The combining of hydrogen and oxygen gas into liquid water is an example of what kind of change?

phase

chemical

physical

What does a molecule look like

1. Which best explains why ionization energy tends to decrease from the top to the bottom of a group? A. The number of orbitals decreases. B. The number of neutrons decreases. C. Electrons get closer to the nucleus. D.

When the skateboarder reaches the top of the half-pipe, what type of energy is at it's maximum?

Which component is required for the activation of some enzymes? a) Presence of a co-factor b) Basic pH levels in the substrate c) Higher enzyme concentration d) Lower temperature in the substrate

How many moles of nitrate ions are present in exactly 275 ml of a 1.25 m copper (ii) nitrate solution, cu (no3) 2 (aq) ?

A compound with molecular formula C6H15N exhibits a singlet at d 0.9 (1H), a triplet at d 1.10 (3H), a singlet at d1.15 (9H), and a quartet at d 2.6 (2H) in its 1HNMR spectrum. Its IR spectrum shows one medium absorption band near 3400 cm-1.

A system that transmits genetic information from one generation to the next

Consider the following four solutions: a. NaCl in water b. Acetic acid in water c. Acetic acid in benzene d. Naphthalene in benzene Which of these solutions has the strongest solute-solvent interactions and the interaction is of which type?1.

Formula for sulfur tetrafluoride

Geologists think that parts of the Appalachian Mountains formed originally from sediments accumulating in shallow swamps. The weight of the sediments caused the area beneath them to sink, allowing more sediments to accumulate.