Matter
Everything that you can touch, seem feel or smell. It is also made out of molecules
What is Matter
what is the definition of a mixture and what is the definition of a pure substance?
mixture: a combination of 2 or more sdifferent substances that are mixed together
pure substance: anything that is made out of only one substance
Name one way you can decrease the rate of dissolving
decrease the temperature
do not stir
what does it mean to be observant? why do detectives have to be observant?
it does not mean only remembering what you see it also means using your senses to gather information. Detectives have to be observant to make sure that they dont miss any information,clues or evidence that might help them solve the crime
What are some things that investigators are looking for when they see shoe or foot prints? (name 4 and explain)
size = how tall
depth= how heavy
length = long or short strides
direction = where they were going
pattern= walking, running, limping
manufacturing = type of shoe based on the style
In this state, molecules have a high level of attraction and also have a strong bond. What state is constantly only vibrating?
What is a Solid
what is the name of a mixture where you can still see what substances have been mixed together?
heterogeneous
explain using the particles what happens during dissovling
the particles are colliding (hitting) each other which causes them to break into smaller pieces and so they mix faster
what is an eyewitness and why are they not 100% reliable?
a person who was at the crime seen and saw what happened. police cab question them to get a better understand about what happened but the police have to be careful because they are not 200% reliable because people can remember things wrong and are not very observant
what is a pronate shoe print?
a person who puts more pressure on the inside of their foot
Give 3 characteristics of a gas
1.) does not have a definite shape
2.) does not have a definite volume
3.) molecules are not attracted to each other / weak bond
Name the 3 types of solid+liquid mixtures
suspensions
colloids
solutions
tell us one of your biggest deepest, darkest secrets!
;)
"where were you exactly when you say you were home?" is an example of what type of question? and why?
Probing question because it is trying to find out more specific details.
how can detectives tell if a person was running or walking based off of their footprint?
they look at the distance between each step (stride length) the futher apart the footprints the more likely they were running
What does sublimation mean? and how does it happen?
when matter changes from a solid to a gas because of a change in temperature, specifically increasing the temperature
another name for a homogeneous mixture is _______________.
there are 2 main parts to this mixture the ____________ and the ______________.
explain which one is which
another name for a homogeneous substance is a solution
the parts are the solute (the one being dissolved) and the solvent (the one doing the dissolving)
From beginning to end, what are the steps that investigators go through when solving a crime?
1.) gather evidence by using observation, questioning and looking for evidence
2.) analyzing the clues and evidence
3.) making a prediction about what will happen next
4.) come up with an hypothesis about what happened at the crime scene
What is the definition of predicting and hypothesizing?
prediction: an educated guess of what will happen in the future based off of past information
hypothesis: an educated guess based off of evidence of what happened at the crime scene
What are the 3 types of animal tracks?
walkers, hoppers and trotters
Name all 6 processes that occurs when matter changes from one state to another.
1.) fusion
2.) sublimation
3.) solidification
4.) evaporation
5.) condensation
6.) deposition
what is the definition of dissolving?
what does soluble mean?
What does insoluble mean?
dissolving: when the added substance is evenly distributed and cannot be seen in the solution anymore
soluble: substances that are able to dissolve in the liquid
Insoluble: substances that are not able to dissolve in the liquid
a random guy, accidentally walks into a crime scene without knowing and starts touching random things in the room that catches his attention. One of the things he thinks was cool was a Japanese sword so he picks it up and starts playing with it. While he was playing with it he noticed that there was red stuff on the blade and a person sleeping on the floor.....uhhhh ohhhh. This situation is an example of __________________
contamination
Not based off of direct observation, reaching a conclusion based off of evidence and reasoning, is the definition of _________________. give an example
definition of inferences
if an animal track has claws and pads what does it indicate?
that the animal with these tracks catches and eats other animals