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A1.1 WaterKnowledge & lessons

Learning · 1 of 1

Water Is a Medium

Water is useful because it acts as an aqueous medium: substances dissolve, move, and react in it.

Early oceans gave first cells liquid conditions and UV shielding.
Water remains the medium for most life processes and forms much of cell mass.

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1.3 Electron configurationsKnowledge & lessons

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1.3.3—Main energy levels

Integer n holds a maximum of 2n² electrons.
Deduce the maximum electrons in each main energy level.

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A.2 Forces and momentumKnowledge & lessons

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Impulse and change in momentum

The applied external impulse equals the change in momentum of the system.

$J = F\Delta t = \Delta p$

[1 mark]

An object of mass 5.0 kg is initially at rest. An impulse of 2.0 Ns acts on the object. What is the final kinetic energy of the object?

IB Physics · Paper 29749

[Maximum number: 1]

1.

An object of mass 5.0 kg is initially at rest. An impulse of 2.0 Ns acts on the object. What is the final kinetic energy of the object?

A

$0.40 \mathrm{~J}$

B

10 J

C

20 J

D

40 J

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SL 2.6 Quadratic functionsKnowledge & lessons

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SL 2.6—Quadratic functions

Use standard, factorized and vertex forms of quadratic functions.
Interpret y-intercept, x-intercepts, axis of symmetry and vertex.
Convert between quadratic forms.

Express the quadratic $3 x^{2}-6 x+5$ in the form $a(x+b)^{2}+c$ , where $a, b, c \in \mathbb{Z}$ .

IB Math · Paper 17786

[Maximum number: 3]

1.

Express the quadratic $3 x^{2}-6 x+5$ in the form $a(x+b)^{2}+c$ , where $a, b, c \in \mathbb{Z}$ .

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2.8 Externalities and welfare lossKnowledge & lessons

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2.8.2—Externalities and welfare loss

Positive externalities of production or consumption create under-allocation without intervention.
Negative externalities of production or consumption create over-allocation without intervention.
Merit goods and demerit goods are linked to positive and negative externality cases.