PS.3D Modeling Conservation of Mass

A chemical reaction is balanced when

• both sides have the same elements

• Both sides have the same  number of atoms

• Same subscripts

• Same coefficients

Tags

NGSS.MS-PS1-5

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

Tags

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

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

• Originator

• Reactant

• Product

• Produce

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?

• 50 g
• 100 g
• 200 g
• 400 g

Tags

NGSS.MS-PS1-4

Does the equation H₂+O₂ →H₂O follow the Law of Conservation of Mass?

• Yes, because the atoms are equal.

• No, because more info is needed.

• No, because there are more atoms in the product.

• No, because there are more atoms in the reactant.

Tags

NGSS.MS-PS1-5

How many grams of OXYGEN would be needed to show conservation of mass in the example below?

• 100 g

• 93 g

• 7 g

• 0 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many grams of CHOCOLATE POWDER are shown in the example of conservation of mass below?

• 450 g

• 465 g

• 0 g

• 15 g

Tags

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

Tags

NGSS.MS-PS1-5

Which Chemical Equation is Balanced?

• CH₄+O₂------CO₂+2H₂O

• H₂+O₂-----2H₂O₄

• 4Al+3O₂-----2Al₂O₃

Tags

NGSS.MS-PS1-5