Change of State, Physical Change vs Chemical Change, Composition of Matter, Characteristic Physical Properties Flashcards
A change of state involves…
The addition or removal of heat energy
What is Liquefication?
Melting (solid to liquid)
What is vaporization?
Liquid to gas
What is condensation?
Gas to liquid
What is solidification?
Liquid to solid
What is sublimation?
Liquid to gas or gas to liquid
What is thermal expansion?
When heat is applied, particles move fast, and push away taking up more space
What is a physical change?
Alters the form of a substance without changing it into another substance
What is chemical change?
The substance is changed into a different substance with different properties
What are the 6 signs of chemical change?
- Colour change
- Precipitate-the solid that forms from a solution during a chemical reaction
- Gas production (bubbles)
- Temperature change
- Changes in characteristic properties
- Difficult to reverse
Mixtures contain at least ______ different substances that ______ be separated by physical means
two
can
If pure substances mix very well with one another so well that you cannot see the parts, what is it called?
A solution
The substance that does the dissolving is the…
Solvent
The substance that gets dissolved is the…
Solute
If pure substances don’t mix well with one another and you can see the different parts, what is it called?
A mechanical mixture
When different atoms join together what does it create?
A molecule of a compound
What is the equation for density of a substance?
Density= mass/volume
What is the equation for mass?
Mass= densityXvolume
What is the equation for volume?
Volume= mass/density
What is density?
The amount of matter per unit volume
What is mass?
Amount of matter (g or kg)
What is volume?
The amount of space (cm3, m3, mL, L)
What is slope?
Rise/run
On a graph, where does the volume go, x-axis or y-axis?
X-axis
On a graph, where does mass go, on the x-axis or the y-axis?
Y-axis
What happens when evaporation occurs?
Particles have gained enough energy to break away from clump
What happens when solidification occurs?
Heat energy is removed, particles move slow, less collisions and decrease in volume
What do pure substances contain?
Only one kind of particle [Atom or molecule] it’s components cannot be separated by physical methods
What is a “Pure substance that cannot be broken down under ordinary chemical means. The smallest particle in an element is the atom”
Element
What are “Pure substances that contain two or more different elements combined.they can only be separated by chemical means”
Compound
What is “the smallest part of a compound that still has the properties of the compound”
Molecule
What are “Properties unique to only one substance that can be used to identify or classify it”
Characteristical physical properties
What is 1 cm³ equal to in volume?
1 mL
How do you convert grams to kilograms?
Divided by 1000
You convert kilograms to grams?
Multiply by 1000
How do you convert 1 g/cm³ to kg/m³ or 1 g/1 mL to kg/L?
Multiply by 1000
How do you convert kg/m³ to g/cm³ or kg/L to g/mL?
Divided by 1000
