Unit 4 NonCyclic

Front

What is the coefficient in the balanced equation for PCl5 + _ H2O → _ HCl + H3PO4?

Back

4, 5

Front

What is the correct unbalanced equation for burning solid magnesium in oxygen gas?

Back

Mg + O2 → MgO (s)

Front

If an element is diatomic, what should its subscript be when it is by itself?

Back

2, only when it is by itself

Front

What is the balanced equation for the decomposition of ZnS?

Back

ZnS → Zn + S

Front

What is the name for Hg2S?

Back

mercury (I) sulfide

Front

What is the definition of a diatomic molecule?

Back

A molecule composed of two atoms, which can be of the same or different chemical elements.

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance involved in a reaction.

Front

What does the (s) symbol indicate in a chemical equation?

Back

It indicates that the substance is in solid state.

Front

What is the purpose of balancing a chemical equation?

Back

To ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is the difference between a reactant and a product in a chemical reaction?

Back

Reactants are substances that start a chemical reaction, while products are substances formed as a result of the reaction.