Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
chemistry
pre assesment
| { | } |
|---|---|
| 1 Mercury has a freezing point of −39°C and a boiling point of 356.73°C. Which state will mercury be in at 0°C? YOUR CORRECT ANSWER ANSWER Gas Liquid Checkmark Plasma Solid Checkmark Correct | |
| 2 What is the physical state of a substance that has a definite shape and volume? YOUR CORRECT ANSWER ANSWER Gas Liquid Plasma Solid Checkmark Checkmark Mistake | |
| 3 A beverage is made by mixing sugar, water, and freshly squeezed lemon juice without pulp. What is the category of matter of the beverage? YOUR CORRECT ANSWER ANSWER Compound Element Heterogeneous mixture Checkmark Homog | |
| 4 A container of lip balm was left in an automobile on a hot summer day which caused it to melt. Which properties accurately describe the melting of lip balm? YOUR CORRECT ANSWER ANSWER Intensive and chemical Extensive and chemi | |
| 5 Fibers collected at crime scenes have electrical conductivity testing performed on them if they are suspected of containing metal. Which properties correctly describe the electrical conductivity of these fibers? YOUR CORRECT ANSWER | |
| 6 A person is driving an automobile when a rock hits the windshield and shatters the glass. Which change occurred when the glass was broken? YOUR CORRECT ANSWER ANSWER Chemical change No change Physical change Checkmark Chec | |
| 7 Given: 1 ft = 12 in and 1 in = 2.54 cm If the length of an iron bar is 12.3 ft, what would this measurement be in centimeters? Use the appropriate number of significant figures. YOUR CORRECT ANSWER ANSWER 0.404 cm | |
| 8 How many kilograms of gold are in a jewelry item that has a mass of 15 g and is made of 75% gold by mass? Use the appropriate number of significant figures. YOUR CORRECT ANSWER ANSWER 0.011 kg Checkmark 0.0113 kg 11 kg | |
| 9 If the sides of a triangle measure 102.0 cm, 12.47 cm, and 135.821 cm, what is the distance around the outside of the triangle in kilometers? Use the appropriate number of significant figures. YOUR CORRECT ANSWER ANSWER 0.00250 | |
| 10 Argon (Ar) has an atomic number of 18 and a mass number of 40. How many neutrons does argon have in the nucleus? YOUR CORRECT ANSWER ANSWER 18 20 22 Checkmark Checkmark 40 Correct | |
| 11 Which term is used to describe atoms that have the same atomic number but different mass numbers because of varying numbers of neutrons? YOUR CORRECT ANSWER ANSWER Anions Cations Elements Isotopes Checkmark Checkmark Correct | |
| 12 What is the atomic mass unit (amu) of a proton? YOUR CORRECT ANSWER ANSWER 0.00055 amu 0.5 amu 1 amu Checkmark Checkmark 2 amu Mistake | |
| 13 Bromine (Br) has two naturally occurring isotopes: bromine-79 at 50.69% with an atomic mass of 78.918 amu, and bromine-81 at 49.31% with an atomic mass of 80.916 amu. What is the average atomic mass of bromine? Use the appropriat | |
| 14 Naturally occurring zirconium (Zr) is composed of 51.45% of zirconium-90 (89.905 amu), 11.22% of zirconium-91 (90.906 amu), 17.15% of zirconium-92 (91.905 amu), 17.38% of zirconium-94 (93.906 amu), and 2.800% of zirconium-96 (94.908 amu). | |
| 15 Chlorine (Cl) has two naturally occurring isotopes: chlorine-35 at 75.77% with an atomic mass of 34.969 amu and chlorine-37 at 24.23% with an atomic mass of 36.966 amu. What is the average atomic mass of chlorine? Use the appropr | |
