General Questions and Answers

American football is played on a 100 yd long field, excluding the end zones. What is the length L of the field in meters? Assume that 1 m equals 3.281 ft.

Convert a speed of 197 mi/h to units of feet per minute. Also, show the unit analysis by dragging components into the unit-factor slots.

Convert a speed of 363 cm/s to units of inches per minute. Also, show the unit analysis by dragging components into the unit-factor slots.

Summarize the general direction of each periodic trend for the main group elements: How does atomic size vary in a group and a period? How does electronegativity vary in a group and a period? How does ionization energy vary in a group and a period?

Given the following reaction: 2MnO4 + 5H₂O₂ + 6H50₂ + 2Mn²+ + 8H₂O If 36.44 mL of a 0.01652 M MnO4 solution are required to completely react with 25.00 mL of H₂O₂ solution, what is the concentration of the H₂O₂ solution?

calcium and chlorine Enter the ions formed by these elements and separate your answers with a comma (e.g., Sr²+, As³-).

The elements in groups 1A, 6A, and 7A are called a. Alkaline earth metals, halogens, and chalcogens b. Alkali metals, chalcogens, and halogens c. Alkali metals, halogens, and noble gases d. Alkaline earth metals, transition metals, and halogens respectively.

A scholar is given a sample of CUSO,(s) that contains a solid impurity that is soluble and colorless. The scholar wants to determine the amount of CuSO, in the sample and does so using an analytical technique called spectrophotometry. a. Identify the name and type of compound (ionic, metallic, covalent) the scholar is given. b. There are two properties of the solid impurity that are discussed in question 2. What are the properties? Identify them as physical or chemical properties.

A chemist uses an experiment similar to experiment 2.2 to decompose 150.0 grams of water (H₂O). If he finds that he makes 16.7 grams of hydrogen from the decomposition, how much oxygen must he have produced?

Dihydrogen monoxide (H₂O) is the main component of acid rain. How many grams of dihydrogen monoxide are in 15.7 moles?

Magnesium hydroxide (Mg(OH)₂) is commonly found in antacids. If a single dose of magnesium hydroxide is 15 grams, how many moles of magnesium hydroxide are in a single dose?

If one mole of carbon (C) contains 6.02 x 1023 atoms of carbon; how many atoms of carbon dioxide (CO₂) does one mole of carbon dioxide contain? 6.02 x 1023 atoms of CO2 3.01 x 1023 atoms of CO₂ 6.02 x 1069 atoms of CO2 1.806 x 1024 atoms of CO₂ 6.02 x 1024 atoms of CO₂

Complete the following sentence choosing the right option from the list below. Articles used in the research journal is called primary sources secondary sources quaternary sources

Which of the following is an example of parallel structure? I don't know what to do or whom to meet. Children like books that have colorful illustrations. After I reached home, I turned on the television to watch the news.

How many moles of nitrogen gas would be produced if 3.40 moles of copper(II)oxide were reacted with excess ammonia in the following chemical reaction? 2 NH3(g) + 3 CuO (s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)

Write the balanced COMPLETE ionic equation for the reaction when calcium acetate and potassium sulfide are mixed in aqueous solution. If no reaction occurs, simply write only NR.

How many liters of a 0.209 M KI solution is needed to completely react with 2.43 g of Cu(NO3)2 according to the balanced chemical reaction: 2 Cu(NO3)2(aq) + 4 Kl(aq)→ 2 Cul(aq) + 1₂(s) + 4KNO3(aq)

An unknown solution gives a violet flame test, but no reaction with ammonium carbonate, ammonium phosphate, and ammonium sulfate. The halide test produces a purple color in the upper hexane layer. Identify (a) the alkali or alkaline earth element, and (b) the halide present in the unknown solution.

Identify the correctly punctuated sentence from the following: When Claire saw the beautiful lake: by the cabin, she became ecstatic. When Claire saw the beautiful lake by the cabin, she became ecstatic. When Claire saw the beautiful lake; by the cabin she became ecstatic.

Which one of the following correctly ranks the compounds in order of lowest enthalpy of vaporization to highest enthalpy of vaporization based only in intermolecular forces? A) CH3NH₂ < CH3SH < CH3CH3 B) CH3NH₂ < CH3CH3 < CH3SH C) CH3CH3 CH3SH < CH3NH2 D) CH SH< CH3NH2 < CH3 CH3

A major component of gasoline is octane (C8H18). When octane is burned in air, it chemically reacts with oxygen gas (0₂) to produce carbon dioxide (CO₂) and water (H₂O). What mass of oxygen gas is consumed by the reaction of 7.72 g of octane? Be sure your answer has the correct number of significant digits.

