Will give brainliest!

What percentage of a substance remains after 7 half-lives have passed?

2.5

1.25

0.78

0.39

Huge craters formed when ... ?

Which of these terms best describes the following statement? "A solution of the unknown compound turned litmus paper blue" A. Hypothesis B. Model C. Quantitative observations D. Qualitative observation

What did Mendel produce when he cross-bred different true-breeding plants

Compare and contrast the rod cells and the cone cells in the retina of the human eye.

If the reaction to form water were written h2 (g) + 12o2 (g) →h2o (g), would you expect the same value of δh as in equation 2h2 (g) + o2 (g) ⟶2h2o (g) δh=-483.6kj?

Tina has a sample of gaseous water at a temperature of 400 C and a pressure of 4 atm. If Tina increases the pressure to 200 atm, will the gaseous water liquefy? Why or why not?

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum

At 100 degrees c, water reacts with acetic anhydride to make acetic acid. also, at 100 degrees c, water reacts with acetylsalicylic acid and reverts it to salicylic acid and acetic acid.

What is the valence electron configuration of the group 2a elements?