Crazy
The substances to the right of the arrow in a chemical reaction.
What are products?
The two parts of a chemical reaction.
What are reactants and products?
A substance that enters a chemical reaction.
What is a reactant?
The law of conservation of mass says...
Matter cannot be created or destroyed in a chemical question.
An atom of the element with atomic number 6 always has this many protons.
What is six?
hydrogen + oxygen → water
The reactants in this chemical reaction.
What are hydrogen and oxygen?
What is the subscript in this chemical formula H2O?
2
The number of Aluminum atoms in the product.
Al + O2 → Al2O3
What is two?
The number of oxygen atoms in the formula 5CaSO4
What is 20?
An equation with the same number and elements of atoms on each side of the arrow.
What is a balanced equation?
(Balanced or not balanced)
P4 + O2 → P4O6
What is not balanced?
The substances to the left of the arrow in a chemical equation.
What are reactants?
(Balanced or not balanced)
H2S + NaCl → HCl + Na2S
What is not balanced?
A chemical reaction where heat is absorbed.
What is endothermic?
8
Define a molecule
A substance that consists of two or more atoms, chemically bonded together.
What does the arrow (-->) tell us in chemical equations?
The direction of the reaction occurs from reactants to products
What does the subscript tell us in a chemical formula?
The number of atoms of the element before it
A symbol that is used to divide the reactants and products in a chemical reaction.
Arrow
Temperature change, light, gas formation, precipitate formation, change in color or odor.
What are signs of a chemical change?
What are the names of the subatomic particles found in the nucleus?
What are protons and neutrons?
What does the coefficient in a chemical formula indicate?
The number of molecules in the forumula.
All of the following are examples of chemical change except:
Increase in temperature, release of light, formation of a solid, melting of ice.
What is the melting of ice?
Name 3 observations that indicate a chemical reaction occurred?
-unexpected color change
-temperature change
-gas/smell production
-light/sound production
-energy/heat change
The measure of the average kinetic energy of the particles
What is the temperature?