The structure of matter
Clue: These are the fundamental building blocks of matter, including protons, neutrons, and electrons.
atoms
Clue: This type of chemical reaction occurs when two or more substances combine to form a new compound.
Formation
Clue: The elements in this vertical column of the periodic table are highly reactive and include lithium, sodium, and potassium.
alkali metals
Clue: This is a common sign of a chemical change, in which a substance releases energy as heat or light.
exothermic reaction
Clue: This number (6.02 × 10²³) is used to represent the number of atoms or molecules in one mole of a substance.
avagadros number
Clue: This scientist is known for proposing the idea that matter is made of indivisible atoms.
John Dalton
Clue: This law states that mass is neither created nor destroyed in a chemical reaction.
Law of conservation of mass
Clue: This family of elements, found in Group 17, contains reactive non-metals like chlorine and iodine.
halogens
Clue: This is the formation of a solid from two liquids during a chemical reaction.
precipitate
Clue: This is the amount of a substance that contains 6.02 × 10²³ particles.
the mole
Clue: This model of the atom, proposed by J.J. Thomson, describes electrons embedded in a positively charged substance.
Plum pudding model
Clue: This type of reaction involves the burning of a fuel, typically producing carbon dioxide and water.
combustion
Clue: This system of naming compounds is essential for clear communication among scientists, particularly in the naming of ionic compounds.
IUPAC
Clue: This process, like photosynthesis, absorbs energy in the form of heat from its surroundings.
endothermic
Clue: This is the total mass of one mole of a substance, calculated by adding up the atomic masses of its constituent elements.
molar mass
Clue: This element, discovered by Rutherford, is the dense, positively charged center of the atom.
nucleus
Clue: This type of reaction involves the exchange of ions between two compounds.
Double replacement
What is the formula for sodium phosphate
Na3PO4
Clue: This is a visual or measurable change in a substance’s chemical identity, such as a color change or formation of gas.
evidence of chemical change
calculate the molar mass of magnesium borate
190.53 g/mol
Clue: The development of this atomic model introduced the concept of electrons orbiting in fixed energy levels.
Clue: The development of this atomic model by Niels Bohr introduced the concept of electrons orbiting in fixed energy levels.
Clue: How do we balance equations?
Ensure there is the same number of each element on product and reactant side
What is the name of
Fe2(SO4)3
iron (III) sulfate
Clue: This set of guidelines is designed to ensure safe handling, storage, and disposal of chemicals in laboratories.
WHMIS
calculate the number of moles if there are 12500 particles
2.076x20-20