END OF SEMESTER 1 CHEMISTRY EXAM

Front

What is the electron configuration for an atom with the configuration 1s² 2s² 2p⁶ 3s¹?

Back

The electron configuration indicates that the atom has 11 electrons, which corresponds to sodium (Na).

Front

Atoms of the same element must always have the same number of _________.

Back

Protons.

Front

What does it mean for a measurement to have high accuracy and high precision?

Back

High accuracy means the measurement is close to the true value, and high precision means repeated measurements yield similar results.

Front

Why does beta decay occur?

Back

The proton to neutron ratio is unstable.

Front

What is a chain reaction?

Back

A series of reactions that happen simultaneously and release energy.

Front

Define isotopes.

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in an atom and defines the element.

Front

Explain the concept of half-life in radioactive decay.

Back

Half-life is the time required for half of the radioactive atoms in a sample to decay.

Front

What is the difference between accuracy and precision?

Back

Accuracy refers to how close a measurement is to the true value, while precision refers to the consistency of repeated measurements.

Front

What is a covalent bond?

Back

A covalent bond is a chemical bond formed by the sharing of electron pairs between atoms.