Physical Science Chemistry Review

Front

What are reactants in a chemical equation?

Back

Reactants are the substances that undergo a chemical change in a reaction. In the equation 2Mg + O2 -> 2MgO, the reactants are Mg and O.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout. An example is Pepsi, which is a homogeneous mixture.

Front

What is an inference?

Back

An inference is a conclusion drawn from evidence or reasoning rather than from explicit statements. For example, if a van is at a fast-food restaurant, one might infer that the driver was hungry.

Front

What forms covalent bonds in chemical compounds?

Back

Covalent bonds form when pairs of electrons are shared between two nonmetal atoms.

Front

What is an independent variable in an experiment?

Back

An independent variable is the factor that is changed or controlled in a scientific experiment to test its effects on the dependent variable. In the plant experiment, the type of liquid is the independent variable.

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties.

Front

What is the difference between a compound and a mixture?

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A compound is a substance formed when two or more elements are chemically bonded together, while a mixture is a physical combination of substances.

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What is electronegativity?

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

Front

What is a chemical bond?

Back

A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds.