Science
9th Grade
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20 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How many moles are 98.3 grams of aluminum hydroxide, Al(OH)3? (Atomic mass of Al = 27, H= 1, O = 16)
1.26 moles
0.8 moles
7,673.4 moles
150 moles
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How many atoms are contained in 25 g of NaBr? (Atomic mass of Na = 23, Br = 35)
102.96 molecules
0.24 molecules
1.45x1023 molecules
2.34 x 1020molecules
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How many grams are in 1.2 x 1024 molecules of CO? (molar mass of CO = 28 g/mol)
28.2 g
55.8 g
6.02 g
1.2 g
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A mole of Neon contains
6.02 x 1023 _____.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
How many molecules are in 2.00 moles of H2O?
124x1024 molecules of H2O
1.20x1023 molecules of H2O
12.04 x1023 molecules H2O
124
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How many atoms of iodine are in a mole of iodine?
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How many gram is 0.5 mol of Copper atoms? (Cu:63,5g/mol)
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