| 16 Review the following graph which shows elements in Group 1. What is the relationship between atomic radius and electron affinity? YOUR CORRECT ANSWER ANSWER They are positively related. They are directly related. | |
| 17 Review the information in the following graph, which shows elements in period 2. What is the relationship between the ionization energy and the atomic numbers for elements in period 2? YOUR CORRECT ANSWER ANSWER They ar | |
| 18 The following graph shows the ionization energy versus the atomic number. Which type of relationship is present between these characteristics? YOUR CORRECT ANSWER ANSWER Direct relationship Checkmark Inverse relationship | |
| 19 In the following balanced chemical equation, two units of solid sodium react with one unit of fluorine gas to yield two units of solid sodium fluoride. 2Na(s) + F2(g) → 2NaF(s) Which type of reaction does this represent? YOUR | |
| 20 Which description correctly characterizes a synthesis reaction? YOUR CORRECT ANSWER ANSWER Anions are removed from a solid. Elements combine to form a new compound. Checkmark Checkmark Gas evolves from a liquid. Precipitat | |
| 21 In the following balanced chemical equation, two units of aluminum react with three units of bromine to yield two units of aluminum bromide. 2Al + 3Br2 → 2AlBr3 Which type of reaction does this equation represent? YOUR CORREC | |
| 22 What is the expected charge of monoatomic ions made from elements in group 16? YOUR CORRECT ANSWER ANSWER –4 –2 Checkmark Checkmark –1 +1 | |
| 23 Which period 6 element is a nonmetal? YOUR CORRECT ANSWER ANSWER Gold Platinum Radon Checkmark Checkmark Tungsten | |
| 24 What is the formula and type of bond for the compound phosphorus pentachloride? YOUR CORRECT ANSWER ANSWER PCl2; covalent PCl2; ionic PCl5; covalent Checkmark Checkmark PCl5; ionic | |
| 25 What is the correct formula for sodium carbonate? Use the following table as needed: Common Polyatomic Ions Ion Name Formula Ion Name Formula Ammonium NH4+ Carbonate CO32– Acetate C2H3O2– Chromate CrO42– Chlorate ClO3– | |
| 26 Which geometry has an angle of 109.5° between electron groups? YOUR CORRECT ANSWER ANSWER Octahedral Linear Trigonal planar Tetrahedral Checkmark Checkmark | |
| 27 Carbon dioxide (CO2) has a linear structure. What is the angle between C–O bonds in CO2? YOUR CORRECT ANSWER ANSWER 90° 109.5° 120° 180° Checkmark Checkmark | |
| 28 Which chemical equation represents the reaction between phosphorus pentachloride and arsenic trifluoride to produce phosphorus pentafluoride and arsenic trichloride? YOUR CORRECT ANSWER ANSWER PCl5+2AsF3→2PF5+3AsCl3PCl5+2AsF3→2PF5+3AsCl3 | |
| 29 Which chemical equation correctly represents the reaction between aqueous titanium(IV) chloride and liquid magnesium to produce solid titanium and aqueous magnesium chloride? YOUR CORRECT ANSWER ANSWER TiCl4(aq)+2Mg(l)→Ti(s)+2MgCl2(aq)TiC | |
| 30 Which chemical equation correctly represents the decomposition of silver oxide to form silver and oxygen? YOUR CORRECT ANSWER ANSWER Ag2O→2Ag+O2Ag2O→2Ag+O2 2Ag2O→4Ag+O22Ag2O→4Ag+O2 Checkmark Checkmark AgO→Ag+O2AgO→Ag+O2 2AgO→2Ag | |
| 31 Which chemical equation correctly represents the reaction between calcium chloride and sodium phosphate to form sodium chloride and calcium phosphate? Use the following table as needed: Common Polyatomic Ions Ion Name Formula | |
| 32 How many moles are in 92.4 g of hydrogen chloride (HCl)? YOUR CORRECT ANSWER ANSWER 1.53 x 10–22 mol 0.395 mol 2.53 mol Checkmark Checkmark 2.19 x 1023 mol | |
