Chemical Symbols
An element has an atomic number of 8. What element is it?
oxygen
In the formula 3H₂O, how many Oxygen atoms are there?
What is 3
Where is the coeffcient located?
in the front
Compound is two or more substances combined
True
can an elements be broken down into simpler substances using ordinary chemical reactions?
Nope
In the compound CHO₂C, how many total atoms are present?
What is 4
Where are the subscripts located
bottom right of element
Molecules are made of the same element
true
(-200 or +200 )
A mystery substance contains 2 hydrogen atoms and 1 oxygen atom in every molecule. It can be separated into hydrogen and oxygen only through a chemical reaction.
is the substance an element, compound, or mixture. Explain how you know
compound. It contains two different elements that are chemically bonded in a fixed ratio of 2:1.
What is the chemical symbol for Silicon?
Si
In the chemical formula C₆H₁₂O₆, how many total atoms are present?
What is 24
Where are the products located
to the right
Pure substances are able to be broken down?
False
Mystery Substance: C2H5OH (+300 or -300)
1. How many different elements are present
2. how many total atoms are present in one molecule?
3. Is it an element of compound?
1. 3 elements- carbon, hydrogen, and oxygen
2. 9 total atoms-2 C+6 H+1 O
3. compound
an unknown substance contains only one type of atom. Is it automatically a compound?
no it is an element
How total atoms are in the formula 2N₂H₄?
What is 12?
where are the reactants located
left side
A substance contains hydrogen and oxygen atoms that are chemically bonded. is it an element or compound?
compound
What is the significance of the coefficient in a chemical formula?
Number of Molecules
In the formula 3MgCl₂S, how many total atoms are in the compound?
What is 12
What do the numbers in front of chemical formulas tell you?
a. the number of elements
b. the number of molecules or atoms involved
c. the atomic number
d. the mass of the element
B
What is the Law of Conservation of Mass