Inorganic Chemistry Questions

A gas has a volume of 1400 milliliters at a temperature of 20 K and a pressure of 1.0 atm. What will be the new volume, in mL, when the temperature is changed to 40 K and the pressure is changed to 0.50 atm?

Sometimes sea shells can be found in strange places. Like deserts and on mountains. Other than plate boundaries moving what is another reason for this? A)The earth's tilt on its axis has changed over the years and the equator use to be farther south B)Plate boundary movement is the only correct explanation for marine fossils in strange places C)Sea levels use to be much lower D)The sea levels use to be much higher and covered most of the land on earth. So marine fossils are found inplaces far from water

Which of the following are transuranium elements? Choose all that apply. At Cf Bh Ba V

When the nuclide polonium-210 decays to lead-206, what kind of decay does polonium-210 undergo? (Select all that apply.) positron emission electron capture alpha decay beta decay

An ion from a given element has 15 protons and 18 electrons. What is the charge on the ion? What is the name of the element? What is the symbol for the ion?

The narration is about Chillingworth, the husband of Hester Prynne. "When he found the eyes of Hester Prynne fastened on his own, and saw that she appeared to recognize him, he slowly and calmly raised his finger, made a gesture with it in the air, and laid it on his lips." What can be inferred from the given lines? Hester Prynne and Chillingworth have legally separated. Chillingworth expresses his anger on Hester Prynne for her adultery. Chillingworth gestures to a man in the crowd to punish Hester for her adultery. Hester Identifies Chillingworth in the crowd and abides by his command.

Consider the ions Na and I. How many protons and electrons does each of these ions possess? protons in Na electrons in Na protons in I electrons in I

Paper clips are made of iron. If the average paper clip weighs 2 grams, how much does a mole of iron weigh? How many paper clips would be needed for a mole of iron?

a. Fr-218 decays by alpha decay. What are the atomic symbol and mass number of the product? Product: b. At-209 decays by alpha decay. What are the atomic symbol and mass number of the product? Product: c. Be-7 decays by gamma emission. What are the atomic symbol and mass number of the product? Product: d. Cu-67 decays by beta decay. What are the atomic symbol and mass number of the product? Product:

Bi undergoes four decay reactions: B, a, B. B. Step 1. 214Bi undergoes ß decay to give 214Po In the second step, Po-214 undergoes a decay. What is the product of this step? symbol = mass number = atomic number =

Which of the following electron configurations is correct? Br: [Kr]4s²3d¹⁰4p⁷ Ca: [Ar]4s¹3d¹⁰ Mo: [Kr]5s²4d⁵ Ga: [Kr]4s²3d¹⁰4p¹ Br: [Xe]6s² 4f¹⁴5d¹⁰6p³

Imagine you are in a laboratory. You are exploring the following reaction: A+B -->C When the product C is created, bubbles form. When 10mL of A is added to 10mL of B, the reaction takes twenty seconds. Your teacher gives you three unknown substances (X, Y, and Z), one of which is a catalyst for the reaction. Design an experiment to test substances X, Y, and Z to determine which one is a catalyst for the reaction.

2LiBr + 12 -- 2Lil + Br2 Calculate the mass of bromine produced when 9.033 x 1023 particles of iodine (l2) react completely. Use the periodic table to get the weights of the elements. Express your answer to the correct number of significant figures. The mass of the Br2 is ____ grams.

A 2.01-g sample of potassium chlorate was decomposed according to the following equation: 2KClO₃ → 2KCl+3O₂ How many moles of oxygen are formed? 0.0109 mol 0.79 g 0.0246 mol 0.0164 mol None of these choices are correct.

The moral that the story teaches us is a) Do not wear new clothing to parties b) Do not lie to others; you will be found out c) Do not aspire for more than you have; it will ruin you d) Do not wear expensive jewelry to parties

4.8 g of sulfur and 5.4 g of aluminum react based on the chemical equation below and 4.5 g of aluminum sulfide (Al₂S₃) are recovered from the reaction, a small amount cannot be recovered. 3S + 2A1 → Al₂S₃ Determine the percent yield of Al2S3- (Molar mass of S = 32.06g/mol, molar mass of Al = 26.98 g/mol)

1. The element aluminum forms a_______ with the charge________ . 2. The symbol for this ion is _______ and the name is _________ ion. 3. The number of electrons in this ion is _______.

