What characteristics identify a substance?

Color

Is everything that is the same color the same substance?

Can color be used to identify a substance?

Combustion

What is burning when the candle is lit?

What is in the smoke that causes the candle to re-light?

C31H64(s) + O2(g) CO2(g) + H2O(g)

The heat from the flame melts the paraffin andthen it continues to heat up until it turns into a gas.

Hardness

Does the amount or size of the sample affect the result of the scratch test?

Density

Does the amount of a substance affect the density?

Al Al

Pb

Pb

Mass

Is the mass of a substance always the same?

Can objects with the same mass be different substances?

Reactivity

NaCl(s) +CH₃COOH(l) no reaction

What observations?(bubbles, color change, cloudy, temperature change)

Reactivity

What observations?(bubbles, color change, cloudy, temperature change)

NaOH(s) +CH₃COOH(l) CO2(g) + H2O(l) + Na⁺ + HCO3⁻

Malleable

Do all substances bend the same?

Do the same samples bend the same?

Is the bending dependent on the amount of substance?

What is Sn? What is Zn?

Corrosive

Fe(s) + O2(g) FeO(s)

Cu(s) + O2(g) CuO(s)

So how do we answer the question?

What properties can help identify a substance?

Are some properties better than others for identifying substances?

What makes those properties better at identifying substances?

1. Use the vocabulary and label each property with the correct categories.

2. Use the questions at the right to guide your summary.

3. Complete the exit slip and turn it in to the teacher.