1. Intro to General Chemistry

Which of the following is a physical change?

Which of the following represents a reversible change?

In physical changes, substances might change in ________ but not in ________.

Which best explains why making a pancake from batter is an example of a chemical change?

Where are chlorofluorocarbons found? 

 A. Coolants 

 B. The atmosphere 

 C. Solvents 

 D. All of the above

When substances go through chemical changes, which of the following will always happen?

Which process is a chemical change? Is it burning a match, boiling water, melting ice, or breaking glass?

When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?

Which property of physical changes explains why matter is conserved in a physical change?

If there are 8 g of a substance before a physical change, how much will there be afterwards?

What must be done to be certain that a chemical change has taken place?

When a substance changes states (melts, evaporates, etc.) it is often what type of change?

Which actions are evidence that a chemical reaction has occurred? Check all that apply.

Which of the following is a clue that a chemical change has taken place?

The oxidation of haircolor is an example of a _____.

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

Which of the following is an example that includes evidence of a chemical change?

A piece of limestone erodes due to acid rain. this process can be best described as a

Acid rain hits a statue. Over time holes are formed in the statue. This is an example of

If two substances are mixed and a new substance is formed, what type of change is it?

Which of the following is an indication that a substance has undergone a chemical change?

What type of change occurs when water changes from a solid to a liquid?

A specific type of physical change is a _________ change.

Which of the following is an indication that a substance has undergone a chemical change?

What type of change occurs when water changes from a solid to a liquid?

Which of the following is a common sign that a chemical change has occurred?

A specific type of physical change is a _________ change.

If two substances are mixed and a new substance is formed, what type of change is it?

Which of the following summarizes a change that takes place as a solid turns to a liquid?

How do chemical weathering and deposition contribute to the formation of the features shown here?

How can you tell whether a change in matter is caused by a chemical reaction?

When the color, smell, and taste of the mixture changed, I knew a chemical ___ had taken place.

Ciara's bike has rusted, which means that the iron in the metal changed to rust. What has occurred?

What is the process that changes one set of chemicals into another set of chemicals?

Which of the following physical changes shows a change in a substance's state of matter?

A change to the physical properties of a substance, like a change in size.

A physical change _____ change the composition or identity of the substance.

Which of the following is the best description for the formation of frost on windows in the winter:

i. a solid is turning into a gas,

ii. a liquid is turning into a solid,

iii. a gas is turning into a liquid,

iv. a gas is turning into a solid, or

v. a solid is turning into a liquid?

Ethyl chloride is sold as a liquid (see photo) under pressure for use as a local skin anesthetic. Ethyl chloride boils at 12 °C at atmospheric pressure. When the liquid is sprayed onto the skin, it boils off, cooling and numbing the skin as it vaporizes.

a. What changes of state are involved in this use of ethyl chloride?

b. What is the boiling point of ethyl chloride in degrees Fahrenheit?

c. The bottle shown contains 103.5 mL of ethyl chloride. The density of ethyl chloride at 25 °C is 0.765 g/cm3. What is the mass of ethyl chloride in the bottle?