Endo or Exo
Conservation of Mass
Chemical Reactions
Chemical and Physical Changes
Random
100
Heat is a reactant in this type of reaction
What is an endothermic reaction
100
Describe the law of conservation of mass
No new atoms can be created or destroyed, they can only be rearranged.
100
Give an example of a chemical reaction
What is up to teacher :)
100
In this reaction, a solid becomes a liquid when heat energy is added. (Chemical or Physical)
What is a physical change?
100
In a chemical reaction, is it possible to change the amount of the products by changing the amount of the reactants? Why or Why not?
Yes if you increase or decrease the amount of the reactants, it will increase or decrease the amount of the products.
200
Heat is a product in this type of reaction
What is an exothermic reaction
200
A chemical reaction produces two new substances, and each product has a mass of 25g. What was the total mass of the reactants?
What is 50g
200
How many molecules of water are formed in the reaction: 2 H2O2 🡪 2 H2O + O2?
What are two molecules of water (H2O)?
200
In this reaction, a substance changes color and a burning smell is released. (Chem or Phys)
What is a chemical change?
200
What 2 things must remain the same on both sides of a chemical equation?
What is the number and type of atoms?
300
Give an example of an exothermic reaction
What is up to teacher :)
300
A chemical reaction occurs, one of the reactants has a mass of 35g. The product side is 100 g. What is the mass of the other reactant?
What is 65g
300
A teacher demonstrates a chemical reaction for the class. Which of these would NOT show evidence that a chemical reaction occurred? a) change in color b) change in shape c)formation of a gas
What is change in shape
300
In this reaction, there is a temperature decrease and a gas is produced. (Chem or Phys)
What is a chemical change?
300
What increases the rate of a chemical reaction?
What is increasing temperature and a catalyst?
400
In ________ reactions, energy must be absorbed to break bonds, and in ________ reactions, energy is released when making new bonds.
What is endothermic, exothermic.
400
When salt is mined, machines scrape the mine walls and change salt rocks into very tiny salt crystals. What happens to the mass of 1 kilogram of salt rocks when the rocks change into very tiny salt crystals?
What is the total mass stays the same?
400
Students combined baking soda and vinegar to demonstrate a chemical reaction. What would indicate that a chemical reaction occurred?
What is the formation of bubbles/gas?
400
List at least 4 indicators of a chemical change.
What are color change, gas is produced, smell is produced, the reaction is irreversible, temperature change?
400
Describe the Lewis Dot Diagram for Oxygen (which has 6 valence electrons)
What is the O symbol in the middle, two dots on the top and right of the O, and one dot on the left and bottom?
500
A sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature drops rapidly. What type of reaction has occurred?
What is an endothermic reaction
500
In a reaction with vinegar and baking soda, can you continue to add more and more of one reactant and expect to get more and more product? Why or why not?
No, if you continue to add more of only one reactant, it will eventually run out of the other reactant to react with.
500
When you combine vinegar and baking soda, a gas is produced. Why is the gas considered evidence that a chemical reaction occurred?
Gas is evidence because it was not part of the reactants. The reactants vinegar and baking soda when mixed, produce a gas which you can see by the formation of bubbles.
500
In a chemical reaction, CaOH (calcium hydroxide) and CO2 (carbon dioxide) are _________, CaCO4 (chalk) and H20 (water) are __________.
(products, reactants)
What are reactants and products
500
What is the difference between an ionic and covalent bond?
What is atoms transfer electrons in an ionic bond and share electrons in a covalent bond?