General Questions and Answers

Select the single best answer. Give the IUPAC name for the compound. O 2-methyl-3-propylhexane 4-isopropylheptane O H CH3 CH3 -CH₂CH₂CH3 H CH₂CH₂CH3 4-propylheptane 5-methyl-4-propylhexane

The following line is taken from a webpage. Identify the correct in-text citation based on MLA formatting. "We may be the only ones who think that braving a series of crumbling death traps is proof of good decision making." O(Kaufmann and Spooner) O Kaufmann, Spooner O (Kaufmann; Spooner)

The following quote is used in a source text. Now, you want to restate the quoted text in your writing. Choose the correct in-text citation for the given quote according to the MLA formatting style. "A writer is someone for whom writing is more difficult than it is for other people." O(qtd. in mann, 22) O(qtd. in mann: 22) (qtd. in mann 22)

The light emitted from a laser has a wavelength of 308 nm. What is the frequency of this light expressed in megahertz (MHz)?

The frequencies of radio stations are given in MHz. For example, 91.3 FM has a frequency of 91.3 MHz. What is the wavelength of this frequency in meters? Hint, change MHz (megahertz) to Hz first.

If 0.790 g of glucose are burned in a bomb calorimeter, the temperature of the 600. g of water in the calorimeter increases J from 15.40 °C to 19.50 °C. If the heat capacity of the calorimeter is 470.- what is the value of q for the combustion of C' the glucose sample? • Use Cwater = 4.184 J g C • Report your answer using three significant figures. Provide your answer below: kJ

If the light emitted has a wavelength of 655 nm, then what is the frequency of this light expressed in hertz (Hz)? c = 3.00 x 108 m/s and c = Av Give answer as number x 10exponent (first blank is value to 3 SF, second blank is exponent, use proper scientific notation) x 10

A chemist prepares a solution of silver perchlorate (AgCIO) by measuring out 1.2 kg of silver perchlorate into a 350. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's silver perchlorate solution. Round your answer to 2 significant digits.

J What is the heat capacity of an aluminum cup that weighs 13.80 g? The specific heat of aluminum is 0.897- three significant figures. g °C -. Round to

[References] You mix 125 mL of 0.280 M CSOH with 50.0 mL of 0.700 M HF in a coffee-cup calorimeter, and the temperature of both solutions rises from 21.70 °C before mixing to 24.94 °C after the reaction. CsOH(aq) + HF (aq) → CsF(aq) + H₂O(l) What is the enthalpy of reaction per mole of CsOH? Assume the densities of the solutions are all 1.00 g/mL, and the specific heat capacities of the solutions are 4.2 J/g. K. Enthalpy of reaction = kJ/mol

Choose the sentence that is capitalized correctly. Eden is going to study Social Studies, Science, Spanish, and Math this week. Eden is going to study Social Studies, science, Spanish, and math this week. Eden is going to study social studies, science, Spanish, and math this week.

What is the chemical formula for the compound formed between iron(III) and the iodate ion? chemical formula: B chemical formula: U X₂ 25 What is the chemical formula for the compound formed between iron(III) and the borate ion?

A flame is used to heat a piece of nickel. Calculate the temperature change if 39 g of nickel absorbs 556 J of energy. The specific heat of nickel is 0.44- J g °C Select the correct answer below: 7.7°C 32°C 49°C 14°C

There are 5 areas of chemistry: physical chemistry, organic chemistry analytical chemistry, biochemistry and inorganic chemistry Identify which of the five areas of chemistry best fits the action done by Louis, a chemist. Louis is investigating a new way to isolate nickel from various nickel-containing rocks and sediment. Answer: chemistry

5. If 30.0 mL of 0.500 M KOH are needed to neutralize 10.0 mL of HC1 of unknown concentration. Show your work. HCl + KOH → KC1 +H₂O a) Calculate how many moles of KOH were used b) How many moles of HC1 were in a sample? c) What is molarity of the HC1?

If 4.700 moles of water react completely, according to the following equation, what is the total change in enthalpy? 6CO₂ + 6H₂O C6H₁2O6 +60₂ AHrxn = 2,803 kJ • Report your answer using four significant figures.

Choose the sentence that is free from agreement error. When Peter stopped to take few pictures with his camera, a flock of geese were honking by the fields. Either the doctor or the nurses refuses to treat the accident cases at the clinic. O To participate in the local marathon, Philip and Ivan run three miles every day.

