STEM Science Content Knowledge

Question 1

What is the primary concept of Newton's first law of motion?

Accepted Answer

An object will stay in motion unless an external force acts on it

Answer

Newton's first law of motion, also known as the law of inertia, states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. This means that a moving object will continue its motion indefinitely if no unbalanced force intervenes to change its speed or direction.

Question 2

What is the process of photosynthesis in plants?

Accepted Answer

It uses sunlight, carbon dioxide, and water to produce glucose and oxygen

Answer

Photosynthesis is the vital process by which green plants, algae, and some bacteria convert light energy into chemical energy. They use sunlight, carbon dioxide from the air, and water from the soil to synthesize glucose (a sugar for energy) and release oxygen as a byproduct, which is essential for most life on Earth.

Question 3

What is the molecular basis of inheritance?

Accepted Answer

DNA stores and transmits genetic information

Answer

DNA (deoxyribonucleic acid) is the primary molecule responsible for storing and transmitting genetic information in nearly all living organisms. Its unique double helix structure allows it to carry the instructions for an organism's development, functioning, growth, and reproduction, passing these traits from one generation to the next.

Question 4

What is the law of conservation of mass?

Accepted Answer

The total mass of products equals the total mass of reactants

Answer

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. This fundamental principle means that the total mass of the reactants before a chemical reaction must exactly equal the total mass of the products after the reaction.

Question 5

What is the periodic table used for in chemistry?

Accepted Answer

It groups elements based on their chemical properties

Answer

The periodic table is a systematic arrangement of chemical elements, primarily organized by increasing atomic number. Its structure groups elements with similar chemical properties into columns (groups), allowing chemists to predict an element's behavior based on its position and understand relationships between different elements.

(STEM) Certified Science Technology Engineering Mathematics Educator Practice Test

(STEM) Certified Science Technology Engineering Mathematics Educator Practice Test

STEM Science Content Knowledge