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D1 Chemical Reactions
Test Description: Counting Atoms
Instructions: Answer all questions to get your test result.
1) How many atoms of Hydrogen are present in 5H20?
A
7
B
5
C
10
D
2
2) How many atoms of Carbon are present in 3C2H12N6?
A
2
B
6
C
3
D
12
3) How many elements are in water (H2O)?
A
4
B
1
C
3
D
2
4) What is the conservation of matter?
A
matter can be created but not destroyed
B
matter is neither created or destroyed
C
matter can be destroyed but not created
D
matter can be created and destroyed
5) According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
A
the masses are always equal
B
the mass of products is sometimes greater
C
the mass of reactants is greater
D
there is no relationship
6) Determine the number of Oxygen (O) atoms are in the following chemical formula: Pb(NO3)2
A
12
B
6
C
3
D
2
7) The Law of Conservation of Mass helps us understand that if 12 g Hydrogen and 18 grams Oxygen react then the product will have a mass of
A
18g
B
30g
C
42g
D
12g
8) The substances that chemically combine to form a new substance. They are found before the yeild sign.
A
chemical equation
B
law of conservation of mass
C
products
D
reactants
9) The substances that are formed as a result of a chemical reaction.
A
law of conservation of mass
B
products
C
reactants
D
chemical equation
10) According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
A
the mass of products is sometimes greater
B
there is no relationship
C
the mass of reactants is greater
D
the masses are always equal
11) How many molecules are in 20NaCl?
A
1
B
21
C
2
D
20
12) The subscript in a chemical formula indicates the
A
number of atoms
B
reactivity index
C
number of molecules
D
number of elements
13) The coefficient indicates the number of
A
elements
B
reactivity index
C
atoms
D
molecules
14) Matter can undergo physical and chemical changes. A physical change is a change of matter from one form to another without a change in the identify of the substance. Which process is an example of a physical change?
A
milk souring
B
wood burning
C
ice melting
D
metal rusting
15) A color change happens during an experiment mixing two liquids. Is this a physical change or chemical change?
A
A color change always indicates a chemical change.
B
A color change can be from a physical change or a chemical change.
C
A color change does not mean either a physical change or a chemical change.
D
Color is a physical property, so it is only a physical change.
16) There are several differences between chemical and purely physical changes. Which process is an example of a chemical change?
A
steam rising from a boiling pot of soup
B
a metal railing rusting in damp weather
C
alcohol evaporating from a cotton swab
D
a piece of wood shrinking as it dries out
17) Matter can undergo both chemical and physical changes. What indicates that the change was definitely chemical?
A
A gas formed
B
A precipitate formed
C
The temperature changed
D
The color changed
18) A chemical change is different than a physical change because in a chemical change __________.
A
The change can be seen but in a physical change it cannot.
B
Molecules do not physically touch.
C
A new substance is formed and in a physical change no new substance is formed.
D
Chemicals are used.
19) Which shows one example of a physical change and one example of a chemical change?
A
dissolving powder and shredding paper
B
boiling water and melting wax
C
rusting iron and baking a cake
D
freezing water and burning coal
20) Which of the following causes a chemical change in matter rather than a physical change.
A
boiling
B
melting
C
freezing
D
burning
*select an answer for all questions
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