Mastery Machine 8.6E

A student adds 15 g of baking soda to 10 g of vinegar in a beaker. A chemical reaction occurs and a gas is given off. After the reaction, the mass of the products remaining in the beaker is 23 g. Was mass conserved? What was the mass of the gas that escaped?

• Yes, mass was conserved. The mass of the gas that escaped was 2 g.

• No, mass was not conserved. The mass of the gas that escaped was 2 g.

• Yes, mass was conserved. The mass of the gas that escaped was 25 g.

• No, mass was not conserved. The mass of the gas that escaped was 25 g.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A solid mass of 25 g is mixed with 60 g of a solution in a closed system. What is the mass of the products?

• 85 g

• 35 g

• 60 g

• 25 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Balanced or Unbalanced? CH₄ + 2 O₂ → CO₂ + 3 H₂O. Does this equation represent the law of conservation of matter?

• Yes, it is balanced and represents the law of conservation of matter.

• No, it is not balanced and does not represent the law of conservation of matter.

• Yes, it is balanced but does not represent the law of conservation of matter.

• No, it is not balanced but represents the law of conservation of matter.

Tags

NGSS.MS-PS1-5

Does this equation support the law of conservation of matter? 2 HgO → Hg₂ + O₂

• Yes, because the number of atoms of each element is the same on both sides of the equation.

• No, because the number of atoms of each element is not the same on both sides of the equation.

• Yes, because the equation is balanced.

• No, because the equation is not balanced.

Tags

NGSS.MS-PS1-5

A student mixes 125 grams of sugar, 250 grams of water and 5 grams of flavoring. The solution weighs...

• 250 grams

• 380 grams

• 375 grams

• 400 grams

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 will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

• They both will weigh the same
• The product always weighs more than the reactant
• The reactant will weigh more than the product
• They both will loose mass after the reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

________ are the starting substances in a chemical equation.

• Reactants

• Producer

• Reaction

• Products

Tags

NGSS.MS-PS1-1

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-PS1-2

NGSS.MS-PS1-5

If a reaction starts with a total 75g of reactants it should produce 

• a total of 40g of products
• a total of 75g of products
• a total of 180 g of products
• None of the above

Tags

NGSS.MS-PS1-5