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

Explain the relationship between gravity and pressure in a nebula

Why can't you stand with your heels and back to a wall and then bend over to touch your toes and return to your stand-up position?

Earth's temperature remains fairly steady, which means that Earth must return nearly the same amount of energy to space that it receives from the Sun. In what form (s) does Earth return most of this energy to space?

The pitch of a note corresponds to which property of sound waves

Why must the height of the meniscus in the graduated cylinder match the height of the water in the tub when measuring volume?

A possible means of space flight is to place a perfectly reflectingaluminized sheet into orbit around the Earth and then use the lightfrom the Sun to push this "solar sail." Suppose a sail of area5.

An electric circuit consists of a variable resistor connected to a source of constant potential difference. If the resistance of the resistor is doubled, then

What would happen if an electron was added to an atom

Is a stick living, non living or Dead?

A ball player catches a ball 3.24 s after throwing it vertically upward. With what speed did he throw it?