Q: Q: Changing levels of what substances partly explain emotional ups and downs in teens? Choices: - nutrients - acids - enzymes - hormones A:
A: hormones

Q: Q: What do you call a condensation reaction in which an ester is formed from an alcohol and a carboxylic acid? Choices: - transesterification - esterisation - decarboxylation - esterification A:
A: esterification

Q: Q: What is the name for a matter that has a fixed volume and a fixed shape? Choices: - gas - stable - liquid - solid A:
A: solid

Q: Q: When we move down a group of elements on the periodic table, what happens to their electronegativity? Choices: - it increases - it stays the same - it doubles - it decreases A:
A: it decreases