test Flashcards
(21 cards)
Compare and contrast heterogeneous and homogeneous mixtures.
Heterogeneous mixtures have different pieces and looks, while homogeneous mixtures look the same throughout.
Give 3 examples of heterogeneous mixtures.
Trail mix, salad, smoothie.
Give 3 examples of homogeneous mixtures.
Kool-aid, chocolate ice cream, milk.
What are the two types of pure substances?
Elements and compounds.
Explain the difference between substance and mixture.
In a pure substance, all of the pieces are the same. In a mixture, there are different parts.
Name five examples of compounds.
H2O, CO2, NaCl, CH4.
How do you know if a substance is an element?
It is on the periodic table.
How are elements different than compounds?
Elements are only one type of atom, while compounds have more than one type of atom.
pure substances and same throughout are:
elements
chemically bonded, pure substance, the same throughout, have chemical formula are:
compounds
physically combined, not bonded, distributed evenly are:
homogeneous mixtures
physically combined, different parts of the mixture are:
heterogeneous mixtures
is saltwater a pure substance or a mixture? How do you know?
It is a mixture. I know this because they are physically mixed.
when you light a candle, what happens to the mass of all the atoms in the candle?
The mass of the candle itself with decrease but the mass that is “lost” turns into water vapor and smoke.
The mass before a chemical reaction and after a chemical reaction is _________________.
the same(equal)
what is a reactant?
the parts of a chemical reaction that you start with.
what is a product?
the things produced in a chemical reaction.
yield
y➡️x
In a chemical equation, how can you tell which is the reactant and which is the product?
the reactants are on the left of the yield. the product is on the right.
what is the law of conservation of matter?
matter can not be created or destroyed, ornly changed
what is the law of conservation of mass?
mass can not be created or destoryed, only changed. (grams)
