He realized that the physical and chemical properties of elements<span> were related to their atomic mass in a '</span>periodic<span>' way, and </span>arranged<span> them so that groups of </span>elements<span> with similar properties fell into vertical columns in </span>his table<span>.
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Answer:
C
Explanation:
4(Al)+3(O2)==2(Al2O3)
Also, i'm in sixth grade just took a leson on a text book so may be wrong but i'm prety sure it's the correct nswer because x(Al)+y(O2) can not make hydregen for the h2o and for b, al+so2 = al2O3 makes sense but where did the sulfer go?
Answer:
The oxidation state of sulfur, S, is +6, and the oxidation state of oxygen, O, is - 2:
Explanation:
Application of rules
1. <u>Ion SO₄²⁻</u>
In a neutral compound, the sum of the oxidation states of all the atoms that constitute the compound is equal to zero. In ions the sum of the oxidation states of the atoms is equal to the charge of the ion.
- In this case, the ion SO₄²⁻ has charge negative 2: - 2
<u>2. Oxygen</u>
With the exception of the peroxides, when oxygen is combined with other elements, it always has oxidation state - 2.
Hence, the total charge of the four atoms of oxygen in SO₄²⁻ is 4×(-2) = - 8.
<u>3. Sulfur</u>
Therefore, naming x the unknown oxidation state of S, you can set this equation:
- x + ( - 8) = - 2
- ⇒ x = - 2- ( - 8) = - 2 + 8 = + 6
Conclusion
- In SO₄²⁻, the oxidation state of sulfur, S, is +6, and the oxidation state of oxygen, O, is - 2.
Animal cells do not have a cell wall or chloroplasts but plant cells do. Animal cells are mostly round and irregular in shape while plant cells have fixed, rectangular shapes.
