All substances are composed of which type of matter
2 answers:
Answer: All substances are composed of elements.
Explanation: Matter is anything which has mass and occupies space.
The substances can be made up element alone like Helium (He).
They can be made up of molecules of elements also like hydrogen
They can also be made up of molecules of compounds like carbon dioxide
They can be made up of mixtures like salt solution in water.
Since all the mixtures, compounds and molecules consists of elements. Therefore, all the substances are composed of elements.
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Answer:
Equation 2, because K being more reactive, exchanges position with Pb in PbNO3.
Explanation:
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In this case, according to the given reactions, it is possible to realize that according to the reactivity series, since K is is group 1A of alkali metals, we infer it is by far more reactive than magnesium, for that reason last two choices can be easily discarded. Now, considering equation 2, it would be necessary to complete it to figure out the correct option:
Whereas it can be seen that potassium exchanges position with Pb according to the double displacement reaction; therefore, the correct answer is "Equation 2, because K being more reactive, exchanges position with Pb in PbNO3".
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