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Home Question Bank Chemistry Archive 2025 January 21

Chemistry Questions from Jan 21,2025

Browse the Chemistry Q&A Archive for Jan 21,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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3 Mr. Arswan prepares a mixture for a science experiment. He measures 10.5 grams of wood shavings, 150 grams of iron filings, and 18.50 grams of salt. What is the total mass of Mr. Arswan's mixture? MISSED THIS? Watch KCV: Atomic Theory; Read Section 2.3. You can click on the Review link to access the section in your eText. An automobile gasoline tank holds 35.0 kg of gasoline. When all of the gasoline burns, 158.0 kg of oxygen is consumed, and carbon dioxide and water are produced. Express your answer to one decimal place with the appropriate units. Use the atomic mass of lithium to calculate the relative abundances of the two isotopes. Express your answers using one decimal place. Enter your answers separated by a comma. lithium-6 abundance, lithium-7 abundance \( = \) ? 24. You have a sample with a mass of 700 g and a volume of \( 524 \mathrm{~cm}^{3} \). Find its density. 25. When the BP Oil Spill occurred in 2010 , oil could be seen floating on the surface of the Gulf of Mexico for miles. If the oil has a density equal to \( 0.84 \mathrm{~g} / \mathrm{mL} \), then what must be true about the density of the water in the Gulf of Mexico? Esercit ... \( \cdot \) DS.doc Apricon Documenti Google Esercitatevi Calcolare quanti grammi di ossigeno occorrono per bruciare completamente 155 g di etano secondo la reazione: \( 2 \mathrm{C}_{2} \mathrm{H}_{6}(\mathrm{~g})+7 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 4 \mathrm{CO}_{2}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \) 19. Iridium has two naturally occurring isotopes. \( { }^{191} 1 \mathrm{r} \) and \( { }^{193} 1 \mathrm{r} \) have atomic masses of 190.9609 amu and 192.9633 amu , respectively. The average atomic mass for iridium is 192.22 amu . What is the percent natural abundance for each isotope? Drag and drop the words or phrases that accurately complete the summary. As the \( \square \) In a chemical reaction \( \square \) , the \( \square \) in the particles increase. This causes the chemical reaction to happen \( \square \) As the temperature in a chemical reaction! \( \square \) the energy in the particles decrease. This causes the chemical reaction to happen \( \square \) temperature increases energy slower decreases faster \begin{tabular}{l} Задача 3. Определете вида на химичните реакции и аргументирайте от- \\ говора си. \\ а) водороден пероксид \( \rightarrow \) вода + кислород \\ б) сяра + кислород \( \rightarrow \) серен диоксид \\ \hline в) серен триоксид \( \rightarrow \) серен диоксид + кислород \\ \hline\end{tabular} Higher temperatures make the make microscopic atoms and molecules move A. slower B. in the same direction C. in opposite directions D. faster Using the "NAS" idea, how many electrons are "needed" for the compound HOCl? Hint: Remember H only needs 2 electrons. \( \begin{aligned} \text { rather than } 8 \\ \text { C. } 36\end{aligned} \)
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