Structure of Atoms
The Greek Philosopher Democritus proposed what idea?
Matter was made up of atoms
Group 17 of the Periodic Table is comprised of what?
Halogens
Where do you place the coefficient in a chemical equation?
In front of reactant or product
6.02×1023
Avogadro's number
A change which alters a substance without changing its chemical composition is called what?
Physcial Change
What particles are located inside the nucleus?
Protons and neutrons
Most metals are are malleable and ductile. True or False.
True
A + B→AB. What type of reaction is this?
Synthesis reaction
The mass in grams of one mole of any pure substance is called what?
Molar mass
Another name for homogenous mixture
Solutions
Atoms with the same number of protons but different numbers of neutrons are called what?
Isotopes
What has physical and chemical properties of both metals and nonmetals?
Metalloids
What happens in a decomposition reaction?
The product breaks down into two or more compounds or elements.
What is the molar mass of H2O?
18.02
Which law states that mass is neither created nor destroyed during a chemical reaction, but instead conserved?
Law of conservation of mass.
Name the particles in an Alpha particle and how much of each there are in it.
Two protons and Two neutrons
John Newlands created what law?
Law of Octaves
A solid produced during a chemical reaction in a solution is called what?
Precipitate
What is the formula with the smallest whole-number mole ratio of that element?
Empirical formula
Does Density belong to Physical properties or Chemical properties?
Physical properties.
State what happens in a Radioactive decay.
The nuclei loses energy by emitting radiation. The atoms continue this until they form stable atoms.
The noble gases are located in which group?
Group 18
When the positive and negative ions of two compounds switch places, what type of reaction would this be?
Double-Replacement reaction
Anhydrous compounds are formed when what?
The hydrates are heated
Who invented the first Periodic Table?
Dmitri Mendeleev