It's A Law!!!
This law states that matter cannot be created or destroyed during a chemical reaction.
What is the Law of Conservation of Matter/Mass
Define a physical change.
What is a change in a substance that does NOT change its identity.
What is the mnemonic used to remember indicators, or signs of a chemical change?
What is Never Give Elderly Old Cell Phones!
What types of substances are pure? Give an example of each.
What are elements and compounds such as water, carbon dioxide, aluminum,
3H2O The number of total atoms
9 atoms (6H and 3O)
An open system is one where gases are able to escape. Since gases have mass, I could not find the mass before and after a reaction in an open system to prove that mass is conserved. What should I do?????
What is count the atoms on both sides of the equation. They should be equal.
Which of the following is an example of a physical change? burning sugar, mixing vinegar and baking soda, dissolving sugar in water or putting an Alka-Seltzer tablet in water.
What is dissolving sugar in water! Dissolving is always a physical change. Both substances are still present. No new substance is formed.
What does the N stand for in Never Give Elderly Old Cell Phones?
What is New Substance! A new substance is ALWAYS formed in a chemical change. The other indicators may/may not be present.
Element, Mixture or Compound?---Chem Fight! Lemonade
What is a mixture!! Lemonade is just a mixture because I can separate it. The parts of the mixture keep their original properties. No new substance is formed. I can prove it by separating it. I can use that thing I used to separate the Kool Aid. Then, I can just evaporate the water out and the sugar will be left behind. Just a yummy mixture.
Na2CO3
The number of total atoms
6 atoms
A closed system is one where gases aren't able to escape. Since gases have mass, I could count the atoms on the reactant side of the equation and then on the product side of the equation and they will be equal. The only problem is, I don't know the equation. Is there another way to prove mass is conserved?
What is find the mass of the reactants before and then the mass of the products after the reaction. They will be equal.
What are the three methods of separating a mixture that we did in class?
What is magnetic attraction (for the iron filings), filtering (the sand out using the coffee filter), and evaporating (the water out of the salt water mixture).
What does the G stand for in Never Give Elderly Old Cell Phones?
What is gas production (unless it is a change of state like boiling)
Element, Mixture or Compound?---Chem Fight! Salt-NaCl
What is a COMPOUND!! It has a formula, so right away I know it has a fixed ratio. A fixed ratio would make it a pure substance, because all of the molecules will be the same. Since there are two or more capital letters, I know that there are two or more different elements bonded together. I know they are bonded because I cannot separate it easily into sodium and chlorine.
2NaHCO3
Total number of atoms
12
The number placed below an element's symbol in a chemical formula is called a ...
What is a subscript!
What is the biggest misconception when it comes to physical changes?
What is people think that a change of state is chemical, but it is NOT!! It is just physical because the substance hasn't changed. Only the amount of energy and closeness of particles. :)
What does the E and O stand for in Never Give Elderly Old Cell Phones?
What is Energy change (heat, light, or sound) and O odor.
The smallest part of an element that keeps the properties of that element is called ...
What is an atom?
3H2O2 Total number of atoms
12
Sing the Hokey Pokey Conservation of Matter Song.
What is You put reactants in, you get the products out, you put reactants in and you shake them all about. You're getting something different but the mass will stay the same. That's what it's all about (It's a law)!
Sing the physical song!
What is It's just physical, physical. It's just physical. Probl'y just a change of state. Or it could be change in shape (or change in size) either way it's still the same.
What does the C and P stand for in Never Give Elderly Old Cell Phones?
What is Color Change (unless it is dissolving), and P precipitate (a solid formed from two liquids).
The smallest part of a compound that keeps the properties of that compound is a
What is a molecule!!
3NaCl +3H2O Total number of atoms
15