SNC1W Chem/Phys changes and properties

Flammability (burns)

• Physical Property

• Chemical Property

Answer explanation

Flammability is a chemical property because it describes a substance's ability to undergo a chemical change when exposed to fire, resulting in combustion. Physical properties do not involve such changes.

Solubility (dissolves)

• Physical Property

• Chemical Property

Answer explanation

Solubility refers to a substance's ability to dissolve in a solvent, which is a characteristic that can be observed without changing the substance's chemical identity. Therefore, it is classified as a physical property.

What is matter?

• a pure substance

• anything that occupies space and possesses mass

• an element

• a compound

Answer explanation

Matter is defined as anything that occupies space and possesses mass. This includes all physical substances, making the correct choice 'anything that occupies space and possesses mass', rather than just pure substances, elements, or compounds.

The ability to rust is this type of property:

• Physical property

• Chemical property

Answer explanation

The ability to rust is a chemical property because it involves a chemical reaction between iron and oxygen, resulting in the formation of rust (iron oxide). This distinguishes it from physical properties, which do not involve such reactions.

Properties that can be observed without trying to change the identity of the substance.

• Physical

• Chemical

Answer explanation

The correct answer is 'Physical' because physical properties can be observed without altering the substance's identity, such as color, melting point, and density, unlike chemical properties which involve changes in composition.

Broken glass is:

• Chemical change

• Physical change

Answer explanation

Broken glass is a physical change because it alters the form of the glass without changing its chemical composition. The glass can be reformed, which distinguishes it from a chemical change where new substances are created.

Melting butter for popcorn is a:

• Chemical change

• Physical change

Answer explanation

Melting butter is a physical change because it alters the state from solid to liquid without changing its chemical composition. The butter can solidify again, demonstrating that no new substance is formed.

A change in which new substances are formed.

• Chemical change

• Physical change

Answer explanation

A chemical change involves a transformation that results in the formation of new substances, unlike a physical change, which only alters the form or appearance without changing the substance itself.

The ability to be hammered or rolled into thin sheets.

• Magnetism

• Malleability

• Ductility

• Electrical conductivity

Answer explanation

Malleability is the property that allows a material to be hammered or rolled into thin sheets. This distinguishes it from ductility, which refers to stretching into wires, and other options like magnetism and electrical conductivity.

Is wood burning a physical or chemical change?

• Physical 

• Chemical

Answer explanation

Wood burning is a chemical change because it involves a reaction with oxygen, producing new substances like ash and gases, and releasing energy in the form of heat and light.