Classification of Elements and Periodicity Questions and Answers

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)

Chlorine exists as two naturally occurring isotopes. Cl-35 occurs 75% of the time and Cl-37 occurs 25% of the time. Which of the following calculations is used to correctly calculate the average atomic mass of chlorine? (35 amu x 0.75) + (37 amu x 0.25) (35 amu/2) x (37 amu / 2) (35 amu +37 amu)/2 (35 amu+75) x (37 amu +25)

An aluminum soda can is filled with 10mL of water and heated on a hot plate. When the water is boiling, the can is quickly inverted into a basin of cold water. The can implodes. Explain, in terms of air pressure, why the can imploded. Is this an example of Boyles Law or Charles law?

QUESTION: If these chemicals are mixed nothing appears to happen. Although there are several correct answers listed, you can only select one correct answer. H₂SO₂ and Na₂CO3 HCI and Na₂CO3 H₂SO4 and CaCl₂ MgSO4 and Na₂CO3 H₂SO4 and NaCl HCI and MgSO4 MgSO4 and CaCl₂

You have two tanks, one is 14L and the other is 3L. They are connected by a valve that can open or close. Initially the 12L tank is full of He gas and the 3L tank is completely empty. After opening the valve, what is the volume of the He gas?

Butane reacts with 39.7 grams of oxygen according to the reaction equation shown below. C4H10+O2-> CO₂ + H₂O Calculate the mass of water that is produced if all 39.7 grams of oxygen are consumed during the reaction.

Ethanol reacts with 79.5 grams of oxygen according to the reaction equation shown below. C₂H5OH + O2 → CO2 + H₂O Calculate the mass of carbon dioxide that is produced if all 79.5 grams of oxygen are consumed during the reaction.

Acetylene (C₂H₂) has a molar heat of combustion of -1301.1 kJ/mol. Write a balanced chemical equation for the combustion of acetylene. Then, determine the quantity of energy released in the combustion of 75 grams of acetylene.

S + O₂ -> SO₂ How many moles of oxigen are required to react completely with 7.8 g of sulphur?! ¿Cuántos moles de oxigeno se requieren para reaccionar completa g de azufre?

41 moles of antimony undergoes a synthesis reaction with chlorine gas according to the reaction equation shown below. Sb + Cl2 → SbCl3 Calculate the number of moles of antimony chloride that are produced if all 4.41 moles of antimony are consumed during the reaction.

Aluminum sulfite reacts with sodium hydroxide producing sodium sulfite and aluminum hydroxide. Write the reaction equation, balance, and calculate the number of moles of sodium hydroxide consumed during the reaction if 2.73 moles of aluminum hydroxide are produced.

7.80 grams of ammonium carbonate reacts with 6.63 grams of barium arsenate. Predict the products, write the complete reaction equation, balance, and calculate the mass of the aqueous product.

Part A On the line, write the answer that completes each sentence. 1. The splitting of a large nucleus into smaller ones is called 2. An atom's mass defect is responsible for holding the together. 3. All transuranium elements have a(n) greater than 92. 4. After four half-lives, of an isotope will still remain. The other fraction will have decayed. 5. On the electromagnetic spectrum, rays have the highest energy.

1. Energy due to position or composition 2. Number placed in front of a symbol or formula 3. Number within a chemical formula 4. The substance used up in a chemical reaction 5. Energy due to motion A subscript B coefficient C potential D kinetic E reactant

Convert the following statement into an information question: CCA provides great educational opportunities for ESL students. (What) What does CCA provide for ESL students? What provides CCA for ESL students? What does CCA provides for ESL students? Why does CCA provide great educational opportunities for ESL students?

Convert the following sentence into a negative statement: Barack Obama will return to Hawaii when he leaves the White House. Barack Obama will not return to Hawaii when he leave the White House. Barack Obama will not return to Hawaii when he leaves the White House. Barack Obama do not return to Hawaii when he leaves the White House. Barack Obama does not return to Hawaii when he leaves the White House.

(after) It snows tomorrow. The snow plows will clean the streets. After the snow plows will clean the streets, it snows tomorrow. The snow plows will clean the streets, after it snows tomorrow. After it snows tomorrow the snow plows will clean the streets. After it snows tomorrow, the snow plows will clean the streets.

