Descibe enthalpy change in term of exothermic and endothermic

Is the element OH really an element?

1. Which type of metal did Rutherford shoot alpha particles into? A) Copper B) Zinc C) Gold D) Platinum 2. When Thomson held a positively charged plate near the cathode ray, the beam bent toward the plate.

In naming the compound pcl5 the prefix used with the second element is

What is an electron and proton?

Balance the equation for the reaction given below: CuCl2 + NaNO3  Cu (NO3) 2 + NaCl

Which best describes the transition from gas to liquid? Energy must be removed because particles in liquid move more slowly. Energy must be added because particles in liquid move more quickly.

Calculate the mass of a 0.255-ml sample of a liquid with density 0.660 g/ml.

Which statement correctly describes the interaction between magnetic poles? North and south poles attract each other. North and south poles repel each other. Two north poles will attract each other. Two south poles will attract each other.

You are measuring the mass of various shapes objecys and identifying their shaped ypu then record the qualitative and quanatitave data in a table is qualitataive wnd which is quatitaive

A positively charged wire is attracted to a negatively charged piece of metal. What force causes this?