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Bonding
Reaction Rates
Amounts
Solutions
Other Stuff
100
In an ionic bond, cations are attracted to
What is anions
100
The energy required to start a chemical reaction
What is ACTIVATION ENERGY
100
How many moles of CH4 are contained in 96.0 grams of CH4?
What is 6
100
A teaspoon of dry coffee crystals dissolves when mixed in a cup of hot water. This process produces a coffee solution. The original crystals are classified as this.
What is A SOLUTE
100
The random molecular motion of a substance is greatest when the substance is
What is A GAS
200
The number of valence electrons in a calcium atom
What is TWO
200
This decreases the activation energy required by a chemical reaction
What is A CATALYST
200
How many atoms are in a chromium sample with a mass of 13 grams?
What is 1.5 x 10^23
200
If the attractive forces among solid particles are less than the attractive forces between the solid and a liquid when they are put together, this will happen.
What is DISSOLVING
200
Of the three following processes, which one is exothermic? FREEZING MELTING EVAPORATING
What is FREEZING
300
The number of valence electrons for each atom in a compound must be this many to be stable.
What is EIGHT
300
Heating a reaction always has this effect on its rate.
What is INCREASE
300
How many moles of chlorine gas are contained in 9.02×10^23 molecules?
What is 1.5
300
If the solubility of NaCl at 25oC is 36.2 g/100 g H2O, what mass of NaCl can be dissolved in 50.0 g of H2O?
What is 18.1 g
300
The specific heat of copper is about 0.4 joules/ gram oC. How much heat is needed to change the temperature of a 30-gram sample of copper from 20.0 oC to 60.0 oC?
What is 480 J
400
Draw the Lewis electron dot structure for carbon dioxide, CO2.
What is ..C.. - - O - - ..C..
400
Increasing the concentrations of reactants has this effect on reaction rate.
What is INCREASE
400
Under what conditions will a 0.50 mole sample of helium occupy a volume of 11.2 liters?
What is STP
400
How many moles of HNO3 are needed to prepare 5.0 liters of a 2.0 M solution of HNO3?
What is 10 mol
400
Equal volumes of 1 molar hydrochloric acid (HCl) and 1 molar sodium hydroxide base (NaOH) are mixed. After mixing, the solution will be
What is NEUTRAL
500
The force of attraction between cations and anions is of this type.
What is ELECTROSTATIC
500
Hydrogen peroxide, H2O2, breaks down into H2O and O2 over time. MnO2 , manganese dioxide, can be used to lower the energy of activation needed for this reaction to take place and, thus, increase the rate of reaction. What type of substance is MnO2?
What is A CATALYST
500
A mass of 5.4 grams of aluminum (Al) reacts with an excess of copper (II) chloride (CuCl2 ) in solution, as shown below. 3 CuCl2 + 2 Al2 AlCl3 + 3 Cu What mass of solid copper (Cu) is produced?
What is 19 grams
500
The Dead Sea is the saltiest sea in the world. It contains 332 grams of salt per 1000 grams of water. What is the concentration in parts per million (ppm)?
What is 332,000 ppm
500
The volume of 400 mL of chlorine gas at 400 mm Hg is decreased to 200 mL at constant temperature. What is the new gas pressure?
What is 800 mmHg