Answer:
a). ice melting : physical change
b). paper burning : chemical change
c). metal rusting : chemical change
d). gas pressure increasing : physical change
e). liquid evaporating : physical change
f). food digesting : chemical change
what is chemical and physical changes
Explanation:
physical change
Physical modifications are those that affect a chemical substance's form but not its chemical content. Physical changes may normally be used to separate compounds into chemical elements or simpler compounds, but they cannot be used to separate mixtures into their component compounds. When something changes physically but not chemically, it is said to have undergone a physical change. This contrasts with the idea of a chemical change, where a substance's composition changes or a substance or substances combine or separate to generate new compounds. A physical change can typically be reversed through physical means. For instance, allowing water to evaporate can be used to recover salt that has been dissolved in it.
Texture, shape, temperature, and a change in the state of matter are examples of various physical changes. A substance's texture changes how it feels, and vice versa. For instance, a block of wood may seem rough to the touch, but smoothing the surface with sandpaper makes the wood feel smooth to the touch. Sanding just altered the surface's texture; the wood itself did not convert into a new material. Even though a piece of metal may glow after being burnt in a fire, the metal is the same substance both during and after cooling. Similar to this, a material changing phases simply undergoes a physical change; the material itself remains unaltered.
chemical change
Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions. Exothermic processes are those that generate heat; endothermic reactions, on the other hand, are those that may need heat in order to proceed. The science of chemistry places a lot of emphasis on comprehending chemical changes. Atoms are rearrange during chemical reactions, and as new products are produced, the reaction is accompanied by an energy change. The reaction of sodium and water to produce sodium hydroxide and hydrogen is an illustration of a chemical transition. When iron combines with oxygen to form iron oxide, as happens when an iron nail is left outside and develops a reddish-brown rust, this is an example of a color change signaling a chemical reaction. An example of an odor that develops as a result of a chemical shift is rotting food. Food gradually spoils when left out too long or after it has passed its expiration date, and when it is in this rotten state it frequently has an unpleasant stench. This is due to the chemical processes that occur as food starts to degrade and spoil, which result in the production of new chemicals with distinctive odors.
When iron combines with oxygen to form iron oxide, as happens when an iron nail is left outside and develops a reddish-brown rust, this is an example of a color change signaling a chemical reaction.
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