Characteristics of Chemical Reactions
Authored by Jessalynn Sturza
Science
6th - 8th Grade
NGSS covered
Used 208+ times
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25 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Hydrogen and oxygen react to form water. At an atomic level, how do we know that a chemical reaction has occurred?
Hydrogen molecules are negative, and oxygen positive
For every oxygen atom, two hydrogen atoms are needed
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
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 of the lack of a temperature change
We know combining Substances A and B resulted in a chemical reaction because of the lack of a temperature change
We know combining Substances A and B resulted in a chemical reaction because of the lack of a temperature 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
The natural process of decay as metallic ions age
A violation of the laws of physics because new mass has been created
Tags
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
Melting ice 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
Tags
NGSS.MS-PS1-2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Hint: gas bubbles are being produced. Chemical reaction or not?
yes
no
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Chemical reaction or not?
yes
no
Tags
NGSS.MS-PS1-2
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