2024-2025 (H) Review for Flashcard #5, Semester 1

Front

What remains constant during a change of state in a substance?

Back

Temperature remains constant during a change of state because the energy absorbed or released affects the potential energy, not the kinetic energy.

Front

What is a homogeneous mixture of two liquid elements?

Back

A homogeneous mixture of two liquid elements is a mixture where the components are uniformly distributed and cannot be easily separated.

Front

How do we classify a chemical reaction that absorbs heat from its surroundings?

Back

An endothermic reaction absorbs heat, resulting in a temperature decrease in the surroundings.

Front

What is the reason sand is hotter than ocean water despite receiving the same energy from the sun?

Back

Sand has a lower specific heat than water, meaning it heats up faster than water for the same amount of energy.

Front

What type of energy change occurs during nuclear fission?

Back

Nuclear energy is released during nuclear fission when a neutron collides with a nucleus, causing it to split.

Front

Define specific heat.

Back

Specific heat is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.

Front

What is the difference between kinetic and potential energy?

Back

Kinetic energy is the energy of motion, while potential energy is stored energy based on an object's position or state.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings, causing an increase in temperature.

Front

What happens to the temperature of a substance during a phase change?

Back

The temperature of a substance remains constant during a phase change, even though energy is being absorbed or released.

Front

What is a pure solid monatomic element?

Back

A pure solid monatomic element consists of single atoms of the same element, not bonded to any other atoms.