Which of the following might be best described by the following set of properties? 1. white solid melting at 772 °C 2. solid does not conduct electricity 3. solid dissolves in water to form a conducting solution A) BN B) P4S3 C) Pb D) CaCl₂ E) Cannot be determined.

Refer to the periodic table on the inside front cover of this lab manual. Which two elements in the fifth period violate the original periodic law stated by Mendeleev?

A sample of B weighs 47.6 grams. Will a sample of Ne that contains the same number of atoms weigh more or less than 47.6 grams? (more, less): Calculate the mass of a sample of Ne that contains the same number of atoms.

Ammonium phosphate ((NH4)2PO4) is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H₂PO4) with ammonia (NH3). What mass of ammonium phosphate is produced by the reaction of 1.21 g of phosphoric acid? Be sure your answer has the correct number of significant digits.

9. Refer to the periodic table on the inside front cover of this lab manual. Select the symbol of the element that corresponds to the following description. (a) the nonmetal in Group IA/1 (b) the metal in Period 2, Group IA/1 (c) the semimetal in Period 4, Group IVA/14 (d) the representative element in Period 3 with three valence electrons (e) the transition element in Period 4, Group IVB/4 (f) the alkali metal in Period 3 (g) the alkaline earth metal in Period 4 (h) the halogen in Period 3 (i) the noble gas in Period 4 (j) the radioactive element in Period 5 (k) the highest atomic number lanthanide (1) the highest atomic number actinide (m) the element with atomic number 26 (n) the radioactive element with mass number 226 (o) the element with atomic mass 107.87 amu

Suppose you measured the physical distance between a points at 30 degrees N, with the same longitudinal components, and points at 60 degrees N, which also with the same longitudinal components as the points at 30 degrees N. Which would constitute a longer physical distance, the distance between points at 30 degrees N, or 60 degrees N?

Which style of writing will you follow to respond to the following prompt? What should humans do to reduce the level of carbon-di-oxide in the atmosphere? Compare and contrast. Cause and effect Problem-solution

An organic compound, frequently used in perfume industry, contains 11.264 g of carbon, 0.945 g of hydrogen, and 3.750 g of oxygen in a 15.959 g sample. The molar mass of the compound is 130 g/mol. Find both the empirical formula and the molecular formula of this compound.

What are the precise words used in the following sentence from "Among the Ice Floes" by J. Fenimore Cooper? "As the wind was now ahead, both vessels drove rapidly ahead; and in half an hour the northern point of the land was reached." Half an hour Drove rapidly Northern point

Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. The steps of the experiment are listed below. 1. Select different locations to collect water samples in the pond. 2. Collect a 5-mL water sample at 8 am at a different location each day for 10 days. 3. Measure the amount of pesticide present in each sample using the same measurement tools. After analyzing their data, the students conclude that pesticide runoff from farms is not causing the fish to die in the pond. Which of these statements best describes why their conclusion is not valid? (2 points) The amount of water collected each day was the independent variable. The daily location for sample collection was not a controlled variable. Pesticide measurements were the dependent variable. The time of sample collection was not a controlled variable.

(a) Approximately how long would it take a telephone signal to travel 2690 mi from coast to coast across the United States? (Telephone signals travel at about the speed of light.) (b) Approximately how long would it take a radio signal to reach the International Space Station (ISS) at an orbital altitude of 350 km?

Identify the kind of conclusion. The magi, as you know, were wise men - wonderfully wise men - who brought gifts to the Babe in the manger. They invented the art of giving Christmas presents. Being wise, their gifts were no doubt wise ones, possibly bearing the privilege of exchange in case of duplication. And here I have lamely related to you the uneventful chronicle of two foolish children in a flat who most unwisely sacrificed for each other the greatest treasures of their house. But in a last word to the wise of these days let it be said that of all who give gifts these two were the wisest. Of all who give and receive gifts, such as they are wisest. Everywhere they are wisest. They are the magi. (The Gift of the Magi by O. Henry) Question Strong statement Summary

Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to the reaction BaO₂ (s) + H₂SO4 (aq) → BaSO4(s) + H₂O₂ (aq) How many milliliters of 5.00 M H₂SO4 (aq) are needed to react completely with 89.1 g BaO₂ (s)?

