Chemical Reactions
What is a sign that a chemical reaction has occurred?
Gas, light, temp, new substance, color change
What is the formula for glucose?
C6H12O6
Two types of equations?
Word & Chemical/Symbol Equations
Is this equation balanced?
Fe2O3 + Al → Fe + Al2O3
Exothermic reactions are where energy in the form of heat is;
released
Definition of a chemical reaction?
Reaction where a new substance is formed.
What is this compound?
Na2SO4
sodium sulfate
Compounds in a reaction on the left side of the arrow are the ________, on the right side of the arrow they are called the ________.
Reactants, products.
Basic principle for making sure that chemical equations and number of atoms are balanced?
Law of Conservation of Matter
Which of cell respiration or photosynthesis is endothermic?
Photosynthesis
Which chemical reaction combines simple elements/compounds into bigger, more energetic compounds?
Synthesis
What is the formula for dihydrogen monoxide?
H2O
The subscripts tell you what about chemical equations?
The number of atoms of each atom or ion in a formula
The numbers that we can add into equations at the start of chemical formulas are called?
Coefficients
In both endo and exothermic reactions, energy is taken in / released in the form of;
The breakdown of hydrogen peroxide is a chemical reaction called?
Decomposition
Which element is found in NaOH?
nitrogen , nobelium, sodium, hydroxide
sodium - Na
Symbol equation for the following worded equation?
carbon monoxide + water -> carbon dioxide + hydrogen
CO + H2O -> CO2 + H
How many potassium, oxygen and hydrogen atoms, respectively, there are on the product side.
2 K (s) + 2 H2O (l) → 2 KOH (aq) + H2 (g)
2, 2, 4
During an exothermic reaction the temperature of the surroundings;
Increases
What type of reaction is shown here?
LiCl + Br2 -> Li Br + Cl2
Single displacement
or single replacement
A symbol stands for an element,
A formula stands for a _________
compound
What symbol means 'yields' or 'produces'?
the arrow -->
Balance this equation?
N2 + H2 -> NH3
N2 + 3H2 -> 2NH3
Energy is released when the reaction breaks --- and energy is absorbed when the reaction makes new ---.
1. Break bonds
2. Make new bonds