EOY 7th Grade Science Review

Front

What is a compound in chemistry?

Back

A compound is a substance formed when two or more chemical elements are chemically bonded together. For example, C₂O₆ is a compound.

Front

What is the difference between autotrophs and heterotrophs?

Back

Autotrophs are organisms that make their own energy through processes like photosynthesis, while heterotrophs must consume other organisms for energy.

Front

How many hydrogen atoms are in 10 molecules of methane (CH₄) and 20 molecules of water vapor (H₂O)?

Back

There are 80 hydrogen atoms in total: 10 CH₄ contributes 40 H atoms and 20 H₂O contributes 40 H atoms.

Front

What type of tectonic plate boundary causes plates to pull apart?

Back

Divergent boundaries cause tectonic plates to pull apart, leading to the formation of new crust.

Front

What is the average speed of a car that travels 48 km in 60 minutes?

Back

The average speed is 0.8 km/min.

Front

Define autotroph.

Back

An autotroph is an organism that produces its own food from inorganic substances, using light or chemical energy.

Front

Define heterotroph.

Back

A heterotroph is an organism that cannot produce its own food and instead consumes other organisms for energy.

Front

What is the chemical formula for methane?

Back

The chemical formula for methane is CH₄.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O.

Front

What happens at convergent tectonic plate boundaries?

Back

At convergent boundaries, tectonic plates move towards each other, often causing one plate to be forced below another, leading to subduction.