General Questions and Answers

What is the mass of 3.99 mol of nickel?. mass: What is the mass of 1.29 mol of platinum? mass: Which has a greater mass, 3.99 mol of nickel or 1.29 mol of platinum? O 1.29 mol of platinum O 3.99 mol of nickel g g

During the winter months, many locations experience snow and ice storms. It is a common practice to treat roadways and sidewalks with salt, such as CaCl,. If a 18.1 kg bag of CaCl, is used to treat the sidewalk, how many moles of CaCl, does this bag contain? moles=

Complete combustion of 5.10 g of a hydrocarbon produced 16.6 g of CO₂ and 5.10 g of H₂O. Divide the number of moles of carbon and hydrogen by the smallest of the two values. Report these ratios to three significant figures. carbon: hydrogen:

A 5.27 g mixture contains both lithium fluoride, LiF, and potassium fluoride, KF. If the mixture contains 3.19 g fluorine, what is the mass of the KF in the mixture? mass of KF: g

Select the correct statements about the chemical equation shown. 6 CO₂(g) + 6H₂O(1) -> C6H₁2O6 (s) +60₂(g) 12 This chemical reaction produces a solid and a gas. Solids, liquids, and gases are involved in this chemical reaction. Only solids and gases are involved in this chemical reaction. Both products are liquids in this chemical reaction. In this chemical equation, (1) means liter.

For ALL numerical answers on this test, report the answers to the appropriate number of significant figures AND report the appropriate units! 1. Balance the following equations. a. H₂S + Cl₂ → S8 + HCI b. Al + HCI → AICI3 + H₂ c. NH3 + NO -> N2 + H2O d. C4H10+ Cl₂ + O₂ -> CO₂ + CCl4 + H₂O e. Al + NH4CIO4 -> Al₂O3 + AICI3+ NO + H₂O

If two objects have different temperatures, heat will flow from the warmer object to the cooler one UNTIL a. one of the objects reaches absolute zero b. one runs out of energy c. they have reached thermal equilibrium d. all of the above

> <Mastering Chemistry Assignment: Chapter 13 Homework Problem 13.36- Enhanced - with Feedback Shifts equilibrium in direction of reactants Ammonia is produced by reacting nitrogen gas and hydrogen gas is the following reaction: For each of the following changes at equilibrium, indicate whether the equilibrium shifts in the direction of products, shifts in the direction of reactants, or does not change: N2(g) + 3H2(g) = 2NH3(g) +92 kJ Drag the appropriate items to their respective bins. Submit increase the volume of the container add more H₂(g) Previous Answers Request Answer Shifts equilibrium in direction of products add more NH3(g) remove some N₂(g) Equilibrium does not change < decrease the temperature 12 of 17 Reset Help >

Points 3 Question 10 Identify the literary device/figurative language from the following lines from Hamlet by William Shakespeare. "Thrift, thrift, Horatio! the funeral baked meats, Did coldly furnish forth the marriage tables" Hyperbole Oxymoron Paradox

Write a balanced equation for the combination of zinc and iodine to form zinc iodide, ZnI₂. Phase symbols are not graded. balanced equation: How many moles of zinc are required to react with five moles of iodine? moles of zinc:

The addition of 9.54 kJ of heat is required to raise the temperature of 225.0 g of a liquid hydrocarbon from 20.5°C to 45.0°C. What is the heat capacity of this hydrocarbon? a. 0.94 J/g °C b. 1.73 J/g °C c. 1.88 J/g C d. 9.42 J/g°C

Which of the following is NOT a typical property of a metal? a. forms ionic compounds with nonmetals b. tendency to lose electrons to form cations c. outer electron shells contain 4 or more electrons d. high electrical conductivity

A silver picture frame has a volume of 16.0 cubic centimeters and a density of 10.5 grams per cubic centimeter. Calculate its mass. Write your answer as a whole number. grams

Classify the reaction below by choosing ALL applicable reaction types to the reaction below. 1. redox II. combination III. decomposition IV. displacement V. metathesis a. only III b. I and V c. I and III d. only V 2NH₂NO,(s) - 2N₂(g) + O₂(g) + 4H₂O(g)

Hydrogen gas can be produced from the reaction of calcium hydride and water: CaH₂ (s) + 2 H₂O (l) -> 2 H₂(g) + Ca(OH)2 (aq) How many grams of calcium hydride are needed to produce 5.34 L of hydrogen gas collected over water at 22.0 °C and a total pressure of 769.0 torr? The vapor pressure of water at 22.0 °C is 19.827 torr. R = 0.08206 L atm/ mol K Do NOT include units in your answer. If you round during your calculation, be sure to keep at least three (3) decimal places. Report your answer to one (1) decimal place.

