Chemistry Exam Review #1

Front

What is the name of the compound with the chemical formula CrCl3?

Back

chromium(III) chloride

Front

What happens to heat in a closed system during an exothermic reaction in an aqueous solution?

Back

Heat is transferred from the reactants to the water.

Front

How do you calculate the number of moles of a gas in a container?

Back

Use the ideal gas law: PV = nRT, where P is pressure, V is volume, n is moles, R is the gas constant, and T is temperature.

Front

What does a heating curve represent?

Back

A heating curve shows the phase changes of a substance as it is heated, indicating solid, liquid, and gas phases.

Front

What is the chemical formula for magnesium iodide?

Back

MgI2

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings.

Front

What is the significance of the phase diagram in chemistry?

Back

A phase diagram shows the states of matter (solid, liquid, gas) of a substance at different temperatures and pressures.

Front

What is the definition of a closed system in thermodynamics?

Back

A closed system can exchange energy (as heat or work) but not matter with its surroundings.

Front

What is the difference between ionic and covalent compounds?

Back

Ionic compounds are formed by the transfer of electrons, while covalent compounds are formed by the sharing of electrons.

Front

What is the molar volume of an ideal gas at standard temperature and pressure (STP)?

Back

22.4 L/mol.