Combined Science Flashcards

What is the process by which a liquid changes into a gas?

Answer: Evaporation

Evaporation is the process by which a liquid changes into a gas at the surface of the liquid. It can occur at temperatures below the boiling point.

What is an atom?

Answer: The smallest part of an element that retains the chemical properties of that element

An atom is the smallest unit of an element that retains the chemical properties of that element. It consists of protons, neutrons, and electrons.

Which type of diet is essential for good health?

Answer: A balanced diet with carbohydrates, proteins, fats, vitamins, minerals, and water

A balanced diet includes all essential nutrients in the right proportions: carbohydrates (energy), proteins (growth/repair), fats (energy store), vitamins and minerals (body functions), and water.

What does a voltmeter measure?

Answer: Voltage (potential difference)

A voltmeter measures the voltage (potential difference) across two points in a circuit. It is connected in parallel.

What is the function of the lungs?

Answer: To exchange gases — absorbing oxygen and releasing carbon dioxide

The lungs are the organs of gas exchange — oxygen from inhaled air enters the blood, and carbon dioxide from the blood is exhaled.

What is friction?

Answer: A force that opposes motion between surfaces in contact

Friction is a force that opposes the relative motion of two surfaces in contact. It can be useful (preventing slipping) or a hindrance (reducing efficiency).