Why is an element considered a pure substance?

An anaerobic reaction takes place only when there is plenty of oxygen only in the presence of nitrogen in water in little or no oxygen

Opening a can of paint requires a screwdriver or other machine to pry open the lid. how does a screwdriver affect the force applied to opening the lid A. it increases the applied force and reduces its distance B.

Cassie's older sister is really good at gymnastics, so Cassie knows she will never be as good. Whenever she goes to gymnastics practice, Cassie tries to hide in the back.

What is the state of matter as thermal energy is added to ice?

Calculate the total volume of gas (at 119? c and 731 mmhg produced by the complete decomposition of 1.71 kg of ammonium nitrate.

What does the dashes line represent? A. Medium B. Boundary C. Normal D. Incident Ray

Only a small amount of cerium oxide nanoparticles is needed because the nanoparticles ... 1) are elements 2) are very reactive 3) have a high surface area to volume ration

Describe the solubility of water compared to ethanol?

When the free-energy change (AG) of a reaction is negative, the reaction is said to be: Endergonic Non spontaneous Spontaneous Endothermic

The solubility of carbon dioxide gas in water can be increased by