Select the correct answer.
The chemical composition of most stars usually has which element in the highest concentration?
A. oxygen
B. hydrogen
OC. chromium
OD. lead

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

Check the correct box to describe the periodic trends in electronegativity. electronegativity across a period: decreases. increases. electronegativity down a group: decreases. increases.