Cuando se quema fosforos es cambio quimico ofisico

What are the three major fossil fuels?

Which of the following provides support and protection for many insects a) muscle b) skeleton c) spinal cord d) exoskeleton

Which particles that make up an atom are involved in nuclear reactions? A. protons only B. protons and neutrons C. electrons only D. electrons and neutrons

Mass is a property of matter true or false

What name do we give to the family that combines liquid and gas

5.2*10^26 molecules of ch4 in volume

Which of the following statements about igneous rocks is correct A. intrusive igneous rocks are formed when magma is called above the ground. B. Extrusive igneous rocks are formed when magma is cooled above the ground C.

The compound KOH is called

A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm?

If 100 mL of a gas were enclosed in a buret at 500 mm Hg, what volume would the gas occupy at 1000 mm Hg at the same temperature? P1V1=P2V2