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UCBA has computers (loaner laptops and on-site computers) th…

Posted on: February 1, 2025 Last updated on: February 14, 2025 Written by: Anonymous
UCBA has computers (loaner laptops and on-site computers) that students may use to take exams. UCBA also has reliable WiFi and quiet places where students can take exams.   Please select the answer that best applies to you.
Continue reading “UCBA has computers (loaner laptops and on-site computers) th…”…

Consider the reaction of iron (III) oxide with carbon to for…

Posted on: February 1, 2025 Last updated on: September 24, 2025 Written by: Anonymous
Consider the reaction of iron (III) oxide with carbon to form iron metal and carbon dioxide gas: 2 Fe2O3 (s) + 3 C (c) →  4 Fe (s) +  3 CO2 (g)            
Continue reading “Consider the reaction of iron (III) oxide with carbon to for…”…

Three separate 3.5 g blocks of Al, Pb and Cr are heated from…

Posted on: February 1, 2025 Last updated on: September 24, 2025 Written by: Anonymous
Three separate 3.5 g blocks of Al, Pb and Cr are heated from 25°C is heated to 75°C. Which block requires absorbtion of the most amount of heat (q) to reach the final temperature?  
Continue reading “Three separate 3.5 g blocks of Al, Pb and Cr are heated from…”…

Consider an unknown metal sample that weighs 10.0 g. If the…

Posted on: February 1, 2025 Last updated on: February 14, 2025 Written by: Anonymous
Consider an unknown metal sample that weighs 10.0 g. If the unknown metal absorbs 309 J of energy to heat up from 10.0°C to 27.0°C, what is the most likely identity of the metal?  
Continue reading “Consider an unknown metal sample that weighs 10.0 g. If the…”…

What is the oxidation number for the chlorine atom in the co…

Posted on: February 1, 2025 Last updated on: February 14, 2025 Written by: Anonymous
What is the oxidation number for the chlorine atom in the compound, potassium perchlorate, KClO4?
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Three separate 3.5 g blocks of Sn, Hg and Cr are heated from…

Posted on: February 1, 2025 Last updated on: September 24, 2025 Written by: Anonymous
Three separate 3.5 g blocks of Sn, Hg and Cr are heated from 25°C is heated to 75°C. Which block requires absorbtion of the most amount of heat (q) to reach the final temperature?  
Continue reading “Three separate 3.5 g blocks of Sn, Hg and Cr are heated from…”…

Consider the reaction where hydrogen gas reacts with bromine…

Posted on: February 1, 2025 Last updated on: September 24, 2025 Written by: Anonymous
Consider the reaction where hydrogen gas reacts with bromine gas to form hydrogen bromide gas: H2 (g) + Br2 (g) →  2 HBr (g)      
Continue reading “Consider the reaction where hydrogen gas reacts with bromine…”…

Consider the reaction below: H2S (g) + Cl2 (g) → S (s) + 2 H…

Posted on: February 1, 2025 Last updated on: September 24, 2025 Written by: Anonymous
Consider the reaction below: H2S (g) + Cl2 (g) → S (s) + 2 HCl (g) The element                   is undergoing reduction and                     is the reducing agent.
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A system releases 89 kJ of heat and has 111 kJ of work done…

Posted on: February 1, 2025 Last updated on: September 24, 2025 Written by: Anonymous
A system releases 89 kJ of heat and has 111 kJ of work done on it. What is the value of ΔE (in kJ) for the system?
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Of the following, the heat of formation,  ΔH°f, is zero for …

Posted on: February 1, 2025 Last updated on: September 24, 2025 Written by: Anonymous
Of the following, the heat of formation,  ΔH°f, is zero for              .  
Continue reading “Of the following, the heat of formation,  ΔH°f, is zero for …”…
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