Balancing Equations Unit 4

There are 2 g worth of products in a chemical reaction. How many were needed in the reactant stage

• 2 g

• 13 g

• 6.5 g

• 8 g

What does Law of Conservation say about matter

• That the amount of matter changes in a chemical reaction.

• That the amount of matter doubles in a chemical reaction.

• That the amount of matter stays the same in a chemical reaction.

• That the amount of matter halves in a chemical reaction.

If 45g of reactants go through a reaction how much product will be produced?

• 20g

• 15g

• 35g

• 45g

Ashley was creating a model of this reaction, Na + Cl = NaCl. She used greens to represent Cl and orange to represent Na. How many Oranges will she need in total?

• 1

• 4

• 2

• 3

Tags

NGSS.MS-PS1-1

How is a physical change different from a chemical change?

• There is absolutely no difference
• Chemical changes produce a new substance, physical changes stay the same substance
• Chemical changes create and destroy matter, physical changes don't
• Physical changes create and destroy matter, chemical changes dont

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ca + O₂ --> CaO
What coefficient goes in front of CaO?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

• 2, 2, 1
• 2, 3, 2
• 1, 2, 2
• 1, 3, 1

Tags

NGSS.MS-PS1-5

The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge

Which of these is not a chemical reaction?

• Burning of wood
• Milk going bad
• Mixing vinegar and baking soda
• Melting of ice

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5