Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.
Emphasis is on the law of conservation of matter and on physical models or drawings, including digital forms, that represent atoms. The use of atomic masses, balancing symbolic equations, or intermolecular forces is not the focus of this performance expectation.
Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
Examples of reactions could include burning sugar or steel wool, fat reacting with sodium hydroxide, or mixing zinc with hydrogen chloride. Examples of chemical and physical properties to analyze include density, melting point, boiling point, solubility, flammability, or odor.
Track each student's skills and progress in your Mastery dashboards
Give this quiz to my class
Q 1/18
Score 0
In a chemical reaction, how does the law of conservation of matter apply to the number of atoms involved?
30
The total number of atoms remains the same before and after the reaction.
The number of atoms can change, but mass is constant.
Atoms are created during the reaction.
Atoms can disappear during the reaction.
Q 2/18
Score 0
Why is it important to use models to represent atoms in chemical reactions?
30
Models prevent the law of conservation of matter.
Models allow atoms to be created or destroyed.
Models help visualize how atoms rearrange during reactions while conserving the total number of atoms.
Models increase the number of atoms during reactions.
18 questions
Q.
In a chemical reaction, how does the law of conservation of matter apply to the number of atoms involved?
1
30 sec
7-MS-PS1-5
Q.
Why is it important to use models to represent atoms in chemical reactions?
2
30 sec
7-MS-PS1-5
Q.
3
30 sec
7-MS-PS1-5
Q.
What happens to the mass of the reactants and products in a closed system during a chemical reaction?
4
30 sec
7-MS-PS1-5
Q.
Which statement best describes the rearrangement of atoms during a chemical reaction?
5
30 sec
7-MS-PS1-5
Q.
6
30 sec
7-MS-PS1-5
Q.
How does a physical model help in understanding chemical reactions with respect to atom conservation?
7
30 sec
7-MS-PS1-5
Q.
8
30 sec
7-MS-PS1-5
Q.
When iron rusts by reacting with oxygen to form iron oxide, how does the law of conservation of matter apply?
9
30 sec
7-MS-PS1-5
Q.
In a closed container, 2 hydrogen atoms react with 1 oxygen atom to form water. What happens to the total number of atoms during this chemical reaction?
10
30 sec
7-MS-PS1-5
Q.
When baking soda reacts with vinegar in a sealed container, what happens to the overall mass of the container and its contents?
11
30 sec
7-MS-PS1-5
Q.
Imagine you have a model representing a chemical reaction where carbon and oxygen form carbon dioxide. How does this illustrate the law of conservation of matter?
12
30 sec
7-MS-PS1-5
Q.
What does a model of a chemical reaction where nitrogen gas reacts with hydrogen gas to form ammonia illustrate about the conservation of matter?
13
30 sec
7-MS-PS1-5
Q.
When sodium hydroxide reacts with fat, what type of reaction occurs when a new substance is formed?
14
30 sec
7-MS-PS1-2
Q.
Which property would you analyze to determine if burning of steel wool resulted in a chemical reaction?
15
30 sec
7-MS-PS1-2
Q.
After zinc is mixed with hydrogen chloride, which observation indicates that a chemical reaction has taken place?
16
30 sec
7-MS-PS1-2
Q.
Which property change would best indicate a chemical reaction when sugar is burned?
17
30 sec
7-MS-PS1-2
Q.
When observing the reaction between zinc and hydrogen chloride, which property was most likely changed, indicating a chemical reaction?
