2024 Fall Mid-Term Review

Front

What is the correct equation for U-238 decay?

Back

True

Front

What does VSEPR theory predict?

Back

Molecular Shape

Front

What is the chemical name for SiCl4?

Back

Silicon tetrachloride

Front

What must an electron do to go from ground state to an excited state?

Back

Absorb energy

Front

What conclusions can be drawn from Rutherford’s gold foil experiment?

Back

All answers are correct: Atom is mostly empty space, The nucleus is positively charged, The atom has a small dense nucleus.

Front

What is the definition of a half-life in radioactive decay?

Back

The time required for half of the radioactive atoms in a sample to decay.

Front

What is the principle behind the VSEPR theory?

Back

Molecules adopt shapes that minimize repulsion between electron pairs.

Front

What is the significance of the nucleus in an atom?

Back

It contains protons and neutrons, and is positively charged.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Front

What is electronegativity?

Back

A measure of the tendency of an atom to attract a bonding pair of electrons.