Exothermic Reactions
Endothermic Reactions
Reactions of Metals and Oxygen
Reactions of Metals and Water
Reactions of Metals and Acid
100
TRIVIA
What is the process by which plants lose water through their leaves called?
Transpiration
100
TRIVIA
Write pi with as many digits as you know.
Group with the most correct digits gets the points.
3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803
100
TRIVIA
What is the scientific name for a virus that infects and replicates within bacteria.
Bacteriophage
100
Trivia
Which blood type is known as the universal donor?
O negative
100
Trivia
Which organ in the human body produces insulin?
Pancreas
200
A student add chemical A and chemical B and sees bubbles form indicating that a chemical reaction has occurred. How can they determine whether the reaction is exothermic or endothermic?
Measure the starting and ending temperature.
If temperature increases, it is exothermic.
If temperature decreases, it is endothermic.
200
A student combines two chemicals and noticed the temperature decreases. How can they tell if this was an endothermic process or reaction.
If it is a chemical reaction it will show one of the indicators (e.g. color change, gas production, odor production, etc.)
200
What is another name for a "burning" reaction.
Combustion
200
Sodium is added to water and bubbles are seen. The gas is collected in a testtube and Mr. Aidan says the gas is Hydrogen. Manta does not believe him. How can he test if Mr. Aidan was correct.
Squeaky pop test
200
List any three properties of acids.
Think back to year 7 science.
ph < 7
Corrosive
Sour
300
Photosynthesis and respiration are both vital chemical reactions for plants. Which of these reactions in exothermic?
Respiration - it releases energy
Photosynthesis absobs energy (endothermic)
300
What is a real-world application of an endothermic reaction or process?
Cold packs, sherbert candy, boilng water to cook, baking, cooking, dissolving salt in water, etc.
300
What are the three things needed for a combustion reaction?
300
Why are some metals stored under oil?
To prevent them from being in contact with, and reacting with, the oxygen and water in the air.
300
Some metals are too reactive to safely add to dilute acids. List one of these metals.
Any alkali metal
Sodium, potassium, etc.
400
A student combines two chemicals that results in an exothermic reaction. If the starting temperature of the reactants is 22° C, what is a possible final?
Any value greater than 22° C
400
Is breaking bonds or forming bonds endothermic?
Breaking bonds is an endothermic process. It requires an input of energy to break the bonds.
400
What is a method that can be used to prevent a nail from rusting.
Galvanizing it, painting it, controlling the environment the nail is in - using a dehumidifier (removes moisture from the air)
400
Write the word equation for:
1. Potassium + water (l)
2. Magnesium + water (g)
1. Potassium hydroxide + hydrogen
2. Magnesium oxide + hydrogen
400
Zinc is added to three different acids. Names the salt formed in each:
a. Nitric acid
b. Hydrochloric acid
c. Sulfuric acid
a. Zinc nitrate
b. Zinc chloride
c. Zinc sulfate
500
List 2 phase changes that are exothermic processes.
Freezing, condensing, deposition
500
This is an energy profile showing the energy of the reactants and products in a chemical reaction. Does this profile show an endothermic or exothermic reaction?
Exothermic
The reactants have more energy than the products. This extra energy was released to the surroundings.
500
Write out the word equation for a nail rusting.
Iron + oxygen ---> iron oxide (rust)
The iron must be wet, but water is not used in the reaction so it is not a reactant.
500
A metal is added to water and no reaction occurs. However, when placed in steam a reaction does occur. Use particle theory to explain why.
When the metal is added to cold water, the water particles have less kinetic energy and move more slowly. They do not collide with the metal surface with enough energy or frequency to start a reaction.
When the metal is placed in steam, the water particles have much more kinetic energy because they are at a higher temperature. They move faster and collide with the metal surface more often and with greater energy. These more frequent and energetic collisions allow the reaction to occur.
500
What is a simple chemical reaction you could do to make table salt?
Add sodium to hydrochloric acid
Or a neutralization reaction with hydrochloric acid and sodium hydroxide