Grab Bag
10-letter word that describes a testable prediction in the scientific method
Hypothesis
Give the charges of each: proton, neutron and electron
+, neutral, -
What is the first step when balancing a chemical equation?
A) Calculate densities
B) Check the number of atoms on both sides
C) Randomly assign numbers
D) Cry for two hours
B) Check the number of atoms on both sides
What is the molar mass of sodium bicarbonate (NaHCO3)
84 g/mole
The only noble gas that fits this category
argon (Ar)
This quantity is calculated by dividing the mass of a substance by its volume
Density
The protons and neutrons make up this part of the atom
Nucleus
C (s) + O2 (g) ---> CO2 (g)
C (s) + O2 (g) ---> CO2 (g)
Already balanced
How many grams are there in 2.0 moles of N2O5 ?
216 g
An early “science” concerned with turning common elements and compounds into gold
Alchemy
What are the units for the molar mass of an element or compound?
grams/mole or amu
This is the number of protons in the following isotope: Si-28
14
How many atoms are there of each element?
Ca(MnO3)2
1 Ca, 2 Mn, 6 O
How moles are there in 6.0 grams of water (hint: this will be a decimal)
0.33 moles
Commonly found on the periodic table, this term refers to 10 in neon, 3 in lithium and 17 in chlorine
atomic number
S2Cl5
(Give the name)
Disulfur pentachloride
The number of neutrons in the following isotope:
Nitrogen-13
6
Balance the following equation:
__CaSO4 + __KOH --> __Ca(OH)2 + __K2SO4
1 CaSO4 + 2 KOH --> 1 Ca(OH)2 + 1 K2SO4
How many hydrogen atoms are in one molecule of the following:
CH3CH2(COOH)2OH
8
6.02 x 10^23
Avogadro's number
Determine the formulas for the following (which one doesn’t exist?):
1) Nitrogen trihydride
2) Selenium tetrabromide
3) Dihelium mononitride
4) Diboron trioxide
NH3
SeBr4
He2N (DNE)
B2O3
The number of electrons in the following ion
Fluorine with a 1- charge
10
Balance and identify the type of reaction:
C3H6 + O2 ---> H2O + CO2
2 C3H6 + 9 O2 ---> 6 H2O + 6 CO2
Combustion
If I have 10 g of AgCl2, how many grams of silver could I extract from it (percent composition question)
Approx 6 g
Element symbol that inspired the name of a country originally colonized by the Spanish (the full name of the element does NOT start with an A)
Ag (Argentum, in Latin)