Inorganic Chemistry Questions

Write the formulas for the compounds described by the following compositions. (a) twice as many hydrogen atoms as sulfur atoms (b) 1.5 times as many oxygen atoms as nitrogen atoms (c) one-half as many calcium ions as chloride ions

A 5.05 g sample of quartz (SiO 2) contains 2.36 g of silicon. What are the percentages of silicon and oxygen in quartz? 53.3% Si and 46.7% 46.7% Si and 53.3% 29.9% Si and 70.1% 70.1% Si and 29.9% 46.7% Si, and insufficient information to calculate %

Calcium phosphate, Ca3(PO4) 2, is used to treat calcium deficiencies. What is the molar mass of this compound? 87.05 g/mol 167.05 g/mol 279.21 g/mol 230.02 g/mol 310.18 g/mol

If the displacement (size) of a motorcycle engine is 1500 cm 3, which of the following equivalences is incorrect? V= 1500 mL V= 1.500 L V = 1.500 × 10-3 m 3 V = 15.00 m 3 both V= 1500 mL and V = 15.00 m 3

Calculate the molar mass of Fe 3(PO 4) 2. 237.64 g/mol 262.52 g/mol 245.79 g/mol 357.49 g/mol 525.04 g/mol

Malachite is a green colored mineral that is 57.5% copper. What mass of copper is present in a 250.0 g sample of malachite? 63.6 g 127 g 435 g 36.5 g 144 g

One mole of methane (CH4) and one mole of oxygen (O2) would have the same number of atoms. True False

1) A 0.15 M aqueous solution of the weak acid HA at 25.0 °C has a pH of 5.35. The value of Ka for HA is A) 1.3 x 10^-10 B) 3.0 × 10^-5 C) 1.8 x 10^-5 D) 7.1 x 10^-9 E) 3.3 x 10^4

Barium sulfate is a compound used to assist in diagnosing medical problems through x-ray analysis and is 58.8% barium. What mass of barium is present in a 620 mg tablet of barium sulfate? 81 mg 230 mg 360 mg 1100 mg 11 mg

4) Calculate the pH of a solution prepared by dissolving 0.150 mol of benzoic acid and 0.300 mol of sodium benzoate in water sufficient to yield 1.00 L of solution. The Ka of benzoic acid is 6.30 x 10-5 A) 2.516 B) 4.195 C) 4.502 D) 10.158 E) 3.892

Use this simulation to explore strong bases and answer the question below. Make sure to explore both the "Molecules" and "Graph" views. Based on this simulation, what is true of bases? Select all that apply. Strong bases have lower pH values than weak bases. When a strong base dissociates, the concentration of the strong base in the solution becomes negligible. Strong bases completely dissociate into M (metal cation) and OH Strong bases dissociate to form more hydroxide ions than a weak base. The products formed when a strong base dissociates can carry out a reverse reaction to form the strong base once more.

Rutherford's scattering experiment demonstrated the existence of protons. the existence of electrons. the existence of neutrons. that most of the mass of an atom is in its nucleus. that the charge-to-mass ratio of an electron is constant.

In any neutral atom the number of electrons equals the number of protons. the number of electrons is less than the number of protons. the number of electrons is greater than the number of protons. the number of electrons is equal to the number of neutrons. the number of neutrons is always equal to the number of protons.

Select the substance below which is a compound. O NO Olr Ni = Co Rf

The isotopes of hydrogen show much greater difference in physical properties than are found between the isotopes of the other elements. Which of the following is not correct order? H₂ < D₂ < T₂ (Mass of atom (amu)) H₂ < D2 (Latent heat of fusion) H₂ < D₂ (Latent heat of Vaporization) H₂> D2 > T2 (Magnitude of freezing point (K))

How do you know if a base is strong or weak? Use this simulation to explore strong bases and answer the question below. Make sure to explore both the "Molecules" and "Graph" views. Based on this simulation, what is true of bases? Select all that apply. Strong bases have lower pH values than weak bases. When a strong base dissociates, the concentration of the strong base in the solution becomes negligible. Strong bases completely dissociate into M (metal cation) and OH Strong bases dissociate to form more hydroxide ions than a weak base. The products formed when a strong base dissociates can carry out a reverse reaction to form the strong b once more.

