CHM 101- EXAM #2 – Flashcards
Unlock all answers in this set
Unlock answersquestion
| decreases going down within a group |
answer
| The ionization energy of atoms |
question
| 3+ |
answer
| What is the ionic charge of an ion with 13 protons and 10 electrons? |
question
| 39.1g |
answer
| The molar mass of potassium is |
question
| decomposition |
answer
| The following reaction takes place when an electric current is passedthrough water. It is an example of a __________ reaction. 2H2O -> 2H2 + O2 |
question
| the number of atoms of each element is the same in reactants and products |
answer
| A chemical equation is balanced when |
question
| ionic |
answer
| If the electronegativity difference between elements X and Y is 2.1, the bond between the elements X-Y is |
question
| decreases going across a period |
answer
| The atomic size of atoms |
question
| the valence electrons |
answer
| In an electron-dot structure of an element, the dots are used to represent |
question
| its group number |
answer
| The number of valence electrons found in an atom of a Group A element is equal to |
question
| 6.02 x 10^23 |
answer
| One mole of particles of any substance contains how many particles? |
question
| has a net charge of zero |
answer
| An ionic compound |
question
| in the outermost energy level of an aatom |
answer
| Valence electrons are electrons located |
question
| atoms lose, gain, or share valence electrons to have 8 valence electrons |
answer
| The octet rule indicates that |
question
| combination |
answer
| In a __________ reaction, two or more elements or compounds form one product. |
question
| carbon |
answer
| Which of the following elements does NOT exist as a diatomic molecule? |
question
| particles in one mole of a substance |
answer
| Avogadro's number is the number of |
question
| atoms are held together by sharing electrons |
answer
| In a molecule with covalent bonding, |
question
| an exothermic reaction |
answer
| What type of reaction is this? CH4 + 2O2 -> CO2 + 2H2O + 218 kcal |
question
| covalent compounds |
answer
| The types of compounds that use prefixes in their names are |
question
| single replacement |
answer
| What is the classification for this unbalanced reaction? Fe + HCl -> FeCl3 + H2 |
question
| energy is absorbed by the system |
answer
| In an endothermic reaction, |
question
| the number of electrons in each energy level |
answer
| The electron arrangement of any particular atom shows |
question
| single covalent bonds do not give all of the atoms in one molecule eight valence electrons |
answer
| Double and triple bonds form because |
question
| the energy needed to remove the least tightly bound electron |
answer
| Ionization energy is |
question
| metals; cations |
answer
| In ionic compounds, _________ lose their valence electrons to form positively charged ________. |
question
| 2 moles Fe2O3 / 3 moles of O2 |
answer
| Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3 produced? 4Fe + 3O2 -> 2Fe2O3 |
question
| shape of a molecule |
answer
| The VSEPR theory allows us to determine the most favorable |
question
| loss of electrons or gain of oxygen |
answer
| Which of the following describes an oxidation reaction? |
question
| molecule |
answer
| A(n) ____________ is the smallest neutral unit of two or more atoms held together by a covalent bond. |
question
| CO2 |
answer
| What is the greenhouse gas formed in combustion reactions? |
question
| bananas, orange juice, milk, potatoes |
answer
| What are 3 good sources of K+ ions? |
