Conservation of Mass and Balancing Equations

reactants → products

Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

• The mass of the reactants equals the mass of the products.

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

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

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

Tags

SPS3a

Which of the following reactions shows the law of conservation  of mass with propane (C₃H₈) reacting with oxygen (O₂) to form carbon dioxide and water? 

• 
• 
• 
• 

Tags

SPS3b

Is this equation balanced?

• yes

• no

• Not enough information

Tags

NGSS.MS-PS1-5

Is this equation balanced?

• yes

• no

• Not enough information

Tags

NGSS.MS-PS1-5

The number and type of atoms on each side of a chemical equations must be

• equal

• different

• doubled

• tripled

Tags

NGSS.MS-PS1-5

A sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red.  What is the mass of products? 

• Mass is less than 13 grams

• Mass is equal to 13 grams

• Mass is greater than 13 grams

• Mass cannot be measured

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.

• Matter can only be lost in a chemical reaction.

• Matter can only be gained in a chemical reaction.

• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.MS-PS1-5

What does the Law of Conservation of Mass state? Choose all that are true

• Matter cannot be gained or lost in a chemical reaction.

• In a closed system, the total mass of all reactants must equal the total mass of all reactants

• In an open system, the mass of reactants and products will be equal.

• The reactant molecules will contain the same numbers and types of atoms as the product molecules.

Tags

NGSS.MS-PS1-5

According to the Law of Conservation of Mass (Matter), Matter cannot be ​ (a)   or ​ (b)   , it can only be ​ (c)   . This means however many atoms of an element we have before a reaction must be ​ (d)   to the number after a reaction.

• created

• destroyed

• changed

• equal

• unequal

Tags

NGSS.MS-PS1-5

When CaCO₃ is heated, it forms CaO and CO₂. Which of these statements best describes the mass of the products if 100 g of CaCO₃ is heated?

• The difference in the products’ masses is equal to the mass of the CaCO₃

• The sum of the products’ masses is less than the mass of the CaCO₃

• The mass of each product is equal to the mass of the CaCO₃

• The sum of the products’ masses equals the mass of the CaCO₃

Tags

NGSS.MS-PS1-5