George was afraid to with the other children, so he hid in the corner until it was time to go home. A) imposition B) advocate C) contribute D) finite E) voluntary F) interact G) mature

Because of several differences in preferences, they gave up on the idea of marketing to both older people and teenagers. A) generational B) site C) consult D) albeit E) linked F) tape G) abandon

Calculate the energy change for the reaction Hint: Use Ionization Table and first Electron Affinity table. A. 124 kJ/mol B. -715 kJ/mol C. 715 kJ/mol D. 1429 kJ/mol

Boron sulfide, B2S3(s), reacts violently with water to form an aqueous solution of boric acid (H3BO3) and hydrogen sulfide gas. Express your answer as a balanced chemical equation. Identify all of the phases in your answer.

Propane C3Hg is a source of fuel for gas barbecues. The Lewis structures showing the reaction for propane combustion is shown and the balanced reaction is also provided. Use the table of bond energies to calculate ΔHrxn

Copper metal reacts with a hot aqueous sulfuric acid solution to form aqueous copper(II) sulfate, sulfur dioxide gas, and liquid water. Express your answer as a balanced chemical equation. Identify all of the phases in your answer.

The electron configurations of two unknown elements X and Y are shown. X: 1s²2s²2p6 Y: 1s22s22p63s23p6 Which statement is most likely correct about the two elements? (1 point) They will not react because both will give up one electron to become stable. They will react because X and Y can share two pairs of electrons to become stable. They will react because X can give up two electrons and Y needs two electrons to become stable. They will not react because both have a complete outermost shell and are stable.

Match the outer electron configuration with the element classification. Choose the best answers. ns²np6 1. reactive metal ns² np5 2. reactive nonmetal ns² 3. metalloid ns²np² 4. unreactive nonmetals

The hydrogen emission spectrum exhibits a line at 2.6630x10-20 J. If the final quantum state is n = 5, what is the initial quantum state of the transition corresponding to this line?

Without doing any detailed calculations (but using a periodic table to give atomic weights), rank the following samples in order of increasing numbers of atoms: 42 g of NaHCO3, 1.5 mol CO2, 6.0 X 10²4 Ne atoms.

A sample of TNT, C₂H5N₂06, has 7.68 1021 nitrogen atoms. How many hydrogen atoms are there in this sample of TNT? Select one: a. 1.28-1022 b. 1.79-1022 c. 10.24 10²1 d. 1.54 1022 e. 7.68 1021

When copper is bombarded with high-energy electrons, X-rays are emitted. Calculate the energy, in joules, associated with the photons if the wavelength of the x-rays is 0.154 nm.

What did Rutherford expect to happen when he aimed particles at the gold foil? Rutherford expected the particles to stop moving after touching the gold foil. Rutherford expected the particles to reflect from the gold foil and return in the opposite direction. Rutherford expected the particles to react with gold atoms forming a new compound Rutherford expected the particles to travel in straight paths through the gold foil. Rutherford expected the particles to be deflected from their straight paths as they passed through the gold foil.

Given that an atom of a semiconductor has a diameter of 2.40 Å, what is the maximum number of moles that fit in the channel of a processor chip that is 67.4 nm long, 85.0 nm, wide and 285 nm thick? Assume that the atoms stack in a simple cubic arrangement. Express your answer numerically in moles.

From this description, identify the physical and chemical properties and if they are intensive or extensive: Zinc melts at 420°C. When zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves. Zinc has a hardness on the Mohs scale of 2.5 and a density of 7.13 g/cm² at 25°C. It reacts slowly with oxygen gas at elevated temperatures to form zinc oxide, ZnO.

Label the particle diagrams below with the letter of one of the following categories. (Categories may be used once, more than once, or not at all): a. Element b. Compound c.Mixture of elements d.Mixture of elements and compounds e. Mixture of compounds

The thermite reaction is used to weld massive metal parts such as the propellers for large ships. How many kilograms of iron(III) oxide (159.7 g/mol) are needed to generate 1.20 x 10^6 kJ of heat? Fe₂O3(s) + Al(s)→ Al₂O3(s) + 2 Fe(s) ΔH = -848 kJ/mol

Work is the capacity to supply heat or do work the process of causing matter to move against an opposing force the energy an object possesses because of its relative position, composition, or condition the energy that an object possesses because of its motion

XeCl4 has an octahedral electron pair geometry, and a square planar molecular shape a square planar electron pair geometry, and an octahedral molecular shape a trigonal bipyramid electron pair geometry, and a seesaw molecular shape a tetrahedral electron pair geometry, and a tetrahedral molecular shape

