Balancing Equations and Chemical Reactions

Predict the products of the chemical reaction shown below?

NaBr + CaF₂ → _________ + __________

• Na2Ca + FBr

• NaF + CaBr2

• NaBr + F2Ca

• BrNa + CaF2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the chemical formula for the compound formed by calcium ions and chlorine ions?

• Ca₂Cl

• Ca₂Cl₇

• Ca₇Cl₂

• CaCl₂

Tags

NGSS.MS-PS1-1

Predict the products for the chemical reaction shown below.

Zn + HCl → ____ + ___  

• H2 + ZnCl2 

• ZnCl2 + H2 

• ZnH2 + Cl2

• ZnClH2

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A balanced equation is shown below.

C₆H₁₂O₆ (l) → 2C₂H₅OH (l) + 2CO₂ (g)

Which of the following statements correctly explains why the equation is balanced?

• Because it has coefficients 

• Because mass is conserved on both sides

• Because Carbon is conserved on both sides

• Because the products and reactants are made of the same types of elements

Tags

NGSS.MS-PS1-5

Write the following chemical equation for the following reaction.  Use the appropriate chemical symbols and charges.

Silver reacts with carbonate (CO3) to produce silver oxide and carbon dioxide

• S + CO₂ → SCO₂

• Ag + CO₃ → AgO + CO₂

• AgCO₃ → S + CO₂

• AgCO₃ → AgO + CO₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT a balanced equation? 

• N₂ + 3H₂ → 2NH3(g)

• SiO₂ + 2C(s) →   Si(l ) + 2CO(g)

• SnO₂ + 2 H₂ → Sn + 2 H₂O

• TiCl₄ + 2 H₂O → TiO₂ + 2 HCl

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Hydrazine (N₂H₄) and dinitrogen tetroxide (N₂O₄ ) react to form gaseous nitrogen and water. Which equation below represents the chemical reaction described?  

• N₂H₄  +  N₂O₄ → H₂  +  O₂

• N₂H₄  +  N₂O₄ → H₂  +  N₂

• N₂H₄  +  N₂O₄ → H₂O  +  N₂

• N₂H₄  +  N₂O₄ → H₂O  +  O₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When the reaction below is completely balanced, what will the coefficient for NH3 be?

___NH₃ + ___O₂→ ___N₂ + ___ H₂O

• 4

• 3

• 2

• 1

Tags

NGSS.HS-PS1-7

A student places some baking soda and a jar of lemon juice in a plastic bag and seals the bag. She weighs the bag and everything in it. She shakes the bag so the lemon juice spills out of the jar and mixes with baking soda inside the bag. The student observes that bubbles form and the bag expands. If the student weighs the bag and everything in it after the bubbling stops and compares the final weight to the starting weight, what will she find out?

• The “after” mass will be more

• The “after” mass will be less

• The two masses will be the same

• There is no way to tell. 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In an experiment, 2.54 grams of Sodium completely reacts with 2.54 grams of fluorine, producing 3.00 grams of Sodium fluoride. What is the balanced chemical equation for this reaction?

• Na + F₂ → NaF

• 2Na  + F₂ → NaF

• 2Na + 2F₂ → 2NaF

• 2Na  + F₂ → 2NaF

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5