Atomic Structure
The Law of Conservtion of Mass
Chemical Reactions
Endothermic or Exothermic
Energy
100
Name any chemical compound.
Ex. - water, NaCl, HCL, Co2, etc....
100
What is the definition of the Law of Conservation of Mass?
Matter can not be created or destroyed.
100
What is the best indicator that a chemical reaction has occcured?
Formation of a new substance
100
What process is water freezing?
Exothermic
100
What is the formula for K.E.?
K.E. = 1/2 M X V2
200
What describes 3 atoms of oxygen chemically bonded?
Molecule
200
This is the chemical reaction that occurs when propane combusts. In the reaction, for every molecule of propane used how many molecules of oxygen gas are needed?
5
200
Which of the following is evidence of a chemical reaction?
A) the light produced by magnesium when burned
B) evaporation of water from a solution
C) fizzing of a soft drink
D) Heat from a light bulb
A
200
When a reaction that is taking place in a beaker needs to be kept on ice to slow down the reaction, what type of reaction must be taking place in the beaker?
Exothermic Reaction
200
What is the formula for P.E.
P.E. = M x G x H
300
The chemical formula for methane is CH4 and a model of its structure is shown. What does the model represent?
1) atom
2) chemical
3) molecule
4) ion
3
300
If a chemical reaction occurs in a closed beaker what would you expect the mass of the container to be after the reaction?
The mass should remain the same after as it was before the reaction.
300
In a chemical reaction, if there is a color change, the production of gas and an odor, what has most likely occurred?
Chemical Reaction
300
What is the following reaction?
Endothermic
300
If 4 objects of different masses are all dropped from identical heights, which object will have the greatest kinetic energy when it his the ground?
Object with the greatest mass
400
What does the circled part of the diagram represent?
Atom/Element
400
What must be true of the mass of the reactants and products of a balanced chemical reaction?
Must be the same
400
Which of the following is an example of a chemical change?
A) heating a block of ice to form liquid water
B) heating tungsten wire until it glows brightly
C) adding sugar crystals to water to form a clear, colorless liquid
D) passing an electric current through water to form hydrogen and oxygen
D
400
Which type of reaction has more energy in the products than were in the reactants?
Endothermic Reaction
400
What is the Kinetic energy of a 4 kg cart pushed at 1 m/s?
2 Joules
500
How many Oxygen atoms are required for the following chemical reaction to occur to form rust?
6
500
Balance this chemical equation.
Balanced (Yes/No)
500
Daily Double!!!!!!!!
Bid what you want then answer my question.
Correct (Yes/No)
Points accordingly
500
Cellular Respiration would be an example of what type of chemical reaction? (Endothermic or Exothermic)
Exothermic
500
According to P.E. formula if you drop 3 items from different heights. (All have the same mass) Which object has the greatest potential energy?
Object with the greatest height.