Vocab
Tiny pieces of matter that are too small to see
atoms
________ help scientists answer a question about something that is hard to observe.
models
How do you get 2 liquids that usually separate to stay mixed?
add an emulsifier
What happens when you mix a solid into a liquid?
a. sometimes the solid dissolves
b. sometimes the solid leaves sediment
c. both A and B
c. Both A and B
Which property is very important when creating a model with lecithin to show it attracting two liquids, like oil and vinegar?
a. size b. texture
c. smell d. shape
A _______________ is one kind of atom or molecule.
substance = same
Using your 5 senses to learn about something:
a. reading b. counting
c. observing d. eating
c. observing
if molecules are attracted to each other, they_______:
a. separate b. properties
c. attach d. repel
attach
When we say something is soluble, that means it...
a. dissolves
b. turns into air
c. gets bigger
d. does not mix with water
a. dissolves
What happens when you mix a liquid into another liquid?
a. you create a potion
b sometimes the two liquids separate into layers
c. sometimes the liquids stay mixed
d. Both B and C
d. Both B and C
to pull on an object, even without touching it
attract
Which word best describes this picture?
(Mrs. P will show picture)
D. Mixture
What process occurs when two substances completely mix together?
dissolving
When a molecule can dissolve in a liquid, it is _____.
a. substance b. soluble
c. chromatography d. sediment
If two liquids stay mixed together, the mixture is...
a. stable
b. unstable
c. sour
d. molecule
a. stable
A group of atoms joined together in a particular way
molecule
All substances have the same properties:
TRUE or FALSE
False
What does an emulsifier do? (2 answers)
a. it keeps mixtures mixed when they usually separate
b. it makes two substances separate and not mix
c. it makes an unstable mixture stable
d. it changes the molecules into one kind of molecule
A and C
In order for a solid to dissolve into a liquid, what must be true?
a. solid needs to be hot
b. the solid needs to separate from the liquid
c. solid should be highly attracted to the liquid molecules
C. the solid should be highly attracted to the liquid molecules.
Oil and vinegar separate into layers because....
a. oil molecules have a low attraction to vinegar mol.
b. oil molecules are solid and vinegar mol. are liquid
c. oil molecules have a high attraction to vinegar mol
d. oil molecules are larger than vinegar molecules
A. Oil molecules have a low attraction to vinegar
Sugar molecules are _______________ because they fully dissolve in water.
soluble
Some examples of properties of substances are:
a. size b. smell
c. shape d. all of the above
D.
Which molecule shows the emulsifier?
(Mrs. P will hold up picture)
b. The gray molecule in the middle
What property allows sugar to dissolve completely in liquids, like water?
a. color b. attraction
c. texture d. smell
b. attraction
If substances have low attraction to one another, how would a model of them look?
(Mrs. P. will show picture)
B