Law of Conservation of Matter
Authored by Kristi Goodwin
Chemistry
8th Grade
NGSS covered
Used 620+ times
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About
This quiz focuses on the law of conservation of matter/mass and basic chemical equation interpretation, making it appropriate for 8th grade physical science or introductory chemistry. Students need to understand that matter cannot be created or destroyed during chemical reactions, only rearranged, meaning the total mass of reactants always equals the total mass of products. The questions require students to apply this principle through mathematical calculations involving mass changes, analyze scenarios where gas production might make it appear that mass is lost, and identify when experimental results seem to violate conservation laws due to unmeasured components. Students must also demonstrate foundational chemistry vocabulary by distinguishing between reactants and products in chemical equations, counting atoms in chemical formulas, and recognizing that atom conservation is the underlying reason for mass conservation. Created by Kristi Goodwin, a Chemistry teacher in the US who teaches grade 8. This quiz serves as an excellent formative assessment tool to gauge student understanding before moving into more complex topics like chemical equation balancing and stoichiometry. Teachers can use this as a warm-up activity to activate prior knowledge, assign it as homework to reinforce classroom instruction, or implement it as a review before unit assessments. The variety of question types—from direct recall of the law's definition to application problems involving mass calculations—makes it particularly valuable for identifying misconceptions about matter conservation in both open and closed systems. The quiz aligns with NGSS MS-PS1-5, which requires students to develop and use models to describe how the total number of atoms does not change in a chemical reaction, supporting the law that matter is conserved.
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16 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Law of conservation of mass states that
Tags
NGSS.MS-PS1-5
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
True or false. Law of conservation of mass means that the number of atoms of the products is more than the number of atoms in the reactants.
Tags
NGSS.MS-PS1-5
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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?
Tags
NGSS.MS-PS1-4
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the law of conservation of mass?
Tags
NGSS.MS-PS1-5
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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.
Tags
NGSS.MS-PS1-5
NGSS.MS-PS1-2
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
If reaction starts with 20g of reactants it should produce...
Tags
NGSS.MS-PS1-5
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
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?
Tags
NGSS.MS-PS1-5
NGSS.MS-PS1-2
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