Inorganic Chemistry Questions

Atomic Structure 2: Electronic Structure:Question 6 Which statement describes patterns in how nonmetals in groups 16 and 17 behave when forming ions? Nonmetals in groups 16 and 17 tend not to lose or gain any electrons. Nonmetals in groups 16 and 17 tend to first lose and then gain electrons. Nonmetals in groups 16 and 17 tend to gain electrons. Nonmetals in groups 16 and 17 tend to lose electrons.

Use scientific notation to express the number 0.013562 to: 1) one significant figure 2) two significant figures 3) three significant figures 4) four significant figures 5) five significant figures

Dimensional analysis is: based on the principle that units are unnecessary in chemistry based on the principle that the units in an equation can be treated like numbers based on the principle from physics that units should be derivatives based on the principle that all units are the same

Sodium carbonate is used in the manufacture of paper. What is the chemical formula for this compound? Express your answer as a chemical formula.

What is the formula for sulfurous acid?

A solution contains both Fe²+ and Fe³+ ions. 25.0 ml of this solution required 45.0 ml of 0.01 M acidified permanganate solution. In a separate analysis 25.0 ml of the original solution is treated with Zn powder which reduces Fe³+ into Fe²+ and it then required 3.76 ml of 0.2 M acidified KMnO4 solution to reach the end point. Determine the molarity of Fe³+ is the original solution.

What is the chemical formula for potassium permanganate?

A solution contains both Fe2+ and Fe3+ ions. 25.0 ml of this solution required 45.0 ml of 0.01 M acidified permanganate solution. In a separate analysis 25.0 ml of the original solution is treated with Zn powder which reduces Fe3+ into Fe2+ and it then required 3.76 ml of 0.2 M acidified KMnO4 solution to reach the end point. Determine the molarity of Fe3+ is the original solution.

Perform the following calculation, and choose the correct result that is rounded to the appropriate number of significant figures. NOTE: Treat all ambiguous zeroes (trailing zeroes before an implied decimal point) as NOT significant. [(0.5487) + (1.886 × 10¹)]/ [(9.648) (1.19 x 10¹)] -8.6x10⁰ -9x10⁰ -8.62x100 -8.618x10⁰ -8.61843x10⁰

If a box has the dimensions 2.45cm x 5.98cm x 4.11cm, what is the volume of the box in in³? 2.74in³ 3.67in³ 13.9in³ 0.498in³

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

(a) Estimate the maximum wavelength used for analysis. 550 of visible light absorbed by the purple Co-complex ion that you synthesized c nm; (b) What is the oxidation state of Co in the complex ion?(c) Determine the crystal field splitting energy, A., in units of J/photon and kJ/mol-photons.

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)

For each of the mathematical expressions given: 1. Tell the correct number of significant figures for the answer. 2. Evaluate the mathematical expression using correct significant figures in the result. 485 / 9.231 2.17 + 4.32 + 401.278 + 21.826 452 x 6.2 / 34.3 2.46 × 2 15.467 - 9.23 10.4+3.75 + 274.6

2- The following data set are four replicas for the measurements of the concentration in Molarity of NaCl in Human Serum (0.163, 0.164, 0.166, and 0.169) calculate: a) The arithmetic mean or sample mean b) The Median c) The sample standard deviation d) The range or spread e) Conduct the t-student's test with 95% confidence

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?

Elemental sulfur is yellow in color and has an unpleasant odor similar to rotten eggs. Answer the following questions about sulfur. How many valence electrons? What is the valence shell? Name another element that has a similar dot diagram.

A sample of water is found to contains following dissolving salts in milligrams per litre Mg(HCO3)2 = 73, CaCl2 = 111, Ca(HCO3)2 = 81, MgSO4 = 40 and MgCl2 = 95. Calculate temporary and permanent hardness and total hardness.

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)

List the number of protons, neutrons, and electrons for 40 Ca²+: 40 protons, 20 neutrons, and 20 electrons 40 protons, 20 neutrons, and 18 electrons 20 protons, 20 neutrons, and 18 electrons 20 protons, 20 neutrons, and 22 electrons 60 protons, 20 neutrons, and 18 electrons

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

A laser used in DVD players has a wavelength of 405 nm. What is the energy of this light in joules? 4.91 × 10^-28 J 4.91 × 10^-19 J 8.05 × 10^-32 J 8.05 x 10^-23 J 2.98 × 10^-32 J

Which of the following statement is incorrect regarding allotropes ? Rhombic sulphur is the most stable at room temperature. White phosphorus is the most reactive among allotropes of phosphorous. Yellow phosphorus is soluble in CS₂ while red phosphorus is not Graphite have sp2 while diamond has sp hybridised 'C' atom.

Compute 4.659 x 10^4 - 2.14 x 10^4. Round the answer appropriately. Express your answer as an integer using the proper number of significant figures (e.g. 12300). 4.659 x 10^4 - 2.14 x 10^4 =

To answer this question, you have to do some research or read the relevant chapter in the textbook. The mole concept is related to everyday chemistry. For this exercise, you are going to calculate the number of molecules or atoms. Identify one food item, find out what elements or compounds are in this item. Explain how you would calculate the number of molecules or atoms of your interest. Respond others having a difficult time with calculation.

Which of the following is incorrect statement about lithium? Melting and boiling point of lithium is higher than other alkali metals LiCl is deliquescent and crystallises as a hydrate LiCI.2H2O Lithium hydrogen carbonate is thermally most stable among alkali metal hydrogen carbonate Lithium nitrate on heating produces Li2O, NO2 and O2

Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes. 1. 2NO(g) + O₂(g) - 2NO₂(g) 2. CO₂ (s) -> CO2(g) 3. Pb(NO3)2(aq) + 2AgCl(aq) -> PbCl2(s) + 2AgNO3(aq) I, II, and III I and II only I and III only I only II and III only

Upon electrification, hydrogen produces a characteristic line spectrum consisting of four lines in the visible region of the electromagnetic spectrum. The light emitted in different regions of the visible spectrum corresponds to transitions from the third (n = = 3), fourth (n = 4), fifth (n = 5), or sixth (n = 6) energy level down to the second (n = 2). Which transition corresponds to the red line in the hydrogen spectrum? n=2 -> n=3 n=2 -> n=6 n=3 -> n=2 n=4 -> n=2 n=6 -> n=2

How many mg are in 6.2 kg? Use two significant figures in your answer.

People with lactose intolerance cannot digest _____ which eventually results in the production of _____. milk sugar, hydrogen gas None of these options are correct. sugar in beets, hydrogen gas fava beans, carbon dioxide gas cellulose, several bowel gases fava beans, methane gas

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.

Which of the following changes represents a physical change, rather than evidence of a chemical reaction? When a piece of zinc metal is placed in a solution of HCI, bubbles begin to form, and the zinc begins to dissolve. When solid ammonium carbonate, (NH 4)2CO3, is heated, the solid disappears, and gaseous ammonia (NH3), carbon dioxide (CO2), and water (H2O) are formed. When dry ice (solid CO2) is allowed to stand at room temperature, gaseous CO2 is formed. When a solution of KI is mixed with a solution of Pb(NO 3)2, a yellow solid is formed. When a piece of copper wire is placed in a solution of AgNO3, a silvery solid begins to form on the surface of the wire, and the solution turns blue.

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 6.25 g sample of magnetite (Fe 30 4) contains 4.52 g of Fe. What are the percentages of iron and oxygen in magnetite? 28.6% Fe and 71.4% O 42.8% Fe and 57.2% O 72.3% Fe and 27.7% O 27.7% Fe and 72.3% O 57.2% Fe and 42.8% O

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.