Periodic Table
How many elements are found on the periodic table?
118
The simplest form of matter is the
Atom
What is an atom?
An atom is the basic unit of matter.
From the below equation, which side is the reactant?
Mg + O2 ------> MgO
Magnesium + Oxygen -------> Magnesium oxide
The left side (Mg + O2)
Reactions that release energy/heat/light.
Exothermic
What is atomic mass ?
total weight of protons and neutrons
What is a molecule?
A molecule consists of two or more atoms of the same element
Which subatomic particle sits outside the nucleus of an atom?
Electrons
True or False. Is the following equation balanced?
CH4 + O2 > CO2 + H2O
False
What type of change produces a new substance and what type does not?
Chemical change = new substance
Physical change = No new substance
What does the atomic number mean?
How many protons a particular element has within each atom.
What is a compound?
A compound consists of two or more types of elements chemically combined in a fixed proportion
Any material that is composed of only one type of atom is called what?
An Element
An atom with 8 protons, 8 neutrons, and 8 electrons is an atom of this element.
Oxygen
What is photosynthesis an example of?
Endothermic reaction (Heat is absorbed)
What is an element ?
A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions.
Give an example of a compound using oxygen
Compound = H2O or Co2
What charge does an atom hold?
The number of electrons surrounding the nucleus by the positive charge of the protons. Therefore, atoms are charged neutral (have no charge).
From the below equation, which side is the product?
H2SO4 + NaOH > Na2SO4 + H20
The right side (Na2SO4 + H20)
A substance present before a chemical change
Reactant
How is the periodic table organised?
It is divided by its elemental group and ordered by its atomic number.
True or False. For a compound to be formed, do atoms need to be created and/or destroyed?
False. Chemical reactions describe the tendency for compounds to rearrange their structure to produce new combinations of atoms.
What are the 3 subatomic particles and where are they located?
Neutrons - inside the nucleus
Electrons - outside the nucleus
Protons - Inside the nucleus
True or False. Is the below equation balanced?
H2SO4 + 2NaOH > Na2SO4 + 2H20
True
What are the five signs of a chemical reaction?
1.Production of gas
2.Permanent colour change
3.Solid is formed out of a solution
4.A change in heat occurs (hotter or colder)
5.Light, sound, or electricity is produced