The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence, predict the for
mulas for the following.
nitrate NO3 - phosphate PO4³-
sulfate SO4²- acetate C2H3O2 -
ammonium NH4 4 chromate CrO4²-
carbonate CO3²- dichromate Cr2O7²-
permanganate MnO4 - sulfide S²-
sodium carbonate
potassium permanganate
nitrate NO3 - phosphate PO4³-
sulfate SO4²- acetate C2H3O2 -
ammonium NH4 4 chromate CrO4²-
carbonate CO3²- dichromate Cr2O7²-
permanganate MnO4 - sulfide S²-
sodium carbonate
potassium permanganate
2 answers:
Answer: or Sodium carbonate.
or Potassium permanganate
Sodium ion carries 1 + charge whereas carbonate ion carries overall charge of -2. So for every carbonate ion, two sodium ions combine to balance the charges and thus form a stable compound,
Potassium ion carries 1 + charge where as permanganate ion carries overall charge of -1. So for every permanganate ion, one potassium ion combines to balance the charges and thus form a stable compound,
The predicted formulas are shown in the attached image.
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Answer:
6. 7870 kg/m³ (3 s.f.)
7. 33.4 g (3 s.f.)
8. 12600 kg/m³ (3 s.f.)
Explanation:
6. The SI unit for density is kg/m³. Thus convert the mass to Kg and volume to m³ first.
1 kg= 1000g
1m³= 1 ×10⁶ cm³
Mass of iron bar
= 64.2g
= 64.2 ÷1000 kg
= 0.0642 kg
Volume of iron bar
= 8.16 cm³
= 8.16 ÷ 10⁶
Density of iron bar
= 7870 kg/m³ (3 s.f.)
7.
Mass
= 1.16 ×28.8
= 33.408 g
= 33.4 g (3 s.f.)
8. Volume of brick
= 12 cm³
Mass of brick
= 151 g
= 151 ÷ 1000 kg
= 0.151 kg
Density of brick
= mass ÷ volume
(3 s.f.)