A molecule of butene consists of 4 carbon atoms and 8 hydrogen atoms. What is butene's empirical formula? Provide your answer below:
We can always determine the precise structural formula from the: Select the correct answer below: empirical formula molecular formula molecular mass none of the above
Molecules with similar properties might have the same: Select the correct answer below: structural formula molecular formula empirical formula all of the above
Molecules that have the same number of the same types of atoms connected in the same way have the same: Select the correct answer below: structural formula molecular formula empirical formula all of the above
Which formula tells us the most about a molecule? Select the correct answer below: structural formula molecular formula empirical formula These all tell us the same amount.
If the empirical formula for a compound is C3H8, which of the following are possible molecular formulas? Select all that apply. CH4 C3H8 C9H16 C6H16
A molecule of pentene consists of 5 carbon atoms and 10 hydrogen atoms. What is pentene's empirical formula? Provide your answer below:
Based on the rules for naming oxyacids, what is the correct name for HC2H3O2? Select the correct answer below: acetic acid hydrogen acetate hydroacetic acid none of the above
Which of these is NOT a binary acid? Select the correct answer below: HCl H2S H2SO4 HF
Which of the following is correct nomenclature for a binary acid? Select the correct answer below: hydrofluoric acid hydrochloric acid hydroiodic acid all of the above
Based on the rules for naming oxyacids, what is the correct name for H2CO3? Select the correct answer below: hydrogen carbon oxide hydrogen carbonate hydrocarbonic acid carbonic acid
When described as an acid, the correct name of H2S is: Select the correct answer below: sulfuric acid sulfurous acid hydrogen sulfide acid hydrosulfuric acid
Aqueous HAt is called: Select the correct answer below: hydroastatic acid hydrogen astatine acid hydrogen astatate hydrogen astatide
Which of the following is NOT a rule in naming binary acids? Select the correct answer below: Use the prefix hydro-to represent hydrogen. Acid becomes the second word of the compound. The second element should be modified using an -ate at the end. The other nonmetallic element name receives the suffix -ic.
What is the name of the binary acid: HBr? Select the correct answer below: bromic acid hydrobromine hydrogen bromide hydrobromic acid
HF in the aqueous phase will be called: Select the correct answer below: hydrogen fluoride hydrofluoric acid hydrofluoride hydrogen fluorine
HClO4 is called: Select the correct answer below: chlorous acid chloric acid perchloric acid hypochloric acid
What is the formula of the ionic compound aluminum sulfate? Provide your answer below:
Ca(ClO3)2 is called Select the correct answer below: calcium chlorite calcium hypochlorite calcium chlorate calcium perchlorate
Which of the following correctly pairs the ion name with the ion symbol? Select the correct answer below: iodine, I− sulfite, S2− lithium cation, Li+ nitride, N−
What is the chemical formula for chromium(III) phosphate? (hint: phosphate has a 3- charge) Provide your answer below:
Which of the following is named using the unmodified element name and adding the word "ion"? Select the correct answer below: simple cations (monatomic cations of elements of only one possible charge) simple anions (monatomic anions of elements of only one possible charge) simple protons simple neutrons
Which of the following correctly pairs the formula with the metal ion name? Select the correct answer below: iron(II) nitride, Fe3N2 tin(IV) sulfide, SnS2 manganese(IV) nitride, Mn3N4 all of the above
MgCl2 is called Select the correct answer below: magnesium dichloride magnesium chlorate monomagnesium chlorate magnesium chloride
Write the formula for a lithium ion. Be sure to include the charge of the ion. Provide your answer below:
Which of the following correctly pair the polyatomic ion with its formula? Select all that apply. Select all that apply: cyanide, CN− chlorate, ClO3− sulfate, SO− nitrate, NO3−
What is the name of SnO2? Select the correct answer below: tin(II) oxide tin(I) oxide tin(IV) oxide tin oxide
An alternative name for iron(II) chloride is: Select the correct answer below: iron chloride ferrous chloride ferric chloride ferrum chloride
N2O5 is called Select the correct answer below: nitrogen oxide. nitrogen pentoxide. dinitrogen oxide. dinitrogen pentoxide.
When naming binary covalent compounds, the element listed first will be the one that is Select the correct answer below: more metallic. less metallic. heavier. lighter.
