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Worksheets3.2 Changes in Matter
Total questions: 10
Worksheet time: 5mins
How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?
The ash has the same mass as the log, although a large percentage of it blows away.
The law of conservation of mass applies to changes of state but not to chemical reactions.
The law of conservation of mass applies to substitution and displacement reactions, but not to combustion reactions.
The masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning.
In the chemical reaction shown below, how do you classify hydrogen and oxygen?
2H2 + O2 → 2H2O
products
reactants
physical changes
chemical properties
A(n) ____________ is a transition from one state of matter to another.
chemical change
phase change
extensive property
intensive property
Which of the following is not evidence of a chemical reaction?
spoiled food
rust
melting
color change
In the chemical reaction shown below, what is the beginning mass of the reactant: mercuric oxide (mercury (II) oxide)?
2HgO (? Grams) → 2Hg (200. grams) + O2 (16 grams)
184 grams
200 grams
16 grams
216 grams
A ___________ change alters the form or appearance of matter but does not change the substance's identity (composition).
physical
chemical
substantial
climate
The fact that matter is not created or destroyed in any chemical or physical change is called the law of ___________________.
conversation of manatees
conservation of man
conservation of mass
conservation of trees
Interpret: The following is best described as a:
Compound
Element
Mixture of elements
type of atom
Interpret: This picture best represents which of the following?
mixture of compounds
a compound
a mixture of atoms
a type of atom
