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Twelfth Grade (Grade 12) Reactions Questions

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Grade 12 Reactions
Which among these catalyze reactions by lowering the activation energy?
  1. proteins
  2. enzymes
  3. carbohydrates
  4. steroids
Grade 12 Reactions
Which of the following properly completes the following chemical equation: [math]SiO_2 + 2Mg[/math] [math]rarr[/math][math][/math]?
  1. Si + 2MgO
  2. [math]Si_2O + Mg[/math]
  3. [math]SiO_2 + Mg_2O[/math]
  4. [math]Si + MgO_2[/math]
Grade 12 Reactions
Which of the following is not evidence of a chemical reaction?
  1. spoiled milk
  2. color change
  3. rust
  4. melting
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