The color change that occurs when iron rusts is evidence of a(n)
The following reaction is considered to be what? Zn + 2HCl --- ZnCl + H
A reaction that combines simpler reactants to form a new compound is called a
Which statement reflects the law of conservation of mass?
In the chemical equation 2H2 + O2 -- 2H2O, what is 2H2 considered?
In the equation N2 + 3H2 -- 2NH3, the coefficient of the hydrogen reactant is
Most living things obtain energy through a process that is very similar to a combustion reaction. This process is called
The breakdown of water molecules (H2O) into hydrogen (H2) and oxygen (O2) molecules is an example of a
To balance a chemical equation, you can change
In the chemical equation 2H2 + O2 -- 2H2O, the arrow indicates
Which of the following best describes an endothermic reaction?
Which of the following best describes an exothermic reaction?
A mixture where you can see the different parts is called
A mixture where you cannot see the parts is called
C6H12O6 + 6O2 ---- 6CO2 + 6H2O + ATP is which equation
6CO2 + 6H2O +energy----- C6H12O6 + 6O2 is which equation
Is this equation balanced? CF4 + 2Br2 ---- CBr4 + 2F2
Is this equation balanced? N2 + H2 ---- NH3
Which of the following DOES NOT affect the rate of a chemical change
Baking bread is a ___________ change
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