Core UNIT 1.1 Review: The Law Conservation of Matter

Law of conservation of mass states that 

• matter is created
• matter is destroyed
• matter is neither created nor destroyed
• matter does not change

10g of white powder reacts with 10g of clear liquid. The reaction bubbles and changes color producing a black liquid that has a mass of 13g. What can be concluded?

• 5g of gas was produced
• This experiment violates the conservation of mass
• 7g of gas was produced
• The excess reactant is destroyed & disappears during the reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Bob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?

• 200 g
• 700 g
• 1,100 g

Tags

NGSS.MS-PS1-4

What will weigh more when a chemical change is complete assuming a closed system? 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

Suppose a reaction were to happen in an open container in a lab.  During the reaction, the scientist observes the chemicals bubble, and produce a gas.   During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g.  Explain what happened.  

• His chemical reaction defied the law of conservation of mass
• The product destroyed mass during the reaction
• The reactants created matter during the reaction
• The gas that was produced was not able to be weighed since the container was open.  

Can matter be created or destroyed?

• Yes, it can be created.
• Yes, it can be destroyed.
• No, matter is always conserved
• None of these

Matter is anything that

• takes up space and has mass.
• is in our universe.
• is light, sound or ideas.

An oreo cookie weighs 20 grams.  It gets crushed into crumbs for a recipe.  How much do its crumbs weigh?

• 15 grams
• 25 grams
• 20 grams

Mrs. Roth's tea cup and hot tea weigh 100 grams. She stirs in 10 grams of sugar. How much is the total amount of matter in Mrs. Roth's tea cup and tea now?

• 100 grams

• 110 grams

• 90 grams

A boiling pot of water on a stove is what type of system

• Closed System

• Open System

• Isolated System