A commonly used abrasive that is NOT used in toothpaste is A) ...

[tth]

A commonly used abrasive that is NOT used in toothpaste is
 
  A) sugar.
  B) calcium carbonate.
  C) calcium hydrogen phosphate.
  D) calcium pyrophosphate.

Question 2

A gasoline with an octane rating of 90 would give the same performance in a standard test engine as a mixture of
 
  A) 90 isooctane and 10 heptane.
  B) 90 heptane and 10 isooctane.
  C) 90 parts isooctane and 90 parts heptane.
  D) 90 parts isooctane and 90 parts water.

[deja]

Answer to Question 1

A

Answer to Question 2

A