Which of the following steps can be used to identify a single replacement reaction a) check whether the products are salt and water. b) check whether the reactants are an acid and a base. c) check if the irons of two compounds exchange places. d) check if one element replaces another element in a compound.

Option D :- check if one element replaces another element in a compound.

Explanation:

A single-displacement reaction occurs when an element replaces another element in a compound. A metal only replaces a metal, and a nonmetal only replaces a nonmetal.

 D) check if one element replaces another element in a compound.

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

A double displacement reaction is one in which exchange of ions take place.

A neutralization is a chemical reaction in which an acid reacts with the bas to form salt and water.

A) check whether the products are salt and water- neutralization

B) check whether the reactants are an acid and a base: neutralization

C) check if the irons of two compounds exchange places: Double displacement

D) check if one element replaces another element in a compound: single replacement

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles