Week 5 – Objective 4 Week of March 2 nd – Day 1

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

D = m/V D = 1.10 g/cm 3 D = g/cm 3 D = 1.11 g/cm 3 D = 0.92 g/cm 3 1. Density of liquid water is 1.00g/cm 3, an object floating in water would be less dense than water.

2.

Answer is B - Dense  When the Liquid A and Liquid B are combined, Liquid B is below Liquid A because it is more dense than Liquid A 2.

3.

3. Answer is G – Pours more slowly  Viscosity – is the resistance of a fluid to flow.  Liquids that are thicker and more dense will flow slower making them more viscous.  Liquids that are less thick and less dense will flow faster making them less viscous.

4. Fish survive through severe winters because of the property of water that allows water to — F form chemical bonds as it freezes, raising the water temperature below the ice G increase in density while it freezes, dissolving more oxygen from the air H expand when it freezes, creating a floating and insulating layer of ice J precipitate vital nutrients when it freezes, increasing the food supply

Ans. C 4.

Week 5 – Objective 4 Week of March 2 nd – Day 2

1. Which of the following is an example of a chemical change? F Ice cracking G Sugar dissolving H Milk souring J Lead melting

1. Answer is C – milk souring

2. What characteristic of water remains the same no matter what is dissolved in it ? A The ratio of hydrogen to oxygen B The ability to refract light C The hydroxide ion concentration D The freezing temperature

2. Answer is A – Ratio of Hydrogen to Oxygen

3. Rust (Fe 2 O 3 ) forms on an iron (Fe) pipe after prolonged exposure to humid air. What type of change does this illustrate? A. Mechanical B. Nuclear C. Chemical D. Physical

3. Answer is C - Chemical

4. All of these can affect the rate at which a solid dissolves in water except — A decreasing air pressure B stirring the water C increasing the temperature of the water D using larger crystals of the solid

4. Answer is A

Answers

Answers