Changes in Matter
What are PHYSICAL properties?
Characteristics that can be sensed or measured without changing the composition of matter.
What is a pure substance?
Matter that only has one type of atom or molecule.
(Elements & Compounds)
What is an atom?
The smallest particle of an element.
Neutral, equal number of protons and electrons.
Where are the non-metals found on the periodic table?
Upper right corner above the staircase.
What are the two types of chemical compounds?
Ionic and molecular
What are the two different types of physical characteristics?
Qualitative & Quantitative
What are the two types of mixtures?
Homogenous & Hetergenous
What is an ion? What are the two types of ions?
A charged atom. (unequal number of protons and electrons)
Anions & Cations
Where are the metalloids on the periodic table?
Along the staircase on the right side.
How do I name ionic compounds?
Metal first, non-metal 2nd with "-ide" ending.
Water boiling is what type of change?
Physical (change in state)
Name THREE pure substances.
Any element or compound.
H2O, O2, NaCl... etc
What are the three types of subatomic particles and what are their charges?
Protons > positive
Electrons > negative
Neutrons > neutral
What do the group number and period number represent about an atom?
Group number > # of valence electrons
Period number > # of shells
What is the name of this compound?
P4S5
Tetraphosphorus pentasulfide
Name at least FIVE physical properties.
Ductility, malleability, colour, lustre, hardness, odour, mass, density, solubility, boiling point, etc.
Name THREE homogenous mixtures.
Sugar dissolved in water, chocolate milk, tea, coffee, etc.
What charge would a calcium ion have? What type of ion does it become?
2+, cation
Where on the periodic table would I find atoms with the largest atomic radius?
Bottom left corner
What is the name and chemical formula of the compound that forms between calcium and chlorine
Calcium chloride, CaCl2
What are some clues that a chemical change occurred/is happening?
Formation of bubbles
Change in colour
Change in energy (temperature, light)
Formation of a precipitate
Name THREE heterogeneous mixtures.
Pizza, chicken noodle soup, sand
Where are the different subatomic particles in an atom found?
Protons & Neutrons > nucleus
Electrons > energy shells/orbitals
What are the periodic reactivity trends of metals?
Down a group > more reactive
Across a period > less reactive
Show the bonding between beryllium and chloride.
What is the chemical formula? chemical name?
BeCl2
Beryllium chloride