Ascientist is performing an experiment on a powder. which of the following is a sign that a chemical change has definitely occurred during his experiment? the powder catches on fire.
the powder releases bubbles.
the powder heats up.
the powder breaks apart into smaller particles.

mass and volume are the answers you are looking for

the given statement is true.

sensory memory lasts for a fraction of seconds before the information is lost. it is the shortest -term memory and can be called as an element of memory. example: when we look at something and remember what it looks like, is just a second of observation. it degrades very quickly. it can also be considered as the process of perception rather than considering it as a memory.