Chemical Vs Physical Changes
A physical change is a change in what?
A change in form but not substance
What are the three primary states of matter?
Solid, Liquid, and Gas
What does the Law of Conservation of Matter State?
Matter cannot be created or destroyed, it only changes form
What do the letters in a chemical formula represent?
Elements from the Periodic Table of Elements
Homogeneous means what?
same throughout or uniform
Instant Ice Packs are what kind of change and how do you know?
Chemical because the mixing their ingredients results in change in temperature
What is a primary trait of solids?
Tightly packed particles
Definite shape and volume
If you combine 200g of H2O with 50g of NaCl, what should the products mass be?
250g
A chemical formula details what?
A compound/molecule and the atoms that are bounded to make it
What is a mixture?
physical combination of different things or substances
Name 3 signs of chemical change?
Any 3 of color, gas, precipitate, odor, temperature, light
How do the particles in a liquid move?
They are close together but can move and slide past each other
How can you know a reaction's equation is balanced?
Counting the atoms on each side (reactants and products), they should be equal
The large number in front of a chemical formula such the '3' in 3CO2 means what?
That there are 3 of the whole molecule
Solutions are a special type of mixture, are they homogenous or heterogeneous or can they be both?
They can only be homogenous
Is dissolving a solute into solvent a physical change or chemical change?
Physical
The transition point from solid to liquid is called what?
Melting point
Is this equation balanced?
CO₂ + H₂O → C₆H₁₂O₆ + O₂
No, the atoms on the reactants side don't match the product side
How many elements are in C6H12O6 ?
3; Carbon, Hydrogen, and Oxygen
Remember if someone asks how many elements, count the capital letters
In a mixture of of liquids of different densities will it be homogenous or heterogenous
Heterogeneous, they will separate based on the density
A compound can be separated by what?
Chemical change
Which state of matter generally has the highest density?
Solid
Why did we experiment with closed systems when exploring the bath bomb reaction?
Because we were investigating the gas produced and needed to see if the mass changed to prove it was matter that was there transformed
In the formula for photosynthesis, how many atoms are in the product?
6CO₂ + 6H₂O + Light Energy → C₆H₁₂O₆ + 6O₂
36; 6 Carbon, 12 Hydrogen, and 18 Oxygen
Remember if asked for number of atoms, multiply coefficient by each subscript and add. Any where there is not a coefficient or subscript are the same as a 1
Which is easier to separate physically, homogeneous mixture or solution?
Homogeneous mixture