Practical Detection Questions and Answers

These words are spoken by Hester to Dimmesdale when the townspeople wanted to separate Hester and her child. "Speak thou for me!' cried she. Thou wast my pastor, and hadst charge of my soul, and knowest me better than these men can. I will not lose the child! Speak to me! Thou knowest, for thou hast sympathies which these men lack! - thou knowest what is in my heart, and what are a mother's rights, and how much the stronger they are when that mother has but her child and the scarlet letter! Look thou to it! I will not lose the child! Look to it!" Which among the following lines/phrase thát Hester speaks to convey a subtle message to Dimmesdale? "Speak thou for meľ' cried she." "Thou knowest, - for thou hast sympathies which these men lack!" 'Thou knowest what is in my heart" "How much the stronger they are, when that mother has but her child and the scarlet letter!"

Points 2 The dominant intellectual movement of the Renaissance was called Romanticism Feudalism Humanism Classicism

Classify the characteristics that make up the Estampie Dance, secular, non-religious Dance, sacred, non-religious Dance, secular, religious Dance, sacred, religious

Air is a mixture of nitrogen, oxygen, and argon (and a few other trace gases that we will ignore here). Assume you have a container of air, where nitrogen has a partial pressure of 761 torr, oxygen has a partial pressure of 226 torr, and argon has a partial pressure of 37 torr. What is the total pressure in the container? Your Answer:

A sample of calcium carbonate [CaCO3 (s)] absorbs 40.3 J of heat, upon which the temperature of the sample increases from 20.8 °C to 27.3 °C. If the specific heat of calcium carbonate is 0.82 J/g- K, what is the mass (in grams) of the sample? -7.6 7.6 5.1 5.3 0.13

Calculate the work done in kJ during a reaction in which the internal volume contracts from 48 L to 19 L against an outside pressure of 2.5 atm. (1 L-atm = 101.3 J) -7300 7.3 7300 0, no work is done. -7.3

Nicholas reveals his aunt's manipulation when he brings u.. the strawberry jam incident and concludes, "Oh, Devil, you have sold yourself!" (Saki 5). A. Passage #1 B. Passage #2 C. Passage #3 D. Passage #4

In the chunked method, you ca 6 sometimes put a bit of evidence into your explanation. Which is an example of explanation that contains a bit of evidence? A. The only winner, it seems, are the wolves, who work in unison... B. The men fight over a land "where the trees can't even stand upright in a breath of wind" (Saki 5)... C. In this story, everything is ironic.

From the topic sentence in the 5 sample paragraph, Saki's use or which literary device or technique is being addressed? A. characterization B. irony C. dialogue

Using the alternating method, 7 where does the following explanation belong in the outline of Body Paragraph 2? The wolves symbolize both the power of nature and its disregard for men or their concerns. A. Explanation 1 B. Explanation 2 C. Explanation 3

From the sample conclusion paragraph, which passage is a Paraphrase of the text/story? A. In "The Lady, or the Tiger" Stockton B. The story is about a princess who must choose whether she would prefer to see her lover die... C. It is clear that Stockton uses symbolism throughout the story; the tiger represents jealousy... D. Stockton...thematically suggests that love never ends well no matter what the circumstances

According to the following balanced chemical reaction: 2 Cr(s) + 2 H3PO4 (aq) + 3 H₂ (g) + 2 CrPO4 - What mass (in grams) of H₂ Las is produced when 48.3 grams of phosphoric acid are reacted with excess chromium?

Which statement is true about how scientists draw conclusions from data? A. Scientists do not allow others to make conclusions about their data. B. Two scientists may have different underlying assumptions that lead them to different conclusions about the same data. C. Any two scientists will always come to the same conclusion about a data set. D. Teams of scientists never share their data to help other teams draw conclusions.

How does the phase of water affect its specific heat capacity? A. Water vapor has the highest specific heat capacity. B. All phases have the same specific heat capacity. C. Frozen water has the highest specific heat capacity. D. Liquid water has the highest specific heat capacity.

Calculate the number of carbon atoms in a 140.0 g sample of camphor (C₁0H160). Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

According to the following balanced chemical reaction: CH4(g) + 2 O₂(g) - CO₂(g) + 2 H₂O(l) 4 What mass (in grams) of CO₂ is produced when 56.5 grams of oxygen are reacted with excess CH4? Your Answer: Answer units

The density of iron is 7.874.Convert to kilogram per cubic meter. Do not include units in your answer. Provide your answer below:

Predict the products of the reaction below. That is, complete the right-hand side of the chemical equation. Be sure your equation is balanced and contains state symbols after every reactant and product. HCIO3(aq) + H2o ⇒ _

Identify areason that chemical reactions release energy during the reaction process. Select one: a. forming bonds b. breaking bonds c. storing energy d. overcoming activation energy

Be sure to answer all parts. Running at a rate of 7 mi/h uses 812 Calories in an hour. Convert this value to (a) J/h and (b) kJ/h. Report answers to appropriate number of significant figures.

