What's is element classification why K2O Is an ionic component

How to calculate the number of atoms/molecules from a set number of moles.

Calculate the frequency (in Hertz) of light with a wavelength of 420 nm. What color is the light?

Silicon (atomic number 14) has three isotopes: 28Si, 29Si, and 30Si. What is the number of protons in an atom of silicon with the highest mass number? 14 16 29 30

Telescopes are examples of concave mirrors. true or false?

Which substance is an electrolyte 1) CCl4 2) SiO2 3) C6H12O6 4) H2SO4

How many mono-; di -; and trichloro derivatives are possible for cyclopentane?

A gas occupies 3.60 L when the temperature is 45.0oC and at 1.02 atm of pressure. What temperature change (in K) will be needed to change the volume to 6.25 L at constant pressure?

When did Pangaea begin to break apart? a. 20 million years ago c. 250 million years ago b. 100 million years ago d. 2 billion years ago.

When an object is thrown, the thrower pushes the object. This causes the object to move in a motion.

Distinguish between accuracy and precision in measurements