Combined Science Flashcards

What does the pH scale measure?

Answer: How acidic or alkaline a solution is (0-14)

The pH scale measures acidity/alkalinity: 0-6 is acidic, 7 is neutral, and 8-14 is alkaline. Pure water has pH 7.

What is the unit of electrical current?

Answer: Ampere

Electric current is measured in amperes (A), often shortened to 'amps'. An ammeter measures current and is connected in series.

What is the role of the stomach in digestion?

Answer: Breaks down food using acid and enzymes

The stomach churns food and releases hydrochloric acid and enzymes (pepsin) to break down proteins. It acts as a temporary storage and processing chamber.

What is an element?

Answer: A substance made of only one type of atom, which cannot be broken down into simpler substances by chemical means

An element is a pure substance made of only one type of atom. It cannot be broken down into simpler substances by chemical reactions. Gold, oxygen, and carbon are examples.

Which force acts upward on an object submerged in a liquid?

Answer: Upthrust (buoyancy)

Upthrust (or buoyancy) is the upward force exerted by a fluid on a submerged or partially submerged object, equal to the weight of fluid displaced (Archimedes' principle).

What is the difference between a conductor and an insulator?

Answer: Conductors allow electricity to flow; insulators do not

Conductors allow electric current to flow through them (e.g., copper, aluminium) due to free electrons. Insulators prevent current flow (e.g., rubber, plastic, glass).