How to Count Atoms
Ionic Compounds
Molecular Compounds
Chemical Equations
mystery box
100
How do you determine the number of electrons in an element?
Use the periodic table!
100
Which atoms lose electrons?
Metals.
100
What are molecular compounds made of?
Non-metals.
100
How many electrons and how many protons does an Al3+ ion contain?
10 electrons and 10 protons
100
47
How many protons does a silver atom have?
200
A subscript outside a bracket does what?
A subscript outside a bracket multiplies all the elements inside the brackets.
200
Define the term 'ion'.
A charged atom in which the number of elcetrons is different from the number of protons.
200
How do molecular compounds form?
When electrons are shared between two non-metals.
200
What are the three (3) forms of chemical equations?
1. Word Equations 2. Skeleton Equations 3. Balanced Chemical Equations
200
valance electrons only
what does a Lewis diagram show?
300
What is a subscript?
A subcript is a number written at the lower right corner behind the symbol of an element. If there is more than one atom of the element in the molecule, then a subscript is used to indicate the number of atoms.
300
What is Ionic Bonding? Give an example.
Ionic bonding occurs when a metal transfers one or more electrons to a non-metal in an effort to attain a stable octet of electrons. For example, the transfer of an electron from sodium to chlorine can be depicted by a Lewis Dot Diagram.
300
How is a covalent bong formed?
When electrons are shared between two atoms. The combining capacity of a non-metal the number of bonds it will need to form a stable molecule (have a full shell of electrons).
300
Write a word equation using hydrogen and oxygen as the reactants. Explain.
hydrogen + oxygen -> water Hydrogen and oxygen react to form H20 (water).
300
what is the nucleus of an atom made up of?
protons and neutrons
400
What is a coefficient?
A coefficient is a number written in front of a chemical symbol that indicates the number of atoms of that element. It also indicates the number of molecules of that compound. A coefficient multiplies the number of atoms of each element in the formula.
400
What are the steps of writing formulas for Ionic Compounds?
1. Write the element symbols with the metal first. 2. Using a periodic table write the ionic charges above each symbol (the charge of the ion when it has a full outer shell of electrons) 3. Criss-cross the numbers only (not the charges) making them subscripts. 4. Write the formula.
400
What are the steps for writing formulas for molecular compounds?
1. Look at the name of the molecular compound. Use the periodic table to find symbols for the elements. 2. Compare the prefixs in the name to the table to determine the number of atoms of each element present. 3. Write in the subscripts, and write the chemical formula. Do not reduce the subscripts!
400
What is a Balanced Chemical Equation?
Balanced chemical equations demonstrate the law of conservation of mass. Each element has the same number of atoms on both sides of the chemical equation. Coefficients show how many units of a substance are involved in the reaction.
400
what is the formula for iron(III) oxide?
Fe203
M
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n
u