Which of the following substance is not an acid? 1. Substance A is tested and found to have a pH of 3. 2. Substance B, a common food, tastes sour. 3. Substance C causes metals to corrode. 4. Substance D feels slippery in solution.

Which statement correctly describes a physical change? a. involves breaking and creating chemical bonds but not changing a phase b. may involve a change in phase but does not involve a change in the molecular structure c.

When 4.0 mol H2O react with 4.0 mol Al in the reaction below, 2.7 mol of Al are used up in the reaction. How many moles of Al are left over unreacted? 2 Al + 3 H2O → Al2O3 + 3H2 (C?) 2.7 mol Al left over 2.0 mol Al left over 1.3 mol Al left over 0.

Which of the following errors could cause your percent yield to be falsely high, or even over 100%? Select ALL that apply. A.) Heating the sample too vigorously. B.) Handling the crucible directly with your hands. C.

Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?

The charges of a set of isoelectronic ions vary from 3 + to 3-. Place the ions in order of increasing size.

Which of the following experimental observations proved that the idea of matter and mass being evenly distributed in an atom was flawed? A. Less than 1% of the alpha particles went un-deflected through the gold foil. B.

Calculate the energy E of a sample of 3.50 mol of ideal oxygen gas (O2) molecules at a temperature of 310 K. Assume that the molecules are free to rotate and move in three dimensions, but ignore vibrations.

Gasohol is a fuel containing ethanol (c2h6o) that burns in oxygen (o2) to give carbon dioxide and water.

What type of rock does the ocean floor consist of? 1 Igneous basalt rock 2 Igneous granite rock 3 Sedimentary rock 4 Metamorphic rock

Consider the combustion of liquid methanol, ch3oh (l) : ch3oh (l) + 3/2o2 (g) →co2 (g) + 2h2o (l) δh=-726.5kj part a what is the enthalpy change for the reverse reaction?