Chemistry

Maltose is a carbohydrate molecule that provides energy to plants early in their life cycle . Which elements are most common in a molecule of maltose? carbon and hydrogen copper and nitrogen iron and phosphorus magnesium and sulfur

Which reasons explain why acids are added to foods? Check all that apply. to make the foods more corrosive to reduce spoilage to add zestor sour taste to food to make the food taste bitter

Use standard enthalpy and entropy data from Appendix G to calculate the standard free energy change for the reaction shown here (298 k). What does the computed value for Delta G^circ say about the spontaneity of this process? C_(2)H_(6)(g)arrow H_(2)(g)+C_(2)H_(4)(g) Delta G^circ =-102.0kJ/mol ; the reaction is spontaneous at 25^circ C Delta G^circ =-102.0kJ/mol : the reaction is nonspontaneou s at 25 {}^circ C Delta G^circ =102.0kJ/mol ; the reaction is nonspontaneous at 25 {}^circ C Delta G^circ =102.0kJ/mol ; the reaction is spontaneous at 25^circ C

Question 7 of 10 What kind of scientist would study the effects of acid rain on marble statues? A. A physicist B. A chemist C. An economist D. A biologist

8. At a particular temperature, K=4.38 for the reaction SO_(2)(g)+NO_(2)(g)rightarrow SO_(3)(g)+NO(g) If all four gases had initial concentrations of 1.0 M, calculate the equilibrium concentration for all species. (5 points) 9. The Ksp for silver chromate, Ag_(2)CrO_(4), is 9.0times 10^-12 a. Write the balanced chemical equation for this dissolving process AND the Ksp expression. (3 points) b. Calculate the solubility of silver chromate in pure water (3 points) c. Calculate the solubility of silver chromate in the presence of 0.0050 M potassium chromate solution. (3 points)

Excellent! What does the Control O_(2) graph show? a) Hydrogen peroxide concentration increased over time b) Oxygen concentration increased over time c) Oxygen concentration decreased over time d) Water concentration decreased over time

Which is the best theory to describe acids and bases? Conservation of mass Lewis theory Bronsted-Lowry theory Arrhenius theory

When KCI dissolves in water __ the K^+ ions are attracted to Cl^- ions on the KCl crystal the Cl^- ions are attracted to the partial negative charge on the oxygen atom of the water molecule the K^+ ions are attracted to the partial negative charge on the oxygen atom of the water molecule the Cl^- ions are attracted to dissolved K^+ ions the K^+ ions are attracted to the partial positive charge on the hydrogen atoms of the water molecule

Which of the following anion is NOT a polyatomic ion? chlorite ion chlorate ion sulfite ion sulfide ion

Match electroytes and nonelectrolytes with their correct descriptions. (i) Instructions Electrolyte square Nonelectrolyte square A substance that produces neutral molecules in aqueous solution A substance that produces ions in aqueous solution