Chemistry Questions and Answers

# Part 1 (1 point) For Parts 1 and 2, write your answer using the format `atom-A`. Make sure to spell the name of the atom correctly! The isotope with 18 protons and 17 neutrons is: # Part 2 (1 point) The isotope with 9 protons and 8 neutrons is: # Part 3 (1 point) For Parts 3 and 4, write your answer using the format `complete isotope symbol` including the superscripting and subscripting of A and Z. The isotope with 17 protons and 20 neutrons is: # Part 4 (1 point) The isotope with 19 protons and 20 neutrons is: # Part 5 (1 point)

"Give the nuclear symbol (isotope symbol) for the isotope of bromine, Br, that contains 46 neutrons per atom. A. 80Br B. 81Br C. 82Br D. 83Br"

The molar mass of Nitric acid HNO3 is, (N= 14 amu, O=18g/mol, H= 1amu) Select one: a. $62 \mathrm{~g} / \mathrm{mol}$ b. $34 \mathrm{~g} / \mathrm{mol}$ c. $63.01 \mathrm{~g} / \mathrm{mol}$ d. $33 \mathrm{~g} / \mathrm{mol}$

"Which of the following statements correctly describe theoretical yield in a chemical reaction? A. The theoretical yield is the amount of product expected from a given amount of reactant based on the balanced chemical equation. B. The theoretical yield is smaller than the actual yield. C. The theoretical yield considers the fact that side reactions may occur. D. The theoretical yield is the maximum amount of product that can be formed."

"The central atom in which of the following does not violate the octet rule? A. SF₄ B. ICl₄⁻ C. XeF₄ D. CF₄ E. KrF₂"

"A chlorine atom that has 17 protons and 18 neutrons is called what?"

Draw the Lewis structure for the acetate ion, CH3CO2^-, including any important resonance structures. label each atom with its formal charge. thank you in advance!

What is the molar mass of NO?

The name given to an aqueous solution of $\mathrm{HClO}_{3}$ is chloric acid. hydrochloric acid. hypochloric acid. chlorous acid. hypochlorous acid.

"The shape of a water molecule is: A. trigonal planar B. tetrahedral C. linear D. bent"

"What is the electron domain geometry of the compound I^−(3)? A. Linear B. Trigonal Planar C. Tetrahedral D. Octahedral"

Draw the Lewis structure for PCl5 in the window below and then answer the questions that follow. Do not include overall ion charges or formal charges in your drawing. b. What is the electron-pair geometry for P in PCl5 ? c. What is the the shape (molecular geometry) of PCl5?

"Automotive batteries are an example of which hazard class? A. Poisonous or toxic materials B. Oxidizers C. Flammable solids D. Corrosive materials "

Give the name for each compound given its chemical formula: | Name of Compound | individual ions | Formula | | --- | --- | --- | | lithium cyanide | $$Li^+ \cdot CN^-$$ | LiCN | | iron(III) sulfate | $$Fe^{3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+55+56+57+58+59+60+61+62+63$$ | | calcium iodide | $$Ca^{2+}$$ | Ca(IO3)2 | | tin(IV) dichromate | | | | cadmium nitrite | | | | copper(II) acetate | $$Cu^{2+}$$ | CuO2 | | zinc carbonate | $$Zn^{2+}$$ | ZnO2 | | lead(II) phosphide | $$Pb^{2+}$$ | PbO2 | | potassium sulfite | | | | cobalt(II) nitride | | | | nickel(II) permanganate | | | Give the name for each compound given its chemical formula: | Formula | Individual Ions | Name of Compound | | --- | --- | --- | | MgCl2 | Mg+2 Cl- | magnesium chloride | | LiOH | Li+ OH- | Litium Hydroxide | | ZnCO3 | Zn+2 (CO3)2- | Zinc (I) Carbonate | | K2S | K+ S2- | Dipotassium Sulfide | | FePO4 | Fe+3 (PO4)3- | Iron (I) Phosphate | | SnO2 | Sn+2 (Cl2)2- | Tin (I) Peroxide | | CuBr2 | Cu+2 Br- | Copper (I) Bromide | | Ag3N | Ag+ N3- | Silver (III) Nitride | | Mn(CN)2 | Mn2 CN- | Manganese (I) Cyanide | | AgC2H3O2 | Ag+ C2H3O2 | Silver (I) Acetate |

