Classify Matter
Classify the following substance:
Fe
Atom/Element
Mass, Length, Volume, Height are all examples of what type of property?
Extensive Properties
Reactivity, Flammability, Corrosivity, Oxidation, Chemical Bonding Types, etc. are all types what property?
Chemical Properties
A crystal vase is dropped and shatters.
Physical Change (the identity of the substance does not change)
False: Bubbles forming from heat added is not a sign of chemical change.
Classify the following substance:
PO4
Compound
Copper is ductile, which means it has the ability to be drawn out into wire. Ductility is an _________________ property.
Intensive Property
Sulfuric acid is highly reactive and very corrosive. Is this a physical or chemical property of sulfuric acid?
Chemical Properties
Burning wooden logs in a fire.
Chemical change (identity of the wood changes as it burns)
True or False: Red dye and blue dye are mixed together and form a purple liquid. This color change symbolized a chemical change.
False: Blue and red dye mix to create purple. This change is not chemical, its just colors mixing.
Classify the following substance:
PO4 + KOH
Mixture
Which of the following properties is an INTENSIVE property?
3.0 mL, 6.7 g, 9.9 cm3, 2.4 g/cm3
2.4 g/cm3 is a DENSITY, which is a ratio of mass to volume so the amount of matter present DOES NOT matter.
Identify the physical properties about acetone from the following list:
Boiling point of 56oC, strong smell, covalent bonding, highly flammable, clear color.
Boiling point of 56oC, strong smell, clear color
Identity does not change in order to determine the property.
Liquid propane evaporates into gas.
Physical change (the identity does not change, only the state of matter).
When rust forms on a car, a chemical change has occurred. What sign of chemical change occurs when rust forms.
Color change
Classify the following substance and identify the number of particles present:
2 P5
Element; 2 particles
Determine the EXTENSIVE properties from the following properties of Titanium:
Hard Metal, Density of 4.5 g/cm3, Shiny luster, Volume of 32.9 cm3, Mass of 207.8 g
Volume of 32.9 cm3 & Mass of 207.8 g
The amount of matter matters for Extensive Properties.
Acetone has a freezing point of -95o C. Is this a physical or chemical property?
Physical Property- the identity of the substance is the same before and after freezing. Liquid acetone -> solid acetone.
Sodium hydroxide solid is added to water and it heats up and bubbles. What type of change is this and how do you know?
Chemical change because of the bubbles produced and the temperature change, which are signs of chemical reaction taking place.
A powdery substance is tossed into a fire. The flames turn purple and a popping noise (energy) is created. Determine two signs of a chemical change occurring in this scenario.
1. Color change
2. Energy (noise) being produced.
Classify the following substance and identify the total number of particles and the total number of atoms present:
2 Cr + 3 ZnO
Mixture; 5 particles; 8 atoms
Give two examples of both Intensive and Extensive Properties.
Intensive: Density, Color, Temperature, Luster, Boiling Point, etc. (Amount does not matter)
Extensive: Volume, mass, length, quantity, etc. (Amount matters)
Give two examples of both Physical and Chemical Properties
Physical: Boiling point, hardness, shine, luster, temperature, etc. (Identity of substance does not change)
Chemical: Reactivity, corrosivity, toxicity, chemical bonding, etc. (The identity of the substance does change.)
Give two examples of a chemical change and two examples of a physical change.
**Examples, not signs of chemical change!**
Physical: (Varying answers) Phase changes, Breaking, filtering, cutting things apart, folding things, etc.
Chemical: (Varying answers) Fruit rotting, metal rusting, cooking/ baking food, reactions where substances change, etc.
Name all 5 signs of a chemical change.
Color change, temperature change, bubbles forming, a solid forming, light being produced