Quaker explosions
Balancing equations
Enthalpy and rocket fuel
pH and mining waste
Moles moles moles
100
This is what "molarity" means.
What is moles per liter?
100
Balance this equation.
Nb + F --> NbF5
What is
Nb + 5F --> NbF5
100
This is the name for a reaction that releases energy overall.
What is an exothermic reaction?
100
An acid has a pH of this.
What is less than 7?
100
How many grams are there in 1 mole of Helium?
What is 4.00 g?
200
This is one of the principles of green chemistry and what it means.
Answers will vary.
200
This is the balanced equation for combustion of Hydrogen gas.
What is H2 + 2O2 --> 2H2O ?
200
This is an example of an endothermic process.
Anything that absorbs heat: An automatic ice pack, melting ice into water, boiling water into steam, cooking or baking food, etc.
200
If you have something with a pH of 2 and dilute it 100 times with water, this will be its final pH.
What is 4?
200
How many liters does 1 mole of a gas occupy at standard temperature and pressure (STP)?
What is 22.4 liters?
300
This is an explosion in which particles move faster than the speed of sound.
What is detonation? (Deflagration is when it is less than the speed of sound!)
300
This is the balanced chemical equation for neutralizing hydrochloric acid (HCl) with lye (NaOH).
What is
HCl + NaOH --> NaCl + H2O ?
300
A chemical reaction releases 543 kJ of energy. What is the sign of ΔE? Is the reaction endothermic or exothermic?
ΔE is negative. Reaction is exothermic.
300
These are two ways of dealing with toxic acid waste.
What are dilution and neutralization?
300
How many moles are there in 2 L of 0.75 M solution?
What is 1.5 moles?
400
Explosions with more energy tend to have a higher level of this.
What is brisance?
400
Fill in the blank:
S + 2H2SO4 --> __ SO2 + 2 H2O
What is
Fill in the blank:
S + 2H2SO4 --> _3_ SO2 + 2 H2O
400
These are two reasons why Hydrogen-fueled cars are so uncommon.
Answers will vary. Includes lack of infrastructure, dfficulty making the Hydrogen fuel in a way that is green/without fossil fuels, lack of efficiency in the process of making Hydrogen fuel compared with other fuel/electricity types, difficulty storing and transporting Hydrogen as a lightweight gas
400
If you had a substance with a pH of 14 and diluted it 1,000,000 times, what would its new pH be?
What is pH of 8?
400
How many moles of water are there in 36.04 grams of water?
What are 2 moles?
500
Write three groups from the Periodic Table, where they are located, and how many valence electrons they have.
Alkali metals - first column - 1
Alkaline earth metals - second column - 2
Transition metals - whole middle part - 2 (mostly)
Metalloids - zigzag - different each one
Halogens - second to last column - 7
Noble gasses - last column - 8
500
Combustion of ethane (C2H6) releases 1560 kJ/mol. Write the balanced equation for this combustion, including heat released.
What is
2C2H6 + 5O2 --> 6H2O + 2CO2 + 3120 kJ ?
500
This is a drawing of each of the four stages of a four-stroke cycle.
500
This is the balanced neutralization reaction for combining nitric acid (HNO3) with calcium hydroxide (Ca(OH)2).
What is
2HNO3 + Ca(OH)2 --> 2H2O + Ca(NO3)2 ?
500
If one mole of methane (CH4) is combusted, how many grams of oxygen are burned?
CH4 + 2O2 --> CO2 + 2H2O
1 mole CH4 means 2 moles of O2 are burned. 1 mole of O2 is 32.00 g, so 32 * 2 = 64 grams of oxygen burned.