Explain what happens to the particles in a substance during a physical change.

What is the ph of a 7.5*10-3m oh - solution? ph=?

Which part of a phospholipid molecule is found in the middle of a lipid bilayer? hydrophilic head hydrophobic tails glycerol backbone carboxylate groups Description

Which of the following could happen when infrared radiation is absorbed by a molecule? A) molecules begins to rotate more rapidly B) molecule may glow in the dark C) Electrons are promoted from filled to empty molecular orbitals D) The orientation

What part of the ear is damaged most easily by continued exposure to loud noise?

Which statement best describes the properties of metals? A. They are shiny and bend without breaking. B. They are dull and are good electrical insulators. C. They conduct electricity well and are brittle. D.

Which statement best explains the plateau seen in the cooling curve of naphthalene? A) The energy of the system decreases B) The temperature of the system increases C) the temperature of the system decreases D) The energy of the system remains

A group of organisms that breed and produce offspring that can breed. A. Species B. ecosystem C. Biodiversity

The surface of the earth is divided into more than 50 large plates

What is the net ionic equation for AgNO3 (aq) + K2SO3 (aq) ?

Oil and water a combined to make salad dressing. Physical Change? Chemical Change? Both?