What is the element symbol of Silicon? (must be written in correct format.
Si
How many valence electrons does Aluminum have?
3
Water boils at 100 degrees Celsius is an example of a _______ property.
physical
The MOST important subatomic particle to look at when determining chemical properties of an element is ___.
Valence electron
Using the periodic table and looking at elements 33, 34, 35, 52, and 53, which of the following statements is true?A. Selenium is most like Bromine.B. Iodine has more valence electrons than Tellurium.C. Bromine and Iodine have the same number of energy levels.D. Arsenic has more protons.
The atomic number of an element represents the number of ____________.
protons
What do you call the substance(s) before a
chemical reaction begins?
reactants
Where do you find the reactants written in a chemical equation?
To the left of the arrow
Lighting a match is an example of a ________ change.
chemical
What share properties of both metals and nonmetals?
metalloids
If a chemical equation is balanced, what law is it
following?
Law of conservation of mass
An element with the same number of valence electrons as Phosphorus is _____.
Nitrogen, Arsenic, Antimony, Bismuth
The group of elements that are the most reactive metals are in group number ____.
1 or 1A
The group of elements that are nonreactive gases are in group number _____.
18 or 8A
Ice melting is an example of a ___________ change.
physical
P4 + 5O22P2O5
What is the coefficient of the phosphorus molecule?
1
P4 + 5O22P2O5
What is the subscript of the phosphorus molecule?
4
Does this equation follow the law of conservation of mass?
3N2O5 + 3H2O 5HNO3
no
Does this equation follow the law of conservation of mass?
2HgO 2Hg + O2
yes
Which coefficients would balance the following equation? __ NaClO3 __ NaCl + __ 02
2, 2, 3
If 16 grams of oxygen are combined with 2 grams of hydrogen, how much water would be formed?