Multiple Choice Chem Test 2
What are some physical properties of a substance?
-color and odor -melting and boiling points -malleability and hardness
What indicates that a chemical change may have taken place?
-gas production -energy transfer -precipitate formation
The chemical symbol for iron is
Fe
Which of the following represents a compound?
H2O
When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
a chemical change
Which of the following CANNOT be considered a single phase: a pure solid, a pure liquid, a homogenous mixture, a heterogenous mixture?
a hetergenous mixture
Which of the following is a chemical property: color, hardness, freezing point, ability to react with oxygen
ability to react with oxygen
All of the following are physical properties of matter except: melting point, color, mass, ability to rust
ability to rust
Which of the following CANNOT be classified as a substance: table salt, air, nitrogen, gold?
air
Which of the following processes does NOT involve a change in chemical properties: rusting, fermenting, boiling, burning?
boiling
Which field of science studies the composition and structure of matter?
chemistry
A substance that can be separated into 2 or more substances only by a chemical change is a
compound
Which action changes the identity of the substance referenced?
corroding iron
A chemical change occurs when a piece of wood..
decays
Which of the following does NOT involve a physical change: mixing, melting, grinding, decomposing?
decomposing
Separating a solid from a liquid by evaporating the liquid is called
distillation
Which of the following is a physical change: corrosion, explosion, evaporation, rotting of food?
evaporation
Which of the following is NOT a physical change: grating cheese, melting cheese, fermenting of cheese, mixing 2 cheeses in a bowl?
fermenting of cheese
Which state of matter expands when heated and is easy to compress?
gas
Which state of matter takes both the shape and volume of its container?
gas
Which of the following is NOT an example of matter: air, heat, smoke, water vapor?
heat
The study of chemicals that, in general, do not contain carbon is traditionally called what type of chemistry?
inorganic
What is a chemical property of water at 4 degrees Celcius?
its ability to decompose into hydrogen and oxygen
Which state of matter has a definite volume and takes the shape of its container?
liquid
Which state of matter is characterized by having an indefinite shape, but a definite volume?
liquid
A substance that forms a vapor is generally in what physical state at room temperature?
liquid or solid
Which step in the scientific method requires you to use your senses to obtain information?
making an observation
An example of an extensive property of matter is
mass
What happens to matter during a chemical reaction?
matter is neither destroyed or created
What distinguishes a substance from a mixture?
mixtures can be separated physically, while compounds cannot
Which of the following is a heterogenous mixture: vinegar in milk, milk, air, oil and vinegar?
oil and vinegar
The variable that is observed during an experient is called what type of variable?
responding
All of the following changes to a metal are physical changes except: bending, melting, rusting, polishing?
rusting
Which of the following items is NOT a compound: baking soda, sucrose, table salt, salad dressing?
salad dressing
Which of the following materials is a substanace?
silver
Which of the following is a heterogenous mixture: air, salt water, steel, soil?
soil
Which state of matter is characterized by having a definite shape and a definite volume?
solid
What are homogenous mixtures also known as?
solutions
When an iron nail is ground into powder, its mass
stays the same
In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?
sucrose
A theory is a...
well-tested explanation for a broad set of observations
Which of the following indicates that a chemical change has happened during cooking?
The food darkens
What is true for all chemical reactions?
The total mass of the reactants equals the total mass of the products.
What must occur for a change to be a chemical reaction?
There must be a change in chemical properties.
T or F: Compounds are substances.
True