Unit 1A
What do you use in the lab to grab small objects that can be harmful?
Forceps
What does the prefix “centi” mean?
1/100 of a unit
Where are the noble gases on the PTE?
On the far right
What element do all acids have?
Hydrogen
What is Avogadro’s number?
6.022 x 1023
What is material made up of 2 or more elements?
Mixture
How do you find density?
Mass/Volume
What does the atomic number of an element tell you?
How many protons it contains
What ion has a positive charge?
Cation
How do you get from moles to particles?
You multiply by avogardro‘s number
What are the two types of mixtures?
Homogenous and Heterogeneous
How many significant figures are in the number 001030?
3
What is the order of electron sublevels?
S, P, D, F
What are the bond angles of a molecule with linear geometry?
180
How many molecules are in 1.13 mole of SO3?
6.81 x 1023
What is a heterogeneous mixture which contains tiny particles which never settle out?
Colloid
What is the standard unit for length?
Meter
Which scientist did the Gold-Foil experiment?
Rutherford
What is the formula for lead(IV) sulfide?
PbS2
What is the molar mass of H2O?
18.01g
What is a characteristic of a substance that can be observed without changing the substance into another substance?
Physical Property
Answer the equation using sig figs
2.80 x 10000
30000
How did Mendeleev organize the PTE?
He organized it by atomic mass
What is the name of the compound N2S3?
Dinitrogen Trisulfide
How many moles are in 4.65 x 1024 moles of NH3?
7.72
Odor change is evidence of what type of change?
Chemical Change
What mph is 30 m/s?
67.11 mph
What happens to electronegativity as you move across the PTE?
It increases
What are the bond angles of a tetrahedral?
109.5
Find the percent compostition for Na in NaCl?
39.3%
Muddy pond water is a…
Suspension
What are the 3 meniscus types?
Concave, Convex, and Flat
What does Hund’s law say?
Every orbital within a sub level must be filled before adding another electron
What is the molecular geometry of BF3?
Trigonal Planar
Fill in the blank to balance the equation
_CH4 + _02 yields _CO2 + _H2O
1,2,1,2