Chemical Formulas & Reactions Review

Chemical reactions...

• occur only in living organisms.
• create and destroy atoms
• only occur outside living organisms
• produce new substances. 

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-5

When the symbol Δ is placed over the yields sign in a chemical reaction it means...?

• Heat is supplied to the reaction
• a catalyst is needed
• yields 
• precipitate

Chemical equations...

• describe chemical reactions
• show how to write chemical formulas
• give directions for naming chemical compounds
• describe only biological changes

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-1

Symbols used in equations, together with the explanations of the symbols. are shown below. Which set is correct?

• (g) grams
• (l) liters
• (aq) dissolved in water
• (s) solid product

In the chemical equation
H₂O₂(aq)→H₂O(l) + O₂(g)
 the O₂ is a 

• Catalyst 
• Solid
• Product
• Reactant

The symbol  ↔ indicates that...

• heat must be applied
• an incomplete combustion reaction has occured
• a gas is formed by the reaction
• the reaction is reversible 

A catalyst is 

• the product of a combustion reaction
• not used up in a reaction
• on of the reactants in single-replacement reactions
• a solid product of a reaction

Tags

NGSS.HS-PS1-5

If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be?
nitrogen trifuoride→nitrogen + fluorine

• 6F₂
• F₃
• 6F
• 3F₂

Tags

NGSS.HS-PS1-7

What are the coefficients that will balance the skeleton equation below?
AlCl₃ + NaOH→ Al(OH)₃ + NaCl

• 1,3,1,3
• 3,1,3,1
• 1,1,1,3
• 1,3,3,1

Tags

NGSS.HS-PS1-7

When the equation
Fe + Cl₂→ FeCl₃
is balanced, what is the coefficient for Cl₂?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-7