Draw a stepwise mechanism for the following reaction: Part 1: Part 2: Part 3 out of 4

33) Which formula/name pair is incorrect? A) $\mathrm{Mn}(\mathrm{NO} 2) 2$ manganese(II) nitrite B) $\mathrm{Mn}(\mathrm{NO} 3) 2$ manganese(II) nitrate C) $\mathrm{Mg}(\mathrm{NO} 3) 2$ magnesium nitrate D) $\mathrm{Mg}(\mathrm{MnO} 4) 2$ magnesium permanganate E) Mg3N2 magnesium nitrite Oxygen is an odorless gas discovered independently by Joseph Priestly and Karl Scheele, it is the third most abundant element in the universe.

What is the difference between ionic, covalent, and hydrogen bonds?

What is the conjugate acid for NH3 | Base | Conjugate Acid | | :-- | :-- | | $\mathrm{HSO}_{4}^{-}$ | $\mathrm{H}_{2} \mathrm{SO}_{4}$ | | $\mathrm{SO}_{4}^{2-}$ | | | $\mathrm{NH}_{3}$ | |

Give an IUPAC name for the following compound: Give an IUPAC name for the following compound: Give an IUPAC name for the following compound: Drew 3-hexene Give an IUPAC name for the following compound:

Calculate the mass of water that contains 10^22 molecules.

Pre-Lab Exercise 24-3 Digestive Enzymes Chemical digestion is one of the main functions of the digestive system and is carried out with the help of numerous digestive enzymes. List the organ that produces each enzyme and the enzyme's function in table 24-3. | | | | | --- | --- | --- | | 24.3 Digestive Enzymes | | | | Enzymes | Amino | Ammonio | | Salivary amylase | | | | Pepsin | | | | Trypsin | | | | Pyoverdin lipase | | | | | | | | B-cell lecithin receptor | | |

How many valence electrons are in an atom of magnesium (atomic number 12)?

Structure for ONE of the resonance forms and show all formal charges on the appropriate atom(s). There are three formal charges to be shown. Now, drasw the other resonance forms of your furst structure, above, including all formal charges appropriately. Chlorate ion (CIO3^1-)has three resonance structures. Draw the Lewis Structure for ONE of the resonance forms and show all formal charges on the appropriate atom(s). There are three formal charges to be shown.

Assuming equal concentrations and complete dissociation, arrange these aqueous solutions by their freezing points. # Highest freezing point | Lowest freezing point | | | | | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Answer Bank | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | K₂SO₄ | Li₃PO₄ | NaNO₃ | | | | | | | | | | | | | |

Draw the Lewis structure for SiH4. Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Include all hydrogen atoms. To change the symbol of an atom, double-click on the atom and enter the letter of the new atom. Draw the Lewis structure for CO. Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Draw the Lewis structure for SF2. Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. To change the symbol of an atom, double-click on the atom and enter the letter of the new atom. Draw the Lewis structure for H2SO4 (H is bonded to O). Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Include all hydrogen atoms. To change the symbol of an atom, double-click on the atom and enter the letter of the new atom.

What is the name of the molecular compound $\mathrm{P}_{2} \mathrm{O}_{5}$ ? Enter the name of the compound. View Available Hint(s) Phosphorus pentoxide 1 Phosphorus pentoxide is the name for $\mathrm{PO}_{5}$, not $\mathrm{P}_{2} \mathrm{O}_{5}$. No credit lost. Try again. Submit Previous Answers

"Select the correct answer from each drop-down menu. Complete the paragraph to describe the characteristics of a sulfur dichloride (SCl2) molecule. The Lewis structure and table of electronegativities are given. An SCl2 molecule has ____ bonds and a ____ molecular shape. As a result, an SCl2 molecule is ____."

