Which of the following is not an indication of a chemical change? A. fracture formation. B. energy transfer. C. precipitate formation. D. gas production

Shawn conducted an experiment and did not get the results he was expecting. What should he do first? A) Shawn should write conclusions. B) Shawn should share his results. C) Shawn should explain what he thought should have happened.

Determine the ph of a 0.227 m c5h5n solution at 25°c. the kb of c5h5n is 1.7 * 10-9.

Divergent plate boundary is when two plates come together True or false

An angle of 200° is a/an angle.

True or false forces on earth are different from those elsewhere in the universe

Altering the pressure of a system can affect the rate of a chemical reaction. true false

What does ice cream melt on a hot day which type of thermal energy transfer does this melting represents

For which purpose do biochemists insert human genes into bacteria? to find a cure for the common cold to produce insulin for diabetics to kill resistant strains of bacteria to evolve certain species of bacteria

Cracks in rocks chemical or mechanical

A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins. A) 0.5 sec B) 0.3 sec C) 2.3 sec D) 1.9 sec