Phenolphthalein is an acid base indicator. what color does it possess in the presence of excess hydrogen (i. e., hydronium) ions?

Is this organism affecting the lives of humans? If so, how?

As the dry bulb temperature increases, and assuming a constant wet-bulb depression, what do you think the relative humidity will do?

Define ionic bond, covalent bond, hydrogen bond, molecular weight, and mole

rinking water suggest an upper limit of 250 mg/L for chloride ion. If 1.03*104 liters of water in a storage tank contains 1.40 grams of Cl-, what is the contaminant level in ppm? in ppb? Is this level acceptable based on EPA guidelines?

How many single covalent bonds must a phosphorus atom form to have a complete octet in its valence shell? how many single covalent bonds must a phosphorus atom form to have a complete octet in its valence shell? 3 1 4 0 2?

When does raising the temperature of a gas increase its pressure? A. temperature B. volume C. number of particles D. pressure

Hexyne. What does the name of this hydrocarbon tell you about its molecular structure?

Which of the following processes includes all of the others? Group of answer choices transport of an ion down its electrochemical gradient osmosis passive transport facilitated diffusion

How is the Bohr atomic model different from the plum-pudding model? A. In Bohr's model, the atom's mass is found at its center instead of distributed throughout. B. In Bohr's model, the atom's mass is mostly made up of electrons instead of protons.

What does the cell theory state? A. that cells come from other cells B. that cells come only from animals C. that cells cannot be created or destroyed