A standard crank ice cream maker uses a mixture of ice water and salt to cool ice cream mix to the point of freezing. If ice cream freezes at 27 degrees Fahrenheit, what is the minimum concentration of salt needed to make ice cream?

Can you please help me answer the homework

A geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of 69.32 g.L The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 5.02 g⋅L¯¹. Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated. Be sure your answer has the correct number of significant digits.

Potassium chloride (salt) is added to water and the mixture is stirred until no more salt dissolves. The salt that does not dissolve is allowed to settle out. Refer to the container on the left of the figure. At this point, is the solution saturated, unsaturated, or supersaturated?       The water is allowed to evaporate until the volume of the solution is half the original volume. The temperature remains constant during this entire time. Nothing special is done to the solution to trick it. Refer to the container on the right of the figure. At this point, is the solution saturated, unsaturated, or supersaturated?       After evaporation, is the mass of potassium chloride dissolved in solution more than, less than, or the same as the mass of potassium chloride dissolved in solution before evaporation? (YES, You are seeing more solid on the bottom of the container on the right.)       After evaporation, is the concentration (molarity) of the solution more than, less than, or…

The maximum level of lead allowed in drinking water is 15mg/kg. What is this concentration in units of parts per million?

A chemistry student must write down in her lab notebook the concentration of a solution of potassium chloride. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: • The label on the graduated cylinder says: empty weight: 1.55 g • She put some solid potassium chloride into the graduated cylinder and weighed it. With the potassium chloride added, the cylinder weighed 31.436 g. • She added water to the graduated cylinder and dissolved the potassium chloride completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 166.4 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. -1 g.mL x10 × Ś

Epsom salt is a product that may be added to a bath to help ease sore muscles. Epsom salt crystals Epsom salt ground crystals A materials scientist tested two forms of Epsom salt under different conditions to see which would dissolve the fastest. The test information is displayed in this table. Sample Mass Form Water temperature A 50 grams ground crystals 30°C B 100 grams crystals 20°C 50 grams 100 grams ground crystals 20°C crystals 30°C Which sample of Epsom salt would you expect to dissolve the fastest? O A. A В. В ос. С O D. D

A solution of atrazine (an herbicide) in water has a concentration of 0.050 µg/L. What is this concentration in units of ppb? Assume a solution density of 1.00 g/mL.

1. (answer the questions in the tan boxes in the tables below each question) A student conducted an investigation to determine the effect of water temperature on the amount of sugar that dissolves in a beaker of water. Identify components for trial 1 of this investigation. Beaker Number 1 2 3 4 Amount of Water (mL) 100 100 100 100 Amount of Water (mL) Trial 1 Temperature of Temperature of Amount of Sugar Sugar (°C) Water (°C) Dissolved (g) 20 20 20 20 Temperature of Sugar 5 10 15 20 185 189 194 204 Temperature of Water Terms Variable Constant Amount of Sugar Dissolved

A solution is made using 450.0 mL of isopropanol (density 0.7860 g/mL) and 137.5 mL of water (density 1.000 g/mL). What is the mass percent of the isopropanol?