| 33 If there are 5.7 moles of hydrogen atoms in a sample of water (H2O), how many moles of oxygen atoms are present in the same sample? YOUR CORRECT ANSWER ANSWER 0.35 mol 1.0 mol 2.9 mol Checkmark Checkmark 11 mol | |
| 34 How many moles are in 4.1 g of baking soda (NaHCO3)? YOUR CORRECT ANSWER ANSWER 0.049 mol Checkmark Checkmark 0.098 mol 0.55 mol 3.4 mol | |
| 35 How many moles of methane gas (CH4) are present in 892 L of gas at STP (273 K and 1.00 atm)? YOUR CORRECT ANSWER ANSWER 0.0251 mol 0.268 mol 3.27 mol 39.8 mol Checkmark Checkmark | |
| 36 In the following reaction, 35.2 g of bromine (Br2) is mixed with 23.1 g of phosphorus (P) to produce phosphorus tribromide (PBr3). 3Br2+2P→2PBr33Br2+2P→2PBr3 What are the limiting reactant and the theoretical yield, in grams, o | |
| 37 In the following reaction, 3.4 g of ammonia (NH3) is mixed with 2.1 g of hydrochloric acid (HCl) to produce 1.2 g of ammonium chloride (NH4Cl). NH3+HCl→NH4ClNH3+HCl→NH4Cl What is the percent yield of ammonium chloride (NH4Cl)? | |
| 38 How many moles of CO2 are formed in the following balanced, combustion reaction involving an excess amount of ethane (C2H6) reacting with 35 moles of O2? 2C2H6 + 7O2 → 4CO2 + 6H2O YOUR CORRECT ANSWER ANSWER 5.0 mol 10. mol | |
| 39 In the following reaction, 8.1 g of nitrogen (N2) is mixed with 4.5 g of (H2) to produce ammonia (NH3). N2+3H2→2NH3N2+3H2→2NH3 What are the limiting reactant and the theoretical yield, in grams, of ammonia (NH3)? Compou | |
| 40 Which term describes the solubility of a nonpolar substance, such as gasoline, in water? YOUR CORRECT ANSWER ANSWER Insoluble Immiscible Checkmark Checkmark Partially soluble Soluble | |
| 41 Which term describes the solubility of a nonpolar covalent compound, such as hexane, in water? YOUR CORRECT ANSWER ANSWER Immiscible Checkmark Checkmark Insoluble Partially soluble Soluble | |
| 42 A hot saturated solution is slowly cooled to room temperature so that all the solute remains in the solution, exceeding the solute's maximum solubility limit at room temperature. Which term best describes the solution formed? YOUR CO | |
| 43 Beaker A contains 10 mg of calcium chloride dissolved in 100 mL of ethanol, and beaker B contains 8 mg of calcium chloride dissolved in 100 mL of ethanol. When compared to beaker B, which statement best describes the solution in beaker A? | |
| 44 What is the molar concentration of a solution made by dissolving 2.5 moles of KCl in enough water to produce 450 mL of solution? YOUR CORRECT ANSWER ANSWER 0.0056 M 0.18 M 5.6 M Checkmark Checkmark 180 M | |
| 45 If 35 grams of KCl are dissolved in 200.0 g of water to make a solution, what is the percentage by mass of KCl in the solution? YOUR CORRECT ANSWER ANSWER 0.15% KCl 0.18% KCl 15% KCl Checkmark Checkmark 18% KCl | |
| 46 What is the volume percentage of rose extract in a solution prepared by dissolving 20 mL of rose extract in a solvent to make a 200 mL solution? YOUR CORRECT ANSWER ANSWER 0.09% 0.10% 9% 10% Checkmark Checkmark | |
| 47 Given a sodium ion (Na+) concentration of 3.5 molar, how many moles of NaCl will present in 2.0 L of solution? YOUR CORRECT ANSWER ANSWER 0.57 mol 1.8 mol 3.5 mol 7.0 mol Checkmark Checkmark | |
| 48 When an aqueous solution of silver nitrate reacts with an aqueous solution of calcium chloride, a solid silver chloride precipitate is formed along with aqueous calcium nitrate, as shown in the balanced chemical equation that follows. 2Ag | |