Which set of procedures and observations indicates a chemical change? a. Ethanol is added to an empty beaker and the ethanol eventually evaporates b. A solid is gently heated in a crucible and the solid slowly turns to liquid c. Large crystals are crushed with a mortar and pestle and become powder d. A cool, shiny metal is added to water in a beaker and gas bubbles rapidly appear

5. Magnesium oxide can be made by heating magnesium metal in the presence of oxygen. The unbalanced equation is: Mg(s) + O₂ → MgO(s), When 100 g of Mg is allowed to react with 200 g O2, 120 g MgO is collected. Determine the limiting reactant, theoretical yield and percent yield for the reaction.

Balance the equations by adding coefficients as needed. Do not add anything if the coefficient is 1. |__C₂H₂ + +50₂ | 3 BaCl, + | 2 KPO, — 2 Cu(NO3)2 ->> 2]Fe + 0₂ → 3 CO₂ + 2 CuO + 0₂ → Fe₂0₂ - 4 H₂O Ba3(PO4)2 + 0₂ + 6 KC1 4 NO₂

What is the general equation associated with first electron affinity? Select the correct answer below: OX(g) + e →→ X¹ (g) ->> OX(g) + e- X¯(g) OX(g) X¹ (g) + e-¯ OX(g) → X¯(g) + e

If 137.0 g of the mixture produces 2.08 g of H₂O, 19.68 g of CO2, and 4.39 g of O2, what was the mass of each compound in the mixture? Assume complete decomposition of the mixture. NaBr does not react under the reaction conditions. mass of NaBrO3: mass of NaHCO3: mass of Na₂CO3: mass of NaBr: 13.8 19.32 42.4 Incorrect 40.8 60 g 60 g 9

We're told oxygen is the most common element in the Earth's solid crust. But how much oxygen is there? Let's compare to the amount of oxygen in the Earth's atmosphere, like this: • The most common minerals in the Earth's crust are feldspars, and sanidine (KAISi3Og) is a typical feldspar. Let's assume the entire crust is made of 3 sanidine, with a density of 2.5 g/cm³. . The radius of the Earth is 6371. km and let's say the crust is the upper 50.0 km of it. 3 • Let's model the Earth's atmosphere as a layer on top of the Earth about 100. km thick with an average density of 0.99 g/m³, and which is 23.1% oxygen by mass. Use this information to calculate the ratio of the mass of oxygen in the Earth's atmosphere to the mass of oxygen in the Earth's crust. Round your answer to 2 significant digits.

The reaction of aluminum with chlorine gas is shown. 2 Al + 3Cl₂ → 2 AICI, Based on this equation, how many molecules of chlorine gas are needed to react with 10 aluminum atoms? number of Cl₂ molecules: How many units of aluminum chloride (AIC13) can be produced from 10 aluminum atoms? number of AlCl3 units:

Classify the following reaction and identify the limiting reagent when 15 grams of each reactant are used. 2NaCl(aq) + Hg(NO3)₂(aq) → HgCl₂(s) + 2NaNO,(aq) a. Metathesis, Hg(NO₂)2 b. Displacement, NaCl c. Catalysis, Hg₂Cl₂ d. Decomposition, NaCl

A certain dose of Tums contains 750.0 mg of calcium carbonate, CaCO3, in each tablet. In this problem, you will follow the steps to calculate how many grams of stomach acid, HCl, are neutralized by one tablet of Tums. Balance the chemical equation for the reaction of HCl with CaCO3. chemical equation: Using the balanced equation, determine how many moles of HCl will react with 1 mol of CaCO3. moles of HC1: Calculate how many moles 750.0 mg CaCO3 is. 750.0 mg CaCO3 = 4 mol mol CaCO3

This is the chemical formula for tale (the main ingredient in talcum powder): Mg, (Si₂O), (OH), An analytical chemist has determined by measurements that there are 83.9 moles of oxygen in a sample of talc. How many moles of hydrogen are in the sample? Round your answer to 3 significant digits.

