Unit 2 Chemical Reaction Post Test
9 Questions
| Total Attempts: 92
In chemistry, a reaction is a process that involves the rearranging of the molecular or ionic structures of a substance, as distinct from a change in physical form or a nuclear reaction. What do you know about them?
Questions and Answers
- 1.Atom comes from the Greek word, atomos. What does it mean?
- A.
Really small
- B.
Unable to be cut
- C.
Matter
- 2.What are the three subatomic particles that make up atoms?
- A.
Protons
- B.
Hydrogen
- C.
Electrons
- D.
Neutrons
- E.
Carbon
- 3.What charge do protons have?
- A.
Positive
- B.
Neutral / No charge
- C.
Negative
- 4.What charge do neutrons have?
- A.
Positive
- B.
Neutral / No charge
- C.
Negative
- 5.What charge do electrons have?
- A.
Positive
- B.
Neutral / No charge
- C.
Negative
- 6.Which two make up the nucleus in an atom?
- A.
Protons
- B.
Neutrons
- C.
Electrons
- 7.Which two have the same mass?
- A.
Protons
- B.
Neutrons
- C.
Electrons
- 8.Electrons are...
- A.
Are in constant motion in the space surrounding the nucleus.
- B.
Are in constant motion inside the nucleas.
- 9.Atoms have an equal number of _______ and _________.
- A.
Neutrons
- B.
Electrons
- C.
Ions
- D.
Hydrogen
- E.
Protons
What do you know about chemical reactions? A chemical reaction is a route that leads to the transformation of one group of chemical substances to another. Chemical reactions exemplify changes that only involve electrons'...
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Sample QuestionWhich one of the following represents a physical change?
An extensive property is a property that depends on the amount of matter in a sample whereas intrusive properties are mostly determined by the physical property of a system. Test how well you understand the difference and...
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Sample QuestionProperties that do depend on the amount of matter present.
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Questions: 17 | Attempts: 5628 | Last updated: Sep 11, 2020
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Sample QuestionPb(NO3)2+ 2 KI ---> PbI2+ 2 KNO3 What constitutes this reaction?
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