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Water is less dense as a solid than as a liquid. How does this property typically affect a lake ecosystem in freezing temperatures?
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- As water cools below 4°C, it expands and becomes less dense. Why is this beneficial to organisms living in a lake during a cold winter?Cities near the ocean often have less variation between winter and summer than cities inland. Which characteristic of water is related to this observation? A:Temperature stability B:Cohesion C:Good solvent D:DensityAs surface water in a lake cools from 4 °C to 0 °C, the water expands and becomes less dense. Why is this change in the water beneficial to the organisms living in the lake? As the water cools to freezing, spaces form between water molecules, providing microhabitats for small organisms. Less dense water holds more dissolved compounds, keeping water from freezing so organisms survive winter. O Cooler water is less viscous than warmer water, making it easier for organisms to move through the water. O Frozen surface water insulates the water below it, maintaining a habitat where organisms can overwinter.
- A solution with 0.4M sucrose will have a higher water potential than a solution with 0.5M sucrose. True or FalseScientists are interested in investigating how limestone can be used to remediate the effects of acid rain. They collect water from a lake that has recently been exposed to acid rain. They divide the water into 10 different tanks and add different amounts of limestone to nine of the tanks. No limestone is added to one of the tanks. The pH of the water in the tanks is measured before the limestone is added and once every hour for 24 hours. (f) Identify the independent variable in this investigation. (g) Identify the dependent variable in this investigation. (h) Identify the control group in this investigation. (i) Describe one additional variable that has not been mentioned that could affect the results of the investigation. (G) Describe a modification that could be made to the investigation that would affect the results.What prevents the lakes of colder parts of the world from freezing solid from bottom up? Water in the solid form is at the maximum density. 88888 Surface tension keeps the ice floating. Ice is less dense than liquid water. Warm water is less dense than cold water. Wind causes mixing of the water.
- You might have noticed that in space exploration, attention is often focused on the presence or absence of water on other planets. What characteristics of water make it as essential for life as we know it on Earth?a) What substances can make water in lakes and ponds hard? b) Are these substances generally harmful or are they beneficial to organisms living in the water?Solution A has a more negative water potential than solution B. Which of the following statements is/are 1 correct? Statement 1: Solution B has a higher wa potential than solution A Statement 2: There would be a net movement of water from solution A to solution B Statement 3: There would be a net movement of water from solution A to distilled water A 1,2 and 3 are correct B Only 1 and 2 are correct C Only 2 and 3 are correct D Only 1is correct Memb