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

The product always weighs more than the reactant

The reactant will weigh more than the product

They both will loose mass after the reaction

What is the Law of Conservation of mass?

Mass is never created or destroyed

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

Students react baking soda & vinegar. Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.

Bubbles were produced during the reaction, which meant that a gas was being produced.

The plastic bag did not change in any way, indicating that it was not involved in the reaction.

The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

When CaCO 3 is heated, it forms CaO and CO 2 . Which of these statements best describes the mass of the products if 100 g of CaCO 3 is heated?

The sum of the products’ masses equals the mass of the CaCO 3

The difference in the products’ masses is equal to the mass of the CaCO 3

The sum of the products’ masses is less than the mass of the CaCO 3

The mass of each product is equal to the mass of the CaCO 3

A group of atoms bonded together

Basic unit of a chemical element

Law of conservation of mass

Quiz

•

Science, Other

•

7th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-PS1-5, MS-PS1-2, MS-PS1-1

+1

Standards-aligned

Kevin Simmons

Used 728+ times

FREE Resource

About this resource

Discover the fascinating world of chemistry with our comprehensive 7th-grade science quiz on the Law of Conservation of Mass, crafted by the insightful Kevin Simmons. This engaging quiz, featuring 20 medium-difficulty multiple-choice questions, is designed to challenge and enhance students' understanding of how mass is conserved during chemical reactions. Covering essential topics such as the definition of the law, balanced equations, and the difference between coefficients and subscripts, this quiz is a perfect tool for reinforcing key concepts. With time limits ranging from 30 seconds to 2 minutes per question, students will be tested on their ability to apply these principles in real-world scenarios, aligning with K–12 curriculum standards. Understanding the law of conservation of mass is crucial for budding chemists, as it lays the foundation for more advanced studies. This principle, which states that matter cannot be created or destroyed in chemical reactions, is a cornerstone of chemistry education. Students will explore the nuances of chemical formulas, learn to balance equations, and distinguish between chemical and physical changes. By calculating mass relationships between reactants and products, they will develop critical thinking and problem-solving skills. These concepts are not only vital for academic success but also for understanding the world around us, as they connect to everyday observations and applications. Get ready to transform your learning experience with Quizizz! Our interactive platform makes mastering the law of conservation of mass exciting and fun. With immediate feedback and a game-based learning approach, Quizizz boosts student motivation and retention. Teachers can effortlessly track progress and identify areas needing reinforcement, thanks to our customizable features that cater to diverse learning needs. Explore our vast library of K-12 science resources and watch your students thrive. Embrace the adventure of learning with Quizizz, where education meets excitement, and every quiz is a step towards academic empowerment.

20 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Matter can not be created nor destroyed: it can only be

Destroyed a little bit

Invisible

Transformed, changed

None of the above

Tags

NGSS.MS-PS1-5

2.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The number to the lower side of an element is a

Subscript

Superscript

Coefficient

Charge

Tags

NGSS.MS-PS1-1

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The number in front of a compound or element is a

Subscript

Coefficient

Superscript

Charge

4.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

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

5.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which of these is not a chemical reaction?

Burning of wood

Milk going bad

Mixing vinegar and baking soda

Melting of ice

Tags

NGSS.MS-PS1-2

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The coefficient in 3H₂O is

6

2

3

5

Tags

NGSS.MS-PS1-1

7.

MULTIPLE CHOICE QUESTION

45 sec • 12 pts

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

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Law of conservation of mass

20 questions

Matter can not be created nor destroyed: it can only be

The number to the lower side of an element is a

The number in front of a compound or element is a

A chemical reaction is balanced when

Which of these is not a chemical reaction?

The coefficient in 3H₂O is

If reaction starts with 20g of reactants it should produce

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

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

Measure of the amount of matter

Create a free account and access millions of resources

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Law of conservation of mass

20 questions

Matter can not be created nor destroyed: it can only be

The number to the lower side of an element is a

The number in front of a compound or element is a

A chemical reaction is balanced when

Which of these is not a chemical reaction?

The coefficient in 3H2O is

If reaction starts with 20g of reactants it should produce

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

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

Measure of the amount of matter

Create a free account and access millions of resources

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The coefficient in 3H₂O is