atomic mass
What is the device normally used to weigh atoms?
mass spectrometer
Does one mole have a mass larger, smaller, or equal to its relative formula mass?
equal
Which is more common in chemistry, endothermic or exothermic reactions?
exothermic
What is a relative atomic mass
the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon-12.
6.02 × 1023 is also known as Avogadro's number or Avogadro's constant. What does the number represent?
the number of molecules in a mole
is condensation exothermic or endothermic?
exothermic
What are isotopes?
atoms of the same element that have different masses because they have different numbers of neutrons
What is a molar mass?
the mass of one mole
Name two of the three ways of producing salts
1. synthesis
2. neutralization
3. precipitation
What is the relative atomic mass of helium, rounded to the nearest whole number?
4
Which has a larger molar mass, iron or oxygen?
iron
Is a cation positive or negative?
positive
what is a relative formula mass?
the sum of the relative atomic masses of the elements present in a formula unit
Which has a larger molar mass, calcium carbonate or magnesium oxide?
calcium carbonate
Is an anion positive or negative?
negative