Quiz 5 2020, answers PDF

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AMA COMPUTER CHEM FOR GRADE 12 ...

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GENERAL CHEMISTRY QUIZ AMALEAKS.BLOGSPOT.COM Which of the following has the most NaCl (MM=58.44)? The correct answer is: 1mole How many moles of NaCl are present in a solution with a molarity of 8.59M and a volume of 125mL? The correct answer is: 1.07mol Calculate the molarity of the following solution: 1.0mole of KCl in 750.0mL of solution. The correct answer is: 1.3M Which sweet tea would you expect to taste the sweetest? The correct answer is: 3.1M How many liters would you need to make 1M solution if you have 6mol of sodium hydroxide? The correct answer is: 6 What is the molarity of a solution made by adding 1.565 moles of PbNO3 to 500 mL? The correct answer is: 3.13M How many moles are needed to make 2.5L of a 3.8M solution? The correct answer is: 9.5mol How many grams of solute are dissolved in 125.0mL of 5.00M NaCl (MM=58.45)? The correct answer is: 36.5g NaCl What is the molarity of a solution made by diluting 26.5 mL of 6.00M HNO3 to a volume of 250 mL? The correct answer is: 0.636M How many mL of 10.8M HCl are required to make 100.0mL of 3.00M acid? The correct answer is: 27.8Ml What volume of 1.50 M KBr can be made from 15.6 mL of concentrated KBr with a molarity of 9.65 M? The correct answer is: 100mL

Find the molarity of 186.55 g of sucrose, C12H22011 (MM=342) in 250mL of water. The correct answer is: 2.18M How many grams of AgNO3 (MM=169.87) are needed to prepare 0.125M solution in 250mL of water? The correct answer is: 5.3g What is the molarity of 4 g of NaCl (MM=58.45) in 3,800 mL of solution? The correct answer is: 0.018 M True or False? The higher the concentration of a solution the less solutes it has in it. The correct answer is 'False'. Does NO2 have hydrogen bonding? The correct answer is: Covalent bond Does H2O have hydrogen bonding? The correct answer is: Yes Does NO have hydrogen bonding? The correct answer is: No Does HF have hydrogen bonding? The correct answer is: Yes Dipole-dipole attraction occurs when molecules are polar. Which of these molecules contains a polar bond? The correct answer is: HCl Which kind of intermolecular force is strongest? Hydrogen bonding occurs when hydrogen is bonded to N, O, or F. Which of the following has hydrogen bonding? NH3 All molecules have London forces between them, but dipole-dipole and hydrogen bonding are so much stronger that when they are present we can ignore London forces. Which of these has ONLY London forces? The correct answer is: l2 Does HCl have hydrogen bonding?

The correct answer is: No Which is stronger? The correct answer is: Intermolecular forces Does NH3 have hydrogen bonding? The correct answer is: Yes Which kinds of substances are held together by intermolecular forces? The correct answer is: Molecules (covalent) in solid and liquid phases Does CH4 have hydrogen bonding? The correct answer is: No Does H2S have hydrogen bonding? The correct answer is: No Which of these molecules could have dipole-dipole attractions? The correct answer is: HCl (electronegativity difference = 1.1) A substance capable of hydrogen bonding has a ____________ boiling point than a similar substance that doesn’t hydrogen bond. The correct answer is: Higher Which of these molecules could have dipole-dipole attraction? The correct answer is: PCl3 London forces are stronger in heavier atoms or molecules, and weaker in lighter atoms or molecules. Which of these has the strongest London forces? The correct answer is: l2 Van der Waals forces include The correct answer is: Both London and dipole-dipole attractions Which is the second strongest intermolecular force, after hydrogen bonding? The correct answer is: Dipole-dipole attraction A piece of copper has a mass of 89g and a volume of 10cm3. What would be the density of the copper? The correct answer is: 8.9g/cm3

Which unit of measurement is used for volume? The correct answer is: Milliliter Define the term “mass” The correct answer is: The amount of matter in an object What units are used to measure Density? The correct answer is: g/cm3 A brick sinks in water while a wooden block of the same size floats. This is because the brick has a ___________. The correct answer is: Higher density than the wooden block Put the liquids in order from most dense to least dense? The correct answer is: 4, 3, 2, 1 Fluids with very low viscosity very __________. The correct answer is: Fast Why do some substances float on water? The correct answer is: They are less dense than water What is viscosity? The correct answer is: A liquid’s resistance to flow Which lab tool might you use to measure the volume of a liquid? The correct answer is: Graduated cylinder Which box has a higher density? The correct answer is: Box A A block has a mass of 54g and a volume of 20cm3. What is the density of the block? The correct answer is: 2.7g/cm The piece of copper has a mass of 89g and a volume of 10cm3. What would be the density of the copper? The correct answer is: 8.9g/cm3 Which property of matter is determined by dividing its mass by its volume?

The correct answer is: Density The following liquids are poured in a beaker: alcohol (density=0.79), corn syrup (density=1.38), water (density=1.0), and cooking oil (density= 0.93). which of theses liquids will sink to the bottom of the beaker? The correct answer is: Corn syrup What is the measuring unit for mass? The correct answer is: Grams It is an indication of the escape of molecules from the surface of the liquid. The correct answer is: Evaporation As temperature increases viscosity __________. The correct answer is: Decreases Fluids with very high viscosity flow very ___________. The correct answer is: Slow What is the mass if the volume of the object is 75 cm3 and the density is 1.56g/cm3? The correct answer is: 117 grams Because of surface tension, you can put things into a full of water and… The correct answer is: The water will never spill Which characteristic of water will allow a paperclip The correct answer is: Solvent properties What word describes when water is attracted to other substances? The correct answer is: Adhesion Surface tension of water can be reduced by The correct answer is: Heating What is adhesion? The correct answer is: Water’s ability to stick to other substances Water beads up on the surface of a penny because of this property. The correct answer is: High surface tension

Describe COHESION. The correct answer is: Water molecules attracted to other water molecules Force of attraction between similar molecules is called The correct answer is: Cohesive force Water droplets take a spherical shape (as pictured) because of _________ The correct answer is: Cohesion Water’s ability to stick to glass is The correct answer is: Adhesion Tendency of molecules of the same kind to stick to one another The correct answer is: Cohesion Rain drops are spherical in shape because of The correct answer is: Surface tension Surface tension is the property of water in which… The correct answer is: Water molecules at the surface tend to stick together Refer to the picture of water sticking to a leaf; this is occurring because of: The correct answer is: Adhesion Water droplets take a spherical shape (as pictured) because of _________ The correct answer is: Cohesion Which characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of the water? The correct answer is: Solvent properties...