Atomic Structure
What is the charge of a electron?
Negative
What are valence electrons?
The number of electrons in the outermost shell
What does a group look like on the Periodic Table?
a column or straight up and down
How many elements are in C6H12O6?
3
Is melting butter for popcorn a chemical or physical change?
Physical
Which statement correctly describes the location and charge of the neutrons in an atom?
The neutrons are inside the nucleus and have a neutral charge.
How many valence electrons are in an element in group 15 in the periodic table?
5
Is Argon, Ar considered a metal, nonmetal or metalloid?
Nonmetal
The chemical formula for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?
1
How is a physical change different from a chemical change?
Chemical changes produce a new substance, physical changes stay the same substance.
What type of particles are found in the cloud surrounding the atom's nucleus?
Negatively charge particles only
How many valence electrons does Titanium, Ti have?
4
Are Helium, He and Argon, Ar in the same group or period?
Group
How many O's are in Al₂(SO₄)₃
12
How would you tell that a chemical change is occurring in this beaker? (show picture)
A gas is being produced.
Where is most of the mass in an atom located?
Nucleus
An element’s reactivity and other chemical properties are determined by the number of -
Valence electrons
Which two atoms are elements in the same group in the periodic table? (show picture)
Atom 1 and Atom 4
What combination of beads should the use to model the formula? Blue represents carbon, green represent oxygen and red represent hydrogen. (show picture)
12 red, 6 blue and 6 green
Which one is NOT a sign that a chemical reaction has occurred?
-precipitate
-energy change
-unexpected color change
-dissolving
Dissolving
If an element has an atomic number of 24 and an atomic mass of 47. How many neutrons does the atom have?
23
What determines the identity of a element?
Protons
Using your periodic table, what element is in the third period and group 5A (15)?
P, Phosphorus
Which of these formulas contain equal numbers of nitrogen atoms? (show picture)
Formulas I, II and V
During an investigation, two flasks of unknown, clear liquids are combined in a beaker and the following observations are recorded. Which of the listed observations indicate a new substance was formed during this investigation?
I. Solution color remains clear
II. The amount of solution in the beaker increased
III. Solution temperature changed from 10 degrees C to 20 degrees C
IV. Some of the liquid remained in the flasks
III ONLY