12. Which element is used in bright, flashing advertising signs?

A year has 365 days, and a day has 24 hours. if an hour has 60 minutes and a minute has 60 seconds, how many scleconds are there in one year?

How do positive and negative ions for?

What is the molecular basis for the observation that the overall charge on a protein becomes increasingly positive as pH drops and more negative as pH increases?

List two things (number them 1 and 2) that are special about hydrogen allowing it to form hydrogen bonds when bound to oxygen: 1 ... 2 ...

If atoms of a halogen nonmetal gain one electron the atoms then have

What's a certain indicator that a molecule is polar? the molecule has a nonpolar covalent bond and the dipole is cancelled due to symmetrical arrangement of atoms the molecule has a polar covalent bond and the dipole is cancelled due to symmetrical

In the synthesis of barium carbonate from an alkali metal carbonate (M2CO3 where M is one of the alkali metals) a student generated 3.7 g of barium carbonate from 2.0 g of their alkali metal carbonate.

Give the state of matter that water is in as it moves through earths system

What happens to the volume of a substance as temperatures rises?

Find the total number of atoms in a sample of cocaine hydrochloride, c17h22clno4, of mass 22.5 mg.