Changing ones hair color from brown to blonde is an example of this
What is a chemical change?
100
This element has an isotope that has the atomic number 11 proton number 11 and the mass number is 20
What is 20/11 Na?
100
6.022 x 10^23
What is Avagadro's number?
100
A proton acceptor
What is a Bronsted base?
100
0 C and 1 atm
What is STP?
200
Solid water changing to liquid water
What is a physical change?
200
The emperical formula for acetylene C2H2
What is CH?
200
The amount of H atoms present in 25.6 g of urea [(NH2)2CO]. The molar mass of urea is 60.06g.
What is 1.03 x 10 ^24 H atoms
200
acid + base --> salt + water
What is neutralization reaction?
200
The ideal gas law equation
What is PV=nRT?
300
The density of mercury , the only metal that is a liquid at room temperature is 13.6 g/mL. This is the calculated mass of 5.50 mL of the liquid.
What is 74.8 g?
300
The formula for magnesium nitride (Mg 2+ and N3-)
What is Mg3N2?
300
The percent composition by mass of H, P, and O in phosphoric acid.
What is H = 3.086%, P = 31.61%, and O = 65.31%?
300
A reaction in which two or more substances combine to form a single product
What is combination reaction?
300
The final volume of a balloon that was inflated with helium at a volume of 0.55 L at 1 atm and then rose to a 0.40 atm with a constant temperature.
What is 1.4 L?
400
Solder is an alloy made of tin and lead that is used in electronic circuits. A certain solder has a melting point of 224 C. This is the calculated melting point in F.
What is 435 F?
400
The chemical formula for the compound calcium phospate?
What is Ca3(PO4)2?
400
The mass of CO2 produced when 856 g of C6H12O6 is consumed by a person over a certain period.
Equation
C6H12O6 + 6O2 --> 6 CO2 + 6 H2O
What is 1.25 ^3 g CO2?
400
a reaction in which a substance reacts with oxygen usually with the release of heat and light to produce a flame.
What is a combustion reaction?
400
The density of carbon dioxide (CO2) in grams per liter at 0.990 atm and 55 C
What is 1.62 g/L?
500
Helium has the lowest boiling point of all the elements at -452F. This is the calculated temperature in C.
What is -269C
500
SiCl4 is the molecular compound
What is silicon tetrachloride?
500
The amount of Li needed to produce 9.89 g of H2.
Equation
2 Li (s) + 2H2O (l) --> 2 LiOH (aq) + H2 (g)
What is 68.1g Li?
500
an ion (or atom) in a compound is replaced by an ion (or atom) of another element
What is displacement reactions?
(Hydrogen, Metal, Halogen)
500
The total pressure of a mixture of gases is just the sum of the pressures that each gas would exert if it were present alone