Using the listed equalities, convert the following numbers to different units. Make sure that you have the correct number of significant figures. (6 points per answer, 12 points total) Show your work for partial credit.

What is the period of the wave motion for a wave with a frequency of 0.44 kHz?

The reform reaction between steam and gaseous methane (CH4) produces "synthesis gas," a mixture of carbon monoxide gas and dihydrogen gas. Synthesis gas is one of the most widely used industrial chemicals, and is the major industrial source of hydrogen. Suppose a chemical engineer studying a new catalyst for the reform reaction finds that 917. liters per second of methane are consumed when the reaction is run at 257. °C and the methane is supplied at 0.89 atm. Calculate the rate at which dihydrogen is being produced. Give your answer in kilograms per second. Round your answer to 2 significant digits.

Two ice skaters stand together as illustrated in Figure (a) below. They "push off" and travel directly away from each other, the boy with a velocity of v= 0.330 m/s to the left. If the boy weighs 730 N and the girl weighs 462 N, what is the girl's velocity (in m/s) after they push off? (Consider the ice to be frictionless.)

Identify the kind of conclusion used in the selection. When they had eaten and drunk, and were very merry, the old king told all the story, as one that he had once heard of, and asked the true waiting-maid what she thought ought to be done to anyone who would behave thus. "Nothing better," said this false bride, "than that she should be thrown into a cask stuck around with sharp nails, and that two white horses should be put to it, and should drag it from street to street till she is dead." "Thou art she!" said the old king; "and since thou hast judged thyself, it shall be so done to thee." Then the young king was married to his true wife, and they reigned over the kingdom in peace and happiness all their lives. Happy ending Sad ending Open-ended

A comet goes around the sun in an elliptical orbit. At its farthest point, 570 million miles from the sun, it is traveling with a speed of 15,225 mi/h. How fast is it traveling at its closest approach to the sun, at a distance of 142 million miles?

Taking the density of air to be 1.29 kg/m³, what is the magnitude of the linear momentum of a cubic meter of air moving with the following wind speeds?

Can you recognize the chemical and physical changes that happen all around us? If you change the way something looks, but haven't made a new substance, a physical change (P) has occurred. If the substance has been changes into another substance, a chemical change (C) has occurred. 1.An ice cube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone. 2.Two chemical are mixed together and a gas is produce. 3.A bicycle changes color as it rusts. A solid is crushed to a powder. Two substances are mixed and light is produced. A piece of ice melts and reacts with sodium. Mixing salt and pepper. Chocolate syrup is dissolved in milk. A marshmallow is toasted over a campfire. A marshmallow is cut in half.

Automobile airbags inflate due to the formation of nitrogen gas from the chemical reaction 2 NaN3 (s) -> 3 N₂(g) + 2 Na(s) Identify the number of each atom in the reactants and products for this balanced reaction. Identify the number of Na atoms in the reactants and products. Identify the number of N atoms in the reactants and products.

Water has a known density of 0.997 g/mL at room temperature. Calculate the percent error in the determined density. Use the density determined graphically for this calculation.

Write the net ionic equation, including phases, that corresponds to the reaction Cu(CIO)₂(aq) + Na₂CO3(aq) → CuCO₂ (s) + 2 NaClO4 (aq)

Assuming an efficiency of 37.60%, calculate the actual yield of magnesium nitrate formed from 113.7 g of magnesium and excess copper(II) nitrate. Mg + Cu(NO3)2 Mg(NO3)2 + Cu

The reaction for producing glucose in plants, called photosynthesis, is light 6CO₂ + 6H₂O → C6H12O6 +6O2 If a plant produces 7.01 mol C6H12O6, how many moles of H₂O are needed?

Select the correct conversion factors based on the information in the following statement: One gallon of milk costs $3.50.

When heated, KCIO3 decomposes into KCl and 0₂. 2 KClO3 →2 KCl +30₂ If this reaction produced 44.6 g KCl, how many grams of O₂ were produced?

What is the name of the following ionic molecule: Mg3(PO4)2? Magnesium diphosphate Magnesium phosphate tetraoxide Trimagnesium phosphate Magnesium phosphate Trimagnesium diphosphate