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Characteristics of Chemical Reactions Flashcards | StudBud
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Characteristics of Chemical Reactions
Characteristics of Chemical Reactions
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1
A __________ increase or decrease and the production of light are both signs that a chemical reaction may have occurred.
gas
odor
molecules
color
temperature
precipitate
2
Which of the following is the best description of the results of a chemical reaction?
The substance changes from liquid to solid at a low temperature.
A new substance with different properties is formed.
The reaction can be reversed to get back the original substance.
The substance seems to disappear after dissolving in water.
3
Which of the following statements is true?
Cutting paper, a new substance is formed and the process cannot be undone.
Burning paper, a new substance is formed and the process cannot be undone.
Melting ice, a new substance is formed and the process cannot be undone.
Freezing water, a new substance is formed and the process cannot be undone.
4
Smallest part of a substance
Atom
Molecule
Chemical reaction
Reactants
Product
5
atoms that make up a substance are regrouped into different _________ to form new substances with different properties.
odor
gas
molecules
color
temperature
precipitate
6
The chart below shows the results of combining various substances.
Which of the following statements is true?
Resulted in a chemical reaction because of the lack of a temperature change
Resulted in a chemical reaction because of the lack of a temperature change
Resulted in a chemical reaction because gas was formed
resulted in a chemical reaction because neither one had a color change
7
Hydrogen and oxygen react to form water. At an atomic level, how do we know that a chemical reaction has occurred?
Oxygen atoms are much larger than hydrogen atoms.
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.
8
An unexpected change in __________ is a sign that a chemical reaction may have occurred.
temperature
odor
color
molecules
precipitate
gas
9
Formed when two or more atoms chemically combine
Atom
Molecule
Product
Reactants
Chemical reaction
10
A process that leads to the transformation of one set of chemical substances to another
Reactants
Chemical reaction
Product
Molecule
Atom
11
The substances initially involved in a chemical reaction
Reactants
Product
Chemical reaction
Atom
Molecule
12
Rust forming on a piece of iron is an example of which of the following:
A violation of the laws of physics because new mass has been created
A physical change because the process can be reversed
Chemical change, oxygen atoms in the atmosphere bonded with the iron atoms
The natural process of decay as metallic ions age
13
A ______ is a solid substance that forms and separates from a solution and may indicate a chemical reaction occurred.
color
temperature
odor
precipitate
gas
molecules
14
The substance that is produced from a chemical reaction
Product
Molecule
Reactants
Chemical reaction
Atom
15
Substances giving off a smell, or __________ , while being combined is also an indicator of a chemical reaction.
gas
odor
molecules
temperature
color
precipitate
