Periods and Groups
Where can you find atomic mass on the periodic table?
Underneath the symbol.
Proton
Lustre, Viscosity, Clairty, Hardness/Brittleness, Solubility
What is a valance shell?
The outermost orbit of an atom.
What are the two types of mixtures?
Heterogeneous/Mechanical and Homogenous
Name a liquid element.
Elements which are coloured in blue , i.e: Hg, Br
What is a negatively charged atom?
Multiple Choice. Your team gets one final answer
A physical change is...
a) A change in which a type of matter remains the same, but a change in phase or form may occur
b) When bonds are broken
c) A change in which a type of matter changes into one or more new substances
a) A change in which a type of matter remains the same, but a change in phase or form may occur
Electron(s) on the outermost shell of the atom.
What is a pure substance?
Matter which contains only one kind of particle.
Periods run __________. Groups run __________.
horizontally, and vertically.
Every atom has a ______ (positive, negative, neutral) charge.
Every atom has a neutral charge. This is because equally charged forces from protons and electrons cancel out.
What numerical rule is followed when drawing Bohr Rutherford Diagrams?
2-8-8-2
Identify the compound:
Oxygen, Water, Salad, Lead
Water (H2O)
What is the least reactive group?
Noble Gases.
True or False,
protons are located in the nucleus
electrons are located in the nucleus
neutrons are located in the outer orbits
False, electrons are located in the outer orbit.
More multiple choice -.-
Select which option is an example of chemical change.
a) You weren't careful putting away groceries, and drop a carton of eggs which results in them all breaking...
b) You start a potted boil of water and as you place a clear lid on, gas gets trapped, resulting in water droplets on the inside of the lid.
c) You bleach your hair.
c) You bleach your hair.
Recall: A chemical reaction occurs when change in which a type of matter changes into one or more new substances. Old chemical bonds are broken and new ones are formed.
Bleach is an acid (homogenous) solution. Chemicals in the hair bleach react with chemical bonds in your hair which give it it's original pigment and break them, forming new ones which result in an unexpected colour change.
Compounds are held together by _________ _____! They can only be broken down by _________ __________
Compounds are held together by chemical bonds! They can only be broken down by chemical reactions.
Elements in each period have the
same number of _____.
Elements in the same group have
the same number of _________ ________________.
shells, outer electrons
Math break! How many atoms of oxygen (O) are in...
2Li(NO3)2
12
State the five clues of chemical change.
New Colour Appears (unexpected colour change)
Heat or light is given off (energy change)
Bubbles of gas form
A precipitate (solid) forms in a liquid
New odor is released (ex; rotting)
True or False: Bohr Rutherford Diagrams can be drawn for every element on the periodic table.
False, they can only be drawn for the first twenty.
True or False? Elements are often chemically broken down in scientific labs.
False,
Elements are the purest forms of particles. Meaning that they cannot be broken down further by ordinary means
(such as simple reactions, heat, or electricity)