Laboratory Safety and Tools Flashcard

Front

What is the definition of accuracy in scientific measurements?

Back

Accuracy refers to how close a measured value is to the actual (true) value.

Front

What is the definition of precision in scientific measurements?

Back

Precision refers to the consistency of repeated measurements, regardless of whether they are close to the true value.

Front

According to the octet rule, how many electrons do most elements need in their outer energy level for stability?

Back

8 electrons.

Front

What are electrons?

Back

Electrons are energetic particles that move in all directions around the nucleus of an atom.

Front

How many energy levels do the electrons in an atom of silver occupy?

Back

5 energy levels.

Front

What are 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 atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What is a chemical bond?

Back

A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds.

Front

What is the difference between a covalent bond and an ionic bond?

Back

A covalent bond involves the sharing of electron pairs between atoms, while an ionic bond involves the transfer of electrons from one atom to another.