Nitric acid can be produced in the reaction shown below with a percent yield of 75%. If 45 g of NO2 are used in a particular experiment, how many grams of nitric acid can be produced? O 30.8 g O 69.3 g O 41.1 g O 54.8 g 3 NO₂ (g) + H₂O (1) ® 2 HNO3 (aq) + NO (g)

If one mole of potassium reacts in this manner, how many moles of \(\ce {H_{2}}\) are produced? moles of \(\ce{H_{2}}\text{:}\) 0.5 How many moles of potassium are required to produce \(23.0-\text{moles}\) of \(\ce{H_{2}}\text{2}\) moles of potassium: 46 How many moles of \(\ce{KOH}\) are produced if \(3369.5-\text{moles}\) of \(\ce{H_{2}0}\) are consumed? moles of \(\ce{KOH}\text{:}\) mol mol mol

Silicon (28 g, 1.0 mole) and oxygen (128 g, 4.0 moles) are reacted in a sealed container. At the end of the reaction, how much silicon, oxygen, and silicon dioxide are present in the container? Complete the following table. SiO₂ Starting Moles Change Ending Moles Ending Grams O₂ change: Si ending moles: O, ending moles: Si 1.0 mol -1.0 mol + 0₂ 4.0 mol mol mol mol - 0 mol SiO₂ change: Si ending grams: O₂ ending grams: mol g g

Which of the following are redox reactions? O A only O A and B OA, B and C O A, B, C and D B) C) D) PCl3 + Cl₂ PCI, Cu + 2 AgNO3Cu(NO3)₂ + 2 Ag CO₂ + 2 LiOH Li₂CO3 + H₂O FeCl₂ + 2 NaOH > Fe(OH)₂ + 2 NaCl

Which of the following statements about strong soluble bases is FALSE? a. They are composed of either alkali metals or some of the more reactive alkaline earth metals. b. They are all metal hydroxides. c. Their solutions conduct electricity. d They are classified as weak electrolytes

Henry is always energetic and finishes his work on time, but today he is lethargic and could not complete the assigned task. What does the word lethargic mean in this context? O Sluggish Unhappy Enthusiastic

A mixture of hydrocarbons contains 32.1% hexane, C6H₁4, 11.2% octane, Cg H₁8, and 56.7% decane, C₁0H₂2. The mixture is combusted in an excess of oxygen. What mass of CO₂ is generated from the combustion of 10.1 kg of the mixture? mass of CO₂: 2.090 Incorrect kg

Which is an example of pseudoscience? use of X-rays to observe the bones of the arm O use of DNA analysis to determine paternity use of vaccines to prevent the occurrence of disease use of astrology to predict the personality of a child

Suppose you have Avogadro's number of mini marshmallows and use them to cover the state of New Mexico which has a land area of 1.214 × 105 mi². Each mini marshmallow has a diameter of 0.635 cm and a height of 2.54 cm. Assuming the marshmallows are packed together so there is no space between them, to what height above the surface, in kilometers, will the mini marshmallows extend? height: 6213.3 km

Calorimetry is used to study the change in enthalpy and determine enthalpies of reaction by controlling which of the following variable(s)? a. Volume b. Pressure c. The transfer of heat between the universe and the system and surroundings under study d. All of the above

Choose the appropriate answer. The left handed pitcher threw fastballs at almost 100 miles per hour. The left-handed pitcher threw fastballs at almost 100 miles-per-hour. The left-handed pitcher threw fastballs at almost 100 miles per hour.

Which of the statements describe a mole? Avogadro's number of items the amount of a substance containing the same number of formula units as there are atoms in 12 g of carbon 6.022 x 1023 items mass x acceleration

Choose the appropriate answer. We ate chocolate-filled-pastries for dessert. We ate pastries for dessert that were chocolate-filling. O We ate chocolate-filled pastries for dessert.

