What is the meaning of 1s2 electron configuration (tell what 1 means, the s means and the superscript of 2 means) ?

What is the mole fraction of solute in a 3.84 m aqueous solution?

Is boiling water exothermic or endothermic? What about condensing?

Which step of the scientific method involves obtaining resources for your question? ask a question construct a hypothesis background research test with experiment

How does an insect species become resistant to an insecticide? The more exposure an insect has to the insecticide the weaker the effects of it are. After an exposure if the insect survives, it mutates to become resistant if it encounters it again.

Which anion would bond with K + in a 1:1 ratio to form a neutral ionic compound? Select the correct answer below: A. O2- B. F- C. N3- D. S2-

If a solution A has twice as much solute as solution B. Is it possible for the solutions to have the same concentration?

Chris is studying oxidation and reduction reactions. Which of the following could she use as an example of an oxidation reaction?

In a short circuit as the resistance decreases what happens to the current?

Describe the characteristic of chemical structure found at the core of each steroid hormone

A molecule has one carbon-carbon double bond and four monovalent atoms or groups. how many different geometric isomers exist for this molecule?