8.5E Evidence of a chemical reaction and law of conservation of mass

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

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

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

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

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

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

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

Front

What evidence of chemical reaction will be observed based on this chemical reaction?

Back

Formation of precipitate

Tags

NGSS.MS-PS1-2

Front

Which description provides evidence that chemical reactions form new substances with different chemical properties? Options: Bubbles formed in a bathtub, Food coloring added to water, Butter melted in a pan, Eggs fried in a skillet

Back

Eggs fried in a skillet

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Which investigation results do NOT represent evidence of a chemical reaction?

Back

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5