| 49 Zinc (Zn) and 20.0 mL of 1.0 M hydrochloric acid (HCl) were allowed to react to yield zinc chloride (ZnCl2) and hydrogen gas as shown in the following balanced chemical reaction. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) Based on th | |
| 50 What is the pH of a solution that has [H3O+] = 1 × 10–8 M, and is it an acid or a base? YOUR CORRECT ANSWER ANSWER pH = 6.0, acid pH = 6.0, base pH = 8.0, acid pH = 8.0, base Checkmark Checkmark | |
| 51 A substance has a hydroxide ion (OH–) concentration of 1.3 × 10–5 M. What is its pH, and is it an acid or a base? YOUR CORRECT ANSWER ANSWER pH = 4.89, acid pH = 4.89, base pH = 9.11, acid pH = 9.11, base Checkmark Ch | |
| 52 A substance is dissolved in water at 25°C and is determined to have a hydronium ion (H3O1+) ion concentration of 6.7 × 10–9 M. What is the pH of the substance, and is it an acid or a base? YOUR CORRECT ANSWER ANSWER pH = 5.83, ac | |
| 53 Which equilibrium constant’s expression represents the following balanced chemical equation? I2(aq)+I−(aq)⇌I−3(aq)I2(aq)+I−(aq)⇌I3−(aq) YOUR CORRECT ANSWER ANSWER Kc=[I2][I−]��=[I2][I−] Kc=[I2][I−]5[I−3]��=[I2][I−]5[I3−] | |
| 54 Which equilibrium constant's expression represents the following balanced chemical equation? 2H2(g)+CO(g)⇌CH3OH(g)2H2(g)+CO(g)⇌CH3OH(g) YOUR CORRECT ANSWER ANSWER Kc=[H2]2[CO]��=[H2]2[CO] Kc=[H2]2[CO]��=[H2]2[CO] Kc=1[H2] | |
| 55 Which equilibrium constant's expression represents the following balanced chemical equation? 2NOCl(g)⇌2NO(g)+Cl2(g)2NOCl(g)⇌2NO(g)+Cl2(g) YOUR CORRECT ANSWER ANSWER Kc=1[NO]2[Cl2]��=1[NO]2[Cl2] Kc=[NO]2[Cl2][NOCl]2��=[NO]2[Cl | |
| 56 The following endothermic reaction is at equilibrium. NH4HS(s)⇌NH3(g)+H2S(g)NH4HS(s)⇌NH3(g)+H2S(g) What will happen if the temperature is increased when the system is at equilibrium? YOUR CORRECT ANSWER ANSWER The conce | |
| 57 The given chemical reaction reaches equilibrium. O2(g)+2H2(g)⇌2H2O(g)+ heat O2(g)+2H2(g)⇌2H2O(g)+ heat How is the chemical equilibrium affected when the temperature decreases? YOUR CORRECT ANSWER ANSWER The concentratio | |
| 58 In the following formula, one unit of nitrogen (N2) and one unit of oxygen (O2) react to form two units of nitrous oxide (NO) in an exothermic reaction. N2(g)+O2(g)⇌2NO(g)+ heat N2(g)+O2(g)⇌2NO(g)+ heat If the temperature of the | |
| 59 Given: R = 0.08205 L⋅atmmol⋅K�⋅������⋅� What is the temperature, in kelvins, for 50.2 g of N2 gas in a 20.0 L tank with a pressure of 1.65 atm ? YOUR CORRECT ANSWER ANSWER 18.0 K 112 K 225 K Checkmark Checkmark 731 K | |
| 60 Given: R = 0.08205 L⋅atmmol⋅K�⋅������⋅� What is the pressure of 61.5 moles of O2 gas in a 175 L tank at 17.0°C? YOUR CORRECT ANSWER ANSWER 0.491 atm 0.690 atm 5.97 atm 8.37 atm Checkmark Checkmark | |
| 61 Which equation should be used to find the volume of an ideal gas if n, P, and T are given? YOUR CORRECT ANSWER ANSWER V = P/nRT V = nRT/P Checkmark Checkmark V = nP/RT V = PT/nR | |
| 62 As the temperature of the gas decreases and the pressure increases, which phase change occurs? YOUR CORRECT ANSWER ANSWER Compression Expansion Evaporation Liquefaction Checkmark Checkmark | |
| 63 Which conditions would be the most suitable for the liquefaction of air? YOUR CORRECT ANSWER ANSWER 1 atm and 100 K 5 atm and 160.37 K 1000 atm and 300 K 2000 atm and 73.15 K Checkmark Checkmark | |
| 64 At which temperature will nitrogen gas, N2, deviate the most from ideal gas behavior? YOUR CORRECT ANSWER ANSWER 50 K Checkmark Checkmark 100 K 200 K 300 K |
Created by:
Jrachele35
Popular Chemistry sets