The Atom
Periodic Table
Chemical Reaction
Chemical Reaction(Continued)
Changing the rate of Change
100
What is an atom?
An atom is the smallest particles into which element can be divided and still be the same element.
100
What is the Periodic Table? Who created it?
Russian chemist named Dmitri Mendeleev began thinking about how he could organize the elements based on their properties when he arranged the elements card in order of increasing atomic mass, the properties of those elements occurred in a periodic, they called it periodic Table.
100
What is a chemical reaction?
A chemical reaction is a process in which atoms arranged to produce new substances.
100
What is conservation of mass?
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
100
What is one way to change the rate of Change? Explain?
Start with C.
At high concentration, there are more reactants in a given volume, the reactants are more likely to collide and react.
200
What are electrons? Who found it?
In 1897, J.J. Thomson discovered particles within the atom that has a negative charge, known as electrons.
200
What are metal, nonmetals, and metalloids?
Metals- Metals are elements that are shiny and conduct heat and electricity well.
Nonmetals- NOnmetals are poor conducts of heat and electricity and often dull and brittle.
Metalloids- Metalloids are elements that have some properties of metals and some properties of nonmetals.
200
What is Chemical Formula?
A chemical formula uses chemical symbols and numbers to represent given substances.
200
what is conservation of energy?
In physics, the law of conservation of energy states that the total energy of an isolated system remains constant, it is said to be conserved over time.
200
What is one way to change the rate of Change? Explain?
Start with S
The reaction rate increases when more reactant particles are exposed to one another, crushing or grinding solids increases their surface area and the reaction rate.
300
What is Nucleus or Protons? Who discovered it?
Ernest RUtherfod suggested that atoms have a nucleus which is a small, dense center that has a positive charge, he also called it Protons.
300
What is a group in the Periodic table?
Each vertical column of elements on the Periodic Table is called a group.
300
What is Chemical equation?
A chemical equation is an expression that uses symbols to show the relationship between the starting substances and the substances that are produced by a chemical reaction.
300
What in an endothermic reaction?
The term endothermic process describes the process reaction in which the system absorbs energy from its surroundings, usually in the form of heat.
300
What is one way to change the rate of Change? Explain?
Start with T
The reaction usually occurs faster at a higher temperature because of the reactants particles more quickly, they are more likely to collide and react.
400
What is the difference between Atomic Mass and Atomic number?
Atomic Number- The number of protons in the nucleus of an atom is the Atomic numbers of that atom.
Atomic Mass- The total number of protons and neutrons in an atom's nucleus is its mass number.
400
What is a period in Periodic Table?
Each horizontal row of elements on the periodic table is called a period.
400
In the given equation, what are the Reactants and Product?
C+O2 ------> CO2
Carbon and oxygen are the reactants: the substances that participate in a chemical reaction.
Carbon Dioxide is the product: The substances formed in a chemical reaction.
400
what in an exothermic reaction?
An exothermic reaction is a chemical reaction in which less energy is needed to break bonds in the reactants than is released when new bonds form in the products.
400
What is one way to change the rate of Change? Explain?
Start with C
A catalyst is a substance that changes the rate of a chemical reaction without being used up or changed very much, the catalyst can increases reaction rate by bringing together reactants.
500
What is Neutrons? Who discovered it?
Chadwick discovered that the nucleus contains uncharged particles called neutrons. This suggested that electrons move within an area around the nucleus called the electron cloud
500
What is group 18 element family called?
It is called Noble gases.
500
Where are coefficient and subscript in a Chemical Formula?
500
What does chlorine do for our human body?
CHlorine controls the growth of such unwelcome bacteria as E-coli and Giardia.
500
What is Enzymes?
Enzymes are a type of catalyst found in living things.