What is the net ionic equation of the reaction of ZnCl2 with NaOH? Express you answer as a chemical equation including phases.

Be sure to answer all parts. This question has two parts. Consider a 100. g sample of water. The specific heat of water is 1.00 cal/g °C) or 4.18 J/(g · °C). Part 1 out of 2 (a) How much energy, in calories, is released as the water is cooled from 55.0°C to 12.0°C? (Enter your answer in scientific notation.) Energy released = _ x 10 _ cal

According to the definitions given, which is the correct use of the word novel as an adjective? A. Wyatt came up with the novel idea of having a talk show just for students. B. This book about Abraham Lincoln is a very interesting novel. C. Something that everyone already knows or is doing is called novel.

Questions (Answer in complete, full sentences. Limit yourself to the available space.) 1. Using your knowledge of this reaction, sketch an energy profile diagram for the reaction. In your diagram, clearly label the axes, structures of reactants, structures of products, activation energy (E₂), transition state structure, and AH.

For scuba dives below 150 ft, helium is often used to replace nitrogen in the scuba tank. If 14.7 g of He(g) and 28.0 g of O₂(g) are added to a previously evacuated 5.35 L tank at 20.°C, calculate the partial pressure of each gas present as well as the total pressure in the tank. Partial pressure of He Partial pressure of 02 Total pressure = atm atm atm

Why does Hess's law allow you to determine the enthalpy change of a reaction? A. It states how the equilibrium constant is related to the enthalpy change. B. It states that the change in enthalpy depends on the reaction pathway between the products and the reactants. C. It states that the change in enthalpy is independent of the pathway the reaction takes to get to the products. D. It states that the enthalpy of any reaction can be determined using a bomb calorimeter.

A box has volume of 4.75 x 1018 μm³ (cubic micrometers). What is the volume of the box in cubic feet (ft³)? 2.54 cm = 1.00 inch; 12.00 inches = 1.00 foot 1.68 x 1011 ft³ 1.55 x 1013 ft³ 2.87 × 1017 ft³ O 1.87 × 106 ft³ 168 ft³

A sample of neon gas at 302 K and 0.565 atm occupies a volume of 4.91 L. If the pressure of the gas is decreased, while at the same time it is heated to a higher temperature, the final gas volume will be larger than 4.91 L. could be larger or smaller than 4.91 L depending on the final pressure and temperature. will be smaller than 4.91 L.

You would like to make a solution that 38.8 L of a 2.9 M solution. You have a stock solution that is 9 M. How much your stock solution will you need to dilute to get the solution you want? Just the number!

According to Le Châtelier's principle, how would a change in pressure affect a gaseous system in equilibrium? A. The equilibrium would shift to reduce the pressure change. B. The number of both reactants and products would increase. C. The equilibrium would shift in the direction of the change. D. All equilibrium interactions would stop.

You work at a factory that produces ammonia gas. The reaction gives off heat. If the reaction is at equilibrium, how can you force the reaction to produce more products? Please choose the correct answer. Increase the temperature. Decrease the temperature. Changing the temperature has no effect.

Which of the statements below are true? A. Round bottom flasks always have 14/20 glass joints B. Round bottom flasks usually are equipped with male joints C. When greasing glassware, you should always grease the joint of the round bottom flask D. Round bottom flasks are only used to heat the reaction mixtures E. Round bottom flasks are usually equipped with female joints F. Round bottom flasks should be filled just to 1/3 of the volume.

Barium can be analyzed by precipitating it as BaSO4 and determining the mass of the precipitate. When a 0.269-g sample of a barium compound was treated with excess H₂SO4, 0.0891 g of BaSO4 formed. What percentage of barium is in the compound?

4 The black "tarnish" that can develop on silver objects is a result of the metal reacting with sulfur-containing compounds in the air to produce silver sulfide. A sample of silver sulfide was found to contain 90.64 g of silver and 13.47 g of sulfur. Use these data to calculate the empirical formula of silver sulfide.

