NGSS.MS-PS1-5

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.
  

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NGSS.MS-PS1-5

What is the law of conservation of matter?

• Matter changes when reacted or changed.
• The mass of all reactants are changed during a physical or chemical change.
• The mass of the reactants is the same as the mass of the products.
• The mass of the products is different than the mass of the reactants.

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NGSS.MS-PS1-5

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• No!

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NGSS.MS-PS1-5

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 

• 4g
• 5g
• 9g
• 14g

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NGSS.MS-PS1-5

S8P1f Look at the incomplete chemical equation: Ca + Cl₂ --> ?

The reactants are shown. How many chlorine (Cl) atoms must be present in the product that forms this reaction?

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-5

2Al + 6HCl --> 2AlCl₃ + 3H₂

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

• 13

• 8.8

• 0.99

• 1.0

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NGSS.MS-PS1-5

How many Oxygen atoms are present in the product of the following equation: 2SO₂ + 2H₂O₂ ----> 2H₂SO₄

• 2

• 3

• 4

• 8

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NGSS.MS-PS1-5

What does the Law of Conservation of Mass say? It says,

"During a chemical reaction, mass is neither _______ or destroyed."

• burned

• created

• melted

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NGSS.MS-PS1-5

In chemical reactions, what does the law of conservation of matter mean?

• Matter is not created or destroyed; only changed.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not changed.

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NGSS.MS-PS1-5

Identify if the following equation is unbalanced or balanced.

O₃+2C→3OC

• Unbalanced

• Balanced

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NGSS.MS-PS1-5