Identifying physical and chemical changes. matter has both physical and chemical properties and can undergo physical or chemical changes. physical properties are those that a substance displays without changing its composition, whereas chemical properties are evident only during a chemical change (also called a chemical reaction). in contrast, when a substance undergoes a physical change, it may change appearance, but not its composition. part a: classify each of the changes as a physical change or a chemical change. part b: classify each of the properties as a physical property or a chemical property.

Part A:  Physical change: Status changes of matter

chemical change: Any Chemical reaction

Part B: Physical property: Color, odor, etc

Chemical property: Flammability

Explanation:

Part A:  A physical change: It´s change of form but not chemical composition.

Examples of Physical change are the Status changes of matter like boiling, melting, chooping wood, breaking a bottle  and shredding paper.

A chemical change:  It´s a change in the chemical composition of the compounds and generate new ones. That is called "chemical reaction" and it implies a rearrange of atoms generating new compounds.

Examples of chemical change are oxidation of Iron, burning, cooking, digesting food, rusting of iron.

Part B: Physical property: Are properties that can be measured or observed directly with our senses

Examples of physical Property:  density,, appearance, texture, polarity, color, odor, melting point, solubility.

Chemical property:  Are properties that can be observed when tey participate in a chemical reaction.

Examples of chemical Property: Reactivity , Radioactivity, Flammability , Acidity or basicity

i believe the answer is true.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.