes.
2.a material produced by the incomplete combustion of heavy petroleum/ink for printing newspapers, as ink-jet toner, and coloring leather in shoes
3.Diamond is extremely hard while graphite is pretty soft, diamond has a greater density than graphite, and diamond is semi transparent while graphite is dark and foggy
4.Graphite can conduct electricity because of the free electrons in its structure. However, in diamond, all 4 outer electrons on each carbon atom are used in covalent bonding, so there are no delocalised(free) electrons.
Explanation:
702 mL of 0.235 M H₂SO₄ solution are needed to neutralize the NaOH
Explanation:
When sodium hydroxide (NaOH) is neutralized by the sulphuric acid (H₂SO₄) the following chemical reaction occur:
2 NaOH + H₂SO₄ → Na₂SO₄ + 2 H₂O
number of moles = mass / molecular weight
number of moles of NaOH = 13.20 / 40 = 0.33 moles
Taking in account the chemical reaction, we devise the following reasoning:
if 2 moles of NaOH are reacting with 1 mole of H₂SO₄
then 0.33 moles of NaOH are reacting with X moles of H₂SO₄
X = (0.33 × 1) / 2 = 0.165 moles of H₂SO₄
molar concentration = number of moles / volume (L)
volume = number of moles / molar concentration
volume of H₂SO₄ solution = 0.165 / 0.235 = 0.702 L = 702 mL
Learn more about:
molar concentration
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