Biology S1 Exam Review set 3

Front

Who concluded that atoms of different elements have different masses?

Back

John Dalton is known for concluding that atoms of different elements have different masses, which advanced the study of chemistry.

Front

What did J. J. Thomson conclude about atoms?

Back

J. J. Thomson concluded that every atom contained small, negatively charged particles.

Front

What is the act of comparing an unknown quantity to a standard unit called?

Back

The act of comparing an unknown quantity to a standard unit is known as measurement.

Front

Why is an orderly process for problem solving important?

Back

An orderly process for problem solving is important because it helps in identifying the problem clearly.

Front

What factors can negatively affect precision in measurements?

Back

Factors that can negatively affect precision in measurements include environmental conditions, instrument calibration, operator skill, and material quality.

Front

Define 'atom'.

Back

An atom is the smallest unit of an element that retains the properties of that element.

Front

What is the significance of John Dalton's atomic theory?

Back

John Dalton's atomic theory laid the groundwork for modern chemistry by proposing that matter is made up of atoms, which are indivisible and combine in fixed ratios.

Front

What are negatively charged particles in an atom called?

Back

Negatively charged particles in an atom are called electrons.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is the purpose of instrument calibration?

Back

Instrument calibration is performed to ensure that measuring instruments provide accurate and precise measurements.