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.

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

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.

The gas that was produced was not able to be weighed since the container was open.

His chemical reaction defied the law of conservation of mass

The product destroyed mass during the reaction

The reactants created matter during the reaction

In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

You can't tell with the given information.

Mrs. Godfrey wants to prove to her students that when an object is burned, its total mass is the same before and after the reaction. What should Mrs. Godfrey do to make sure this is shown by the experiment?

burn the object in a closed container

burn the object outside on a nice day

add water to the object after it is burned

split the object into two equal pieces before burning

If a chemical reaction occurs in an open system (not contained), what might happen to the measurable mass of the products when compared to the reactants?

the measurable mass might decrease because any gas produced can escape (the actual mass would stay the same)

the mass would increase because mass was created

the measurable mass would stay the same because nothing would be able to leave the system.

it depends on the type of reaction

If a chemical reaction occurs in a closed system (no way for any part of the reaction to escape), how does the product mass compare to the reactant mass?

it depends on the type of reaction

Law of Conservation of Mass

Authored by Charles Martinez

Science

7th - 9th Grade

NGSS covered

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20 questions

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MULTIPLE CHOICE QUESTION

5 mins • 12 pts

Is this equation balanced or unbalanced?
H₂ + O₂ --> H₂O

balanced

unbalanced

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Is this equation balanced or unbalanced?
CH₄ + 2O₂--> CO₂+ 2H₂O

balanced

unbalanced

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

5 mins • 12 pts

Is this equation balanced or unbalanced?
2Fe₂O₃ + 3C --> 4Fe + 3 CO₂

balanced

unbalanced

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 12 pts

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-PS1-5

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

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How many nitrogen atoms does NH₃ have?

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

How many oxygen atoms are in this chemical formula?

6 oxygen atoms

2 oxygen atoms

3 oxygen atoms

4 oxygen atoms

Tags

NGSS.MS-PS1-1

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Law of Conservation of Mass

Is this equation balanced or unbalanced?
H₂ + O₂ --> H₂O

Is this equation balanced or unbalanced?
CH₄ + 2O₂--> CO₂+ 2H₂O

Is this equation balanced or unbalanced?
2Fe₂O₃ + 3C --> 4Fe + 3 CO₂

What is the Law of Conservation of mass?

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

How many nitrogen atoms does NH₃ have?

How many oxygen atoms are in this chemical formula?

Which Chemical Equation is Balanced?

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?

What is the law of conservation of mass?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

Law of Conservation of Mass

Is this equation balanced or unbalanced? H2 + O2 --> H2O

Is this equation balanced or unbalanced?CH4 + 2O2--> CO2+ 2H2O

Is this equation balanced or unbalanced? 2Fe2O3 + 3C --> 4Fe + 3 CO2

What is the Law of Conservation of mass?

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

How many nitrogen atoms does NH3 have?

How many oxygen atoms are in this chemical formula?

Which Chemical Equation is Balanced?

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?

What is the law of conservation of mass?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

Is this equation balanced or unbalanced?
H₂ + O₂ --> H₂O

Is this equation balanced or unbalanced?
CH₄ + 2O₂--> CO₂+ 2H₂O

Is this equation balanced or unbalanced?
2Fe₂O₃ + 3C --> 4Fe + 3 CO₂

How many nitrogen atoms does NH₃ have?

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?