Chemical Reaction or Not
A metal cube is heated up and expands, but does not melt.
No!
CH4 + O2 -> CO2 + H2O
H2O
Water/Water vapor
CO2 is commonly made from reactants...
C + O2
Name the subatomic particles that orbit an atom's nucleus
Electrons
Yes. This is a short way to express the way iron oxide, or rust is made, being 4Fe + 3O2.
H2 + O2 > H2O
Invalid. Missing oxygen.
CO2
Carbon Dioxide
2H2O is most commonly from reactants...
2H2 + O2
The planetary model of an atom was made by...
Two metals are melted, and then placed and mixed together in the same vat. When its cooled down, it creates an alloy. Is this a chemical reaction?
No. This is a mixture!
2Mg + O2 -> 2MgO
Valid.
C6H12O6
Glucose/sugar
With light, C6H12O6 + 6O2 is most commonly made with reactants...
6CO2 + 6H2O
Name all three main types of bonding
Covalent, ionic, and metallic
When you cut an apple in two, it begins to turn brown. While safe to eat, it alters the taste and texture.
Yes! Cutting it creates damaged cell walls, which exposes an enzyme called polyphenol oxidase. When this enzyme reacts with oxygen, it creates melanin, which creates said brown pigment. This is a form of aerobic oxidation called enzymatic browning.
C2H6 + O2 -> CO2 + H2O
Invalid.
C8H18
Octane
6CO2 + 6H2O is commonly made from these reactants...
C6H12O6 + 6O2
2H2 and O2 -> 2H2O + Energy. Name this process
In an uncontrolled space in a pond of water, a stray neutron collides with U-235. This causes it to split into Ba-144 and Kr-89. This suddenly causes the pond of water to shrink in height, as hydrogen and oxygen gases rise out of the water. Explain.
No. This is a concept known as nuclear fission, which acts on a subatomic level rather than the molecular level in which chemical reactions work in. The hydrogen and oxygen gases were formed because of a process called radiolysis, in which when the water collides with the radiation from the U-235, it splits into hydroxyl radicals and hydrogen atoms.
Valid.
DOUBLE WILDCARD! 1500 points on the line...
C9H8O4
You may pass on this question and pass it to the next team, who can either skip and pass to the next team or answer. If all teams pass, this question deducts 750 from every team. You may use a calcuator.
Asprin/acetylsalicylic acid
16CO2 + 18H2O is commonly made from...
Reaction Name: Combustion of Octane
2C8H18 + 25O2
DOUBLE WILDCARD! 1500 Points
Assume a gas of O2 has a pressure of 1.21 atm and 307 degrees Kelvin. What volume of this gas is required to burn 4.00 moles of octane, or C8H18, to produce 16CO2 and 18H2O? Assume a unbalanced equation to be 2C8H18 + (?)O2 -> 16CO2 18H2O to burn 2.00 moles of octane. Moles are also known as the coefficients. Balance the equation to get the amount of moles of O2 to burn 2.00 moles of octane, then find the amount of moles required to burn 4.00 moles of octane.
Using the amount of moles required, you may calculate the volume using the ideal gas law of PV = nRT and rearranging it to find V, or volume.
Assume R as the universal gas constant, 0.08206 L atm mol K, T as temperature Kelvin, n as amount of moles, and P as pressure. Round the number to 3 decimal places.
You may pass on this question and pass it to the next team, who can either skip and pass to the next team or answer. If all teams pass, this question deducts 750 from every team. You may use a calcuator.
You would need a volume of 1041.009L O2 gas to burn 4.00 moles of octane.