Significant Figures
How many Significant Figures are in: 2.789
Just 4
When naming a binary molecule, does the prefix go on the first element or the second one (ex. NF3)
The prefix goes on the 2nd element. In the case of the example, the name would be: Nitrogen Trifluoride. The element with the lower Group number is first in the name
What is the vertical column of the periodic table called?
The Group
What are the designated SI units for Mass?
Kilograms
What is a Cation
A positively charged ion.
Non-zero integers are always_____
significant
What is the Prefix for 6 and 7 we use for naming binary covalent molecules.
6 is Hexa- and 7 is Hepta-
What element on the periodic table has the Elemental symbol W?
Tungsten
Convert 350 micrograms to grams
3.5*10-4 grams
Ionic Compounds consist of charged particles called____.
ions
How many significant figures in: 16 oz in one pound
There are actually no significant figures, why is that?
True or False, We apply binary prefixes to Ionic compounds in the same way we do covalent molecules
False, there are many reasons for this but mostly because Ionic compounds and Covalent are different
Elements are arranged in increasing _____ number on the periodic table
Atomic number. What does atomic number tell us about the element?
I was 27 minutes late to my first class. Convert that time to days
0.01875 days
Metals form____, while non-metals form ____.
Cations, anions
Round 3.74900 to 2 significant figures
It would be 3.7, because we are only looking at the 3.7 and the 4 after it, and since its less than 5 we can just drop that number off.
Name these 2 Binary Covalent Compound: P4O10 and N3H5
Tetraphosphorus decoxide and Trinitrogen pentahydride
What is the Group and Period of the element Se
Group 15 or 5A, period 4. Bonus 100 points if you tell me what type of element it is (nonmetal, semimetal, transition metal, noble gas, halogen, etc)
Density is the ratio of the ____ of an object to the ______?
Mass, volume. We express volume in terms of g/mL or g/cm3 it mostly depends on the professor.
Alkali earth metals lose how many electrons to form ions with the same # of electrons as the nearest noble gases
They lose 2 electrons. (Show periodic table and how it works)
Significant Figures are used for all measurements with respect to their ____and_____?
Accuracy and Precision, can we define both?
What molecules exist in nature in a Diatomic form (meaning they exist connected to another atom of that atom, ex: H2)
N, H, O, F, Br, I, Cl
What is the the only metal on the periodic table that exist as a liquid when at room temperature, also tell me its elemental symbol
Mercury, Hg
This is the SI unit of electric current, named after a French physicist and engineer who contributed to the development of electromagnetism. Its symbol is 'A'.
Ampere
List a polyatomic anion and give me a cation that can pair with it, so that the compound is neutral. (Hint: think about what a polyatomic anion looks like)
Any answer that includes a polyatomic anion and cation that gives an overall neutral charge is cool with me