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Questions in chemistry

📝 Answered - The equation for the pH of a substance is [tex]$pH =-\log \left[ H ^{+}\right]$[/tex], where [tex]$H +$[/tex] is the concentration of hydrogen ions. What is the approximate pH of a solution if the concentration of hydrogen ions is [tex]$5.0 \times 10^{-4}$[/tex] moles per liter? A. 2.7 B. 3.0 C. 3.3 D. 3.6

📝 Answered - Which of the following numbers does not have a total of four significant figures? 103.2 0.0003403 0.0202 0.1090

📝 Answered - Use the specific heat values to answer the following question: Which of the following has the smallest heat capacity?

📝 Answered - Which process occurs when oxygen combines chemically with another substance to create a new compound? A. Conflagration B. Pyrolysis C. Oxidation D. Combustion

📝 Answered - If the FDA determines that an IND is not required in a drug study, which of the following is true?

📝 Answered - Describe how we can recover alcohol from a mixture of alcohol and water.

📝 Answered - A scientist wants to determine how many moles of bromine $(Br_2)$ are needed to make 8.33 mol of lithium bromide (LiBr). $2 Li+Br_2 \rightarrow 2 LiBr$ How many moles of bromine are needed?

📝 Answered - Magnesium and chlorine react to form an ionic compound. What is the correct name of the compound formed? A. magnesium chloride B. magnesium chlorine C. magnesium chlorite D. magnesium chlorate

📝 Answered - Test your understanding of isotopes by selecting the correct relationship between the pair of atoms ${ }_5^{11} B$ Boron-10 A. Different Element B. Same Atom, Not Isotopes of Each Other C. Isotopes

📝 Answered - The equation for the pH of a substance is [tex]$pH =-\log \left[ H ^{+}\right]$[/tex], where [tex]$H +$[/tex] is the concentration of hydrogen ions. What is the approximate pH of a solution whose hydrogen ion concentration is [tex]$2 \times 10^{-9}$[/tex]?