Freezing salt-water experiment
Contents: Contents, introduction and literature review on page 1. Aim, hypothesis, variables, risk assessment, materials and method on page 2. Results on page 3. Discussion and conclusion on page 4.
Introduction: I have decided to do my SRP on salt water freezing because our planet is 71% water and about 96.5% of it is in the ocean which it is salt water so this is why I was interested in seeing how much salt, depresses the water from freezing.
Literature review: Does Salt affect the freezing point of water?
Water freezes from molecules entering and leaving the solid at the same rate. But when you add salt it disrupts this from happening. Also water when not affected by salt normally freezes at 0 degrees, but adding salt lowers the freezing point. When ice melts it gets energy from the liquid around it and then the liquids cool. Eventually, the temperature cools to make the water molecules slow down enough so that more molecules can attach themselves to the ice. So the more salt, the lower the temperature of the new freezing point. A similar experiment done by science with kids had 3 cups with water one had normally table salt, one had …show more content…
Hypothesis: My hypothesis is that when water is not affected by salt it freezes at 0 degrees but I believe that when there is salt in the water it will lower the freezing point.
Variables: The independent variable is the amount of salt in the water and the dependent variable is the amount of water.
Risk assessment:
Risk Nature of risk Minimisation strategies
Slam fingers in freezer Broken finger Be carful and close the freezer slowly.
Glass measuring cup Cuts from broken glass Wear covered shoes and handle with care.
Materials: 4 cups, water, table salt, measuring cup, a freezer, weight, glad wrap, thermometer.
Method:
Step1. Get 4 of the same cups.
Step2. Label each cup as a b, c and
Contents: Contents, introduction and literature review on page 1. Aim, hypothesis, variables, risk assessment, materials and method on page 2. Results on page 3. Discussion and conclusion on page 4.
Introduction: I have decided to do my SRP on salt water freezing because our planet is 71% water and about 96.5% of it is in the ocean which it is salt water so this is why I was interested in seeing how much salt, depresses the water from freezing.
Literature review: Does Salt affect the freezing point of water?
Water freezes from molecules entering and leaving the solid at the same rate. But when you add salt it disrupts this from happening. Also water when not affected by salt normally freezes at 0 degrees, but adding salt lowers the freezing point. When ice melts it gets energy from the liquid around it and then the liquids cool. Eventually, the temperature cools to make the water molecules slow down enough so that more molecules can attach themselves to the ice. So the more salt, the lower the temperature of the new freezing point. A similar experiment done by science with kids had 3 cups with water one had normally table salt, one had …show more content…
Hypothesis: My hypothesis is that when water is not affected by salt it freezes at 0 degrees but I believe that when there is salt in the water it will lower the freezing point.
Variables: The independent variable is the amount of salt in the water and the dependent variable is the amount of water.
Risk assessment:
Risk Nature of risk Minimisation strategies
Slam fingers in freezer Broken finger Be carful and close the freezer slowly.
Glass measuring cup Cuts from broken glass Wear covered shoes and handle with care.
Materials: 4 cups, water, table salt, measuring cup, a freezer, weight, glad wrap, thermometer.
Method:
Step1. Get 4 of the same cups.
Step2. Label each cup as a b, c and