According to The Evolution of Useful Things, what caused the popularity of Post-it notes? a prior need for them their varied styles widespread availability their varied uses

Name two elements that have properties similar to copper

A student performs an experiment to see how catalysts affect the rate of a reaction. He notices that when the reaction is nearly finished, it stops bubbling. He wants to know how much faster the reaction occurs when a catalyst is used.

Explain how cobalt-60 and cobalt - 59 can be the same element but have different mass numbers

When scientists conduct scientific investigations do they use the scientific inquiry or theory

How are the relative gas volumes collected in the two tubes related to the relative number of gas molecules in the tubes?

What do igneous rocks form from? (20pts!)

A gas at STP has a volume of 1.0 liter. If the pressure is doubled and the temperature remains constant, the new volume of the gas will be ... ?

Combustion analysis of toluene, a common organic solvent, gives 8.20 mg of co2 and 1.92 mg of h2o. if the compound contains only carbon and hydrogen, what is its empirical formula?

Why does the moon have phases? What are the four main phases of the moon? How long does it take to change from one to another?

How many atoms are in 1/2 mole of calcium