Name 2 parts of a microscope

Water can be formed in the following reaction: 2H2 + O2 - > 2H2O. If you have 12 moles of Hydrogen gas (H2), how many moles of Oxygen gas (O2) will you need to make as much water as possible? (Enter just the number; not the number and units)

Who established using atomic numbers as the basis for organizing the periodic table?

In a calorimeter 3.34 kj of heat was absorbed when 10g of ice melted. What is the enthalpy of the fusion of the ice? I know the answer is 334J/g but I don't know how?

It requires1200 kg of coal to produce the energy needed to make 1.0 kg of aluminum metal. If a single soda can requires approximately 15 g of Al, what mass of coal would be needed to produce a 6-pack of cans?

How to indicate how many atoms are in each molecule

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?

Two identical atoms from Area B bond together. What type of bond will they most likely form A. Electrostatic B. Metallic C. Ionic D. Covalent

Which would be the best way to represent the concentration of a 1.75 M K2CrO4 solution? 1.75% K2CrO4 [K2CrO4] (K2CrO4) K2CrO4, [M] = 1.75