Systems & Conservation of Mass
Atoms
Everything Matters
Chemical Reactions
Mixtures & Solutions
100
In an open system, what can enter or leave the system?
matter
100
The smallest part of a substance that cannot be broken down chemically
Atom
100
The 3 states of matter
solid, liquid, gas
100
In a closed system the mass of a chemical reaction will decrease
false
100
What is a mixture?
A combination of two or more substances that are physically combined and can be separated.
200
What does the Law of Conservation of Mass say?
Mass cannot be created or destroyed, only changed in form.
200
The 3 subatomic particle that make up an atom
protons, neutrons, electrons
200
Draw a Model of a gas
200
When a chemical reaction occurs new matter is created? True or False, explain if false
False, the matter is transformed into a new substance
200
What type of mixture looks the same throughout — like salt water?
A homogeneous mixture or solution.
300
During a chemical reaction, the total mass of the reactants equals the total mass of the
products
300
This subatomic particle has a negative charge
electrons
300
matter is made up of tiny ____________
particles
300
a substance that is present at the beginning of a chemical reaction and undergoes a change to form a new substance
reactant
300
In a solution, what do we call the substance that gets dissolved?
The solute.
400
Give an example of an open system you see every day.
Answers may include: a boiling pot of water, a living organism, or the Earth’s atmosphere.
400
Where are protons and neutrons found in an atom?
nucleus
400
What happens to the particles of a substance when it changes from a solid to a liquid?
the spread apart and move faster
400
characteristics of a substance that don't change. Give one example
Properties
400
What is the difference between a heterogeneous and a homogeneous mixture?
A heterogeneous mixture has visibly different parts, while a homogeneous mixture looks the same throughout.
500
In a closed system, if you mix vinegar and baking soda and trap the gas, how will the mass change after the reaction?
The mass will stay the same, showing conservation of mass.
500
Draw a model of an atom with labels or a key
500
What do we call the process when a liquid turns into a gas?
evaporation or boiling
500
less dense substances ___________ and more dense substances __________.
rise : sink
500
When you mix sugar in water and it dissolves, is this a chemical or physical change — and why?
It’s a physical change because the sugar’s identity doesn’t change; it can be recovered by evaporating the water.