You analyzed 2.475 g of a mixture of NaCl, SiO₂, and CaCO. You isolate 0.825 g NaCl, 0.825 g of CaCO3, and 0.580 g SiO₂. You were told that the original mixture contained 35% NaCl, 45% CaCO3, and 20% SiO₂. Report two possible sources of error.

You time travel 100 years into the future and learn that several new elements have been discovered, as pictured. These elements are frequently found as oxides, and need to be separated in order to extract the pure element. Before going through this effort, it is useful to know what amount of the element can be extracted. What is the mass percent composition of element A in the compound A505?

Dr. A needs to make 125.0 mL of a 0.225 M solution of BaCl2. What mass (in grams) of barium chloride is needed to prepare this solution? Report your answer to the correct number of significant figures. You may show your work here or on a separate sheet of paper to receive partial credit.

Calculate the molality of a solution that contains 78.2 grams of Solute in 278.8 mL of solution. The following information may be useful for this calculation. The molar mass of Solute = 120.71 g/mol The density of the solution = 1.0 g/mL

A chemist must dilute 55.5 mL of 23.0 µM aqueous magnesium fluoride (MgF₂) solution until the concentration falls to 17.0 μM. He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in milliliters. Be sure your answer has the correct number of significant digits.

7) The percent composition of an unknown substance is 75.42 % Carbon, 6.63 % Hydrogen,8.38 % Nitrogen, and 9.57 % Oxygen. If its molar mass is 334.0 g/mol what is its empirical and molecular formula?

A hospital buys a compound that contains an isotope of barium. Several months later, most of the barium has changed to the element lanthanum. Which of the following is responsible for this change? reactions with the container wall exposure to air radioactive decay absorption of moisture from the air

A patient at risk for cardiovascular disease is found to have a blood LDL concentration of 180 mg/dL. Calculate the total mass of LDL circulating in the blood of this patient given the total volume of blood is 5.3 L. 0.94 g 2.9 g 34 g 9.5 g

Hopkinsium (Hk) is an element that has not been discovered yet. There are 210 grams in one mole of Hk. If a chemist reacts 4.6 grams of Hk according to the following reaction, how many grams of HkBr will form? 2 Hk + Br₂ → 2 HkBr * -

Calculate the number of molecules of oxygen present in 0.125 moles of O₂. (1 mole = 6.022 1023 objects). Show all your working clearly. A) 3.01 x 1024 molecules B) 7.53 x 1022 molecules C) 0.125 molecules D) 6.022 x 1023 molecules

The boiling of water is a: chemical change because heat is needed for the process to occur. physical change because the gaseous water is chemically the same as the liqui physical change because the water merely disappears. chemical change because a gas (steam) is given off. chemical and physical damage.

Which of the following has a different value on the moon compared to earth? Moles Mass Weight Time

Identify the highlighted element in the periodic table and give its [1] element name and symbol; [2] group number; [3] period; [4] classification (i.e., main group element, transition metal, or inner transition metal). [1] Element name (symbol) [2] Group number (select) [3] Period [4] Classification (select)

How old is a piece of cotton cloth if the half-life of carbon-14 is 5,730 years, and the carbon-14 composition of the cloth is 22 percent that of living plants? A) 1,813 years B) 12,517 years C) 1.21 x 10-4 years ¹ D) 1.21 x 10-4 years

In the course of their desolate wanderings Oedipus and Antigone came to Colonus, a lovely spot near Athens, where the one-time Erinyes, the Furies, now the Benignant Goddesses, had a place sacred to them and therefore a refuge for suppliants. The blind old man and his daughter felt safe there, and there Oedipus died. Most unhappy in much of his life, he was happy at the end. The oracle which once had spoken terrible words to him comforted him when he was dying. Apollo promised that he, the disgraced, the homeless wanderer, would bring to the place where his grave should be a mysterious blessing from the gods. Theseus, the King of Athens, received him with all honor, and the old man died rejoicing that he was no longer hateful to men, but welcomed as a benefactor to the land that harbored him. Which statement accurately analyzes this passage from a historical perspective? (A) People who heard this story when it was first told may have believed that oracles could predict the future accurately (B) The characters in this story live in a society where everyone is equal. (C) The characters in this story are kind to one another, even when being kind turns out to be risky or frightening (D) People who heard this story when it was first told did not believe in sacred spaces.

How many joules of energy must be added to completely convert 24.0 g of ice at 0 °C to liquid water at 0 °C? The heat of fusion of water is 334 J/g, and the heat of vaporiztion of water is 2257 J/g.