Compare and contrast a pure substance with a mixture and give an example.

A student listed three ways to predict if a bond is ionic. 1. A metal is bonded to a non-metal. 2. The electronegativity difference between the atoms is large. 3. Light elements form ionic compounds when bonded to heavy elements.

Given that oxygen see saying and I was just going to 18 both have an atomic number of 8 how many electrons protons and neutrons does these oxygen atoms contain

Planck's equation E = h x v is used to determine which of the following?

A typical phase change diagram is shown below. Which of the numbered arrows represent changes where the kinetic energy of the particles increases

What has alternating electronic and magnetic fields that travel in the form of a wave

If a normal force of 500 N is acting on two surfaces in contact with a coefficient of friction equal to 0.50, what would be the maximum force of static friction?

Elements with the same number of shells are called? All the element that have the same number of valence electrons and have similar physical and che. ical properties are called?

How many moles are in 23.4 g

A chemist prepares hydrogen fluoride by means of the following reaction: CaF2 + H2SO4 - -> CaSO4 + 2HF The chemist uses 11 g of CaF2 and an excess of H2SO4, and the reaction produces 2.2 g of HF. (a) Calculate the theoretical yield of HF.

Gaps in rock layers that develop when agents of erosion remove existing rock layers