A few days ago
Which of the following is a mixture?
carbon dioxide
silicon
silicon dioxide
sand
Top 4 Answers
A few days ago
Favorite Answer
The question is really, which of these items is an element in the table of elements?
Think about it.
Carbon di-oxide: What you are saying is, carbon atoms and oxygen atoms, mixed up in a “MIXTURE!”
Silicon Di-Oxide: Same idea. Silicon atoms and two (di) oxygen atoms per molecule to make a “MIXTURE!”
Sand: Okay, what is in sand? It could be silicon, iron, lead, calcium carbonate or salts from sea. Lots of stuff, right? A “MIXTURE!”
The only one left is good old SI, silicon. The atom. The element. NOT a MIXTURE of anything, just atoms making up the element Silicon.
Understand now? Good.
1
A few days ago
Think. Remember that a mixture is not chemically combined but physically combined. Sand is definitely a mixture composed of minerals and dusts.
0
A few days ago
sand is a mixture, the rest are pure substances
1
A few days ago
sand. a ad c are compounds and b is an element.
1
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