Which is a characteristic of colloids? a. are homogeneous mixtures
b. have large dispersed particles
c. will settle out over time
d. are made up of at least two substances

D.are made up of at least two substances

Explanation:

B, have large dispersed particles

Explanation:

I almost thought it was d, but the text clearly reads "Colloids are mixtures in which one or more substances." Making the answer B, "relatively large solid particles"

Colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid, liquid, or gaseous medium. The particles of a colloid remain dispersed and do not settle due to gravity, and they are often electrically charged.

confused

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nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.