A student performing this experiment forgot to add phenolphthalein solution to the vinegar solution before beginning the titration. After adding 27 mL of NaOH solution, he realized his error and added the indicator. The solution turned bright pink. Suggest a procedure the student could follow to salvage the titration.

Example Solute Solvent Solution 1. Fruit-flavored drink (25 g flavoring powder ---------- ------------ -------- in 1000 g water). 2. Simple syrup(450g sugar -------- ------------ -------- in 550g water) 3. Medical saline (4 g salt in ---------- ------------ ------- 100 g water)

The Pauli Exclusion Principle tells us that no two electrons in an atom can have the same four quantum numbers. For an electron in the 3p orbital shown above, enter a possible value for each quantum number. n = ▭ l = ▭ m₁= ▭ Give ONE example m₀ = ▭ Give ONE example Though a given electron only has one value for m₁, there are ▭ possible m₁ values for electrons in 3p orbitals.

The formula for the conjugate acid of C6H6O6^2- is ________ The formula for the conjugate acid of HPO4^2- is __________

Dr. Raisa and her team of geologists have been studying GPS data that shows that two plates moved apart. Which diagram shows what happened between the two plates as they moved away from each other? (a) Diagram A: A new plate from underneath filled in the gap that was created by the plates moving apart. (b) Diagram B: Sand and dirt filled in the gap that was created by the plates moving apart. (c) Diagram C: Ocean water filled in the gap that was created by the plates moving apart. (d) Diagram D: Soft, solid rock from underneath the plates rose and hardened, adding solid rock to the edges both plates.

What is the valence electron configuration for the beryllium atom? What is the valence electron configuration for the nitrogen atom?

What is the name of the element with a valence electron configuration of 4s²4p³? What is the name of the element with a valence electron configuration of 3s²3p⁴?

Which of the following statements about the benefits of phosphates as active components of biochemistry are true? Select one or more: a. Phosphate are kinetically stable b. Their negative charges protect from nucleophilic attacks c. Phosphates are thermodynamically unstable d. Removal of a phosphate has a highly positive free energy change associated with it e. Phosphates are non-polar

Consider the following four cases i. A chemical process in which heat is absorbed. ii. A change in which q = 30 J, w = 44 J. iii A process in which a system does work on its surroundings with no change in q. iv. A process in which work is done on a system and an equal amount of heat is withdrawn. In how many of these cases does the internal energy of the system decrease? 0 1 2 3 4

For the following statements (1) Cast iron is purest form of commercial iron (2) The temperature in reduction of zinc oxide (using coke) is higher than Copper oxide (3) Copper is used for galvanising iron (4) The metal which is liquid at room temperature is refined by zone refining Choose the correct sequence where I represents true and F represent false. TTFT TTFF FTFF TFTT

Write the balanced chemical equation for each of the reactions. Include phases. When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms. However, when additional aqueous hydroxide is added, the precipitate redissolves, forming a soluble [Pb(OH)4]²-(aq.) complex ion.

Looking at the same nonmetal group on the periodic table, how does the reactivity of an element in period 2 compare to the reactivity of an element in period 4? The period 2 element would be more reactive because the attractive force of protons is stronger when there are fewer neutrons interfering. The period 2 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a closer electron shell. The period 4 element would be more reactive because the attractive force of protons is stronger when there are more neutrons helping The period 4 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a farther electron shell.

What is Heisenberg's uncertainty principle? Electrons travel in discrete orbitals around the nucleus. It is impossible to know the exact position and speed of an electron at a given time. It is impossible to predict the spin of a moving electron. Electrons are negatively charged and nuclei are positively charged.

At a certain temperature, 0.4211 mol of N, and 1.541 mol of H, are placed in a 5.00 L container. N₂(g) + 3H₂ ⥨ 2NH3(g) At equilibrium, 0.1401 mol of N, is present. Calculate the equilibrium constant, Kc.

Which of the following correctly describes a sigma bond? a double bond a triple bond a bond formed when the nodes of two orbitals overlap a bond formed when two orbitals overlap end to end

XeFn+ mH2→ A(Contain Xe) + Other Products Regarding above reaction, which of the following option is correct : When n = 6 and m = 2, the hybridisation of Xe in A is sp^3d^2. When n = 2 and m = 1, then other products has a diatomic colored gas. When n = 6 and m = 3, then Electron pair structure of A is tetrahedral. When n = 6 and m = 1, the hybridisation of Xe in A is sp^3d.

