General Science: Physics and Chemistry Concepts Flashcards

Which of the following is an example of a chemical change?

Answer: Iron rusting

Iron rusting is a chemical change because it produces a new substance (iron oxide) through oxidation.

What is the unit of electrical resistance?

Answer: Ohm

Electrical resistance is measured in ohms (Ω), as defined by Ohm's law (V = IR).

According to Newton's Third Law, when you push a wall, the wall pushes back with:

Answer: An equal and opposite force

Newton's Third Law states every action has an equal and opposite reaction, so the wall exerts an equal force back.

What is the atomic number of an element?

Answer: The number of protons in the nucleus

The atomic number equals the number of protons in the nucleus and uniquely identifies each element.

Which state of matter has a definite volume but no definite shape?

Answer: Liquid

Liquids have a definite volume but take the shape of their container, unlike solids (fixed shape) or gases (no fixed volume).

What is the speed of light in a vacuum approximately equal to?

Answer: 3 × 10⁸ m/s

The speed of light in a vacuum is approximately 3 × 10⁸ meters per second (about 186,000 miles per second).

In a series circuit with two resistors, how does the total resistance compare to each individual resistor?

Answer: It equals the sum of both resistors

In a series circuit, total resistance = R₁ + R₂; resistances simply add together.