A sample contains 27.1 g of calcium oxide. How many moles of calcium oxide are in the sample?
What is .483 mol CaO
100
Define Absolute Zero
What is The coldest temperature, 0 Kelvin, that can be reached.
100
A 0.750 L aqueous solution contains 90.0 g of ethanol, C2H5OH. Calculate the molar concentration of the solution in mol·L-1.
What is [C2H5OH ] = 2.60M
100
On the PH scale is a acid lower or higher than 7
What is lower than 7
200
What does RFM stand for?
What is relative formula mass
200
How many atoms are in 0.652 mol of iron?
What is 3.93X10^23 atoms Fe
200
Define Pressure
What is the force applied to a unit area of surface
200
What mass of NaCl are dissolved in 152 mL of a solution if the concentration of the solution is 0.364 M?
What is 3.24 g
200
Does a base have a bitter or sweet taste
What is bitter
300
The equation which converts mass into moles is
What is moles = mass ÷ RFM.
300
How many liters does 3.8 moles of O2 occupy at STP (standard temperature and pressure)?
What is 85.12 O2
300
Define Pascal
What is a unit of pressure equal to one newton per square meter
300
A property of an acid
What is Corrosive ('burns' your skin)
400
Calculate the molar mass of CuSO4.
What is 159.5 g/mol
400
How many moles of nitrogen ar?e there in a 7.45 mol sample of ammonium phosphate?
What is 22.4 mol N
400
What is the kinetic molecular theory
What is based on the idea that particles of matter are always in motion
400
What mass of dextrose, C6H12O6 is dissolved in 325 mL of 0.258 M solution?
What is 15.1 g
400
An example of an acid
What is
Hydrochloric acid (HCl) in gastric juice
Sulphuric acid (H2SO4)
Nitric acid (HNO3)
Carbonic acid in soft drink (H2CO3)
Uric acid in urine
Ascorbic acid (Vitamin C) in fruit
Citric acid in oranges and lemons
Acetic acid in vinegar
Tannic acid (in tea and wine)
Tartaric acid (in grapes)
500
Calculate the molar mass of CaCOH.
What is 69.09 g/mol
500
9. 90.0 g of FeCl3 reacts with 52.0 g of H2S. What is the limiting reactant? What mass of excess reactant remains after the reaction?
What is FeCl3 is limiting agent, 23.6 g H2S excess
500
Define Ideal Gas
What is a hypothetical gas with molecules of negligible size that exert no intermolecular forces
500
A mass of 98 g of sulfuric acid, H2SO4, is dissolved in water to prepare a 0.500 M solution. What is the volume of the solution?
What is 2.00 L
500
Properties of a base
What is
Corrosive ('burns' your skin)
Soapy feel
Has a pH more than 7
Turns red litmus paper to a blue colour
Many alkalis (soluble bases) contain hydroxyl ions (OH–)
Reacts with acids to form salt and water