Who brought fireworks to italy from the far east

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 7000 N.

An atom of silicon has a mass number of 28 and an atomic number of 14. How can you determine how many protons and how many neutrons are in this atom?

Trevor lifts a 10kg box to the top of a cliff which is 20m high, in half an hour, then drops the box over the cliff. How much power did he use to lift the box?

Which of the following is a pair of vector quantities? a. speed - distance b. velocity - distance c. velocity - displacement d. speed - displacement

What is a definition for reactivity with vinegar?

The chemical combination of two or more different atoms in fixed amounts is called a (n) element. compound. orbit. mixture.

Use each of the following terms in a separate sentence. 1. Thermal energy 2. First law of thermodynamics 3. Temperature 4. Specific heat

Describe how to prepare a 10.0% w/v solution of salt in water in a 100 mL volumetric flask

what is the mass of an object that is moving at an acceleration of 25 m/s squared with a force of 20 N

A janitor comes across a spilled substance on the floor of a highschool chemistry lab. he wants to make sure that the liquid is neutral before cleaning it up. what would be safest to add to the puddle? a. pour on a base b. pour on a buffer c.