A system absorbs heat from the surroundings and does work on the surroundings. What are the signs of system and Wsystem? Select the correct answer below: O 9system <0 and Wsystem > 0 O 9system > 0 and Wsystem >0 O9system > 0 and Wsystem < 0 O 9system <0 and Wsystem < 0 BE315 FEEDBACK

Identify the subject and the verb in the following sentence. Sheila practices being a soccer goalie after school every day and on weekends so that she can be an asset to her team. O Every day after school Being a soccer goalie O Sheila practices

Write the balanced net ionic equation for the precipitation of chromium(III) phosphate from aqueous solution:

PROBLEM 1 2.5 M KCI M^^^^^^ 5.0 osmol PROBLEM 3 2.3 M CaS wwwwwwww 4.6 osmol ATE THE OSMOLARITY PROBLEM 2 4.5 M C6H12O6 4.5 osmol PROBLEM 4 1.5 M Be3(PO4)2 7.5 osmol

If 4.500 moles of water react completely, according to the following equation, what is the total change in enthalpy? 6CO₂ + 6H₂O →→C6H12O6 +60₂ AHrxn = 2,803 kJ • Report your answer using four significant figures.

An object with a heat capacity of 445 J/C experiences a temperature change from 76°C to 43°C. How much heat is released in this process? • Do not include a negative sign in your response. • Report your answer using two significant figures.

What is the sum of the coefficients when the following equation is balanced with the simplest whole numbers? if a substance has an understood 1 as the coefficient, do not forget to add it in. Fe2O3 (s) + C (s)→ Fe (s) + CO₂ (9)

How much heat is produced by the combustion of 123 g of propane (C3 Hg)? C3H8 (g) +50₂ (g) - Select the correct answer below: O 2.73 x 105 kJ O 796 kJ O 1.24 x 104 kJ O 6.19 × 10³ kJ 3CO2(g) + 4H₂O(1) AH' = -2220. kJ mol

Which statements about physical properties of matter are true?. Some Mysical properties are size-dependent. All physical properties are size-independent. Some physical properties can be observed, and others can be measured. Physical properties are always measurable.

What is the standard enthalpy of formation (at 1 atm and 25°C) for O₂ (g)? Select the correct answer below: O 0 kJ/mol O 25 kJ/mol O 100 kJ/mol -50 kJ/mol H

Which of the following should be considered to check the authority of a book? The aspects covered by the book. If the author is a subject-matter expert and the publication. The audience of the book.

When heated, KCIO, decomposes into KCI and O₂. 2 KCIO, 2 KCl +30₂ If this reaction produced 70.9 g KCl, how many grams of O, were produced?

Magnesium (Mg) combusts in air to give a brilliant white light that has been used in photographic flashes and emergency flares. How much heat is produced if 10.0 g Mg is combusted with excess oxygen gas? Mg(s) + O₂(g) → MgO(s) AH = -601.6 kJ/mol • Report your answer with three significant figures.

Write the net ionic equation for the complete molecular equation shown below: 3 Cu(NO3)2 (aq) + 2 (NH4)3PO4 (aq) -> Cu3(PO4)2 (s) + 6 NH4NO3(aq) Write positive reactant ion in first blank and negative reactant ion in second blank; and don't forget to include the number of each ion as well as the chemical ion symbol and charge! Symbol of positive spectator ion is Symbol of negative spectator ion is

Matter can be classified first into substances and Substances can be classified into elements and can be classified as or homogeneous.

Consider the following unbalanced equation for the combustion of butane. C₂H₁0 (9) + O₂(g) → CO₂ (g) + H₂O(g) Balance the equation. Express your answer as a chemical equation. Identify all of the phases in your answer... Determine how many moles of O₂ are required to react completely with 5.0 mol of C4H10

For the reaction shown, calculate how many grams of each product form when the following amounts of reactant completely react to form products. Assume that there is more than enough of the other reactant. 2 Al (s)+Fe₂O3 (s) → Al2O3 (s) + 2 Fe (1) Express your answer using two significant figures. Express your answer using two significant figures.

Given the following equations, determine the standard enthalpy of formation (ΔH) for BrF3(g). Br₂(g) + 3 F₂ (g) → 2 BrF3(g) ΔH298 = -552 kcal Br₂(1)→ Br₂(g) ΔH298 = 8 kcal Select the correct answer below: -272 kcal -536 kcal -544 kcal -276 kcal

A flame is used to heat a piece of iron. Calculate the temperature change if 34 g of iron absorbs 599 J of energy. The specific heat of iron is 0.45 J / g C Select the correct answer below: 18°C 7.9°C 87°C 39°C

What is the function of a subordinating conjunction? It joins a dependent clause to a main clause. It shows the logical relationship between the main clause and the dependent clause. It introduces a subordinate clause. All of the choices

Counting cells: You have 8 ml of a cell suspension. You mix together 0.25 ml of 0.4% (w/v) Trypan Blue with 0.25 ml of HBSS buffer and 0.25 ml of your cell suspension. When you count this in a haemocytometer your average count per square (of a volume of 0.1 μl each) is 25 cells. How many cells per ml do you have in the original suspension? a. 500000 b. 250000 c. 6000000 d. 1000000 e. 750000

What is the use of "comparative advantage" organization? To disprove or rebut an opposing claim. To motivate listeners to adopt a course of action. To demonstrate the superiority of one viewpoint or proposal over another.

