Giovanni created this chart to study for an exam.

a 2-column table titled common ionic compounds. the first column labeled compound has entries sodium hydroxide (n a o h), iron oxide (f e o), calcium chloride (c a c l subscript 2), calcium carbonate (c a c o subscript 3). the second column has entries plastics, soap, and paper production; toothpastes and antacids snow removal; dark pigments in makeup.
which best describes how to correct the error in the chart?

remove “plastics” from the uses for sodium hydroxide.
swap the uses for iron oxide and calcium carbonate.
change the use for calcium chloride to “used in preservatives.”
add “de-ice roads” to uses for calcium carbonate.

b- swap the uses for iron oxide and calcium carbonate.

Explanation:

just took the test. good luck!

The correct answer is "Swap the uses for iron oxide and calcium carbonate".

Explanation:

Giovanni's chart can be summarized as follows:

- Sodium Hydroxide (NaOH): Plastic, soap, and paper production

- Iron oxide (FeO): Toothpastes and antacids

- Calcium chloride (caCl2): Snow removal

- Calcium carbonate (CaCO3): Dark pigment in makeup

It is false to affirm that Iron oxide is used to produce toothpastes and antacids, and that calcium carbonate is used to produce dark pigment in makeup. This chart can be corrected by swapping the uses for iron oxide and calcium carbonate. For its black color, iron oxide is often used to produce dark pigments, while calcium carbonate is used in antacids and its abrasive properties are used in toothpastes.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

tracks, burrows, eggshells, nests, tooth marks, or gastroliths