PS1.A Flashcard

Front

Why are metals good conductors of electricity?

Back

They have free-moving electrons in a 'sea of electrons.'

Front

What happens to the particles in a substance during a phase change from liquid to gas?

Back

They gain energy and move further apart.

Front

Which material is better for aircraft: Material A with a density of 2.7 g/cm³ or Material B with a density of 7.8 g/cm³?

Back

Material A, because lower density reduces weight.

Front

Which subatomic particle determines the identity of an element?

Back

Proton

Front

What is the difference between isotopes of the same element?

Back

Number of neutrons.

Front

What is the definition of density?

Back

Density is mass per unit volume, typically expressed in g/cm³.

Front

What is the role of protons in an atom?

Back

Protons determine the atomic number and identity of an element.

Front

What is a phase change?

Back

A phase change is the transition of a substance from one state of matter to another, such as solid to liquid.

Front

What is the significance of free electrons in metals?

Back

Free electrons allow metals to conduct electricity and heat efficiently.

Front

How do isotopes differ in terms of stability?

Back

Isotopes can vary in stability; some are stable while others are radioactive.