Characteristics of Chemical Reactions Assessment
Authored by Caroline G Scharenberg
Science
7th Grade
NGSS covered
Used 2+ times
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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Hydrogen and oxygen react to create water. At an atomic level, how do we know that a chemical reaction has occurred?
Hydrogen molecules are negative, and oxygen positive.
The hydrogen and oxygen atoms regroup into a new molecule.
Oxygen atoms are much larger than hydrogen atoms.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The chart below shows the results of combining various substances.
Which of the following statements is true?
We know combining Substances A and B resulted in a chemical reaction because a gas was formed.
We know combining Substances C and D resulted in a chemical reaction because there wasn't a temperature change.
We know combining Substances A and B resulted in a chemical reaction because there wasn't a temperature change.
None of the combinations resulted in a chemical reaction because neither one had a color change.
Tags
NGSS.MS-PS1-2
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is the best description of the results of a chemical reaction?
A new substance with different properties is formed.
The substance seems to disappear after dissolving in water.
The substance changes from liquid to solid at a low temperature.
The reaction can be reversed to get back the original substance.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Rust forming on a piece of iron is an example of which of the following:
A physical change because the process can be reversed
A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following statements is true?
Cutting paper is an example of a chemical reaction because a new substance is formed and the process cannot be undone.
Freezing water is an example of a chemical reaction because a new substance is formed and the process cannot be undone.
Burning paper is an example of a chemical reaction because a new substance is formed and the process cannot be undone.
Melting ice is an example of a chemical reaction because a new substance is formed and the process cannot be undone.
Tags
NGSS.MS-PS1-2
6.
OPEN ENDED QUESTION
3 mins • 1 pt
A student conducted an experiment where they mixed a solution of blue sodium bicarbonate and purple magnesium sulfate in a baggy. The following observations were noted:
1. Small hard particles could be felt in the bag.
2. The bag felt colder
3. The solution was blue
Explain which observations are evidence that a chemical reaction is taking place.
Evaluate responses using AI:
OFF
Tags
NGSS.MS-PS1-2
7.
OPEN ENDED QUESTION
3 mins • 1 pt
When vinegar and baking soda are combined, bubbles begin to form. Explain how the formation of bubbles is evidence of a chemical reaction.
Evaluate responses using AI:
OFF
Tags
NGSS.MS-PS1-2
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