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Questions in chemistry
📝 Answered - A disturbance in matter that carries energy from one place to another is called a wave.
📝 Answered - How much heat is given off when 8 g of hydrogen reacts in the reaction: \[ 2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}; \Delta H = -115.60 \text{kcal} \] a. -57.8 kcal b. -115.6 kcal c. -173.4 kcal d. -231.2 kcal e. -462.4 kcal
📝 Answered - Balance the equation: \(...NO_2 + ...O_2 + ...H_2O = ...HNO_3\)
📝 Answered - Electrolysis of a dilute solution of aqueous sodium chloride results in the cathode product: A. Sodium B. Hydrogen C. Chlorine D. Oxygen E. Peroxide
📝 Answered - Which of the following tends to form a cation (positive ion) with a charge of 2+? A. Na B. O C. He D. Mg
📝 Answered - How many moles of sodium hydroxide are produced when 1.00 mol of sodium peroxide reacts with water?
📝 Answered - A test tube containing CaCO₃ is heated until the entire compound decomposes. If the test tube plus calcium carbonate originally weighed 30.08 grams and the loss of mass during the experiment was 4.40 grams, what was the approximate mass of the empty test tube? A. 20.08 g B. 21.00 g C. 24.50 g D. 25.08 g E. 25.68 g
📝 Answered - Which describes a spontaneous reaction? A. Positive ΔH B. Negative ΔH C. Positive ΔG D. Negative ΔG E. Positive ΔS
📝 Answered - You fill a balloon with 2.50 moles of gas at 25°C at a pressure of 1.49 atm. What is the volume of the balloon?
📝 Answered - What are two ways in which the sun's energy can be captured and used? How can both be used in a home?
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