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The CHARACTERISTIC of an element that can be OBSERVED in a CHEMICAL REACTION
Chemical properties
The PHYSICAL CHARACTERISTICS  of an element that can be OBSERVED with OUR SENSES .
Physical properties
List 3 of the groups in the periodic table.
Alkali metals, alkaline earth metals, halogens, the noble gases...
If an element has 3 electron shells and 2 valence electrons, what group and period does it belong to?
Period 3, group 2
What does the C represent?
Chemical symbol
the electrons in the outermost shell.
Valence electrons
a simple way to draw the electrons of an element.
Shell models
Any matter which has a specific COMPOSITON and specific PROPERTIES
SUBSTANCE
what does THE ATOMIC NUMBER tell us?
HOW MANY PROTONS
How many periods and groups are there in the periodic table?
7 period and 18 groups
The VERTICAL COLUMN periodic table are called
“groups” (sometimes called families).
The horizontal rows in periodic table are called?
PERIOD
What are metalloids (semi-metals)
Metalloids are ELEMENTS that HAVE SOME PROPERTIES OF METALS, and SOME PROPERTIES OF NON-METAL
Which of the following can only be broken down through chemical reactions? A.Elements B.Compounds C.Mixtures
COMPOUNDS
Physical properties of non-metals
• Non-ductile (breaks when stretched) • Transparent as a thin sheets• Not sonorous (does not make sound)
Physical properties of metals
• Ductile (can be stretched into wires) • Opaque (even in thin sheets) • Sonorous (makes sound)
Physical properties of non-metals
• Dull (not shiny) • Insulators (poor conductor of electricity) • Substances with low melting point • Brittle when solid (breaks easily)
Physical properties of metals
Lustrous (shiny) • Good conductor of electricity • Solids with a high melting point • Malleable (can be shaped)
a HYPOTHESIS with A LOT supporting EVIDENCE
A THEORY
A theory is___________________
a hypothesis with a lot supporting evidence
This is the VARIABLE where DATA IS COLLECTED
Dependent variable
These are the VARIABLES that STAY THE SAME during an experiment.
Control variable
This is the ONE VARIABLE that is CHANGED in a fair test.
Independent variable
What is this?
Molecules
What are the five steps to the scientific method?
Observation, hypothesis, prediction, experiment, data
give examples of compound
...
H2O is molecules?
yes, H2O is molecules
O2 is compound or molecules
molecules
TWO OR MORE ELEMENTS that are chemically BONDED TOGETHER
COMPOUNDS
Elements that do NOT FIT into the category of METALS OR NON-METALS.
Metalloids
Elements that share physical properties suchas being DULL,INSULATORS, BRITTLE...
NON-METALS
Elements that share physical properties such as being LUSTROUS,DUCTILE, MALLEABLE...
METALS
TWO OR MORE SUBSTANCES that are combined, but NOT CHEMICAL BONDED
MIXTURES
A GROUP OF ATOMS chemically BONDED TOGETHER.
MOLECULES
All of the known chemical ELEMENTS, ORGANIZED by their CHEMICAL PROPERTIES..
Periodic table
The SMALLEST UNIT OF MATTER, forming a chemical element.
ATOMS
Any substance made of only ONE TYPE OF ATOMS
ELEMENT
Anything that TAKES UP SPACE AND MASS
MATTER
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