Chapter 8: Evidence of Chemical Reactions

What is the name of the substances that participate in a chemical reaction?

• products
• reactants
• catalysts
• intermediates

Which of the following is NOT evidence that that a chemical reaction has occurred?

• produces light/heat
• production of a gas
• formation of a precipitate
• melting

Tags

NGSS.MS-PS1-2

Which physical state indicates that a substance has been dissolved in water?

• (aq)
• (g)
• (l)
• (s)

A double arrow indicates that there is equilibrium between reactants and products.

• True
• False

Tags

NGSS.HS-PS1-6

If a catalyst is required n a chemical reaction, where do you write it?

• Under the arrow
• On the reactants side
• Above the arrow
• On the products side

When should you write the temperature or pressure above the arrow in a chemical reaction?

• When it is at standard temp/pressure
• When it is not at standard temp/pressure
• When the pressure is 1 atm
• When the temperature is 0 degrees C

How do you balance a chemical equation?

• Add coefficients by trial/error
• Change subscripts
• Change superscripts
• You can't balance equations

Write the balanced chemical equation for the following unbalanced equation: Fe + Cl₂ → FeCl₃

• Fe + Cl₂ → FeCl₃
• Fe + 3Cl₂ → 2FeCl₃
• 2Fe + Cl₂ → FeCl₃
• 2Fe  3Cl₂ → 2FeCl₃