Which molecule is amphoteric?

A) NH4+

B) H2O

C) H2CO3-

D) H2SO4

If 1. oo mol CS2 reacts with 1.00 mol O2, identify the limiting reactant

Fred has a large piece of sugar that is not dissolving in his drink. How could he get the sugar chunk to dissolve faster?

How are the lungs kept free of germs and dirt from the air?

Which of the following reproduces asexually? A. flowers B. bacteria C. cats D. birds

Why do two oxygen atoms form a double covalent bond?

Renewable resources cannot be replaced in our lifetime

How do you make a guy who is extremely into you, even though he knows you aren't single, to bug off?

A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is

Which of these particles is the smallest? A. an atom B. a nucleus C. a proton D. an electron

In a five-fold serial dilution of a 20 pg/ml solution, all tube dilutions are 1/5. What is the substance concentration in the third tube of this series?