For the following diagram, select all statements that are true. 100 80 60 PE (kJ) A+B 40 20 C+D Progress of the reaction O The reaction is endothermic. The activation energy of the reaction is 100kJ. O The energy of the reactants is 40kJ. O The energy change of the reaction is -20kJ.

This is not graded. Do #1

For the reaction below: CH₂ + Cl₂ CH₂-CI + H-CI a. Estimate the gas phase enthalpy change using bond dissociation enthalpies from the OWL Table Reference, not data from your text. Click the References button and then click the Tables link on the drop-down that appears. Include algebraic sign and units. b. Is the reaction exothermic or endothermic? c. Is the reaction likely to proceed spontaneously in the direction written?

3. A. Draw and label an energy diagram for a slow endothermic reaction B. A weather balloon contains 222 L of helium gas at 20.8 °C and 754 mm Hg. What is the volume in liters of the balloon when it rises to an altitude where the pressure is 552 mm Hg and the temperature is -40.0 °C C. Draw two different Lewis structures for C2H4O2, connecting the atoms differently in your two structures. Label the shape of each carbon atom in both structures.

A compound such as sodium nitrate that exists almost exclusively as separate ions when it dissolves in water.

21.! A) Atoms combine to form molecules because the energy of the molecule is lower than the energy of the free ! Which statement A-D about chemical bonds is NOT correct? atoms. B) The electrostatic potential energy explains why atoms bond together C) The electrostatic potential energy is directly proportional to the charges on two particles. D) The electrostatic potential energy is inversely proportional to the distance between two charged particles. E) Statements A-D are all correct 22. ) How many valence electrons are there in PO43? a) 10 c) 29 b) 14 d) 32

An bond is the force of attraction that holds together positive and negative ions. 3 4 6 7 DELL -> & %23 %$4 7 8. 6 EGO y e * 00

Draw and upload a picture of KCl and one of MgO at the atomic level. Include at least 4 formula units of each. Make sure to correctly show both the ratio and the relative size of the ions. Please select file(s) Save Answer Select file(s)

A fictional compound contains two elements.  Here's what you know: Nyeon (X): a main group metal, has 3 valence electrons Tysonium (Y): a nonmetal, has 6 valence electrons A. Is this an ionic compound, a covalent compound, or an acid? B. What would the chemical formula of this compound be?

17. Calculate the number of formula units in an antacid containing 500.0 mg of calcium carbonate.