Lab safety
Significant figures and notation
Mass and periodic table
Ionic compounds
Covalent compounds
100
We should wear glasses.
How we protect our eyes during experiment?
100
5.4*10-8
0.0000054
100
9.4 g/cm3
To measure the density of the bottle. The volume of the bottle is 5.3cm3. And the mass of the bottle is 50g.
100
Cation is a positively charged ion. Anion is a negatively charged ion.
What different between cation and anion?
100
Ionic compound :the chemical bond take the valence electrons. Covalent compound :the chemical bond share the electrons.
What the different between covalent bond and ionic compounds?
200
we should use the fire extinguisher and then tell teacher.
When the lab getting fire, what should we do?
200
5.006787*10-1
0.5006787
200
Group: a series of columns. Period: the rows
What the different between groups and periods?
200
ionic bond :the electrostatic force that holds oppositely charged particles together in an ionic compound. ionic compounds :compounds that contain ionic bonds.
What different between ionic bond and ionic compounds?
300
Following chemical laws.
How could we make sure to use the chemical stuff in safe?
300
2
How many significant notation does 0.0034 has?
300
4( s,p,d,f)
How many energy sublevels do the periodic table divide?
300
Polyatomic
Clo4- is ________ ion.
300
They can represent the arrangement of atoms.
What is Lewis structure?
400
Do not fright or play in the lab.
How to protect ourselves in lab?
400
3
How many significant notation does0.103 has
400
5
How many valence electrons does group 15 has?
400
Melting and boiling points Malleability, ductility, and durability Thermal conductivity and electrical conductivity Hardness and strength
Exampling the properties of metals.
400
Endothermic reaction:occurs when a greater amount of energy is required to break the existing bonds in the reaction than is released when the new bonds from in the products. Exothermic reaction: occurs when more energy is released during product bond formation than is required to break bounds in the reaction.
What the different between endothermic reaction and ectothermic reaction?
500
2
How many significant notation does 0.00045 has?
500
Indicates the relative ability of its atoms to attract electrons in a chemical bond.
What is electronegative?
500
Substitutional alloys: some of the atoms in the original metallic solid are replaced by other metals of similar atomic size. Interstitial alloys:is formed when the small holes in a metallic crystal are filled with smaller atoms.
What is the different between substitutional alloys and interstitial alloys?
500
It is a condition that occurs when more than one valid Lewis structure can be written for a molecule or ion.
What is resonance?
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