8.5E Evidence of a chemical reaction and law of conservation of mass
Flashcard
•
Science
•
6th - 8th Grade
•
Practice Problem
•
Hard
Standards-aligned
Wayground Content
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12 questions
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1.
FLASHCARD QUESTION
Front
Back
The student can use the different colored dots to show a new substance was created from the original molecules.
Tags
NGSS.MS-PS1-2
2.
FLASHCARD QUESTION
Front
A student mixes two liquids together and notices that a white solid has formed at the bottom of the container. What can the student conclude?
Back
1, 3, and 4 only
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
3.
FLASHCARD QUESTION
Front
Two chemicals are mixed and sealed in a plastic bag. The bag begins to inflate and becomes hot to the touch. What evidence can the student cite to show a chemical reaction occurred?
Back
Formation of a gas and increase in temperature
Tags
NGSS.MS-PS1-2
4.
FLASHCARD QUESTION
Front
Which hypothesis supports the law of conservation of mass in chemical reactions?
Back
If the reaction obeys the law of conservation of mass, then mass will be the same before and after the reaction
Tags
NGSS.MS-PS1-5
5.
FLASHCARD QUESTION
Front
Students X and Y mix two clear liquids together during a laboratory investigation. They notice the color of the new solution is red. Student X concludes there has been a chemical reaction. Student Y concludes there has not been a chemical reaction. Which student drew a valid conclusion based on the information provided?
Back
Student X is correct because a change in color is evidence of a chemical reaction
Tags
NGSS.MS-PS1-2
6.
FLASHCARD QUESTION
Front
Which statement is NOT evidence that a new substance has formed during a chemical reaction?
- Gas is produced
- Temperature changes
- Precipitate forms
- Substance melts
Back
Substance melts
Tags
NGSS.MS-PS1-2
7.
FLASHCARD QUESTION
Front
During an investigation, students mix an unknown powder and unknown liquid. When the students pour the liquid into the powder, bubbles are produced. Which statement correctly identifies the type of investigation?
Back
The powder and liquid produce bubbles because a chemical reaction occurs
Tags
NGSS.MS-PS1-2
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