Which is an example of an element?

a. salt (nacl)

b. water (h20)

c. silver (ag)

d. electron (e-) hint?

Use VSEPR theory to decide which one of the following molecules and ions will definitely have at least one 90° bond angle in it. (In each case except water, the central atom is the first one in the formula.

Which cell structures function like power plants for plant or animal cells? A. nuclei B. vacuoles C. ribosomes D. mitochondria

Antacid tablets commonly contain calcium carbonate and/or magnesium hydroxide. draw the lewis structure for calcium carbonate and magnesium hydroxide.

A pet owner dropped some new fish into a pond. Several species of fish lived in the pond, but within a few months, only members of the new species survived. What best explains why this happened?

Explain how the number of chromosomes per cell is cut in half during meiosis in which the diploid parent cell produces haploid daughter cells.

In what layer of the skin is melanin found? What does melanin do for skin cells?

An exothermic reaction?

How many atoms of Fluorine are in 595.85g of SeO2F2? A: 6.02 x 10^23 B: 1.204 x 10^24 C: 2.408 x 10^24 D: 4.816 x 10^24

Describe how NH3 and CF4 satisfies the octet for all atoms.

What two items must be equal for a nuclear equation to be balanced?