Unit Test! Flashcards
What is the Law of Conservation of Mass?
The Law of Conservation of Mass states that Matter cannot be created or destroyed only rearranged or changed.
The Mass of the products must equal the mass of the reactants
What is the difference between exothermic and endothermic reactions?
Endothermic - energy is taken in or absorbed
Exothermic - energy is released or given off
What is a “manipulated variable” in an experiment?
The manipulated variable is the thing that’s changing
What are the three types of reactions with oxygen?
- corrosion
- cellular respiration
- combustion
What kind of air conditions has the lowest moisture?
Cool and dry conditions are going to cause things to rust the slowest.
What’s the difference between a physical and chemical change?
Physical Change- changing state but the particles change the same
Chemical Change- a new substance is being produced, so the particles change
Where do you find the charges on an element in the periodic table?
Top right corner of the element
What does the Roman Numeral mean on an ionic compound?
It tells you the number of the charge.
How do you calculate the number of NEUTRONS in an element?
Take your mass number and subtract the atomic number
What’s the difference between family/groups and periods/orbits and what are some characteristics that elements have in each?
The horizontal rows are called periods or orbits: The characteristics of the elements in a period or group change as you go left to right… also the atomic mass increases as you go left to right
The vertical columns are called families or groups: The elements in a family or group tend to have similar characteristics
How do you find the number of ELECTRONS in an element?
Electrons are found by the atomic number
How do you find the number of PROTONS in an element?
Protons are found by the atomic number
Where are the metals and nonmetals are found on a periodic table? (numerical response)
Metals are to the LEFT of the staircase.
Non-metals are to the RIGHT of the staircase.
Metalloids are ON the staircase
What are the four indicators of a chemical change?
A change in color
A change in odour
Forming a solid or gas
Release or absorption of heat energy
What is the most recent theory of matter and what does it say?
Quantum Mechanics model. It says the electrons are in a cloud surrounding the nucleus.
