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Questions and Answers
Which term refers to the vertical columns in the periodic table?
Which term refers to the vertical columns in the periodic table?
- Elements
- Groups (correct)
- Periods
- Isotopes
What is the atomic number of an element?
What is the atomic number of an element?
- The number of protons (correct)
- The number of electrons
- The sum of protons and neutrons
- The average of masses of all the isotopes
Who designed the periodic table and first formulated the Periodic Law?
Who designed the periodic table and first formulated the Periodic Law?
- Dmitri Mendeleev (correct)
- Mary Grace G. Bornales
- John Newlands
- Dmitri Ivanovich Mendeleev
What is the mass number of an element?
What is the mass number of an element?
Who discovered the atomic number based on the properties and atomic weight?
Who discovered the atomic number based on the properties and atomic weight?
Which term refers to the horizontal rows in the periodic table?
Which term refers to the horizontal rows in the periodic table?
What is the atomic mass of an element?
What is the atomic mass of an element?
Who discovered the Law of Octave?
Who discovered the Law of Octave?
When was the first periodic table created and how many elements were discovered at that time?
When was the first periodic table created and how many elements were discovered at that time?
What is the atomic number of an element?
What is the atomic number of an element?
Calculate the molecular weight of CO2.
Calculate the molecular weight of CO2.
Calculate the molecular weight for Al(OH)3.
Calculate the molecular weight for Al(OH)3.
Calculate the molecular weight for NaCl.
Calculate the molecular weight for NaCl.
A chemist has a jar containing 388.2 g of iron filings. How many moles of iron does the jar contain?
A chemist has a jar containing 388.2 g of iron filings. How many moles of iron does the jar contain?
A chemist needs 22g of phenol (C6H5OH) for an experiment. How many moles of phenol is this?
A chemist needs 22g of phenol (C6H5OH) for an experiment. How many moles of phenol is this?
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