What is the molecular formula for phosphorus pentachloride? Provide your answer below:
Which of the following symbols does NOT represent an element? Select the correct answer below: C Co O CO
The symbol Fe could refer to which of the following? Select the best answer below. Select the correct answer below: an iron atom The element known as "iron." a macroscopic sample of iron all of the above
The chemical symbol "CL" with two capital letters is used to represent which element? Select the correct answer below: chlorigen chlorine clorominium it is not a valid chemical symbol
Which element is NOT abbreviated based on an ancient name? Select the correct answer below: iron radium sodium lead
Ammonium nitride is formed from the NH4+ cation and the N3− anion. What is the correct formula for this compound? Provide your answer below:
Atoms that form ions with a negative charge are known as Select the correct answer below: neutrons protons cations anions
Atoms that form ions with a positive charge are known as Select the correct answer below: neutrons protons anions cations
Barium phosphate is formed from the Ba2+ cation and the PO43− anion. What is the correct formula for the formed compound? Provide your answer below:
What is a cation? Select the correct answer below: an atom that has lost electrons an atom that has gained electrons an atom with a neutral charge an atom with a negative charge
Different ions of a given element will have differing numbers of Select the correct answer below: protons neutrons electrons molecular formulas
Which is true regarding ionic compounds? Select the correct answer below: They consist of discrete, neutral molecules. Electrons are shared. The total positive charge equals the total negative charge. none of the above
Which describes ionic compounds? Select the correct answer below: Ionic compounds contain only neutral atoms. Ionic compounds are comprised of atoms that share electrons equally. Ionic compounds are electrically neutral because they consist of ions with opposite charges that are balanced. none of the above
Which of the following is NOT a molecular compound? Select the correct answer below: SnSe2 NH3 PCl5 N2O4
In general, covalent bonding can occur between which of the following? Select the correct answer below: An ion and a neutral atom Two ions of opposite charge Two neutral atoms Any combination above
Which of the following compounds are considered ionic compounds? Select all that apply. Select all that apply: HCN LiOH FrI CaC2
Which of the following is a molecular compound? Select the correct answer below: Al2O3 SO2 NH4 NO3 KHCO3
Which of the following is a molecular compound? Select the correct answer below: HF NaF CaCl2 MgO
Which type of bond is most likely to form between charged particles? Select the correct answer below: ionic covalent metallic impossible to tell
Which of the following is NOT an ionic compound? Select the correct answer below: NaClO NO Li2O BeF2
What is the empirical formula for the ionic compound composed of calcium ions and bromide ions? Do not include the phase abbreviation. Provide your answer below:
Covalent bonds are found in which of the following compounds? Select the correct answer below: FeBr3 Fe2N SrO N2H2
Which of the following are NOT molecular compounds? Select all that apply: CO AlF3 HNO3 KBr
Drag the elements from the list of elements and drop them into the appropriate boxes: main group (1, 2, and 13 − 18 ) or transition metals. Provide your answer below: sodium magnesium tantalum molybdenum cobalt cesium scandium niobium tin tellurium
Ions may consist of Select the correct answer below: one atom two atoms three or more atoms any of the above
Copper (II) iodide is formed from the Cu2+ cation and the I− anion. What is the correct formula for this compound? Provide your answer below:
Which of the following statements about molecular compounds are true? Select all that apply: Molecular compounds are typically composed of a metal and a nonmetal. Molecular compounds typically have low melting and boiling points. Molecular compounds are composed of discrete molecules. Under normal conditions molecular compounds often exist as gases, liquids, or low-melting solids.
Why is phosphate introduced in the last step of the scheme above? Select the correct answer below: Only alkaline earth metal cations form insoluble phosphates. A large number of cations form insoluble phosphates. Phosphate is a selective reagent in qualitative analysis. Phosphate forms soluble compounds with most metal cations.
