Anew potential heart medicine, code-named x-281, is being tested by a pharmaceutical company, pharma-pill. as a research technician at pharma-pill, you are told that x-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top secret. the company is interested in the drug's ka value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries. to find the pka of x-281, you prepare a 0.093 m test solution of x-281 at 25.0 ∘c. the ph of the solution is determined to be 3.00. what is the pka of x-281?

What is the relation between concentration of reactants and the rate of chemical reaction?

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5

Apound is approximately 0.45 kilogram. a persons weighs 87 kilograms. what is the persons’s weight, in pounds, when expressed to the correct number of significant figures