MODULE Flashcards
To separate ink dye you would use
chromatography
which piece of laboratory equipment would be the best to use to measure heat of reaction?
calorimeter
what is the molar mass of magnesium nitrate?
148.3 g/mole
what is the name of N2O5?
dinitrogen pentoxide
What is the volume of N2 at STP contains 3.0 x 10^21 molecules?
0.112 L
How many total ions are in 1.00 mole of Chromium (III) sulfate Cr2(SO4)3?
5 moles
What is the IUPAC name for PbO2?
Lead (IV) oxide
Which instrument is used to accurately measure the volume?
1. Pipette
2. Buret
3. Graduate Cylinder
4. Beaker
5. Erienmeyer flask
2 and 3
The product of 0.010 m x 0.0942 m would be written as
0.00094 m^2
Which is a homogeneous mixture?
salt water
What is the average atomic mass for an element with the abundance of isotopes shown?
Atomic mass, amu and percent abundances, %
62.93, 69.2
64.93, 30.8
63.5 amu
Which statement best describes the effect of raising temperature on the rate of a reaction?
it will increase because the molecules have a greater average kinetic energy.
Which gas molecules have the greatest average speed at STP?
NH3
Which process represent a physical change?
The condensation of steam
To increase the solubility of gases in liquids, one could
increase the pressure
which is the coefficient of oxygen in this equation when it is correctly balanced?
7
What is the volume of 18.99 g of fluorine, at the pressure of 1.00 atm and a temperature of 27 celsius?
12.30
How many hydrogen atoms are in 5.0 moles of hydrogen molecules?
6.02 x 10^24 atoms
The greenhouse effect is caused by
All of the above
(CH4, CO2, Chloroflourocarbons (CFC5)
If the molecular formula is C6H8O6, what is the empirical formula?
C3H4O3
A student determined the percentage of water in hydrated copper (II) sulfate. The results of three trials are 32.42%, 32.41%, 32.39%. The actual percentage of water is 26.08%. The results the students obtained were
precise but not accurate
How many total atoms are in 1.00 mole of calcium sulfate dehydrate CaSO4 2H2O?
12 moles
What is the sum of 3.36 m, 7.1 m and 2.358 m?
12.8 m
One liter of gas has a mass of 7.78 g at STP. What is the molar mass of this gas?
174.27 g
Which of the following is true for all the chemical reactions?
The total mass of products is equal to the total mass of reactants.