Ionic compounds tend to be: Select the correct answer below: negatively charged positively charged neutral depends on the compound
When chlorine becomes an ion, it has the same electron configuration as: Report your answer as an element symbol. Provide your answer below:
All of the following are ionic compounds except: Select the correct answer below: SO2 NaOH FeBr3 SrI2
Fill in the blanks for the reagents used in the first three steps of the qualitative analysis scheme shown below. Provide your answer below:
Given the electron configuration of Fe is 1s2 2s2 2p6 3s2 3p6 4s2 3d6, determine the electron configuration of Fe3+ Provide your answer below:
Ions typically have: Select the correct answer below: properties that are identical to those of the corresponding neutral atom no net charge properties that are dramatically different from those of the corresponding neutral atom negative charge
Ionic compounds tend to form between a nonmetal with and a metal with Select the correct answer below: high electron affinity, high ionization energy high electron affinity, low ionization energy low electron affinity, high ionzation energy low electron affinity, low ionization energy
How does the pH affect the solubility of sulfide compounds? Select the correct answer below: Most sulfides are soluble in basic conditions but not acidic conditions. Most sulfides are soluble in acidic conditions but not basic conditions. When the pH is low, the concentration of S2− is high, so only compounds with a large Ksp will precipitate. When the pH is low, the concentration of S2− is small, so only compounds with a small Ksp will precipitate.
Ionic compounds are also known as: Select the correct answer below: sugars salts fats none of the above
A solution contains nitrates of silver, copper, nickel, cesium, and barium. Fill in the qualitative analysis scheme below with the products of the precipitates formed after each step of the procedure. Do not change the formulas of the compounds already given. Provide your answer below:
Review the qualitative analysis scheme in Figure 1 above and determine which of the following precipitates might be created (assuming the corresponding cation was present in the original solution) in the third step (raising the pH of the solution by adding NaOH). Select all that apply. Select all that apply: ZnS Ba3(PO4)2 AgCl Cr(OH)3
A solution containing nitrates of silver, iron, and calcium is analyzed by the scheme above. A precipitate forms in the last step of the scheme. What is the formula for the precipitate? Provide your answer below:
Given the electron configuration of Cl ([Ne] 3s2 3p5), determine the charge that an ion of Chlorine would have. Your answer should include only a number and a sign (+ or - ). Provide your answer below:
On an energy diagram representing the distance between two hydrogen atoms, what does the lowest energy represent? Select the correct answer below: the radius of a hydrogen atom the radius of a hydrogen nucleus the starting distance of the atoms the ideal covalent bond length
A covalent bond holds two atoms near each other because Select the correct answer below: the two electrons that form the bond repel one another. the two electrons that form the bond are attracted to a single nucleus. the two electrons that form the bond are attracted to both nuclei. two nuclei of the atoms attract one another.
Which of the following has a polar covalent bond? Select the correct answer below: H2 Cl2 IBr O2
Electrons in a pure covalent bond: Select the correct answer below: have an equal probability of being near either nucleus have a greater tendency to be closer to one atom than the other travel between the two atoms depends on the identity of the atoms participating in the bond
When covalent bonds break: Select the correct answer below: energy is absorbed energy is released mass is gained mass is lost
When covalent bonds form: Select the correct answer below: energy is absorbed energy is released mass is gained mass is lost
When comparing H2 and HCl, the hydrogen atom in the HCl molecule will: Select the correct answer below: be surrounded by less electron density be surrounded by more electron density have a greater covalent radius have a smaller covalent radius
In a polar covalent bond, the atom that attracts the electrons more strongly has: Select the correct answer below: the partial positive charge the neutral charge the partial negative charge none of the above
H2(g) + F2(g) → 2HF(g) BE (H−H) = 432 kJ BE (F−F) = 154 kJ BE (H−F) = 565 kJ What is the enthalpy of the reaction using bond energies? Your answer should have three significant figures. Provide your answer below: kJ Bond Energies and Enthalpy of Formation Use the given average bond energy values to estimate AH for the following reaction in the gas phase. H2 + F2 → 2HF = DH-H = 432 kJ/mol DF-F = 154 kJ/mol DH-F 565 kJ/mol = The units expected here are simply "kJ". The implication is that the reaction coefficients refer to numbers of moles.
H2 (g) + C2H4 (g) → C2H6 (g) BE(C−H) = 413 kJ BE(H−H) = 436 kJ BE(C = C) = 614 kJ BE(C−C) = 348 kJ What is the enthalpy of the reaction using bond energies? Your answer should have three significant figures. Provide your answer below: kJ
Use the information below to answer the question that follows. CO(g) + H2(g) ⟶ CH2O(g) Bond energy of (C≡O) = 1072 kJ Bond energy of (C=O) = 802 kJ Bond energy of (H−H) = 436 k J Bond energy of (C−H) = 413 kJ What is the enthalpy of the reaction using bond energies? Your answer should have three significant figures. Provide your answer below: kJ