Chapter 10: Chemical Quantities, vocab and key ideas
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| How can you convert amoung the count, mass and volume of something? | by knowing how the count, mass and volume relate to a common unit.
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| What is a mole? | a unit that is a specific number of particles.
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| What is the mole number or Avogardo's number? | 6.02 x10^23
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| The term representative particle refers to what? | the species present in a substance (usually an atoms, molecules or formula units.)
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| The representative particle for most elements is what? | the atom
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| What does the mole allow chemists to do? | count the number of representative particles in a substance.
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| What is the first step to find the number of atoms in a given number of moles of a compound? | first determine the sumber of representative particles.
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| How do you convert the number of moles in a compound to the number of representative particles? | multiply the number of moles by 6.02 x 10^23 representative particles/one mole.
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| How big is a mole? (the measurment) | HUGE
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| How do you determine the molar mass of an element and of a compound? | 1)the atomic mass of an element is the mass of a mole of the element 2) find the number of grams of each element in one mole of the compound. Then add the masses of the elements in the compound.
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| What was Avogadro's hypothesis? | that equal volume of gasses at the same temperature and pressure contain equal numbers of particles.
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| Standard temperature and pressure stands for what? | STP
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| What does standard temperature and pressure mean? | a temperature of degree 0 C and the pressure of 101.3 k Pa, or 1 atmosphere.
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| The quantitly 22.4 is called what? | molar volume.
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| Molar volume is used to convert between what? | between the number of moles of gas and the volume of gas at STP.
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| What is percent composition? | the percent by mass of each element in the compound.
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| What are the steps in finding the percent by mass of an element in a compound? | find the number of grams in an element, divide by the mass in grams of the compound, then multiply it by 100%.
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| What does the empirical formula of a compound give? | the lowest whole-number ratio of the atms or moles of the elementin a compound.
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