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New YorkChemistry

Physical Behavior of Matter

6 dot points across 6 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do you express the concentration of a solution as molarity, parts per million or percent by mass?

Concentration and molarity: calculate molarity, parts per million and percent by mass using the concentration formulas on Table T.
A focused Regents Chemistry answer on solution concentration: molarity as moles of solute per liter of solution, parts per million, and percent by mass, all from the Table T formulas, with worked calculations and the dilution idea.
9 min answer →

How do you calculate the heat absorbed or released when a substance warms, melts or boils?

Heat and calorimetry: calculate heat changes using q = mC(delta-T) for temperature changes and q = mH for phase changes, with constants from Table B and formulas from Table T.
A focused Regents Chemistry answer on heat and calorimetry: the q = mC(delta-T) equation for warming or cooling, q = mH for melting and boiling, the water constants on Table B, and the difference between exothermic and endothermic changes.
9 min answer →

What is happening to a substance's energy and particles at each stage of a heating curve?

Heating and cooling curves: interpret heating and cooling curves, distinguishing changes in kinetic energy from changes in potential energy during phase changes.
A focused Regents Chemistry answer on heating and cooling curves: why temperature is constant during a phase change, how kinetic and potential energy change in each segment, and how to read melting and boiling plateaus from the graph.
9 min answer →

How do you read a solubility curve, and what makes a solution saturated, unsaturated or supersaturated?

Solutions and solubility curves: classify solutions as unsaturated, saturated or supersaturated, and use the Table G solubility curves to determine how much solute dissolves at a given temperature.
A focused Regents Chemistry answer on solutions and the Table G solubility curves: solute and solvent, saturated, unsaturated and supersaturated solutions, the factors that affect solubility, and how to read grams of solute per 100 g of water from the curve.
9 min answer →

How does the kinetic molecular theory explain the differences between solids, liquids and gases?

States of matter and kinetic molecular theory: describe the particle arrangement and energy in solids, liquids and gases, and state the assumptions of the kinetic molecular theory of an ideal gas.
A focused Regents Chemistry answer on the three states of matter and kinetic molecular theory: how particle arrangement and motion differ across solids, liquids and gases, the assumptions of an ideal gas, and how real gases deviate from ideal behavior.
9 min answer →

How do pressure, volume and temperature of a gas relate, and how do you use the combined gas law?

The gas laws: use the combined gas law to relate the pressure, volume and Kelvin temperature of a fixed mass of gas, with STP from Table A.
A focused Regents Chemistry answer on the gas laws: the qualitative pressure-volume and volume-temperature relationships, the combined gas law from Table T, the use of Kelvin temperature, and STP values from Table A, with a worked calculation.
9 min answer →