Preparation and Properties of Compounds Questions and Answers

When aqueous solutions of sodium acetate and hydroiodic acid are mixed, an aqueous solution of sodium iodide and acetic acid results. Write the net ionic equation for the reaction. Use the solubility rules provided in the OWL Preparation Page to determine the solubility of compounds. Use H+ for the hydronium ion, CH3COOH for acetic acid and CH3COO¯ for the acetate ion. Be sure to specify states such as (aq) or (s) in your answers.

Identify the correct order for solubility of 2nd group. Solubility of oxalates increases from Ca to Ba Solubility of fluorides decreases from Ca to Ba Solubility of hydroxides increases from Ca to Ba Solubility of carbonates decrease from Ca to Ba

Give the number of significant figures for each of the following results. a. The length of the candle is 5.05 inches. b. The sample only weighs 0.0060 g on the electronic scale. c. The scientist measures the rate to be 8.010×102 meters/second. HOW DO WE GET THERE? Determine the number of significant figures in the following result: The length of the candle is 5.05 inches. Number of significant figures =

What is the formula for sulfurous acid?

What is the chemical formula for potassium permanganate?

A chemist needs to know the mass of a sample of aniline to 2 significant digits. He puts the sample on a digital scale. This is what the scale shows: 00047.7 g If this measurement is precise enough for the chemist, round it to 2 significant digits.

How many atoms of cobalt equal a mass of 58.93 g? (Refer to the Periodic Table.) 27 58.93 59 1 6.02 x 10^23

II. It combustion is to be initiated and sustained, all of the following elements must be present except a. The presence of a fuel b. The availability of oxygen c. The application of heat d. The absence of carbon monoxide

An organic compound consisting of carbon, hydrogen, and oxygen only weighs 13.669 g. Analysis shows that the compound contains 0.547 g and 8.707 g of the last two of these elements, respectively. What is the percent- age composition of this compound?

Use the interactive to observe which objects float and sink in water. Based on these results, identify whether each of these objects that are not in the interactive will float or sink in water. The density of each object is given. beeswax (0.961 g/mL) leather (0.946 g/mL) ivory (1.83 g/mL) silver (10.49 g/mL) rubber (1.506 g/mL)

A student found that a 1.0-mL sample of water contained 20 drops. Showing your work, calculate how many drops would be in 5.0-mL of water.

You are driving 56 mi/h and take your eyes off the road for "just a second" (exactly one second). What distance (in feet) do you travel in this time?

Which of the following is the complete, balanced equation for the reaction that occurs when sodium metal reacts with water to form hydrogen gas and aqueous sodium hydroxide? Na(s) + 2H2O(I) —> 2NaOH(aq) + 2H2(g) Na(s) + 2H2O(I) --> NaOH(aq) + 2H2(g) Na(s) + H2O(I) --> NaOH(aq) + H2(g) Na(s) + H2O(I) --> NaOH(aq) + H( g) 2Na(s) + 2H2O(I) - 2NaOH(aq) + H2(g)

12) Draw diagrams (outer electrons only) to show the bonding in the following covalent molecules. Draw a before-bonding picture and after-bonding picture for each on another sheet of paper (your drawings should be similar to the example above): a) Chlorine-Cl₂ b) Oxygen - O2 (draw with a double bond between the O atoms; the four electrons are actually a single bond and two unpaired shared electrons) c) Carbon dioxde - CO₂ (place the atoms in a line with C in the middle)

In the Bohr model of the hydrogen atom, an electron can exist between orbits. True False

The following ions contain the same number of electrons. Rank them in order of decreasing ionic radii. Rank from largest to smallest radius. To rank items as equivalent, overlap them.

Which one of the following statements concerning the use of eggs in food preparation is correct? The green colour of iron sulphide, sometimes present in eggs, can be prevented by increasing the cooking time. Egg yolks contain lecithin and cholesterol. The smell of rotten eggs is caused by the presence of cholesterol in the yolk. The formation of meringue results from changes in the carbohydrate chains of the egg white. Mayonnaise is essentially a mixture of egg white and oil. None of these statements is correct.

The chemical formula for potassium bromide is KBr. A chemist determined by measurements that 0.0900 moles of potassium bromide participate in a chemical reaction. Calculate the mass of potassium bromide that participates. Round your answer to 3 significant digits.

A meringue is composed and prepared by using whole eggs that have air beaten into them. whole eggs that are treated with dilute acid. fats that are beaten with air and small protein particles. none of these options is correct. egg yolks that are treated with acid. egg whites that have air beaten into them.

