chem ch 8 a

You mix solution A with solution B in a beaker. Which of the following observations does NOT help you prove that a chemical reaction has occurred?

None of the above; all help prove that a chemical reaction has occurred

In the reaction described by the word equation- sodium + water yields sodium hydroxide +hydrogen gas

water is a reactant

Which of the following indicates that a chemical equation is balanced?

The numbers of atoms of each element are the same on both sides of the equation

From a complete and correctly written chemical equation, you can obtain the

all of the above

To balance a chemical equation after you have written the correct formula for all of the reactants, you must

adjust the coefficients

The formation of a solid product in a chemical reaction is represented by the symbol

(s)

What symbol indicates a reversible reaction?

(the opposite arrows on top of each other)

A _______ speeds up a reaction but is not used up in the process

catalyst

In the expression 3CO2, the numbers 3 and 2, respectively,

a coefficient and a subscript

What is the total number of atoms that is represented by the following chemical equation?- NH4NO2 yields N2 + 2H2O

16

Which equation below violates the law of conservation of mass (is not balanced)?

KCL + BR yields KBR + CL2

In which type of reaction do two or more compounds react to form one product?

synthesis

Which of the following is true regarding single-displacement reactions?

one element replaces another in a compound

Which of the following is true regarding double-displacement reactions?

the ions of the two reactants must be exchanged

A mixture of propane (C3H8) and oxygen react to form carbon dioxide and water. What type of chemical reaction is this?

combustion

In what type of reaction does a single reactant form more than one product when heat or electricity is added?

decomposition

What type of chemical reaction is represented by the following word equation? iron + oxygen yields Iron (II) oxide

synthesis

In a single-displacement reaction, an element in the activity series most likely can replace any element

below it on the list

The activity series helps to predict

whether or not a specific chemical reaction is possible

CH4(g) +2O2(g) yields CO2(g) +2H20(g)

combustion

Zn(s) + Pb(NO3)2(aq) yields Zn(NO3)2(aq)+Pb(s)

single displacement

2HBr(aq) yields H2(g)+Br2(l)

decomposition

2K(s)+Cl2(g) yields 2KCl(s)

synthesis

Na2S(aq)+Ba(NO3)2(aq) yields 2NaNO3(aq)+BaS(s)

double displacement

gas=

(g)

liquid=

(l)

aqueous solution=

(aq)

solid=

(s)

heat=

(the triangle)

catalyst=

(yielding sign with equation)

yields=

yield sign