QZ- Pre Lab (What is a Chemical Reaction)

What is a chemical change?

• A change in the composition and properties of a substance

• A change in the physical appearance of a substance

• A change in the state of matter of a substance

• A change in the temperature of a substance

Which of the following is a sign of chemical change?

• Formation of a solid precipitate upon mixing of two solutions

• Release of gas bubbles due to boiling

• Color change due to dilution

• Temperature change due to external heating

What does the law of conservation of mass state?

• Mass is created in a chemical reaction

• Mass is destroyed in a chemical reaction

• Mass is conserved in a chemical reaction

• Mass is converted into energy in a chemical reaction

Which of the following is an example of a chemical change?

• A nail rusting

• Ice melting

• Wood burning

• A banana ripening

What evidence do we have for chemical rearrangements at the atomic level?

• Observation of mass conservation

• Observation of color change

• Observation of temperature change

• Observation of gas bubbles

What is the purpose of this experiment?

• To examine the chemical properties of hydrochloric acid and copper chloride

• To determine the types of reactions that hydrochloric acid and copper chloride undergo

• To test the law of conservation of mass in a sample chemical reaction

• All of the above

What does the term corrosive mean in referring to the safety hazard of hydrochloric acid?

• Causing physical damage to materials

• Causing a burning sensation on the skin

• Causing a foul odor

• Causing a change in color

What signs of chemical change are observed when milk sours?

• Formation of a solid precipitate

• Release of gas bubbles

• Color change

• Temperature change

What safety equipment MUST be worn at all times in this lab?

• Fire Blanket

• Goggles

• Lab Coat

• Hair Tie

You do not need to wear goggles after you are done with the lab and you are cleaning up.

• True

• False