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WorksheetsChemistry, Ch 10, Chemical Quantities, Pre Assessment
Total questions: 25
Worksheet time: 28mins
Regarding Avogadro’s number and the mole, which of the following statements is TRUE?
There are 12 atoms of carbon in 6.02 x 1023 grams of carbon.
There are 6.02 x 1023 grams of carbon in one mole of carbon
There are 12 atoms of carbon in 1 mole of carbon
There are 6.02 x 1023 atoms of carbon in 12 grams of carbon
Relating moles and particles, which of the following statements is most TRUE?
1 mole of chlorine has more particles than 1 mole of oxygen
1 mole of chlorine has fewer particles than 1 mole of oxygen
1 mole of chlorine has the same number of particles as 1 mole of oxygen
There is no direct relationship between moles and number of particles
Convert 0.00037 grams to correct scientific notation
37 x 10-4 grams
37 x 104 grams
3.7 x 10-4 grams
3.7 x 104 grams
What is the molar mass of tungsten (W)?
183.84 grams per mole
183.84 grams per atom
183.84 moles per gram
Both “a” and “b” are correct
What is the molar mass of the compound CaBr2?
119.98 g/mole
160.06 g/mole
199.88 g/mole
239.96 g/mole
Convert 8.00 moles of sodium chloride to grams of sodium chloride.
7.30 grams
467.52 grams
0.137 grams
467.52 moles
How many molecules are in 18.0 moles of carbon dioxide?
1.12 x 1028 molecules
5.34 x 1022 molecules
1.08 x 1025 molecules
3.34 x 1022 molecules
How many molecules are in 3.6 grams of NaCl?
0.06 molecules
1.0 x 1021 molecules
1.3 x 1026 molecules
3.7 x 1022 molecules
What is the mass of 1.0 x 106 atoms of Platinum (Pt)?
190 grams
3.2 x 10-16 grams
3.2 x 1016 grams
8.5 x 10-21 grams
Mole ratios for a reaction come from the ____
coefficients in a balanced chemical equation
molar mass of each substance
periodic table
total mass of the products
The limiting reactant in a chemical reaction is the substance that ____
has the smallest molar mass
has the smallest coefficient
determines the amount of product that can be produced
makes the reaction happen more quickly
Observe the model below. Which substance is the limiting reactant?
Nitrogen
Hydrogen
Ammonia
Nitrogen and Hydrogen
Observe the model below. Which substance is the excess reactant?
H2
O2
H2O
H2 and O2
Using the diagram and balanced equation, what is the correct mole ratio between oxygen and water?
4:4
5:4
4:6
5:6
The coefficients in the balanced chemical equation above represents which of the following?
4 NH3 + 5 O2 → 4 NO + 6 H2O
Molecules and grams
Molecules and moles
Moles and grams
Molecules, moles, and grams
C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H2O (g)
When 2.5 mole of O2 are consumed (used) in the reaction, __________ mole of CO2 are produced.
1.5 moles
3.0 moles
5.0 moles
6.0 moles
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?
3 mole Mg / 2 mole Fe
2 mole Mg/ 3 mole Fe
1 mole Fe/ 2 mole Fe
3 mole MgO / 2 mole Fe
