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Ninth Grade (Grade 9) Reactions Questions

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Grade 9 Reactions
Grade 9 Reactions
Which of the following is a balanced equation?
  1. [math]3 N_2 + 3 H_2[/math] [math]rarr[/math] [math]2 NH_3[/math]
  2. [math] 4 Al + 6 HCl [/math] [math]rarr[/math] [math] 3 H_2 + 2 AlCl_3 [/math]
  3. [math]2 O_2 + 3 H_2[/math] [math]rarr[/math] [math] 2 H_2O[/math]
  4. [math]2 K + Cl_2[/math] [math]rarr[/math] [math]2 KCl[/math]
Grade 9 Reactions
Which of the following is a balanced equation?
  1. [math]3 N_2 + 3 H_2[/math] [math]rarr[/math] [math]2 NH_3[/math]
  2. [math]2 O_2 + 3 H_2[/math] [math]rarr[/math] [math] 2 H_2O[/math]
  3. [math]2 K + Cl_2[/math] [math]rarr[/math] [math]2 KCl[/math]
Grade 9 Reactions
Which cannot take place during a chemical reaction?
  1. Formation of new atoms
  2. Bonds breaking between atoms
  3. Formation of new molecules
  4. Bonds forming between atoms
Grade 9 Reactions
Identify the reactant(s) in the chemical reaction: [math]CO_2 + H_2O rarr H_2CO_3[/math].
  1. [math]CO_2[/math]
  2. [math]CO_2 and H_2O[/math]
  3. [math]CO_2, H_2O, and H_2CO_3[/math]
  4. [math]H_2CO_3[/math]
Grade 9 Reactions
What is the type of the reaction below?

[math]2Fe + O_2 rarr 2FeO[/math]
  1. Decomposition
  2. Synthesis
  3. Single displacement
  4. Double displacement
Grade 9 Reactions
Which is an example of a chemical reaction?
  1. ice melting
  2. wood burning
  3. glass breaking
  4. sugar dissolving in water
Grade 9 Reactions
Identify the reactant(s) in the chemical reaction: [math]CO_2 + H_2O rarr H_2CO_3[/math].
  1. [math]CO_2 and H_2O[/math]
  2. [math]CO_2, H_2O, and H_2CO_3[/math]
  3. [math]H_2CO_3[/math]
Grade 9 Reactions
Which of the following is NOT a sign of a chemical change occurring?
  1. change in color
  2. new substance is produced
  3. change in size
  4. hard to reverse
Grade 9 Reactions
Which is an example of a chemical reaction?
  1. ice melting
  2. wood burning
  3. sugar dissolving in water
Grade 9 Reactions
When a base is dissolved in water, what is released?
  1. [math]H^+[/math]
  2. [math]Na^+[/math]
  3. [math]OH^-[/math]
  4. [math]CO_2[/math]
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