Physical or Chemical?
An ice cube melts into water
Physical
In this state of matter, particles have a defined shape and volume. They have low energy and can only vibrate in place.
Solid
The state change when a solid turns into a liquid.
Melting
Products or Reactants: The substances that are created in a reaction.
Products
How many atoms of Oxygen will be in the products when hydrogen peroxide breaks down?
H2O2 --> ?
2
A bike gets rusty
Chemical
In this state of matter, particles take the shape of the container they are in and can flow or slide past each other.
Liquid
In order for a liquid to turn into a solid, particles have to (speed up / slow down)
Slow down
Products or Reactants: The substances that start a reaction.
Reactants
In an experiment, an open beaker has a mass of 14 g. After the reaction the beaker has a mass of 11 g. Was this system open or closed?
Open
Wood easily catches on fire
Chemical
This state of matter has the least energy
Solid
Dry ice is an example of ___________ because a solid turns directly into a gas.
Sublimation
List the products:
Mg + O2 --> MgO
MgO
Define the Law of Conservation
Mass cannot be created or destroyed.
A popcorn kernel floats in water because it is less dense than the water
Physical
This state of matter has the most energy of all the states.
Gas
In order to vaporize into a gas, a liquid has to (gain / lose) energy.
Gain
List the reactants:
NaCl --> Na + Cl
NaCl
If there are 5 atoms of carbon in the products, how many atoms of carbon are in the reactants?
5
Water boils at 100 degrees celsius
Physical
In this state of matter, particles fill up the space they are in and move freely.
Gas
A solid turns into a liquid by gaining energy and speeding up.
Melting
True or false: the products in a reaction have the same properties as the reactants.
False
If the reactants in a reaction have a mass of 57 g, what will be the mass of the products? Assume the system is closed.
57 g