8th Grade physical Science Review

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties.

Front

Which element has properties similar to bromine (Br)?

Back

Fluorine (F) has properties most similar to bromine (Br).

Front

What happens to an object's mass and weight when it is moved from Earth to Mars?

Back

The object's mass remains the same, but its weight decreases due to Mars having a weaker gravitational pull.

Front

What is fuel efficiency in automobiles?

Back

Fuel efficiency refers to how effectively a vehicle converts fuel into motion, often expressed as a percentage of the fuel's chemical energy that is used for movement.

Front

Why do modern vehicles only achieve about 30% fuel efficiency?

Back

Much of the energy from fuel is transformed into heat rather than being used for motion.

Front

What is the significance of the three-domain system of classification?

Back

The three-domain system reflects changes in scientific understanding as new evidence arises, showing that scientific theories can evolve.

Front

What is an atom?

Back

An atom is the smallest particle of an element that retains the element's chemical properties.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What are Archaebacteria?

Back

Archaebacteria are a group of microorganisms that were discovered in the 1970s, leading to changes in the classification of living organisms.

Front

What is chemical energy?

Back

Chemical energy is the energy stored in the bonds of chemical compounds, which can be released during a chemical reaction.