Zinc is added to a breaker containing hydrochloric acid and the beaker gets warm what type os reaction is this

He is the chemical symbol for which element? Select one: a. hydrogen b. hassium c. helium d. hafnium

On April 15, 1912, the luxury cruise liner Titanic sank after running into an iceberg. What was the cruise liner's speed when it collided with the iceberg if it had a mass of 4.23 x 108 kg ship and a momentum of 4.9 x 109 kg·m/s?

What explanation does general relativity provide for gravity?

When a sealed thermos bottle full of hot coffee is shaken what are the changes in the temperature of the coffee and the internal energy of the coffee?

Explain why ionic compounds are neutral even though they are made up of charged particles

A stretched spring has 5184 J of elastic potential energy and a spring constant of 16,200 N/m. What is the displacement of the spring?

A block of mass 1.3 kg is resting at the base of a frictionless ramp. A bullet of mass 50 g is traveling parallel to the ramp surface at 250 m/s. It collides with the block, enters it, and exits the other side at 100 m/s.

Metals are good thermal conductors - that is, when there is a temperature difference across their ends, they transfer energy very efficiently from the higher temperature end to the lower temperature end.

Some stars are so far away that their light hasn't reached Earth yet. A million years in the future, will the sources of light we see when we look up at night be the same? Why or Why not?

A sound wave travels through water. What best describes the direction of the water particles?