A cyclotron is a device that can accelerate charged particles to very high velocities, and can be used to generate protons with radiative wavelengths that can kill cancer cells. What is the de Broglie wavelength of a proton (mass 1.673 x 10^-27 kg) that has been accelerated to a velocity of 1.35 x 10^4 m/s? 2.93 x 10^-11 m 5.35 x 10^-3 m 3.41 x 10^10 m 1.67 x 10^-10 m

Greenland Ice Sheet Precipitation (GISP) is a common reference material when making hydrogen isotope measurements. Analysis of GISP shows that it is 0.012624% 2H (mass 2.01410 amu) and the remainder is ¹H (mass 1.00782 amu). What is the average mass of GISP? 1.00795 amu 2.02998 amu 1.00783 amu 1.00789 amu

Which of the following ions have noble gas electron configurations? Check all that apply. Mg+ Sc³+ Ga3+ p3-

Determining Molecular Formulas from Percent Composition Steps 1-3 Assume you have a 100-g sample and determine the amount of each element in 100 g of the compound. Steps 4-5 Find the ratios of amounts of each element to the smallest amount. Step 6 Use the ratios to determine the empirical formula. Step 7 Determine the molar mass of the empirical formula. Step 8 Determine the ratio of the molar masses of the compound and of the empirical formula. This ratio is the number of empirical formula units in the molecule. Step 9 Multiply the number of atoms of each element in the empirical formula units by the ratio found in the preceding step. An organic acid is composed of carbon (68.84%), hydrogen (4.96%), and oxygen (26.20%). Its molar mass is 122.12 g/mol. Determine the molecular formula of the compound.

When using magnetic marbles to represent bonding atoms, what represents the "system"? The stationary marble The ruler The collision between the marbles The force of attraction between the marbles The moving marble

A chemist prepares a solution of sodium hyposulfate (Na2S2O3) by weighing out 42.9 kg of sodium hyposulfate into a 100. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in g/L of the chemist's sodium hyposulfate solution. Round your answer to 3 significant digits.

In the laboratory you are given the task of separating Ag+ and Co2+ ions in aqueous solution. For each reagent listed below indicate if it can be used to separate the ions. Type "Y" for yes or "N" for no. If the reagent CAN be used to separate the ions, give the formula of the precipitate. If it cannot, type "No"

What does the following equation represent? Ca5(PO4)3OH -----> 5 Ca²+ + 3 PO4³-+ OH* the production of calcium ions in milk. the production of phosphate in soft drinks. the formation of base (OH-) in cheese production. coral formation. the loss of bone material. None of these options is correct.

The transition metal complex(es) with zero magnetic moment, zero dipole moment and CFSE of -2.4 Δ0 is(are) (I) [Mn(CO)5(CH3)] (II) [trans-Ni(ethylene diamine)2Cl2] (III) [trans-Co(CN)4(NH3)2]- (IV) [trans-Fe(CN)4(CO)2]2- II, III III, IV I, III II, III, IV

Which of the following aspects of fructose activity in the body is correct? Since fructose is a sugar, it is metabolized in the same way as is glucose. Fructose is processed by the liver to make carbon monoxide and water. None of these options is correct. Fructose is processed by the liver to make fat. Fructose is not involved with the promotion of Advanced Glycation End products. Fructose can not be digested by humans because they lack the enzyme to break it down.

Classify the following as a mixture or pure substance. a The vegetable soup you had for lunch. mixture pure substance b The salt you sprinkle on your French fries. Omixture pure substance C The fertilizer your dad spreads on the front lawn in the spring. mixture pure substance d The hydrogen peroxide you cleaned a cut finger with. mixture pure substance

Atomic Structure 2: Electronic Structure:Question 6 Which statement describes patterns in how nonmetals in groups 16 and 17 behave when forming ions? Nonmetals in groups 16 and 17 tend not to lose or gain any electrons. Nonmetals in groups 16 and 17 tend to first lose and then gain electrons. Nonmetals in groups 16 and 17 tend to gain electrons. Nonmetals in groups 16 and 17 tend to lose electrons.

Sodium carbonate is used in the manufacture of paper. What is the chemical formula for this compound? Express your answer as a chemical formula.

If a box has the dimensions 2.45cm x 5.98cm x 4.11cm, what is the volume of the box in in³? 2.74in³ 3.67in³ 13.9in³ 0.498in³