Elements & Compounds
What is a substance that cannot be broken down into simpler substances?
Element
What is the first step in count atoms?
Identify the elements first
What acronym do we use to remember the 5 signs of a chemical change?
Please
Excuse my
Cough
Sneezes &
Farts
What is a solution?
A solution is a mixture of a solute and a solvent.
What is conduction?
a type of heat transfer that requires items to touch.
What is a chemical symbol?
A capital letter or a capital letter followed by a lowercase letter that represents an element.
A subscript is...
a number that hangs in a chemical formula as it follows the element symbol.
H3
What does each of the letters in the acronym (PECSF)stand for?
Precipatate
Energy Exchange
Color Change (unexpected)
Smell(new)
Formation of gas (bubbles)
What factors affect the rate of dissolution of a solid in a liquid?
temperature, agitation, and surface area
What is radiation?
The type of thermal energy transfer that moves in waves
What is a compound?
A compound is a substance made of 2 or more elements.
H2O
3
Give an example of a chemical change.
rusting, baking, oxidation
How does temperature affect the solubility of a substance?
Heating the solvent increase the saturation levels of the solvent.
Describe convection and provide an example.
Convection the the type of thermal energy transfer that uses currents to move warmer items up while colder items sink.
An example would be warming a cold room.
What is a chemical formula?
A chemical formula is the written expression of a chemical using chemical symbols.
Count the atoms:
Ca(POâ‚„)â‚‚
Ca-1
P-2
O-8
total-11
What is the difference between a physical change and a chemical change?
Physical changes change the state of matter, size, or shape.
Chemical changes make something new.
What is the difference between a solute and a solvent?
Solvent- the substance that dissolves the solute.
Solute- the substance that is dissolved.
Explain the concept of thermal equilibrium.
Thermal equilibrium is when the thermal energy is balanced in a system.
example Iced tea.
Provide an example of an element and a compound.
examples could be:
element = oxygen
compound = water.
Find the total number of atoms.
3Ca(OH)â‚‚
3Ca(OH)â‚‚
Ca-3
O-6
H-6
total-15
Provide an example of a time when both a physical and chemical change happened at the same time.
apple pie,
digesting
What is the universal solvent?
water
Justify why temperature is related to kinetic energy.
The more an object moves or the faster it moves, the temperature of the object will increase. The slower the object moves, the temperature will decrease.