Many common materials that we ingest, though quite safe in reasonable quantities, become toxic when taken in very large doses. A measure of toxicity is the LD 50 value (Lethal Dose, 50%). It is the quantity of material, expressed in mg of material per kg of subject-body-weight that, if administered to a population of subjects, would cause 50% of the population to die. The LD 50 value for FD&C Red Dye No. 40 is 10,000 mg/kg in rats. Assume that the LD 50 value for humans is the same as for rats. Calculate the number of number of glasses of Allura Red sports drink, each containing 8.8 mg of Allura Red, required to reach the LD 50 of 10,000 mg of Allura Red/kg body weight. Assume the person has a body weight of 165 lbs. 2.205 lbs 1 kg You may assume two significant figures but do not use sčientific notation. Do not include units with your answer.

Hand written solutions are strictly prohibited

A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. 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: 8.200 g • She put some solid sodium hydroxide into the graduated cylinder and weighed it. With the sodium hydroxide added, the cylinder weighed 45.74 g- • She added water to the graduated cylinder and dissolved the sodium hydroxide completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 24.09 ml. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. ml

Willa weighs a clean, dry, empty crucible and finds it to have a mass of 95.83 g. After putting a spoonful of an unknown hydrate into it, she finds that the mass has increased slightly to 99.87 g. She heats the crucible and its contents, and finds that the mass has dropped to 97.22 g. Willa is told by her teacher that the molar mass of the anhydrous salt is 75.65 g.

Can you actually write this out? It makes it much more difficult to read when it gets written out this way.     Step 1 Here we are required to find the mass of sap that would be needed for making 1kg of syrup Step 2 Here mass of maple syrup =1 kg % of sucrose in the syrup= 66% We define w/w% as the mass of solute present in 100 gm of solution  So  w/w% =mass of solute ×100mass of solutionw/w of sucrose% =mass of sucrose ×100mass of maple syrup66= mass of sucrose ×1001kgmass of sucrose =66 ×1kg100=0.66kg so in 1kg of maple syrup 0.66 kg of sucrose is presentgiven in maple sap 4% sucrose present we need to find the mass of sap which contain 0.66 kg of sucrosew/w of sucrose% =mass of sucrose ×100mass of maple sap4=0.66kg ×100mass of maple sapmass of maple sap =0.66kg ×1004=16.5 kg

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

1.  Below is a data table from an experiment in which an effervescent tablet is added to a test tube of water, producing a solution that fizzes and releases gas bubbles. The total mass of the substances and the test tube were recorded before and after the tablet was added to the test tube of water. If matter is always conserved, how do you explain these results? Explain in 3-5 sentences.

Limits are often calculated as weight per weight. The Limit of sulfate impurity in a drug substance (weight per weight) is given as 0.5 µg of sulfate per gram of drug substance. Convert 0.5 µg of sulfate per gram of drug substance into% (wt/ wt)?

An aqueous solution of sodium chloride,NaCl , is made by dissolving 1.01 grams of sodium chloride in sufficient water in a 50.0 mL volumetric flask, and then adding enough water to fill the flask to the mark. What is the weight/volume percentage of sodium chloride in the solution? Weight/volume percentage =           %

The following data were collected for several compounds of iron and oxygen:     Mass of iron that combines with 1 g of oxygen Compound A 3.49 g Compound B 2.33 g Compound C 2.62 g The ratio of the mass of iron combining with 1 g of oxygen is given for each compound. What is the ratio of that mass for Compound A/compound B? A/B =