Chemical Properties
What chemical property is associated with adding oxygen to a substance?
Oxidation
Define: physical property
A property of matter that can be measured without changing the identity of an object.
Any change to a substance that results in the formation of a new substance.
density, change of state, thermal conductivity, malleability, ductility, solubility
What is Ms. G's favorite color? (I told you in the first week of school)
Pink
When something reacts with oxygen that leads to a combustion reaction.
Heat of combustion
What physical property mathematically relates mass and volume?
Density
List 5 indications that a chemical reaction has occurred
formation of a precipitate, formation of a gas, release of heat, release of light and sound, change of color, smell.
Define: physical change
Any change to a type of matter that does not change its molecular composition
What geometric shape is used for stop signs?
Octagon
Define: Chemical Property
The change from one substance to another at a molecular level.
Sugar has dissolved in water. What physical property is this?
solubility
Why are changes in state not a chemical change?
Because the original substance can be recovered.
Whats an extensive property?
A property that does not depend on the amount of matter present (mass, volume, length, shape)
This ghost type pokemon is said to be the soul of a woman who was trapped on an icy mountain.
Froslass
What must we observe first to identify a chemical property?
A chemical reaction
Can color be a physical property?
Yes. Apples are red. Bananas are yellow.
Blue Pea Flower Tea is made from naturally purple leaves. The brewed tea is a lovely purple-ish color. When those leaves come into contact with lemon juice, they turn pink. When they come into contact with milk, they turn blue. Is this chemical or physical change?
Chemical. Color change is an indication of a change at a molecular level.
What change of state of water involves a solid turning to a gas?
deposition
Which country has proclaimed their national animal a unicorn?
Scotland
heat of combustion, toxicity, corrosivity, coordination number, oxidation, flammability, chemical bonding
If water has a density of 1g/mL, and an unknown substance has a density of 1.24g/mL, upon mixing them, what do you expect to happen?
Water will float.
Why is baking a cake a chemical change?
because there is a change occurring at a molecular level to the ingredients used in the cake!
Boiling a substance often can lead to breaking bonds in molecules. Why is this considered a physical property and not a change?
Because each element has a "boiling point" which means that there is a certain temperature it can physically reach before it changes
In Autumn, the chlorophyll (the green pigment in leaves) starts to disappear and excess sugar within the leaves starts to produce the reds, oranges and yellows. Using your understanding of chemical and physical properties and changes, explain this phenomena