Identify the following as physical or chemical changes. Explain your choices

A scientist who is trying to make an insecticide that is more toxic to mosquitoes than to humans would be involved in ________. Basic researchApplied researchTechnologySerendipityHow is chemistry defined?For each of the following activities, list the hazards involved and the ways in which exposure could occur.  Then, decide if the benefit of the activity outweighs the risk.  Propose ways in which the overall risk might be lessened. Installing a smoke detector that uses a radioactive capsule to detect particles in the airEating food that has been treated with radiation to kill harmful bacteriaEating food derived from genetically modified organisms or plantsSmoking cigarettesIdentify the following as physical or chemical changes.  Explain your choices. Formation of snowflakesRusting of a piece of ironRipening of fruitFashioning a table leg from a piece of woodFermenting grapesBoiling a potatoAn aspirin tablet usually contains 325 mg of aspirin.  What is this in grams?What is the mass in grams for a 1000 mL volume (1 Liter) of iridium if it has a density of 22.42 g/mL?Write a chemical equation for the following descriptions: Two atoms of potassium metal react with two molecules of liquid water to produce two molecules of solid potassium hydroxide (KOH) and one molecule of hydrogen gas.One molecule of carbon dioxide gas reacts with one molecule of liquid water to produce one molecule of liquid carbonic acid (H2CO3).Classify each of the following as an element, a compound, or a mixture.  Justify each answer. MercuryMilkPure waterA piece of lumberInkIced teaPure iceCarbonAntimonyCytoxan, also known as cyclophosphamide, is widely used alone or in combination in the treatment of certain kinds of cancer.  It interferes with protein synthesis and in the process kills rapidly replicating cells, particularly malignant ones.  Cytoxan has the molecular formula C7H15O2N2PCl2. How many atoms are in one molecule of Cytoxan?What elements are present in Cytoxan?What is the ratio of hydrogen atoms to nitrogen atoms in Cytoxan?Would Cytoxan be classified as an organic compound?A cook wants to pour 1.5 Liters of batter into a 2-quart container.  Will it fit?

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