CMS First Semester Exam Review

Front

What is photosynthesis?

Back

Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy in the form of glucose, using carbon dioxide and water.

Front

What is cellular respiration?

Back

Cellular respiration is the process by which cells convert glucose and oxygen into energy (ATP), carbon dioxide, and water.

Front

What is the carbon cycle?

Back

The carbon cycle is the series of processes by which carbon compounds are interconverted in the environment, including photosynthesis, respiration, and decomposition.

Front

What is density?

Back

Density is the mass of an object divided by its volume, often expressed in grams per cubic centimeter (g/cm³). It determines whether an object will float or sink in a fluid.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What happens when wood is chopped for a bonfire?

Back

Chopping wood is a physical change because it alters the size and shape of the wood without changing its chemical composition.

Front

How many atoms of oxygen are in one molecule of carbon dioxide (CO₂)?

Back

There are 2 atoms of oxygen in one molecule of carbon dioxide.

Front

How many atoms of oxygen are in four molecules of carbon dioxide (4CO₂)?

Back

There are 8 atoms of oxygen in four molecules of carbon dioxide (4 x 2 = 8).

Front

What is oxidation?

Back

Oxidation is a chemical reaction that involves the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.