The most active of all the chemical elements is a halogen known as

A. astatine.

B. bromine.

C. fluorine.

D. iodine

If a farmer wants to increase the health of his crops, he could apply a nitrogen-based fertilizer. why is nitrogen important to plants?

In the vertical columns of the periodic table, as the atomic numbers increase: The numbers of electrons in the valence shell increase. The tendency to lose electrons decreases.

Jane often make inferences what is an example of an inference she made about the chimpanzee

Read the excerpt from a science text. In our experiment, we filled two identical glasses with water. To one glass, we added two tablespoons of salt and stirred. To the other glass, we added four drops of food coloring and stirred.

Why are benzene rings more stable than alkenes?

Under what condition is decompostion the fastest? Under what condition is it the slowest?

Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI

Arrange the following bonds in order of increasing polarity: O-H, C-H, F-H, H-H A) O-H B) C-H<0-H C) H-H D) C-H E) HH

How fast do p waves travel?

Calcule o calor especifico do estanho sabendo que foram necessarias 100 cal para elevar em 20ºC a temperatura de 100 g de estanho