Unit 1, Matter and at Struct, Dr

Unit 1, Matter and at Struct, Dr

RChem At Struct Unit Test Dr. Zisk/CCS/2010. NAME______

Multiple choice and short answer are 1 point each. Longer problems are 3 points each, as specified.

  1. What is the mass number of 199F? a) 19 b) 17 c) 9 d) 36
  1. What is the mass number of potassium-39? answer__39____
  1. How many protons are in the nucleus of phosphorous-33? answer _15___
  1. All atoms of a given single element must contain the same numbers of...

a) shells b) protons c) neutrons d) oxidation states

  1. Two different isotopes of a given element must have different...

a) net charges b) masses c) atomic numbers d) electron configurations

  1. The atom helium-4 differs from the atom lithium-7 by how many neutrons? answer_2 vs 4__
  1. What is the nuclear charge of carbon-14? a) 14 b) 10 c) 6 d) 0
  1. A carbide ion, C4-, formed from carbon-12, contains how many electrons? answer_10__
  1. How many electrons are there in an atom of in neutral oxygen? answer _8_
  1. The oxide ion, O2-, formed from oxygen-18, has the same electron configuration as...

a) Si b) C c) N d) Ne

  1. A sample is separated by physical means to form two different substances, so it must be...

a) a compound b) an element c) a mixture d) a molecule

  1. All atoms in a sample of isotopes of a given atom must have...
  2. The same mass numbers
  3. Different mass numbers
  4. Different charge numbers
  5. The same atomic numbers
  1. Atoms of the same element with different numbers of neutrons are called _isotopes.
  1. When a Ca atom is oxidized to Ca2+, the number of neutrons in its nucleus...

a) decreases b) increases c) remains the same

  1. (3 pts) Name the subatomic particles of the atom: _protons, neutrons, electrons__
  1. (3 pts) What charges are associated with each subatomic particle? _+, 0, and - respectively__
  1. How do you calculate net charge of an ion? __number of p’s minus number of e’s_____
  1. The total number of electrons in the valence shell of a chlorine atom in the ground state is...

a) 10 b) 8 c) 7 d) 17

  1. What is the electron configuration of groundstate sulfide, S2-? ___2-8-8______
  1. As an atom is ionized, its number of electrons... depending on whether it becomes a cation or an anion...

a) decreases b) increases c) it decreases or increases d) remains the same

  1. As an atom is ionized, its mass number...

a) decreases b) increases c) decrease or increase d) remains the same

  1. When an atom emits light, its electrons...
  2. move from ground state to excited state absorbing energy.
  3. move from ground state to excited state releasing energy.
  4. move from excited state to ground state releasing energy.
  5. move from excited state to ground state absorbing energy.
  1. Which is a correct excited state configuration for sulfur?

a) 2-8-5-0 b) 2-8-6 c) 2-8-5-1 d) 2-8-6-0

  1. To which shell can an electron be excited in sodium?

a) the 2nd shell b) the 3rd shell c) the valence shell d) the 4th shell

  1. (3 pts) How many moles of magnesium make up a 46.6 gram sample You must show your equation, your substitutions and your answer, with all units for full credit...

moles = given mass/GFM

mol = 46.6g/(24.3g/mol) = 1.92 mol

  1. (3 pts) Given 132 grams of carbon dioxide, how many moles do you have? You must show your equation, your substitutions and your answer, with all units for full credit...

first, the GFM of CO2 = 12 + 2(16) g/mol = 44 g/mol

then, moles = given mass/GFM = 132g/(18 g/mol) = 3.00 moles

  1. (3pts) Given the following combustion reaction in open air: C6H12O6 + 6O2  6CO2 + 6H2O... If 4 moles of the sugar reacts completely, then how many moles of carbon dioxide will be formed? Please show your work or explain your reasoning for full credit.

the ratio of sugar to carbon dioxide is 1:6,

so whatever sugar I start with, 6 times as much CO2 will be obtained…

so 4 sugars produce 24 CO2

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