Select which is correct as to how meat tenderizer products improve the texture of tough meats. Tenderizing products only improve the appearance, not the texture of meats. Synthetic enzymes break down the fat molecules. A natural enzyme breaks down proteins. Natural enzymes break down the fat. None of these is correct. A meat tenderizer is widely known as a person who hand-squeezes the meat to soften it and tenderize it.

Which one of the following statements about onions and/or garlic is true? Garlic is regularly used in mouthwash. Onions release volatile organic sulphur compounds which decompose upon cooking. Onions contain many different organic nitrogen substances which are responsible for their odour. Garlic and onions are composed mainly of protein. Onions give off a mixture of organic bases which acidify the food. None of these statements is correct.

Which of the following combinations of elements in a compound would be ionic? barium and fluorine hydrogen and sulfur sulfur and oxygen hydrogen and fluorine all of these

Which one of the following would be expected to have the greatest effect on life expectancy? Increasing legume intake None of these options is correct. Reducing dairy intake Reducing white meat intake Increasing vegetable intake Increasing fish intake

Calculate the number of moles of CaCO3 (calcium carbonate, or limestone) in a 20.0 g sample of this substance. 2.00 × 10^3 moles 0.200 mole 0.294 mole 1.36 x 10^3 moles 1.20 × 10^3 moles

Calculate the number of moles of NaHCO 3 (sodium bicarbonate, or baking soda) in a 5.0 g sample of this substance. 0.096 mole 0.060 mole 420 moles 3.6 x 10 22 moles 2.8 × 10 23 mole

Which of the following statements regarding ionic and molecular compounds is correct? Molecular compounds are expected to have very high melting and boiling points compared to ionic compounds. Molecular compounds are strong electrolytes in aqueous solution. An ionic compound can be a gas, liquid, or solid at room temperature. Molecular compounds form crystalline solids that are hard and brittle. lonic compounds are expected to have very high melting and boiling points compared to molecular compounds.

Which of the following is an example of a pure substance? sand tap water aluminum in a soda can (not considering the paint or plastic coatings) river water granite

Which of the following does not apply to a chemical compound? A chemical compound consists of two or more elements. The elements in a compound are combined in definite proportions. The characteristics of the compound are different from the characteristics of the elements from which it is made. Compounds can be separated into their constituent elements using only physical methods. A chemical compound can also be classified as a pure substance.

Write the formulas for the compounds described by the following compositions. (a) twice as many hydrogen atoms as sulfur atoms (b) 1.5 times as many oxygen atoms as nitrogen atoms (c) one-half as many calcium ions as chloride ions

Calcium phosphate, Ca3(PO4) 2, is used to treat calcium deficiencies. What is the molar mass of this compound? 87.05 g/mol 167.05 g/mol 279.21 g/mol 230.02 g/mol 310.18 g/mol

If the displacement (size) of a motorcycle engine is 1500 cm 3, which of the following equivalences is incorrect? V= 1500 mL V= 1.500 L V = 1.500 × 10-3 m 3 V = 15.00 m 3 both V= 1500 mL and V = 15.00 m 3

One mole of methane (CH4) and one mole of oxygen (O2) would have the same number of atoms. True False

Barium sulfate is a compound used to assist in diagnosing medical problems through x-ray analysis and is 58.8% barium. What mass of barium is present in a 620 mg tablet of barium sulfate? 81 mg 230 mg 360 mg 1100 mg 11 mg

How do you know if a base is strong or weak? Use this simulation to explore strong bases and answer the question below. Make sure to explore both the "Molecules" and "Graph" views. Based on this simulation, what is true of bases? Select all that apply. Strong bases have lower pH values than weak bases. When a strong base dissociates, the concentration of the strong base in the solution becomes negligible. Strong bases completely dissociate into M (metal cation) and OH Strong bases dissociate to form more hydroxide ions than a weak base. The products formed when a strong base dissociates can carry out a reverse reaction to form the strong b once more.

A sample of hard water contains 2 mg CaCl₂ and 2 mg MgCl2 per liter. Calculate the hardness of water in terms of CaCO3 present in 106 parts of water. Molar mass of CaCl2 - 111 g mol-¹, MgCl2 - 95 g mol-1 and CaCO3 - 100 g mol-1. 1.95 ppm 2.50 ppm 3.90 ppm 125 ppm

Oleum is considered as a solution of SO3 in H₂SO4, which is obtained by passing SO, in solution of H₂SO4 When 100 g sample of oleum is diluted with desired weight of H₂O then the total mass of H₂SO4 obtained after dilution is known as % labelling in oleum. For example, a oleum bottle labelled as 109% H₂SO4 means the 109 g total mass of pure H₂SO4 will be formed when 100 g of oleum is diluted by 9 g of H₂O which combines with all the free SO3 present in oleum to form H₂SO4 as SO3 + H₂O → H₂SO4 What is the % of free SO3 in an oleum that is labelled as '104.5% H₂SO4' ?

