Let's react
What are 2 indicators that tell you that a chemical reaction has taken place?
color change, formation of a gas, precipitate formation, heat or light formation, temperature change, odor
Al2S3 how many of each atom are in this equation?
2 Al and 3 S
a push or a pull is called a
force
The SI unit for measuring distance is
meter
The tendency of an object to resist any change in its motion is called
inertia
In an exothermic reaction, energy is released or absorbed?
released and feels hot to the touch
We balance equations because of the law of conservation of
mass
4N to the left and 9 N to the right is a balanced force true or false
false it is unbalanced
What converts mechanical energy into electric energy?
generator
The force of gravity acting on an object is the object’s
weight
Mg(OH)2 + H2SO4 -> MgSO4 + 2H2O what type of chemical reaction is this ?
double replacement
Is the following reaction balanced CH4 + O2 → CO2 + H2O
no
a __________solution is one that is holding its maximum amount of solute at that temperature
saturated
A high wave frequency will have what kind of wave length?
short
An object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force is which of newton's laws?
1st
What type of chemical reaction is this - Al2O3 -> Al + O2
decomposition
Balance the following equation Pb(NO3)2 + NaI → NaNO3 + PbI2
Pb(NO3)2 + 2NaI →2 NaNO3 + PbI2
If you stir, heat, or crush the solute, the rate of dissolving will [increase or decrease?].
increase
A balanced force will have a change in motion true or false
false
For every action there is an equal an opposite reaction is which of newton's laws?
3rd
What type of chemical reaction is the following Fe + H2O -> Fe3O4 + H2
single replacement
Balance the following equation -Al2O3 -> Al + O2
2Al2O3 ->4 Al +3 O2
A ______ turns litmus paper blue.
base
Displacement is a scalar or vector? Why?
vector because is has a direction
The acceleration of an object is equal to the net force acting on the object divided by the object’s mass or F=ma - is which of Newton's laws?
2nd law