D1 Chemical Reactions Question Preview (ID: 61490)
Counting Atoms.
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How many atoms of Hydrogen are present in 5H20?
a) 5
b) 2
c) 10
d) 7
How many atoms of Carbon are present in 3C2H12N6?
a) 3
b) 6
c) 2
d) 12
How many elements are in water (H2O)?
a) 1
b) 2
c) 3
d) 4
What is the conservation of matter?
a) matter is neither created or destroyed
b) matter can be destroyed but not created
c) matter can be created and destroyed
d) matter can be created but not destroyed
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) there is no relationship
b) the mass of products is sometimes greater
c) the mass of reactants is greater
d) the masses are always equal
Determine the number of Oxygen (O) atoms are in the following chemical formula: Pb(NO3)2
a) 2
b) 3
c) 6
d) 12
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) 12g
b) 18g
c) 30g
d) 42g
The substances that chemically combine to form a new substance. They are found before the yeild sign.
a) reactants
b) products
c) law of conservation of mass
d) chemical equation
The substances that are formed as a result of a chemical reaction.
a) reactants
b) products
c) chemical equation
d) law of conservation of mass
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) there is no relationship
b) the mass of products is sometimes greater
c) the mass of reactants is greater
d) the masses are always equal
How many molecules are in 20NaCl?
a) 20
b) 1
c) 21
d) 2
The subscript in a chemical formula indicates the
a) number of atoms
b) number of molecules
c) number of elements
d) reactivity index
The coefficient indicates the number of
a) reactivity index
b) elements
c) atoms
d) molecules
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) ice melting
b) milk souring
c) metal rusting
d) wood burning
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) Color is a physical property, so it is only a physical change.
c) A color change can be from a physical change or a chemical change.
d) A color change does not mean either a physical change or a chemical change.
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
Matter can undergo both chemical and physical changes. What indicates that the change was definitely chemical?
a) The temperature changed
b) A precipitate formed
c) The color changed
d) A gas formed
A chemical change is different than a physical change because in a chemical change __________.
a) Chemicals are used.
b) Molecules do not physically touch.
c) A new substance is formed and in a physical change no new substance is formed.
d) The change can be seen but in a physical change it cannot.
Which shows one example of a physical change and one example of a chemical change?
a) boiling water and melting wax
b) rusting iron and baking a cake
c) dissolving powder and shredding paper
d) freezing water and burning coal
Which of the following causes a chemical change in matter rather than a physical change.
a) boiling
b) freezing
c) burning
d) melting
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