Chemical Reactions
Signs of a chemical reaction include...
What is a change in color, evolution of gas (odor), formation of a precipitate, change in temperature, formation of a flame, or light being given off?
The number of moles are in 5.5 grams of CuO.
What is 0.069 mol?
The amount of atoms that 23.39 grams of Lithium have.
What is 2.03x1024 atoms?
The empirical formula of a compound that contains 7.31 g Ni and 20.0 g Br.
What is NiBr2?
On this day we celebrate the holiday Halloween.
What is October 31st
The type of chemical reation for the following equation.
H2CO3 → H2O + CO2
What is decomposition
The number of grams does 2.45 moles of Lithium weighs.
What is 17.0 mol Li?
The amount of molecules that 5.03 grams of MgCl2 has.
What is 3.18x1022 molecules of MgCl2?
The percent composition iron in Fe2S3.
What is 53.73% of iron in Fe2S3?
This 1978 iconic horror film directed by John Carpenter helped popularize the modern slasher genre set on Halloween night.
What is Halloween?
To balance this chemical reaction, this coefficient belongs in the blank:
____Mg + N₂ → Mg₃N₂
What is 3?
The amount of moles of Carbon are in 4.15 x 1012 atoms of Carbon.
What is 6.89x10-12?
A person has about 0.125 Liters of CO2 in their lungs before they exhale. Under ideal conditions 1 mol of any gas = 22.4 Liters of any gas. How many molecules of CO2 will that person breathe out on average?
What is 3.36 molecules of CO2?
A compound is broken down into its constituent elements and is found to contain 177.40 g Fe and 65.60 g P. What is the empirical formula of this compound?
What is Fe3P2?
Before pumpkins became the traditional canvas for jack-o'-lanterns in North America, this root vegetable was commonly carved in Ireland and Scotland.
What are turnips?
To balance this chemical reaction, these coefficients belongs in the blanks:
____N₂ + ____O₂ → ____N₂O₅
What is 2, 5, 2?
The amount of molecules that are in 0.655 moles of C6H14.
What is 3.94x1024molecules?
The amount of liters that are in 444 grams of SF6.
What is 68.1 L?
The percent composition of each element in Cu3(PO4)2.
What is 50.09% of Cu, 16.27% of P, and 33.63% of O?
The primary purpose of cempasúchil (marigolds) on a Día de los Muertos altar.
What is the vibrant color and strong scent guide the souls of the deceased back home?
To balance this chemical reaction, this coefficient belongs in the blank:
____ Pb(NO3)2 + 2 NaBr → PbBr2 + 2 NaNO3
What is 1?
The amount of Liters in 5 moles of H2O.
What is 112 L?
A patient in the intensive care unit is prescribed a intravenous dose containing 0.450g of glucose (C6H12O6) to treat acute hypoglycemia.
To evaluate cellular transport efficiency, a bio-medical researcher needs to know the exact number of individual glucose molecules administered in this dose.
Question: How many glucose molecules are present in this 0.450g dose?
What is 1.50x1021 molecules?
The empirical formula of a compound that is 34.24% Cu, 1.09% H, 12.94% C and 51.73% O.
What is CuH2C2O6?
Halloween traces its roots back to the ancient Celtic festival of Samhain. This is the seasonal transition that Samhain marks for the Celts.
What is the end of the harvest and the beginning of the dark, cold winter?