1) In the Lewis structure of $\mathrm{HCO}_{3}^{-}$, all three oxygen atoms are attached to the carbon atom, and the hydrogen is attached to one of the oxygen atoms. After assigning all the valence electrons, the carbon has just six electrons, so it is short of a full octet. At that point you need to convert a lone pair on one of the oxygens into another bond between that oxygen and the carbon. The problem is, there are two different types of oxygen here: the two oxygens with just a single bond to carbon, and the one oxygen with a bond to carbon and a bond to hydrogen. a. Draw the Lewis structure you would get if you had used a lone pair from one of the two oxygens that isn't bonded to the hydrogen. (1 pt.) b. Draw the Lewis structure you would get if, instead, you had used a lone pair from the oxygen that is bonded to the hydrogen. (1 pt.) c. Explain why the first of those two Lewis structures is the more stable one. (1 pt.) a.) $\mathrm{HCO}_{3}^{-}: \theta$ b.) c.)?

1. A group of two or more substances that are physically restricted are called a "substance". 2. Mixtures that are constant and mostly mixed throughout are called "organics". 3. Mixtures that are not evenly mixed together and do not have definite composition are called "organics". 4. By definition, stores have no overall chemical charge. That means that there must be "one" portion than electrons. 5. The same number of protons and electrons. 6. The same number of protons and electrons. 7. There must be "one" or more electrons. 8. When the number of electrons does not equal the number of protons in an atom, the store has a charge and is called an "ion". 9. The electrically neutral part of an atom is called "electrons". 10. Adding one proton to an element of weight would make a "electron". 11. The external columns on the periodic table are called "electrons". 12. The horizontal rows on the periodic table are called "electrons". 13. The elements in the middle of the table are called "electrons". 14. The element in the middle of the table is called "electrons". 15. The element in the center of the table is called "electrons". 16. The elements in the middle of the table are called "electrons". 17. The elements in the center of the table are called "electrons". 18. Elements in the first group have one outer shell electron and are extremely reactive. They are rarely found alone in nature and are called "electrons". 19. Elements in the second group have 2 outer shell electrons and are also very reactive. They are called "electrons". 20. Elements in the third group have 2 outer shell electrons and are also very reactive.

Draw the Lewis structure for H2O2 molecule. Be sure to include all lone pair electrons and nonzero formal charges.

The electron geometry of a water molecule is tetrahedral even though the molecular geometry is bent.

What are the five parts of an atom?

Write the balanced chemical reaction of baking soda (sodium bicarbonate) and vinegar (acetic acid).

What is the difference between groups and periods on the periodic table? What do they tell you?

Draw The Lewis Dot Structure for CF2O and fill in the following: # of single bonds around central atom : # of double bonds around central atom : # of triple bonds around central atom : # of lone pairs around central atom : what is the electron geometry : what is the molecular geometry : what is the bond angle : Is this structure polar or nonpolar :

Draw a Lewis dot diagram for H2O2 (hydrogen peroxide), and use the oxidation - state method of electron book keeping to determine how many electrons each atom should be assigned.

Which of the following statements about the structure of H2S is false? - H2S has a trigonal planar electron-domain geometry. - The Lewis structure of H2S has eight valence electrons. - The S-H-S angle in H2S is less than 100.5°. - There are two nonbonding electron domains on the S atom in H2S.

What is the Lewis dot structure of Na+?

Draw the products of the following reactions.

Determine which is the larger species. $\bigcirc \mathrm{K}^{+}$ $\bigcirc \mathrm{K}$ Determine which is the larger species. $\bigcirc \mathrm{O}$ $\bigcirc \mathrm{O}^{2-}$ Determine which is the larger species. $\bigcirc \mathrm{O}^{2-}$ $\bigcirc \mathrm{Na}^{+}$