5.12

What is the balanced form of the equation C2H6 + O2→CO2+H2O ?

2C2H6 + 7O2→4CO2+6H2O

Which equation is balanced?

4P+5O2→2P2O5

When calcium (Ca) is mixed with hydrochloric acid (HCl), a single-displacement reaction occurs. What will be the product or products?

CaCl2+H2

Which phrase is the best description of a redox reaction?

a reaction in which the exchange of electrons (or oxygen) occurs

Carbon and oxygen combine to form carbon dioxide. What are the reactants, or what is the reactant, in this chemical reaction?

carbon and oxygen

Methane burns in oxygen to yield carbon dioxide and water. The chemical formula for this reaction is CH4+2O2→CO2+2H2O. What is the product, or what are the products, of this reaction?

carbon dioxide and water

MnSO4→MnO+SO3 is not a synthesis reaction. What type of reaction is it?

decomposition

Which reaction is essentially the opposite of a synthesis reaction?

decomposition

Na2S (aq) + Cd(NO3)2(aq)→CdS (s) + 2NaNO3(aq) ​ is which type of reaction?

double-displacement

What is usually released in a combustion reaction?

energy

The equation 2NaNO3 + CaCl2→2NaCl+Ca(NO3)2 is balanced. How many atoms of sodium (Na) are there on either side of the equation?

two

Why does the reaction H2O + Au→no reaction not proceed to a product?

Gold has a lower activity than hydrogen and cannot replace it.

Which example best describes a double displacement reaction?

The ions of two ionic compounds switch places and a gas is formed.

What does the law of conservation of mass say

The mass of the products in a chemical reaction is equal to the mass of the reactants.

Which sentence best describes why MnSO4→MnO+SO3 is not a synthesis reaction?

The reaction has more than one product.

Which action defines a double-displacement reaction?

formation of a precipitate

2H2O + 2K (s)→2KOH (l) + 2H2(g) is an example of which type of reaction?

single-displacement

Which phrase describes how some redox reactions are also classified?

single-displacement

Hydrogen, when combined with nitrogen in a chemical reaction, forms ammonia. Which type of chemical reaction is this an example of?

synthesis

What type of chemical reaction is 4Fe+3O2→2Fe2O3?

synthesis