DA 1 Review pt. 1

Which statement describes one of the main differences between a physical and a chemical change?

• A chemical change involves reactants and products, whereas a physical change involves only reactants.

• A physical change is a change of state, whereas in a chemical change the substance keeps the same form.

• A physical change brings about a different form of the same substance, whereas a chemical change forms a different substance.

• A chemical change caused by adding or removing heat energy can usually be reversed, whereas a physical change can generally not be reversed.

During recycling, ground glass is melted under light heat and poured into molds. Which type of change occurs as the glass melts?

• Change in state

• Change in mass

• Change in reactivity

• Change in composition

Which is one way a chemical property can be witnessed?

• heating a substance to its boiling point

• examining a substance under a microscope

• watching a substance change it's shape

• observing how one substance interacts with another

Which of the following properties of a substance could change during a physical change?

• a substance rusts

• reacting with acids

• a solid is liquified at cool temperatures

• substance burn in oxygen

A geologist was looking at a new mineral they found. The mineral sample was gray, non-metallic, had density of 3.8 g/mL, and a volume of 48.3 mL of the observed properties listed below, which is considered to be an extensive property?

• Gray

• Metallic

• Density

• Volume

Which of the following words will fill in the blank for the following analogy?Intensive Property : Density :: Extensive Property : ____________

• Mass

• Malleable

• Conductivity

• Odor

What is an intensive property?

• a property that depends on the amount of matter present

• a property that does not depend on the amount of matter present

• a property that can be observed or measured without changing the composition of matter, such as mass or volume

• a property that changes the composition of matter

10.0 grams of water in the form of a solid has a temperature of 0.0 °C. The cube of ice is placed in a room with a temperature of 25.0 °C. The ice starts melting to form a puddle of water.The initial 10.0 grams of water is what kind of property?

• Intensive

• Extensive

• Personal

• Chemical

Which of the following 3 are intensive properties?

1. boiling point, 2.melting point, 3.mass, 4.density

• 1,3,4

• 1,2,4

• 1,2,3

• 2,3,4

Which of the following is a chemical change of an unknown substance?

• Precipitate was formed

• silver-white color change

• turned soft at room temperature

• decreased in size