In potassium sulfate (K₂SO₄):
1) potassium has oxidation number +1, because it is metal in first group of Periodic table of elements.
2) sulfur has oxidation number +6.
3) oxygen has oxidation number -2, because it gain electrons from potassium and sulfur.
Compound has neutral charge: +1· 2 + 6 + (-2) · 4 = 0.
Answer: More than 700 different types of igneous rocks are known. Sedimentary rocks form by the compaction and cementing together of sediments, broken pieces of rock-like gravel, sand, silt, or clay. ... Metamorphic rocks form when the minerals in an existing rock are changed by heat or pressure below the surface.
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Answer:
See explanation
Explanation:
Electron affinity is the energy released when an extra electron is added to a neutral gaseous atom. A negative value of electron affinity indicates that energy is given out and vice versa.
Metals have positive electron affinity since electrons rarely accept electrons, so;
Na(g)+ 1e^- → Na^-(g) positive
Mg(g)+1e^- → Mg^-(g) positive
For the last case; Br(g)+ 1e^- → Br^-(g), the electron affinity for the non-metals is negative. hence the answer
Answer:
wait did you tell up the answer?
Explanation:
Answer:
0.5m/s2
Explanation:
Data obtained from the question include:
u (initial velocity) = 0m/s
v (final velocity) = 30m/s
t (time) = 1min = 60secs
a (Acceleration) =?
a = v — u/t
a = 30—0 / 60
a = 30/60
a = 0.5m/s2
