Which of the following does nitrogen have an oxidation state of + 4?

What structural feature of a leaf enables it to obtain co2 from the air?

An aerosol spray can with a volume of 456mL contains 3.18g of propane gas as a propellant. If the can is at 23C, and 50atm, what volume would the propane occupy at STP?

Give the characteristics of a strong acid. a. ionizes completely in aqueous solutions b. has equilibrium far to the right c. has a polar bond d. has a weaker bond to hydrogen e. all of the above

17. What is the symbol for the element that forms a. protective oxide coating? (A) K (B) Ga (C) Al (D) Mg

The hydrated al3 ion, al (h2o) 63, is a weak acid in water. what are the products of its reaction with h2o

Why is an alkali metal like Sodium so reactive?

Hemoglobin, a protein in red blood cells, carries o2 from the lungs to the body's cells. iron (as ferrous ion, fe2+) makes up 0.33 mass % of hemoglobin. if the molar mass of hemoglobin is 6.8 Ã 104 g/mol, how many fe2 + ions are in one molecule?

Describe step by step how we can make a field of a variable quantity?

When NEM is added to a purified solution of creatine kinase, Cys 278 is alkylated, but no other Cys residues in the protein are modified. What can you infer about the Cys 278 residue based on this observation

When a theory is disaproved by further evidence, which of the following occurs?