A sample of hard water contains 2 mg CaCl₂ and 2 mg MgCl2 per liter. Calculate the hardness of water in terms of CaCO3 present in 106 parts of water. Molar mass of CaCl2 - 111 g mol-¹, MgCl2 - 95 g mol-1 and CaCO3 - 100 g mol-1. 1.95 ppm 2.50 ppm 3.90 ppm 125 ppm

Phosphorus containing organic compound is heated with Na2O2 to give compound A. Compound A is boiled with HNO3 and then treated with ammonium molybdate to give yellow precipitate B. Molecular formula of compound B is (NH4)3[P(M03010)4] (NH4)3[P(M03010)5] (NH4)3[P(M03010)6] (NH4)3[P(M03010)3]

Oleum is considered as a solution of SO3 in H₂SO4, which is obtained by passing SO, in solution of H₂SO4 When 100 g sample of oleum is diluted with desired weight of H₂O then the total mass of H₂SO4 obtained after dilution is known as % labelling in oleum. For example, a oleum bottle labelled as 109% H₂SO4 means the 109 g total mass of pure H₂SO4 will be formed when 100 g of oleum is diluted by 9 g of H₂O which combines with all the free SO3 present in oleum to form H₂SO4 as SO3 + H₂O → H₂SO4 What is the % of free SO3 in an oleum that is labelled as '104.5% H₂SO4' ?

From your work on the previous screen, you saw that double-replacement reactions follow the following general pattern: AB+CD→ AD + CB Based on this, which of the reactions below are double-replacement reactions? Mg(s) + 2HCl(aq) → MgCl₂ (aq) + H₂(g) 2AgNO3(aq) + Zn(s) → 2Ag(s) + Zn(NO3)2(aq) BaCl₂ (aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq) Pb(NO3)2(aq) + 2KI(aq) → 2KNO3(aq) + PbI₂ (s)

A bottle of soda has a volume of 474 mL. What is this volume in L? 4.74 L 0.474 L 47.4 L 2.11 L 0.00211 L

Compared to pure water, an equal volume of NaCl salt water solution will have a ... Higher vapor pressure and higher freezing point and higher boiling point. Lower vapor pressure and lower freezing point and higher boiling point. Lower vapor pressure and lower freezing point and lower boiling point. Higher vapor pressure and higher freezing point and lower boiling point.

A characteristic of a substance that involves the transformations the substance can undergo to produce a different substance is a physical property. a chemical property. a physical change. a material property. a characteristic property.

The density of aluminum is 2.7 g/cm3. What is the mass of a piece of aluminum foil which is 10.0 cm by 5.0 cm by 0.0018 cm thick? 0.090 g 3.3 × 10-² g 0.24 g 1.4 × 10² g 19 g

The element magnesium, Mg, has three common isotopes:24Mg, 25 Mg, and 26Mg. The difference between these three isotopes is the number of neutrons. the number of electrons. the number of protons. the number of protons and electrons. their physical state.

When a non-polar molecules evaporate, which bonds are broken? Covalent bonds are broken between atoms within the non-polar molecules. lonic bonds are broken between neighboring molecules. Dipolar bonds are broken between neighboring molecules. Dispersion forces are broken between neighboring molecules.

Carbon disulfide, (CS₂) has what electronic and what molecular structure according to VSEPR theory? Tetrahedral, bent Linear, linear. Tetrahedral, trigonal pyramidal Trigonal planar, trigonal planar none of these. Tetrahedral, tetrahedral

By which of the following mechanisms does a catalyst operate? A catalyst increases the concentration of the reactants. A catalyst provides a reaction pathway that has a greater enthalpy. A catalyst provides a reaction pathway that has a lower activation energy. A catalyst increases the energy of the transitions state. A catalyst serves as a reactant and is consumed.

Which is the correct electron configuration of Cu? 1s² 2s² 2p6 3s² 3p6 4s² 4d⁹ 1s² 2s² 2p6 3s² 3p6 4s² 3d⁹ 1s² 2s² 2p6 3s² 3p6 4s² 3d4 1s² 2s² 2p6 3s2 3p6 4s¹ 4d⁹ 1s² 2s² 2p6 3s² 3p6 4s¹ 3d10

what is the equilibrium expression for the following reaction? NH4NO3(s) <......> NH4+ (aq) + NO3-(aq) [NH4NO3] / [NH4+]+[NO3 -] [NH4+][NO3] [NH4+]+[NO3-]/[NH4NO3] [NH4+][NO3-]/[NH4NO3] [NH4NO3]/[NH4+][NO3]

A balloon has a volume of 8000 mL at 77.5 °F and 1.00 atmosphere of pressure. What is the balloon's new volume if pressure is decreased to 380 torr at -40.0 °C (1 atm = 760 torr). Original temperature in K = 332.9 Final temperature in K = 313.2 Final pressure in atm = 0.50 Final volume of the balloon in L = 150.5 O Original temperature in K = 355.1 Final temperature in K = 313.2 Final pressure in atm = 0.54 Final volume of the balloon in L = 13.0 O Original temperature in K = 298.4 Final temperature in K = 233.2 Final pressure in atm = 0.54 Final volume of the balloon in L = 11.5 Original temperature in K = 298.4 Final temperature in K = 233.2 Final pressure in atm = 0.50 of the balloon in 1 = 434.1

