chemistry ch 7
Avogadro's number is the number of ________.
particles in 1 mole of a substance
A chemical equation is balanced when ________.
the number of atoms of each element is the same in reactants and products
3.00 moles of NO2 have a mass of ________.
138 g
What is the molar mass of copper(II) sulfate, CuSO4?
159.6 g/mole
Which of the following gives the balanced equation for this reaction? K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3
2 K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + 6KNO3
Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3produced? 4Fe + 3O2 → 2Fe2O3
2 moles Fe2O3 / 3 moles O2
0.400 mole of sucrose, C12H22O11, contains ________ C atoms.
2.89 X 10^24
One mole of neon atoms has a mass of ________.
20.18 g
The molar mass of potassium is ________.
39.10 g/mole
When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl2, how many moles of aluminum chloride are produced? 2Al + 3Cl2 → 2AlCl3
4 moles
How many moles of water, H2O, are present in 75.0 g H2O?
4.16 moles
One mole of particles of any substance contains how many particles?
6.02 × 1023 particles
How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?
640. g
The ________ is the minimum energy needed for a chemical reaction to begin.
activation energy
2Mg + O2 → 2MgO The number of moles of oxygen gas needed to react with 4.0 moles of Mg is ________.
1.00 mole
For the following reaction, what is the correct coefficient for the H2? Fe + HCl → FeCl3 + H2
1
The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction. 2H2O ----> (electricity) 2H2 + O2
decomposition
The following reaction is an example of a ________ reaction. C5H8 + 7O2 → 5CO2 + 4H2O
double replacement
A reaction that releases energy as it occurs is classified as a(n) ________.
exothermic reaction
In an oxidation-reduction reaction, the substance oxidized always ________.
gains electrons