A chemist mixes 22.6 g of ethanol with 7.47 g of acetone and 89.1 g of 1-bromobutane. Calculate the percent by mass of each component of this solution. Round each of your answers to 3 significant digits.

At 25 °C, an aqueous solution has an equilibrium concentration of 0.00237 M for a generic cation, A²⁺ (aq), and 0.00474 M for a generic anion, B‾(aq). What is the equilibrium constant, Ksp, of the generic salt AB₂ (s)?

A scuba diver's oxygen tank is filled in a room which is at 23.0 C. It is then submerged in a tank of cold water to test where they are leaking. If the original pressure inside the tank was 20.00 atm and the pressure in the water is 19.25 atm, what is the temperature of the water?

Which of the following factors explains why H2O is a polar molecule? the presence of two non-bonding pairs of electrons the presence of two hydrogen atoms the presence of two bonding pairs of electrons an asymmetrical distribution of charge

It is not considered safe to put a whipped cream container into a fire because the pressure will increase and cause an explosion. If a whipped cream container at 0.0 C is put into a campfire and its temperature is raised to 500. C, what was the initial pressure in the container if the final pressure is 29 atmospheres?

As you have seen, lead can form the same kinds of compounds as the alkaline earth metals, Nevertheless, the solubility values may differ markedly, Give a convincing reason based on the electron configurations of the metal ions.

Which of the following describes the element Rb. Choose all that apply. is very reactive as a metal. forms basic solution in water. consists of diatomic molecules in elemental form. is one of the group of the least reactive elements. reacts vigorously with alkali metals to form salts. is found in nature only combined with the other elements.

The atomic radii in picometers of F, Br, and I are shown in the table below. 9 F 64 pm 17 CI ? pm 35 Br 114 pm 53 I 138 pm Using this information, predict which of the following best represents the most reasonable atomic radius of Cl.

3. Draw the chemical structure of a single lipid composed of myristic, palmitic and linoleic acids and glycerol. Label the different parts of the molecule.

SO3 has several resonance structures. Consider one of these structures in which all the atoms follow the octet rule. For this particular resonance structure, which of the following statements is (are) true? Select all that apply to get full credit. The molecular geometry or shape of SO3 is trigonal planar. There is one set of lone pair on the central sulfur atom. The central sulfur atom forms 2 double bonds with the oxygen atoms. The central sulfur atom forms 3 single bonds with oxygen atoms.

Which of the following describes the element I? a. consists of diatomic molecules in elemental form b. reacts vigorously with alkali metals to form salts c. forms a basic solution in water d. is one of the group of the least reactive elements e. belongs to a group consisting entirely of gases f. is very reactive as a metal

Which of the following describes the element F? (A) belongs to a group consisting entirely of gases (B) is one of the group of the least reactive elements (C) forms a basic solution in water (D) is very reactive as a metal (E) consists of diatomic molecules in elemental form (F) reacts vigorously with alkali metals to form salts

Which of the following describes the element Ba. a. forms a basic solution in water b. consists of diatomic molecules in elemental form c. is one of the group of the least reactive elements d. is found in nature only combined with other elements e. is very reactive as a metal f. reacts vigorously with alkali metals to form salts

What is the conjugate acid in the following equation? OH¯ + HCN → H2O + CN¯ (A) CN¯ (B) H₂O (C) HCN (D) OH¯

Whether or not the process is observed in nature, which of the following could account for the transformation of magnesium-20 to sodium-20? (Select all that apply.) alpha decay positron emission beta decay electron capture

A 10.0 g sample of powder was found to contain 1.36 g lithium, 2.36 g carbon and 6.28 g oxygen. The molecular weight of the compound is 101.898 g/mol. Determine the empirical and molecular formula.

Iron (III) iodide reacts with bromine to produce iodine and iron (III) bromide. 2 Fel3 + 3Br₂ → 3I₂ + 2FeBr a. If 218 g of iron (III) iodide reacts with 90.0 g of bromine, which is the limiting reactant, and which is the excess reactant? (2) b. What mass of iodine would be obtained? (1) c. What mass of the excess reactant remains after the reaction is complete? (2) d. If the reaction yield 115 g of iodine determine the percent yield. (1)