Mexican Muralist movement This art movement began in Mexico in the early 1920s when, in an effort to increase literacy, Education Minister José Vasconcelos commissioned artists to create monumental didactic murals depicting Mexico's history on the walls of government buildings. Artists of the Mexican Muralist movement include José Clemente Orozco, Diego Rivera, and David Alfaro Siqueiros. Middle ground The part of the picture that is between the foreground and background. Minimalism An artistic movement of the 1960s in which artists produced pared-down three- dimensional objects devoid of representational content. Their new vocabulary of simplified, geometric forms made from humble industrial materials challenged traditional notions of craftsmanship, the illusion of spatial depth in painting, and the idea that a work of art must be one of a kind. Source: https://www.moma.org/learn/moma_learning/glossary A glossary A thesaurus An online dictionary

Why does the glossary for New York's Museum of Modern Art often include links to works by individual artists? In this way, the museum hopes to attract new visitors. These works illustrate the concepts defined in the glossary. When a definition is very short, the links make it appear longer.

Convert 1.00 g of each element to moles. How many moles of calcium are in 1.00 g? 1.00 g Ca = How many moles of zinc are in 1.00 g? 1.00 g Zn = How many moles of xenon are in 1.00 g? 1.00 g Xe = mol Ca mol Zn mol Xe

A small child goes to touch a hot stove and burns their hand. The child then puts their hand into a bowl of ice water to relieve the pain. Which answer best describes the changes in the thermal motion of the particles in the hand of the child? a. Remains the same b. Increases and then decreases c. Decreases and then increases d. None of the above

From the context, find the meaning of the word dissipated. Gray smoke spurted out of the stubby stove-pipe, spurted up a long way before it spread out and dissipated. Decayed Vanished Demolished

The vocabulary section for this lesson most closely resembles which reference tool? Vocabulary 1. Dictionary: A comprehensive reference tool containing words, listed alphabetically, with their precise definitions and other relevant information. 2. Thesaurus: A reference tool containing words, listed alphabetically, with their synonyms and antonyms. 3. Glossary: A reference tool containing specialized terms, listed alphabetically, with their definitions. 4. Guide words: In a dictionary, the first and last words on a page, listed in the top corner. 5. Etymology: The origin of a word and the history of its development. 6. Phonetic spelling: A system of spelling in which each letter represents invariably the same spoken sound. A thesaurus A citation guide A glossary

Tin has 10 stable isotopes. The heaviest, 124Sn, makes up 5.80% of naturally occurring tin atoms. How many atoms of 124Sn are present in 95.0 g of naturally occurring tin? atoms of 124Sn: 4.16 X1023 Incorrect What is the total mass of the 124Sn atoms in this sample? total mass of the 124Sn: 0.691 atoms 9

An equilibrium reaction has a Ke of 2.7 x 10-6. Which of the following accurately describes the chemical equilibrium for this reaction? ► View Available Hint(s) O The concentrations of the products are approximately the same as the concentrations of the reactants. O The concentrations of the reactants are less than the concentrations of the products. The equilibrium is said to favor the reactants. O The concentrations of the products are less than the concentrations of the reactants. The equilibrium is said to favor the reactants. O The concentrations of the products are greater than the concentrations of the reactants. The equilibrium is said to favor the products.

1. Consider the reaction shown below: CaCO3 (s) + 2 HCl (aq) → CaCl2 (aq) + CO₂ (g) + H₂O (1) a) How many mL of 0.55M HCl are needed to react with 3.7 g of CaCO3? b) After the reaction has gone to completion, what volume of CO2 gas can be collected at 25.0°C and barometric pressure of 755 mmHg? (Vapor pressure of water at 25.0°C is 23.8 mmHg)

Tia has a sample of pure gold (Au). She weighed the sample and the result was 34.3 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 34.3 g of pure gold.

The molecules that transport cholesterol from dead or dying cell back to the liver are called? O High-density lipoproteins (HDLs) O Low-density lipoproteins (LDLs) O Intermediate-density lipoproteins (IDLs) O Very low-density lipoproteins (VLDLs) O Chylomicrons

The samarium-147 nuclide radioactively decays by alpha emission. Write a balanced nuclear chemical equation that describes this process.