25,963 Answered Questions for the topic chemistry

Chemistry

09/20/23

When the temperature of the environment is 15.4°C, the enthalpy of combustion for octane (C8H18) is –44.427 MJ/kg. The molar enthalpy of combustion for octane in these conditions is ________ kJ/mol
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Chemistry

09/20/23

how do i work this problem
Atoytophasamassof32.0g Cu.Howmanyatoms Cuareinthisspinningtop,giventhattheaverageatomicmassofcopperis63.55g/mol Cu?
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09/20/23

At neutral pH, what is the net charge on a “basic” amino acid? What is the net charge on an “acidic” amino acid?

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09/20/23

What type of attractive chemical interaction can occur between a charged side group and surrounding water molecules?
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09/20/23

What types of attractive chemical interactions can occur between a neutral, hydrophilic side group and surrounding water molecules?

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09/20/23

No side groups are involved in 2° structure H-bonding. Which atoms are directly involved in α - helix and β -sheet H-bonding?

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09/20/23

Explain why the folded structure is more thermodynamically favored (i.e., stable) in an aqueous environment than the unfolded structure.

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09/20/23

β -sheets can be either intra- or intermolecular, but α -helices are always intramolecular. Briefly explain why this is the case.

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09/20/23

At neutral pH, what is the net charge on a “basic” amino acid? What is the net charge on an “acidic” amino acid?

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Chemistry

09/20/23

Provide the formula for each compound.
Provide the formula for each compound.Provide the formula for each compound. hydrochloric acid: potassium carbonate: silicon tetrabromide:
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Chemistry

09/20/23

Name the compounds. Spelling counts.
Name the compounds. Spelling counts.Name the compounds. Spelling counts.  HNO2(aq):  Cr2O3:  CCl4:
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Chemistry

09/20/23

Write the chemical formula for the compound formed by each pair of positive and negative ions.
Write the chemical formula for the compound formed by each pair of positive and negative ions.Write the chemical formula for the compound formed by each pair of positive and negative... more
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Chemistry

09/20/23

Activation Energy Diagrams│Please Help!
Diagram Link: https://assets.learnosity.com/organisations/154/25171169-48e5-4503-8ad7-555ad1d590df.PNGFill in the blanks. The activation energy is ___ KJThe reaction is _____ (endothermic or... more
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Chemistry

09/20/23

Activation Energy Diagrams│Please Help!
For the following diagram, select all statements that are true.Diagram Link: https://assets.learnosity.com/organisations/154/1b178e16-4f43-48fb-807e-ab2e138b23c8.PNGThe reaction is endothermic.The... more
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Chemistry

09/19/23

Balancing Chemical Reaction Equations │Please Help!
Magnesium (Mg) reacts with oxygen (O2) producing magnesium oxide (MgO).a. Write the skeleton reaction equation (just show reactants and products with the arrow.)b. Balance the chemical reaction.c.... more
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Chemistry

09/19/23

Balancing Chemical Reaction Equations│Please Help!
Drag and drop the coefficients to balance this equation:___C6H6 + ___O2 ==> ___CO2 + ___H2OAnswer Box:1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
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Chemistry

09/19/23

Balancing Chemical Reaction Equations │Please Help!

1.‎ Drag and drop the coefficients to balance this equation:___C6H6 + ___O2 ==> ___CO2 + ___H2O2.‎ Magnesium (Mg) reacts with oxygen (O2) producing magnesium oxide (MgO).a. Write the skeleton... more
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Chemistry

09/19/23

Chemistry Stoich
How many moles of As2O5 are produced when 5.62 mol of As react with 7.50 mol of O2?As (s) +  O2 (g)  ⟶   As2O5 (s) 
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Chemistry

09/19/23

Chemistry Stoichiometry
If 10.00 grams of CaCO3 reacts with 15.0 grams of HCl, how many grams of CO2 is produced?CaCO3 (s) +  2 HCl (aq) ⟶ CaCl2 (aq) + CO2 (g) + H2O (l) 
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Chemistry

09/19/23

Determine the formula unit for the compound formed when each pairs of ions interact.
Determine the formula unit for the compound formed when each pairs of ions interact. Li^+ and O2^−: ? Mg^2+ and S2^−: Al^3+ and Cl^−: Na^+ and N^3−:
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Chemistry

09/19/23

Determine the name or formula for each polyatomic ion.
Determine the name or formula for each polyatomic ion. formula: CO2/3 - name: ? ion name: nitrite ion       formula:? name: nitrate ion      formula:? formula: CN^-             name:  ?
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Chemistry

09/19/23

Name the ions. Spelling counts.
Name the ions. Spelling counts. Li^+: Mg ^2+: O^2−:
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Chemistry

09/18/23

[Chemistry] A reaction has the following reaction profile.

a. How many elementary steps are in this reaction pathway?b. Which step is the slowest?    (Give the letter)          c. Which step is the fastest?      (Give the letter)d. Which step determines... more
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Chemistry

09/18/23

What is the mass sulfur and the percentage?

A manufacturer begins with 10.00 kg of cinnabar and produces 8.62 kg of elemental mercury. What was the mass of sulfur in the original cinnabar?Mass of sulfur: ? kgExpress the mass of sulfur in... more
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Chemistry

09/18/23

Heating cinnabar in the presence of oxygen gas produces elemental mercury and new compounds called sulfur oxides. Is this a physical or a chemical change?
Heating cinnabar in the presence of oxygen gas produces elemental mercury and new compounds called sulfur oxides. Is this a physical or a chemical change? Physical change Chemical Change
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