Grade 9
A rusting nail: Physical or Chemical change?
Chemical Change
What type of reaction is this?
copper + silver nitrate ----> silver + copper nitrate
Single Displacement
What is the Law of Conservation of Mass?
This law states that matter cannot be created or destroyed in a chemical reaction.
What is meant by the term “equilibrium” in chemical reactions?
The speed/velocity at which a forward and reverse reaction takes place in one reaction is the same.
Oxygen is an example of cation or anion?
Anion
The number of electron shells that Nitrogen has?
2 electron shells
Write the chemical formula for carbon tetrachloride
CCl4
What is the excess reactant?
This term decribes the substance that remains when the limiting reactant is completely consumed in a reaction.
What is an exothermic reaction?
A reaction where heat is released from the reaction
LiF. Why is it an ionic compound?
Because it has a metal and a nonmetal being bonded
The group number of Alkali metals?
Group 1
What does WHMIS stand for
Workplace Hazadous Materials Information System
In this type of bond, electrons are shared equally between two nonmetals, resulting in no charge separation.
Non-Polar covalent bond
If you increase the temperature of a reaction, the rate of reaction…
Would increase
One mole of any substance contains this many particles.
6.02 × 10²³ (Avogadro’s number)
Where are neutrons and electrons found in an atom?
Nucleus
Name the diatomic elements (Hint: 6 elements)
Hydrogen, Oxygen, Fluorine, Bromine, Iodine, Chlorine
This type of radiation is made up of helium nuclei and is the least penetrating, being stopped by a sheet of paper.
Alpha radiation
What is the definition of the term “enthalpy”?
The total energy of a "system" at constant pressure
This element has the highest electronegativity.
Fluorine
Salsa is an example of heterogeneous or homogeneous mixture?
Heterogeneous
What’s a valence electron?
The electrons found in the outermost shell
Define solubility
This term refers to the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature.
Differentiate the terms “oxidation” and “reduction” of a species (element/atom) in chemistry
Oxidation means an atom (Cl) losing electrons, thus increasing oxidation number. Reduction means an atom (Cl) gaining electrons, thus decreasing oxidation number, and it has to do with the oxidation number of the species.
This periodic trend refers to an atom's ability to attract electrons.
Electronegativity