Physical Changes

Question 1

Physical - Lustre

Answer 1

the ability for a substance to reflect light
(lustrous, dull)

Question 1

Physical - Clarity

Answer 1

Describes the ability for a substance to allow light to pass through it
(opaque)

Question 2

Physical - Hardness

Answer 2

The ability for a substance to be scratched.
hard, soft

Question 3

Physical - Malleability

Answer 3

The ability for a substance to be bent into new shapes.
non-malleable

Question 4

Physical - Ductility

Answer 4

The ability for a substance to be pulled into long thin wires/string.
ductile

Question 5

Physical - Brittleness

Answer 5

The ability for a substance to break.

Question 6

Quantitative - Viscosity

Answer 6

Resistance of a substance to flow (how easy is it for a substance to flow
(viscous)

Question 7

Quantitative - Density

Answer 7

Number of particles (mass) in a given space (volume)

Question 8

Quantitative - Solubility

Answer 8

How easily a substance dissolves in another substance (a liquid). It dissolves if it disappears in the liquid.
(soluble)

Question 9

Quantitative - Electrical Conductivity

Answer 9

The ability for a substance to allow electricity to flow through it.

Question 10

Quantitative - Heat Conductivity

Answer 10

The ability for a substance to allow heat to flow through it.

Question 11

Evidence that a Chemical CHANGE has occured

Answer 11

colour
gas (bubbles)
odour
a new solid
Energy in the form of heat/light/sound

Question 12

Changing States with heat: physical or Chemical change?

Answer 12

physical
- When an object is heated or cooled (I.e. liquid → gas, solid → liquid, etc.) these are physical changes NOT chemical changes.

It is still the same substance, just in a different form.

Ex. ice, water and water vapour all have the same formula H2O