Chemical Equation To Represent Reaction Flashcards
(19 cards)
What are the three ways to indicate chemical reactions?
Chemical reactions can be indicated by making models, using word equations, or by making use of chemical equations.
What occurs during a chemical reaction?
Chemical reactions occur when elements and/or compounds combine to form new substances.
What are reactants and products in a chemical reaction?
Reactants are the substances that react with each other, and products are the substances that are formed during the chemical reaction.
How are reactants and products represented in a chemical equation?
Reactants are to the left of the arrow, and products are to the right. An arrow is used, not an equal sign.
What is the law of conservation of mass in chemical reactions?
No atoms are lost or gained; they are simply rearranged, meaning the number of atoms of each type on the left should equal those on the right.
How can models be used to represent reactions?
Models can be made using a molecular model set, beads, or play dough to show how reactants rearrange to form products.
What is an example of a reaction that forms water?
When hydrogen gas burns in air containing oxygen, it forms water.
What are the reactants and products in the formation of water?
Reactants: H (hydrogen), Products: H2O (water).
What is an example of a reaction that forms carbon dioxide?
When coke, a form of carbon, burns in air containing oxygen, carbon dioxide is produced.
What are the reactants and products in the formation of carbon dioxide?
Reactants: C (carbon), Products: CO2 (carbon dioxide).
What is a word equation?
A word equation uses words to represent what happens during a reaction with elements and compounds.
How is the formation of water represented in a word equation?
hydrogen + oxygen → water
What is a chemical equation?
A chemical equation uses symbols and formulas to represent reactions.
What is the chemical equation for the reaction of hydrogen and oxygen to form water?
2H2 + O2 → 2H2O
How can the reaction of carbon and oxygen be represented?
carbon + oxygen → carbon dioxide
What is the chemical equation for the reaction of carbon and oxygen?
C + O2 → CO2
What do the subscripts in chemical formulas indicate?
The subscripts indicate the number of atoms of each element in the compound.
What do the numbers in front of formulas indicate?
The numbers indicate the ratio in which the molecules react.
What is the diatomic nature of hydrogen and oxygen?
In nature, the atoms of these gases react in pairs of two and therefore exist as diatomic molecules.