From your work on the previous screen, you saw that double-replacement reactions follow the following general pattern: AB+CD→ AD + CB Based on this, which of the reactions below are double-replacement reactions? Mg(s) + 2HCl(aq) → MgCl₂ (aq) + H₂(g) 2AgNO3(aq) + Zn(s) → 2Ag(s) + Zn(NO3)2(aq) BaCl₂ (aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq) Pb(NO3)2(aq) + 2KI(aq) → 2KNO3(aq) + PbI₂ (s)

Carbon disulfide, (CS₂) has what electronic and what molecular structure according to VSEPR theory? Tetrahedral, bent Linear, linear. Tetrahedral, trigonal pyramidal Trigonal planar, trigonal planar none of these. Tetrahedral, tetrahedral

what is the equilibrium expression for the following reaction? NH4NO3(s) <......> NH4+ (aq) + NO3-(aq) [NH4NO3] / [NH4+]+[NO3 -] [NH4+][NO3] [NH4+]+[NO3-]/[NH4NO3] [NH4+][NO3-]/[NH4NO3] [NH4NO3]/[NH4+][NO3]

For each of the following, carry out the mathematical operation and report answers in scientific notation. (a) (3.1 × 10 5) x (2.0 × 10 -²) (b) (7.0 × 10 9) + (2.0 × 10²) (c) (2,8 × 10 -4) + (9,6 × 10 -2) (d) (5,0 x 10 -4)² (e) (8.50 × 10 5) – (3.0 × 10 4) (f) (6.4 × 10 -³) ÷ (4.0 × 10³)

Which equation represents a non-oxidation-reduction process? Fe + 2HCI --> FeCl2 + H₂ Zn(NO3)2 + Na2CO3 --> ZnCO3 + 2NaNO3 C₂H4 + O2 --> CO2 + H₂O Cl₂ + 2NaBr --> 2NaCl + Br₂ More than one response is correct.

A 200.0 mL flask at 99°C and a pressure of 733 torr contains 0.970 g of vapor of a substance Z. What is the molar mass of Z in grams per mole? Pay attention to units!

Which of the following is not one of the three major types of rocks? anthracite igneous sedimentary metamorphic

In a reaction 0.4875 g of FeCl₂ was dissolved in water and reacted with 1.00 ml of 0.0242M silver(I)nitrate (AgNO3). Which is the limiting reagent and what is the theoretical yield of silver(I) chloride (AgCl)? Eqn: 2AgNO3(aq) + FeCl₂taq) → 2AgCl(s) + Fe(NO3)2

At 27. °C, a gas occupies a volume of 2.75 L under 0.500 atm of pressure. At what temperature will this same amount of gas occupy 3.10 L with 0.700 atm of pressure? Assume ideal gas behavior. Provide your answer as an integer.

Determine the molar mass (in g/mol) of a gas that travels with an effusion time that is 2.38 times longer than that of F₂(g). Enter your answer in decimal notation to three significant figures. Answer: Enter Value g/mol

Why does water (H₂0 TB = 100°C) have a higher boiling point temperature in comparison to hydrogen sulfide (H₂S TB = -60°C)? H₂O is just a lot more stubborn than H₂S H₂O is a more polar molecule than H₂S Intermolecular forces are greater for H₂S in comparison to H₂O H₂O has a lower heat of vaporization than H₂S H₂O has a higher vapor pressure than H₂S

Pb + Zn(OH)₂+ OH-Zn + HPbO₂ + H₂O In the above reaction, the oxidation state of zinc changes from to How many electrons are transferred in the reaction?

Problem: When 100. mL of 0.100 M NaOH is mixed with 100. mL 1.00 M HCl the temperature of the solution increases from 25.0 °C to 28.0 °C. Calculate the AH for the reaction. Give: ducation -1.1 g/mL, Csolution - 4.1 J/g C

A sample of oxygen gas collected at a pressure of 0.751 atm and a temperature of 10.0 °C is found to occupy a volume of 27.6 liters. How many moles of O₂ gas are in the sample?