The particle model (P1.1) | OCR GCSE Combined Science A (Gateway Science) — Physics — Higher (J250)

P1.1 The particle model

Summary Knowledge and understanding of the particle nature of matter is fundamental to physics. Learners need to have an appreciation of matter in its different forms, they must also be aware of subatomic particles, their relative charges, masses and positions inside the atom. The structure and nature of atoms are essential to the further understanding of physics. The knowledge of subatomic particles is needed to explain many phenomena, for example the transfer of charge, as well as radioactivity. (Much of this content overlaps with that in the GCSE (9–1) in Chemistry A (Gateway).) Underlying knowledge and understanding Learners should be aware of the atomic model, and that atoms are examples of particles. They should also know the difference between atoms, molecules and

compounds. Learners should understand how density can be affected by the state materials are in. Common misconceptions Learners commonly confuse the different types of particles (subatomic particles, atoms and molecules) which can be addressed through the teaching of this topic. They commonly misunderstand the conversions between different units used in the measurement of volume.

Reference	Mathematical learning outcomes	Maths skills
$PM1.1i$	${density (kg/m}^{}$

recall and apply:

{density (kg/m}^{}

M1a, M1b, M1c, M3b, M3c, M5c

Learning outcomes	To include	Maths	Working scientifically	Practical suggestions
$P1.1a describe how and why the atomic model has changed over time$	$the Thomson, Rutherford (alongside Geiger and Marsden) and Bohr models$	$M5b$	$WS1.1a, WS1.1c, WS1.1g$	$Timeline showing the development of atomic theory. Discussion of the different roles played in developing the atomic model and how different scientists worked together.$
$P1.1b describe the atom as a positively charged nucleus surrounded by negatively charged electrons, with the nuclear radius much smaller than that of the atom and with almost all of the mass in the nucleus$		$M5b$	$WS 1.1b$	$Model making (including 3D) of atomic structures.$
$P1.1c recall the typical size (order of magnitude) of atoms and small molecules$	$knowledge that it is typically 1 \times 10-10 m$	$M1b$	$WS1.1d$
$P1.1d define density$			$WS1.2b, WS1.2c, WS1.3c, WS1.3d, WS1.4a, WS1.4b, WS1.4e, WS1.4f, WS2a, WS2b, WS2c, WS2d$	$Measurement of length, volume and mass and using them to calculate density. (PAG P1) Investigation of Archimedes’ Principle using eureka cans. (PAG P1)$
$P1.1e explain the differences in density between the different states of matter in terms of the arrangements of the atoms and molecules$		$M5b$	$WS1.1b$
$P1.1f apply the relationship between density, mass and volume to changes where mass is conserved$		$M1a, M1b, M1c, M3c$

P1.1a describe how and why the atomic model has changed over time

the Thomson, Rutherford (alongside Geiger and Marsden) and Bohr models

WS1.1a, WS1.1c, WS1.1g

Timeline showing the development of atomic theory. Discussion of the different roles played in developing the atomic model and how different scientists worked together.

P1.1b describe the atom as a positively charged nucleus surrounded by negatively charged electrons, with the nuclear radius much smaller than that of the atom and with almost all of the mass in the nucleus

Model making (including 3D) of atomic structures.

P1.1c recall the typical size (order of magnitude) of atoms and small molecules

knowledge that it is typically 1 × 10–10 m

P1.1d define density

WS1.2b, WS1.2c, WS1.3c, WS1.3d, WS1.4a, WS1.4b, WS1.4e, WS1.4f, WS2a, WS2b, WS2c, WS2d

Measurement of length, volume and mass and using them to calculate density. (PAG P1) Investigation of Archimedes’ Principle using eureka cans. (PAG P1)

P1.1e explain the differences in density between the different states of matter in terms of the arrangements of the atoms and molecules

P1.1f apply the relationship between density, mass and volume to changes where mass is conserved

The particle model

Next Steps

Learning Objectives