Cards in this guide (18)
What is a molecular formula
The molecular formula specifies the actual number of atoms of each element in a molecule.
Calculate the number of atoms of O contained in 16.0 pounds of O
16.0 lbs = 7,257 g of O2
Oxygen exists in the gas form as 02
7,257g O2 * 1 mol O2/ 32 g * 2 mol O / 1 mol O2 * 6.022x10^23
atoms/mol
= 2.73E26 atoms of O
What is the general form of a synthesis reaction
What information does a solubility table give
it tells which compounds will dissolve in water
What is the mass percent composition of an element in a molecule
Percentage composition= (mass of the element/mass of the
molecule)*100
The fraction of the molecule's mass that comes from the
element's mass
What kind of information does the activity series of metals give us
It compares how reactive the metals are
It predicts if one metal will replace another metal in a
compound
How do scientists write very large numbers
they express the numbers using scientific notation
Why is it useful to express a number in scientific notation
It can shorten the expression into a number that can more easily
be understood by giving an order of magnitude to the number. For
example, would you write 0.00000000000000000045 or would you write
4.5 X10-19.
What is the net ionic equation for the reaction 2kohaq h2so4aq 2h2ol k2so4aq
OH- 2H+ -> 2H2O(I)
ywwww
:)
If the products of a reaction are NaCl and H2O what does the law of conservation of mass reveal about the reactants in the reaction
The reactants will have one Na, one Cl, one O, and two H atoms
In which step of the four stroke engine cycle does the heat from the combustion reaction cause the pistons to move
Hydrogen-powered cars create less pollution than gasoline-powered cars when driven. What might be a challenge to using hydrogen as a fuel
Challenges to hydrogen as fuel include no distribution network,
ie gas stations, and fear that the car co u l d explode like the
Hindenburg.
Is not a concern regarding the use of corn as a biofuel
The color of corn is different than the color of gasoline or coal
APEX
How would 0.000000728 be written in scientific notation
It is 7.28*10^-7 in scientific notation
In the reaction 2Li(s)+2H2O(l) ➝ 2LiOH(aq)+H2(g), which compound is in the gaseous state
How is the mass of 1 mole of an element determined
It is the same as the element’s atomic mass, but in grams.
Finish balancing the following equation:__Al(s)+3Zn(NO 3 )2(aq) ➝ Al(NO 3)3(aq)+__Zn(s) What coefficient does Al(s) have in the balanced equation