natural science

What is the basic unit of life according to cell theory?

The cell is the basic unit of life.

List one key point of the cell theory.

All living organisms are made of one or more cells.

What organelles do plant cells have that animal cells do not?

Plant cells have a cell wall and chloroplasts.

What is the function of the mitochondria?

The site of cellular respiration where energy (ATP) is produced.

What are the three main subatomic particles?

Protons, neutrons, and electrons.

What does the atomic number ($Z$) represent?

The number of protons in the nucleus.

According to the law of conservation of mass, what happens to mass in a chemical reaction?

Mass cannot be created or destroyed, so it must be balanced in equations.

Define force in the context of physics.

A push or pull on an object, measured in Newtons (N).

What is weight and how is it calculated?

Weight is the gravitational force acting on an object's mass, calculated by the formula W = m × g.

What is the formula for work in physics?

W_work = F × d.

Explain what power measures in terms of work.

Power is the rate at which work is done.

What are groups in the periodic table?

Vertical columns showing elements with similar chemical properties.

Explain the significance of the mass number ($A$).

The total number of protons and neutrons.