CSET CSET Physical Sciences: Physics and Chemistry 2

Question 1

What is the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed

Answer

The law of conservation of energy states that the total energy of an isolated system remains constant—energy can only change form.

Question 2

On the periodic table, elements in the same group (column) share similar:

Accepted Answer

Chemical properties

Answer

Elements in the same group have the same number of valence electrons, giving them similar chemical properties.

Question 3

What is the pH of a neutral solution at 25°C?

Accepted Answer

7

Answer

A neutral solution has equal concentrations of H⁺ and OH⁻ ions, corresponding to a pH of 7.

Question 4

Which of the following is an example of potential energy?

Accepted Answer

A book resting on a shelf

Answer

A book on a shelf has gravitational potential energy due to its position above the ground.

Question 5

The speed of light in a vacuum is approximately:

Accepted Answer

3 × 10⁸ m/s

Answer

The speed of light in a vacuum is approximately 3 × 10⁸ meters per second (about 300,000 km/s).

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