Use the interactive to view the molecule from different angles. Identify the molecular geometry around the central atom of formaldehyde, CH₂O. linear tetrahedral bent trigonal planar trigonal pyramidal What are the approximate bond angles in formaldehyde? 109.5° 120° 90° 180°

Choose the correct answer. While a speaker needs an audience to address, listeners need someone to whom they will listen. Together, this is called a feedback loop performance loop feedback

For the reaction, calculate how many grams of the product form when 3.4 g of Cl₂ completely reacts. Assume that there is more than enough of the other reactant. 2 Na (s) + Cl₂ (g) → 2 NaCl (s) Express your answer using two significant figures. mNaCl = For the reaction, calculate how many grams of the product form when 3.4 g of CaO completely reacts. Assume that there is more than enough of the other reactant. CaO (s) + CO₂(g) → CaCO3 (s) Express your answer using two significant figures.

The elements in the periodic table are grouped by similar chemical properties, which come from the similarities in the arrangement of their electrons. These electron arrangements can be expressed as generic outer electron configurations, i.e., the electron configuration outside the noble gas core, for all periods in a group using n instead of a specific number. Similarly, the generic Lewis dot structures for each group can be drawn using X to represent a generic element symbol. Match each generic electron arrangement to the appropriate periodic group number. Note that not all of the electron arrangements must be used.

The experiment calls for preparing one of two salts, either copper(ii) sulfate or potassium aluminum sulfate. The instructions for the copper(ii) sulfate preparation give a target of between 0.025 and 0.050 moles of the copper(ii) sulfate product. The instructions also specify to use an excess of sulfuric acid but not more than 5 times the amount required by the balanced equation. Sulfuric acid will be available as a 6.0 M H₂SO4 solution. What is the volume of 6.0 M H₂SO4 required by the balanced equation to react with the CuO to produce 0.025 moles of copper(ii) sulfate. Report the volume needed BEFORE allowing for excess in milliliters to two significant figures. Don not include units in the answer box. CuO(s) + H₂SO4(aq)-> CuSO4(aq) + H₂O(1)

Ice floats on water. For most other substances, however, the solid sinks in the liquid. Classify each of these statements based on whether they describe water or most other substances. Water The solid is more dense than the liquid. The molecules are closest in the liquid phase. Answer Bank The solid is less dense than the liquid. In a phase diagram, the solid-liquid coexistence line has a negative slope. Most other substances High pressure will cause the solid to become liquid. In a phase diagram, the solid-liquid coexistence line has a positive slope. High pressure will cause the liquid to become solid. The molecules are closest in the solid phase.

Calculate the mass in grams of Ag2S (silver sulfide) that can be produced with 54 grams of Ag (silver) based on the following equation: (2 point) 2Ag(s) + H₂S (aq) Ag2S(s) + H2(g) Show your calculations

Og is the noble gas after Rn. To go from [Rn] to [Og], you must fill four subshells (s, p, d, and f) with a total of 32 electrons. Thus, the atomic numbers of sixth and seventh period elements of the same group differ by 32. To go from [Og] to the next noble gas, however, you would theoretically fill five subshells (s, p, d, f, and g). How many electrons are needed to fill all five subshells? number of electrons: Element 104 in the periodic table is Rf. Determine the atomic number of the element just below Rf in the periodic table. atomic number:

Calculate the mass in grams of Fe2S3 (iron III sulfide) that can be produced with 432 grams of S (sulfur) based on the following equation: (2 point) 2Fe(s) + 3S (s) → Fe2S3(s)

What is the law of energy conservation? Select the correct answer below: Energy is neither created nor destroyed, but it may change forms. The entropy of the universe is constantly increasing. The entropy of a pure substance at absolute zero is defined as zero. Temperature is a measure of heat.

Mercury is used as a liquid in thermometers. A volume of five cubic centimeters (5 cm) of mercury has a mass of 68 grams (68 gm). What is the density of mercury in gm/cm³? (Use the formula, D = M/V)