Vocab
The amount of space that something takes up
What is volume?
Mass / Volume
What is the equation for density?
Order the states of matter from least to most dense
Gas (least dense), liquid, solid (most dense)
The substances on the left side of a chemical equation
What are reactants?
The amount of particles that make up a substance
What is mass?
Volume x Density
What is the equation for mass?
What are 3 common units we use to measure volume?
Liters (L), milliliters (mL), and cubic centimeters (cm3)
The number that is placed in front of an element symbol in a chemical equation
What is a coefficient?
The mass per volume of a substance
What is density?
Reaction + Reaction --> Product + Product
What is the formula for chemical equations?
Why is density a size-independent property?
Density does not depend on the size of an object. For example, two cups of water of different sizes have the same density.
The substances that are made by a chemical reaction
What are products?
A process of atoms rearranging to form new substances
What is a chemical reaction?
Is this equation balanced? Why or why not?
2 H2 + O2 --> 2 H2O
It is balanced! There are 4 H atoms on each side of the equation and there are 2 O atoms on each side of the equation
What are 4 signs that a chemical reaction has occurred?
Smell, changes in temperature, light or sound
A number that goes below and to the right of an element symbol in a chemical equation, meant to show the number of atoms of that element
What is a subscript?
The idea that the total mass before a chemical reaction is the same as the total mass after the reaction
What is the law of conservation of mass?
Is this equation balanced? Why or why not?
CH4 + O2 --> H2O + CO2
It is NOT balanced, because there are 4 H atoms on the reactants but only 2 H atoms on the products
Reactants + Thermal energy --> Products
What is the formula for endothermic reactions?
A chemical reaction when more energy is released than the energy that gets absorbed
What is an exothermic reaction?