When an atom's electron is in an orbital higher than the ground state, the atom is in a (n)

ionized state.

ground state.

neutral state.

excited state.

A balloon filled with helium gas at 1.00 atm occupies 12.9 L. What volume would the balloon occupy in the upper atmosphere, at a pressure of 0.19 atm and a constant temperature? Enter your answer in the box provided.

If a current-carrying wire is in a magnetic field, in what direction will a force be exerted on the wire? A. Perpendicular to the magnetic field and parallel to the current direction B. Parallel to both the current direction and the magnetic field C.

How many grams of hydrogen peroxide (H2O2) must be added to 1,500 mL of water to produce a concentration of 1.33 m (molal solution) ? (Recall that the density of water is 1.0 gram/mL.)

An iconic bond occurs between what particles? A. a positive and negative ion B. two positive ions C. two negative ions D. two neutral atoms

If the net force on an object is zero, what can you conclude?

Compare How does the current model of the atom differ from J. J. Thomson's model?

An environmental change is occurring due to continents shifting and moving to different parts of Earth's surface. What kind of change is this?

Which best describes the climate of Antarctica? A. Humid due to low elevation B. Slowly getting colder C. The coldest place on Earth D. Low temperatures due to high elevations

How many neutron and protons are in lithium-7?

Why do chemists use the mole?