Indicators of Chemical Reactions and Chemical vs. Physical Change
When atoms in molecules unbond from each other and bond with new atoms to form a new chemical.
What is a chemical reaction?
In the equation CH4 + O2 => CO2 + 2H2O, CH4 and O2 are.....
What are reactants
What V represents in the equation D = M/V
What is volume?
Changes to matter that do not create new chemicals. For example, freezing or state changes, cutting or changing the shape of a material.
What is a physical change?
How many different types of atoms are in a chemical with the formula C6H7O8?
What are 3: Carbon (C), Hydrogen (H), Oxygen (O)
the definition of density is
how many particles packed into a space/the amount of mass in a given volume
a solution must have
a solute and a solvent
Is burning a house down a physical or chemical change?
chemical change- new chemicals, production of gas, production of light and energy (fire), temperature change, odor, etc
50g of water and 100g of baking soda are reacted. What is the mass of the products?
150g
The behavior of a solid with a measured density of .8g/mL in a saline solution with a measured density of 1.4g/mL.
What is buoyancy?
What are the solute is insoluble in the solvent and/or the solution is saturated?
List at least 5 of the 6 indicators of chemical change
What is production of a gas, temperature change, color change, production of light/electricity/fire, formation of a precipitate, odor
For the reaction of CH4 + O2, give the number of atoms in the products.
What is 7?
The change in the density of a medium that would cause an object to become more buoyant.
What is increasing the medium's density?
The reason why saturation increases when the thermal energy of a solvent increases.
What is the particles collide more and spread farther apart.
Why is dissolving NOT a chemical reaction?
It can be reversed (solutes can be recovered), new chemicals are not created, etc.
Balance the following equation with a coefficient
2N2 + __O2 => 2N2O5
What is 5?
for something to float in a liquid, it always need to be?
what is less dense than the liquid its in
The reasons that dissolving is not a chemical change.
What are: New chemicals are not produced, the solute can be recovered through precipitation and recrystallization?