For each of the following, carry out the mathematical operation and report answers in scientific notation. (a) (3.1 × 10 5) x (2.0 × 10 -²) (b) (7.0 × 10 9) + (2.0 × 10²) (c) (2,8 × 10 -4) + (9,6 × 10 -2) (d) (5,0 x 10 -4)² (e) (8.50 × 10 5) – (3.0 × 10 4) (f) (6.4 × 10 -³) ÷ (4.0 × 10³)

Which statement correctly describes the structure of the atom? the electron cloud accounts for the volume and the negative charge the electron cloud accounts for the volume and the positive charge the nucleus contains particles with both positive and negative charges the nucleus accounts for the volume and the negative charge

A piece of metal was found on the side of the road. The metal was put on a balance and found to have a mass of 79.10 g. The volume was determined by placing the metal into a 27.00 ml column of oil, which was displaced to 34.00 mL. What was the volume of the unknown metal in mL. What was the Density of this metal? What was this metal. Volume = 7.00 ml Density = 11.3 g/mL Metal = lead Volume = 4.00 ml Density = 2.7 g/ml Metal = aluminum Volume = 7.00 ml Density = 19.1 g/ml Metal = uranium Volume = 8.00 ml Density = 7.14 g/ml Metal = zinc

Given the following reaction: CH3COOH + H₂O <==> CH3COO- + H3O+ How would Adding CH3COO and removing H₂O shift the reaction?. This would shift the equilibrium to the right and make the solution more acidic. This would shift the equilibrium to the left and make the solution more acidic. This would shift the equilibrium to the left and make the solution more alkaline. This would shift the equilibrium to the right and make the solution more alkaline.

There are two stable isotopes of boron: boron-10 and boron-11. The atomic weight of boron shown on the Periodic Table is 10.81 amu. Which statement below is correct? boron-10 is the more abundant isotope boron-11 is the less abundant isotope the "average" boron atom has a mass of 10.81 amu the two isotopes are likely to have an equal natural abundance the "average" boron atom has a mass of 10.81 grams

The cleaning action of soaps and detergents is attributable to... their ability to evaporate quickly. their acidic character. their ability to form micelles. their short hydrocarbon tail.

Which equation represents a non-oxidation-reduction process? Fe + 2HCI --> FeCl2 + H₂ Zn(NO3)2 + Na2CO3 --> ZnCO3 + 2NaNO3 C₂H4 + O2 --> CO2 + H₂O Cl₂ + 2NaBr --> 2NaCl + Br₂ More than one response is correct.

The accepted value of the melting point of pure flurbiprofen is 390 K. Trying to verify that value, you obtain 389 K, 391 K, 386 K, and 394 K in four separate trials. Your partner finds 394 K, 394 392 K. Calculate the average value and percent error for your data and your partner's data. Your average value= Your partner's average value= Your percent error = Your partner's percent error =

A 200.0 mL flask at 99°C and a pressure of 733 torr contains 0.970 g of vapor of a substance Z. What is the molar mass of Z in grams per mole? Pay attention to units!

Electron Configuration: Which of the following is Iron (Fe) electron configuration? 1s2, 2s2, 2p6, 3s2, 3p6 1s2, 2s2, 2p6, 3s2,3p6, 3d2 1s2, 2s2, 2p6, 3s2, 3p6, 3d10 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d6

Which of the following is true about all of the molecules named in this way? They all consist of only two elements. The first element is a metal, and the second is a nonmetal. The number of atoms belonging to either element is not reflected in the compound's name. The name of the metal ion gets an -ide suffix added to it. The name of the nonmetal ion gets an -ide suffix added to it.

Which of the following is not one of the three major types of rocks? anthracite igneous sedimentary metamorphic

Metamorphic rocks that have a banded appearance due to the alignment of minerals are called foliated nonfoliated clastic glassy

In a reaction 0.4875 g of FeCl₂ was dissolved in water and reacted with 1.00 ml of 0.0242M silver(I)nitrate (AgNO3). Which is the limiting reagent and what is the theoretical yield of silver(I) chloride (AgCl)? Eqn: 2AgNO3(aq) + FeCl₂taq) → 2AgCl(s) + Fe(NO3)2

Draw the Lewis dot structure for Sr(CN)2. Include all hydrogen atoms and nonbonding electrons. Show the formal charges of all atoms. To change the symbol of an atom, double-click on the atom and enter the letter of the new atom.

The formation of igneous rocks is powered by the sun compaction erosion Earth's internal heat

A fine-grained igneous rock forms deep within Earth from magma as the result of slow cooling as the result of quick cooling

On a topographic map, contour lines that are closer together indicate a forest a steeper slope a mountain top roads

Use the periodic table to give the name or symbol for each of the following elements. The halogen in the same period as the alkali metal with 11 protons The alkaline earth metal in the same period with the neutral noble gas with 18 electrons The noble gas in the same period as gold