Week 5 – Objective 4Week 5 – Objective 4

Week of March 2Week of March 2ndnd – Day 1 – Day 1

1. Which of the following objects will float on water?

D = m/V

D = 1.10 g/cm3

D = 1.125 g/cm3

D = 1.11 g/cm3D = 0.92 g/cm3

1.

Density of liquid water is 1.00g/cm3, an object floating in water would be less dense than water.

2.

Answer is B - DenseAnswer is B - Dense

When the Liquid A and Liquid B are When the Liquid A and Liquid B are combined, Liquid B is below Liquid A combined, Liquid B is below Liquid A because it is more dense than Liquid Abecause it is more dense than Liquid A

2.

3.

3. Answer is G – Pours more slowly3. Answer is G – Pours more slowly

Viscosity – is the Viscosity – is the resistanceresistance of a fluid to of a fluid to flow. flow.

Liquids that are thicker and more dense Liquids that are thicker and more dense will flow slower making them will flow slower making them moremore viscous. viscous.

Liquids that are less thick and less dense Liquids that are less thick and less dense will flow faster making them will flow faster making them lessless viscous. viscous.

4. Fish survive through severe winters because of 4. Fish survive through severe winters because of the property of water that allows water to — the property of water that allows water to —

F F form chemical bonds as it freezes, raising the form chemical bonds as it freezes, raising the water temperature below the icewater temperature below the ice

G G increase in density while it freezes, dissolving increase in density while it freezes, dissolving more oxygen from the airmore oxygen from the air

HH expand when it freezes, creating a floating and expand when it freezes, creating a floating and insulating layer of iceinsulating layer of ice

J J precipitate vital nutrients when it freezes, precipitate vital nutrients when it freezes, increasing the food supplyincreasing the food supply

Ans. C

4.

Week 5 – Objective 4Week 5 – Objective 4

Week of March 2Week of March 2ndnd – Day 2 – Day 2

1. Which of the following is an example of a1. Which of the following is an example of a

chemical change?chemical change?

F F Ice crackingIce cracking

G G Sugar dissolvingSugar dissolving

HH Milk souring Milk souring

J J Lead meltingLead melting

1. Answer is C – milk souring

2. What characteristic of water remains 2. What characteristic of water remains the same no matter what is dissolved in the same no matter what is dissolved in it ?it ?

A The ratio of hydrogen to oxygenA The ratio of hydrogen to oxygen

B The ability to refract lightB The ability to refract light

C The hydroxide ion concentrationC The hydroxide ion concentration

D The freezing temperatureD The freezing temperature

2. Answer is A – 2. Answer is A – Ratio of Hydrogen to Oxygen Ratio of Hydrogen to Oxygen

3. Rust (Fe3. Rust (Fe22OO33) forms on an iron (Fe) pipe) forms on an iron (Fe) pipe

after prolonged exposure to humid air. Whatafter prolonged exposure to humid air. What

type of change does this illustrate? type of change does this illustrate?

A.A. MechanicalMechanical

B.B. NuclearNuclear

C.C. ChemicalChemical

D.D. PhysicalPhysical

3. Answer is C - Chemical3. Answer is C - Chemical

4. All of these can affect the rate at which a4. All of these can affect the rate at which a

solid dissolves in water except —solid dissolves in water except —

AA decreasing air pressure decreasing air pressure

B B stirring the waterstirring the water

C C increasing the temperature of the waterincreasing the temperature of the water

D D using larger crystals of the solidusing larger crystals of the solid

4. Answer is A4. Answer is A

AnswersAnswers

AnswersAnswers