Reactants, Products, & Leftovers

What does the law of conservation of mass state?

• Matter can be created or destroyed in a chemical reaction.

• The total mass of matter before a reaction is different from the total mass after.

• Matter cannot be created or destroyed in a chemical reaction.

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

Tags

NGSS.MS-PS1-5

In the example of burning wood, what are the products formed?

• Ashes, carbon dioxide, and water vapor

• Oxygen and carbon dioxide

• Ashes and oxygen

• Water vapor and oxygen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What represents the reactants in the sandwich-making example?

• Bread and cheese

• Bread and butter

• Cheese and ham

• Bread and lettuce

What does the sandwich represent in the chemical reaction analogy?

• Reactants

• Products

• Leftovers

• Catalyst

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

According to the text, what happens to the mass of wood when it burns?

• It disappears completely.

• It is converted into energy.

• It remains the same as the mass of the products.

• It increases.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is demonstrated by the example of making sandwiches?

• Law of conservation of energy

• Law of conservation of mass

• Law of conservation of momentum

• Law of conservation of charge

Tags

NGSS.MS-PS1-5

What is the main concept discussed in the text?

• Chemical bonding

• Conservation of mass

• Conservation of energy

• Chemical equilibrium

Tags

NGSS.MS-PS1-5

NGSS.MS-PS3-5

What happens to matter during a chemical reaction according to the law of conservation of mass?

• It is destroyed.

• It changes form but the total mass remains the same.

• It is created.

• It disappears.

Tags

NGSS.MS-PS1-5

In the burning wood example, what is the role of oxygen?

• Product

• Reactant

• Catalyst

• Inhibitor

Tags

NGSS.MS-PS1-1

What is the significance of the law of conservation of mass in chemical reactions?

• It allows for the creation of new matter.

• It ensures the mass of reactants equals the mass of products.

• It destroys excess matter.

• It changes the mass of products.

Tags

NGSS.MS-PS1-5