Changes in matter may be classified as either physical change. When there are no changes in the chemical composition that occur the change is considered a physical change. When there is an accompanying change in composition, the change is...
Describe the differences between physical change and chemical change in a material. Use examples related to the fire service to illustrate physical change and chemical change. Decide whether a physical or a chemical change is involved. Evaporation of alcohol Choose a chemical substance, ...
Figure 01: Sublimation of Dry Ice We can observe this process only under special situations in special materials. Pure naphthalene is such a subliming material. Another substance that sublimes is solid carbon dioxide, which is also known as dry ice. Iodine crystals, ice, and snow behave as su...
Answer and Explanation:1 The answer is D) Burning Coal. Burning coal involves a chemical change since the chemical composition of the substance changes. When coal is...
A) physical reaction B) change in phase C) rise in temperature D) chemical change Chemical Reaction: The chemical reaction can be considered as the change occurs in the molecule and compound at its molecular level, which can involve the form...
Which of the following is/are examples of a chemical change? a. Carving wood. b. Snow melting. c. Dry ice subliming (solid CO_2 vaporizing into a gas, passing the liquid state). d. Burning cookies in the oven...
Which one of the following is not a physical process? A. Dry ice subliming B. Steam condensing C. Alcohol evaporating When water freezes and becomes solid ice, the hydrogen bonds create a crystal structure and there is fixed space between each water molecule. This ca...
What is the name of the process in which a solid phase transitions directly to a gas? (a) freezing. (b) melting. (c) boiling. (d) condensation. (d) sublimation. Which one of the following is not a physical process? A. Dry ice subliming B. Steam ...
a) Cooking b) Burning c) Rusting d) Crushing e) Igniting Physical Change: A physical change is the one in which there is a change in all the different types of physical properties of a compound. These changes are found to be reversible. Answer and ...
b) A very hard, blackish solid subliming at 2 A particular pure substance melts at 43 degrees Celsius and does not conduct electricity in either the solid or liquid state. This substance is most likely: a. ionic b. molecular c. covalent d. metallic What is ...