Reactions Test Flashcards
(35 cards)
Example of chemical reaction
Burn a piece of paper, you can’t get the piece of paper back
What are reactants?
The original substances in a reaction
What are products
The new substances formed in a reaction
What’s an indication that new substance is produced
Color change
What’s a chemical equation?
A symbolic description of a chemical reaction
What are chemical formulas
Represent reactants and products
What are examples of chemical formulas
Polyatomic ions, hydrogen H2, oxygen O2, H2O water
What does the plus sign do in a chemical formula
Separates multiple reactants or multiple products
What is the arrow in a chemical formula
Separates reactants from products, splits equation in two halves
Yields or produces
H2+O2->H2O is an example of
Chemical equation with chemical formulas
What do state of matter symbols do
Indicate if a substance exists as a solid, liquid, gas, aqueous, or precipitiate
What are the state of matter symbols (Solid, liquid, gas, aqueous, precipitate)
S, l, g, aq, ppt
What does aqueous and precipitate mean
Dissolved in water (aqueous)
Solid formed in chemical reaction (precipitate)
What’s the memory trick for diatomic molecules
HON-7
What are coefficients
Represent the relative amounts of reactants and products
Represent the number of molecules or moles of a substance
What’s the law of conservation of mass
Mass is neither created nor destroyed in normal chemical reactions
(Reworded) the total mass of reactants equals the total mass of the products equals the same number of atoms
BALANCED EQUATIONS FOLLOW THIS RULE
Know how to…
Balance equations
In terms of energy content, what are the two kinds of reactions
Exothermic, endothermic
What’s an exothermic reaction?
A reaction in which energy is released to the surroundings , the temperature of surroundings increases (gets hotter), the energy content of products is less than energy content of the reactants
Know how to draw
Exothermic reaction charts
What’s an endothermic reaction?
A reaction in which energy is absorbed from the surroundings , the temperature of the surroundings decreases, the energy content of products is greater than the energy content of the reactants
Know how to draw…
Endothermic reaction charts
What’s a synthesis reaction
Combine
Combine multiple substances to produce single, more complex, product
What’s a decomposition reaction
The breakdown of a single compound to produce two or more simpler substances
1 reactant
