What is valence electrons determine how the atom will react (who it will bond with). Atoms want to have full outer energy levels (octet rule).
100
If you dissolve an Alka-Seltzer in a bottle with the lid CLOSED, what will happen to the mass?
What is it will stay the same because the system is closed, trapping the gas.
100
If energy can be neither created not destroyed, then how can a reaction release heat?
What is the some of the chemical energy that was stored in bonds of the reactants transforms into thermal energy that is released when the products are formed.
200
What is the atomic number of Carbon?
What is 6?
200
How many neutrons does Fluorine have?
What is 10?
200
In a chemical equation, what is the arrow called?
What is the yield sign?
200
When you OPENED the lid of the bottle containing the Alka-Seltzer, the mass decreased. Why?
What is the system became open and the gas escaped into the environment.
200
Is the reaction inside of hand warmers endothermic or exothermic?
What is exothermic?
300
What is the symbol for Helium?
What is He?
300
Name one trend found across periods.
What is: Atomic number increases by one.
Atomic mass increases.
All elements in a period have the same number of
energy levels.
Number of valence electrons increases.
300
What are the atoms called on the left side of a chemical equation?
What are the reactants?
300
In the following chemical reaction, how many Magnesium atoms are on the reactant side?
2Mg + O2 → 2MgO
What is 2?
300
Look at the arrows in the reaction that Ms. Newsome is holding, is the reaction endothermic or exothermic?
What is exothermic?
400
On your own paper, draw the energy level model for Sodium.
2 electrons on first level
8 electrons on second level
1 electron on third level
400
Name one trend found in families/groups.
What is: Members of the same family have similar reactive properties.
Number of energy levels increase by one (size increase).
Atomic number and atomic mass increases.
Density increases.
400
In a chemical reaction, what are the atoms on the right side of the equation called?
What are the products?
400
In the following chemical reaction, how many oxygen are on the product side of the equation?
2Mg + O2 → 2 MgO
What is 2
400
What form of energy is stored in the bonds between atoms in a compound?
What is chemical energy?
500
How many valence electrons does chlorine contain?
What is 7?
500
Look at the model Ms. Newsome is holding and identify the element.
What is nitrogen?
500
If atoms cannot be created or destroyed, then how are new substances formed on the product side of a reaction?
What is The bonds of the reactants are broken and the atoms simply rearrange and form new bonds to make the products.
500
In the following chemical reaction, how many chlorine atoms are on the product side of the equation?
2Na + Cl2 -> 2NaCl
What is 2?
500
Is the reaction that occurs in a self-inflating balloon (Alka-seltzer and water in a ziplock bag) endothermic or exothermic?