Answer:
The element that is commonly used to reduce iron oxide would be <u>carbon.</u>
Explanation:
:)
Answer: Sodium
Explanation: The sodium has only one electron at the outer layer.
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Explanation:
option A skeleton system is correct option
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A. all magnets have two poles
Explanation:
A change that does not cause any change in chemical composition of a substance is known as a physical change.
For example, mass, density, volume etc are all physical changes.
On the other hand, a change that brings change in chemical composition of a substance is known as chemical change.
For example, combustion, toxicity, reactivity etc are all chemical changes.
Hence, following statements are identified as chemical or physical changes as follows.
(a) Oxygen gas supports combustion : Chemical change
(b) Fertilizers help to increase agricultural production : Chemical change
(c) Water boils below
on top of a mountain : Physical change
(d) Lead is denser than aluminum : Physical change
(e) Uranium is a radioactive element : Chemical change