Explain how there can be so many different kinds of suntances in the world

Which is a physical change? A) burning wood Eliminate B) rusting metal C) cooking an egg D) freezing water

Why to organisms need natural resources?

What is the formula for the aqueous salt produced when hydrofluoric acid is neutralized by sodium hydroxide?

What is the name of a fluid with no viscosity

A. explain what is meant by term 1. atomic numbers 2. periodic pattern b. 1. state one physical property and one chemical property shared by helium, argon, and neon 2. what is name given to this group of elements?

Select the correct answer. In the graph, what effect would adding a catalyst have on D? A. It would decrease. B. It would increase. C. It would stay the same. D. You cannot tell from this graph.

Estimate the heat of neutralization of H3PO4 in kJ/mol given these dаta: Heat transferred = 2.5 x 102 J Moles of H3PO4 = 1.4 x 10-3 mol Moles of NaOH = 5.0 x 10-3 mol

Consider the elemts Ca, Ba, As, and Bi. Which has the ... largest radius? highest electronegativtity? Highest Ionization Energy?

How do guys Make sperm?

Maya's playroom is 12 m2. The length of the room is 3 m. What is the width? 4 m 8 m 15 m 36 m