Chapter 8 - Chemical Equations and Reactions
In an equation, the symbol for a substance in water solution is followed by...
(aq)
Which coefficients correctly balance the formula equation CaO+H₂O→Ca(OH)₂?
1,1,1
What is the small whole number that appears in front of a formula in a chemical equation?
Coefficient
To balance a chemical equation, it may be necessary to adjust the...
Coefficients
The equation AX+BY→AY+BX is the general equation for a...
Double-displacement reaction
What is the balanced equation for the combustion of sulfur?
S(s)+O₂(g)→SO₂(g)
What is an example of a reaction that does not occur?
2HF(aq)+Cl₂(g)→F₂(g)+2HCl(aq)
When the equation Fe₃O₄+Al→Al₂O₃+Fe is correctly balanced, what is the coefficient of Fe?
9
In the equation 2Al(s)+3Fe(NO₃)₂(aq)→3Fe(s)+2Al(NO₃)₃(aq), iron has been replaced by...
Aluminum
Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?
C+O₂→CO₂
Which observation does not indicate that a chemical reaction has occurred?
Change in total mass of substances
In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is...
H₂
A precipitate may form in a double-displacement reaction when...
Positive ions combine with negative ions.
An active metal and a halogen react to form a...
Salt
The equation A+BX→AX+B is the general equation for a...
Single-displacement reaction
The reaction represented by the equation Mg(s)+2HCl(aq)→H₂(g)+MgCl₂ is a...
Single-displacement reaction
The equation A+X→AX is the general equation for a...
Synthesis reaction
The reaction represented by the equation 2Mg(s)+O₂(g)→2MgO(s) is a...
Synthesis reaction
When a binary compound decomposes, what is produced?
Two elements
In a chemical reaction...
the mass of the reactants equals the mass of the products.