Ch 1 and 2 Chem 105

What is chemistry the study of?

• Energy

• Matter

• Light

• Sound

What should a scientist do if the results of an experiment prove a hypothesis wrong?

• Ignore the results

• Modify or discard the hypothesis

• Publish the hypothesis anyway

• Change the experiment to fit the hypothesis

Which of the following is NOT a liquid at room temperature?

• Water

• Ethanol

• Gasoline

• Ice

Which statement is true about compounds?

• They are composed of a single type of atom

• They cannot be broken down into simpler substances

• They are composed of two or more elements in fixed proportions

• They are mixtures of different substances

What is the molecular formula for methane?

• CH4

• CO2

• NH3

• H2O

Which compound is represented by the formula H2O?

• Methane

• Ammonia

• Water

• Carbon dioxide

What is a characteristic of homogeneous mixtures?

• Nonuniform composition

• Uniform composition

• Varied composition

• No composition

What is the classification of matter that consists of only one type of particle?

• Mixture

• Compound

• Pure Substance

• Heterogeneous

Which of the following is the formula for cyanide

• CA+

• CN+

• CN-

• CA-

What is the formula for Chlorate

• CH

• ClH2-

• ClO3-

• ClO-