GED Science 2

Question 1

According to Newton's Second Law of Motion, what happens to the acceleration of an object if the force applied to it is doubled while the mass stays the same?

Accepted Answer

Acceleration doubles

Answer

Newton's Second Law: F = ma, or a = F/m. If force doubles and mass is constant, acceleration doubles.

Question 2

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

Accepted Answer

A chemical change produces a new substance; a physical change does not alter chemical composition

Answer

A chemical change creates new substances with different chemical properties (e.g., burning wood). A physical change alters form or appearance but not chemical composition (e.g., cutting wood).

Question 3

Which statement correctly describes the conservation of mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction

Answer

The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction — the total mass of reactants always equals the total mass of products.

Question 4

What type of wave is a sound wave?

Accepted Answer

Longitudinal wave

Answer

Sound is a longitudinal wave — the medium's particles vibrate parallel to the direction of wave travel, creating alternating compressions and rarefactions.

Question 5

An atom has 8 protons, 8 neutrons, and 8 electrons. What element is this, and what is its atomic mass?

Accepted Answer

Oxygen with atomic mass 16

Answer

The atomic number (number of protons) = 8 identifies the element as Oxygen (O). Atomic mass ≈ protons + neutrons = 8 + 8 = 16.

GED Practice Test

GED Practice Test

GED Science 2