Question

what is a pure substance that contains atoms of more than one element called?
a precipitate
a solution
a mixture
a compound
question 5
which item is a pure substance?
ocean water
cake mix
10 carat gold
solid gold
question 6
what is true of a saturated solution?
no more solution can be made.
no more solvent can be dissolved.
no more solute can be dissolved.
the concentration cannot be decreased.

Explanation:

• First question: A compound is a pure substance composed of atoms of more than one element. A precipitate is a solid formed in a chemical reaction. A solution is a homogeneous mixture. A mixture is composed of two or more substances.
• Second question: A pure substance has a definite composition. Ocean water has salt and water (a mixture). Cake mix has multiple ingredients (a mixture). 10 - carat gold has other metals mixed with gold. Solid gold (assuming it is pure gold, like 24 - carat) is a pure substance (an element, which is a type of pure substance).
• Third question: A saturated solution is one where no more solute can be dissolved at a given temperature and pressure. Solvent is the dissolving medium (more solvent can be added in most cases). The concentration can be decreased (e.g., by adding more solvent). And solutions can still be made (by changing temperature etc. in some cases, but the key is about solute dissolution in the context of saturation).

Answer:

• First question: a compound
• Second question: solid gold
• Third question: No more solute can be dissolved.