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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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characteristics of chemical reactions unit review
Flashcards
23 cards
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Questions
23
Answers
1
How many hydrogen atoms will be present in the product?
1
3
2
4
2
Hydrogen and oxygen form water. Atomically, how do you know there was a chemical reaction?
For every oxygen atom, two hydrogen atoms are needed.
Oxygen atoms are much larger that hydrogen atoms.
Hydrogen molecules are negative, and oxygen positive.
The hydrogen and oxygen atoms regroup into a new molecule.
3
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 temp.
A new substance with different properties is formed.
The substance seems to disappear after dissolving in water.
The reaction can be reversed.
4
How many molecules of H2O will be present in the product?
4
1
2
3
5
a molecule is
The simplest unit of a chemical compound that can exist
the smallest particle of an element
6
Natural resources that undergo a chemical process become a
reactant
compound
property
synthetic material
7
Physical and chemical characteristics of matter used to describe or identify a substance
compound
product
properties
reactant
8
a precipitate is
a substance that reacts during a chemical reaction
a solid that is deposited from a solution
9
A new substance with unique chemical and physical properties
atom
reactant
molecule
compound
10
Why does fruit change color and rot?
the fruit is ripe
no chemical reaction has occurred.
A chemical reaction has occurred in the fruit
the fruit is filled with bacteria
11
How many carbon atoms will be present in the product?
1
4
2
3
12
How many molecules of CO2 will be present in the product?
4
2
3
1
13
Rust forming on a piece of iron is an example of which of the following?
a physical change
a chemical change
a violation of the laws of physics
the natural process of decay
14
T or F: Chemical reactions produce new substances
True
False
15
Using the photo above the items on the right of the arrow are called
reactants
carbon
chemicals
products
16
Using the photo above the items on the left of the arrow are called
carbon
products
chemicals
reactants
17
A substance produced during a chemical reaction
product
precipitate
atom
molecule
18
The smallest particle of an element: made of electrons, protons, and neutrons.
atom
particle
molecule
cell
19
How many oxygen atoms will be present in the product?
2
1
4
3
20
a reactant is
natural resources that undergo a chemical reaction
a new substance with unique chemical and physical properties
a substance that doesn't changed at all during a reaction
a substance that undergoes change during a reaction
21
The process by which one or more substances change to produce one or more different substances
reactant
chemical reaction
chemical process
Chemical change
22
method or means of changing one or more chemicals or chemical compounds
water
chemical change
chemical reaction
chemical process
23
T or F: not all chemical reactions will produce one of the five signs
False
True
