DSST Physical Sciences 5

Question 1

Which gas law relates volume directly to temperature at constant pressure?

Accepted Answer

Charles's Law

Answer

Charles's Law states that V/T = constant when pressure is held fixed (V and T must be in absolute units).

Question 2

What is the term for the energy required to remove one electron from a gaseous atom?

Accepted Answer

Ionization energy

Answer

Ionization energy is the minimum energy needed to remove the outermost electron from a neutral gaseous atom.

Question 3

A 60 W light bulb operates for 10 hours. How much energy does it consume in joules?

Accepted Answer

2,160,000 J

Answer

Energy = Power × Time = 60 W × 36,000 s = 2,160,000 J.

Question 4

Which subatomic particle determines the chemical identity of an element?

Accepted Answer

Proton

Answer

The number of protons (atomic number) uniquely identifies each element on the periodic table.

Question 5

What type of reaction produces heat as a product?

Accepted Answer

Exothermic

Answer

Exothermic reactions release energy to the surroundings, causing the temperature of the environment to rise.

DSST - DANTES Subject Standardized Tests Practice Test