Pre-Lab: Chemical and Physical Properties

What are physical properties?

Characteristics that matter shows without changing into or interacting with another substance

When does a physical change occur?

When a substance alters its physical properties

What are chemical properties?

Characteristics that matter shows as it changes into or interacts with other substance(s)

What is another term for a chemical change?

A chemical reaction

When does a chemical change occur?

When a substance is converted into a different substance

Which physical properties are we going to observe?

Solubility in water and another chemical, smell, color, viscosity, density, and freezing/boiling points

Which chemical property are we going to observe?

Flammability

What is a qualitative observation?

An observation that doesn’t have any numbers associated with the data

What is a quantitative observation?

An observation that has numbers associated with the data

How are we going to test the flammability of the substances?

By dropping a lighted match into the substances within an evaporating dish

What is the first thing you want to do with any solution?

Pick up the bottle and gently shake it

Which hand do you grab the bottle with?

Your non-dominant hand

What do you definitely not do if you overfill your graduated cylinder?

Pour the substance back into the dispensing bottle

What should you do if you overfill your graduated cylinder?

Pour the excess into a smaller beaker

How do you dispose of substances at the end of the experiment?

Pour everything back into the large beaker

Why can it be useful to hold all of the chemical within your hand?

It increases the temperature so more vapor comes out

What do you need to do for cardboard matches?

Hold the tip of the match with the cardboard flap of the box to increase the friction