Reactions - bal, types, mol-mol stoich

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ → Fe₂O₃

• 4Fe + 3O₂ 
   → 2Fe₂O₃
• 2 Fe + 3O₂ 
  → Fe₂O₆
• 4 Fe + O₆ 
  → 2Fe₂O₃
• Fe + O₂ 
  → Fe₂O₃

Tags

NGSS.MS-PS1-5

What is the total number of atoms in  5Na₃PO₄?

• 5
• 40
• 55
• 60

Tags

NGSS.MS-PS1-1

What is the arrow in a chemical equation?  →

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What kind of reaction is this?
Mn + 2 HNO₃ → Mn(NO₃)₂ + H₂

• synthesis
• decomposition
• single displacement
• double displacement

Which kind of reaction is this? H₂CO₃ → H₂O + CO₂

• synthesis
• decomposition
• single displacement
• double displacement

What are the products of all hydrocarbon combustion reactions?

• → CO₂ + H₂O
• → CO + H₂O
• → CaC₂ + CO
• → 2 H₂O

Which of these is NOT conserved when a chemical equation is balanced?

• atoms
• mass 
• moles
• all of these are conserved

Tags

NGSS.MS-PS1-5

If 1 gram of sugar is dissolved in 125 grams of water, what is the mass of the solution.

• a little less than 125 grams
• 126 grams
• more than 125 grams but less than 126 grams
• 124 grams

Tags

NGSS.MS-PS1-5

2 Fe₂O₃(s) + 3 C(s) → 4 Fe(s) + 3 CO₂(g)

How many moles of iron will be produced if 6 moles of Carbon react completly?

• 4 moles

• 6 moles

• 7 moles

• 8 moles

Tags

NGSS.HS-PS1-7

Copper(II) chloride and aluminum react to produce aluminum chloride and copper. Which of the following is the correctly balanced chemical equation for this reaction?

• CuCl₂ + Al → AlCl₃ + Cu

• 3CuCl₂ + Al → AlCl₃ + 2Cu

• 3CuCl₂ + 2Al → 2AlCl₃ + 3Cu

• CuCl₂ + 3Al → AlCl₃ + 2Cu

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2