Atomic Basics
An atom's nucleus contains -
a) only protons
b) only neutrons
c) protons and neutrons
d) protons and electrons
C) protons and neutrons
A student conducted research. Based on the notes shown, what was the student researching?
- can be represented by chemical symbols
- are a form of matter made up of one type of atom.
a) Elements
b) Atoms
c) Molecules
d) Compounds
a) Elements
The small number written to the right of an element's symbol in a chemical formula is called the -
a) element of number
b) subscript
c) coefficient
d) postscript
b) subscript
Most of Earth's atmosphere is most up of what two elements?
a) Hydrogen and oxygen
b) Nitrogen and oxygen
c) Carbon and hydrogen
d) Hydrogen and carbon
b) Nitrogen and oxygen
Where are electrons located?
The electron cloud
When two or more atoms of different elements combine, they form a -
a) stable element
b) compound
c) neutron cloud
d) nucleus
b) compound
Which molecule contains three different elements?
a) NaOH
b) NaCl
c) CaCl2
d) SiO2
a) NaOH
Zn + Cucl2 --> ZnCl2 + Cu
What does the chemical equation above show?
a) New atoms can be created in a chemical reaction.
b) New compounds can be created in a chemical reaction.
c) New elements can be created during a chemical reaction.
d) Elements can be destroyed during a chemical reaction.
b) New compounds can be created in a chemical reaction.
Which element is the most abundant in Earth's crust?
a) iron
b) oxygen
c) silicon
d) aluminum
b) oxygen
How can you determine the number of protons, electrons, and neutrons in an element?
A. By counting how many letters are in the element’s name
B. By using the element’s atomic number and atomic mass on the periodic table
C. By looking at whether the element is a metal or nonmetal
D. By finding where the element is located on Earth
B. By using the element’s atomic number and atomic mass on the periodic table
A student conducted research. Based on the notes shown, what was the student researching?
- contains 3 subatomic particles
- are the building block of all matter
a) Elements
b) Atoms
c) Molecules
d) Compounds
B) Atoms
Which is considered a molecule and a compound?
a) H
b) H2O
c) O
d) H2
d) H2
What are the atoms and the new substance called in this chemical process?
HCl + NaOH --> NaCl + H2O
One word will not be used: equation, reactants, process, products
Reactants --> Products
Which element is commonly found in sand and many rocks?
a) gold
b) silicon
c) carbon
d) hydrogen
b) silicon
Which of the following is an element?
a) Water
b) Salt
c) Oxygen
d) Sugar
c) Oxygen
Which part of the atom is responsible for creating bonds that hold atoms together in molecules?
a) protons
b) neutrons
c) electrons
d) nucleus
c) electrons
How many electrons are in one atom of the element oxygen?
8
A student wrote this equation.
NaOH + HCl --> NaCl + H2O
What does the arrow symbol mean?
a) to add heat
b) to evaporate
c) to yield or make
d) to mix or dissolve
c) to yield or make
Which two elements make up the compound water?
Hydrogen and Oxygen (H2O)
What is the electrical charge for each subatomic particle?
Proton - positive (+)
Neutron - neutral or no charge
Electron - negative (-)
Which would be the best description of the nucleus of an atom?
a) The atom's nucleus takes up the most space and contains very little of the atom's mass.
b) The atom's nucleus takes up the most space and contains almost all of the atom's mass.
c) The atom's nucleus takes up very little and contains very little of the atom's mass.
d) The atom's nucleus takes up very little space and contains almost all of the atom's mass.
d) The atom's nucleus takes up very little space and contains almost all of the atom's mass.
Pick two answers: What makes each element on the periodic table unique and identifiable?
a) Atomic Mass Number
b) Chemical Symbol
c) Number of protons
d) Number of neutrons
A common sedimentary rock found in Virginia is limestone, also called calcium carbonate. The chemical formula for calcium carbonate is CaCO3. The subscript 3 represents the number of -
a) atoms of oxygen in calcium carbonate.
b) total molecules of calcium carbonate.
c) atoms of calcium carbonate.
d) molecules of carbon in calcium carbonate.
a) atoms of oxygen in calcium carbonate.
Which two elements make up the compound table salt?
Sodium and Chlorine
The chemical formula for baking soda or sodium bicarbonate is NaHCO3. How many atoms are present in one molecule of baking soda?
6