What types of elements usually form covalent bonds?

Why are allergic reactions often referred to as inappropriate responses of the immune system?

Woodpeckers find insects to eat by pecking holes in trees with their beaks. One day, a woodpecker finds a particular tree that offers an abundant supply of the bird's favorite bugs. The woodpecker is likely to return to that tree again and again.

What would be the result of changing the number of each subatomic component on an atom?

Compare and contrast the movement of water molecules when water is in a solid liquid or gaseous state. How is the movement of water dependent upon tempature

Which atom has the largest number of neutrons? phosphorus-30 chlorine-37 potassium-39 argon-40 calcium-40?

If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ∘C∘C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/molkJ/mol.)

Which of the following is not a disaccharide? A) sucrose B) maltose C) lactose D) amylose E) all of the above are disaccarides

The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles

Ice melting, water boiling, lighting a match, grape juice freezing. Which statement describes evidence of a chemical reaction

An ion from a given element has 22 protons and 18 electrons. what is the charge on the ion?