SE Review - All Topics

Front

What is electronegativity?

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. It is often used to predict how atoms will interact in chemical bonds.

Front

List the elements in order of increasing electronegativity: Cs, Rb, Ca, Mg.

Back

The order from lowest to highest electronegativity is: Cs, Rb, Ca, Mg.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that can be physically separated. Examples include air, salad, and sand and salt.

Front

What are indicators of a chemical reaction?

Back

Indicators of a chemical reaction include the production of heat or light, a color change, and the production of gas bubbles.

Front

Which of the following is NOT an indicator of a chemical reaction: production of heat, color change, gas bubbles, or dissolving?

Back

Dissolving one substance in another is NOT an indicator of a chemical reaction.

Front

What environmental element assists rusting?

Back

Oxygen is the environmental element that assists in the rusting of iron.

Front

What happens to hydrogen peroxide during decomposition?

Back

Hydrogen peroxide breaks down into water and oxygen gas.

Front

What observation indicates a chemical reaction has occurred when hydrogen peroxide decomposes?

Back

An increase in temperature indicates that a chemical reaction has occurred.

Front

Define a chemical reaction.

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another, involving the breaking and forming of bonds.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements are chemically bonded together, while a mixture is a combination of substances that retain their individual properties.