Middle School Physical Science : Middle School Physical Science
Study concepts, example questions & explanations for Middle School Physical Science
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Example Questions
Example Question #1 : Describe Atomic Composition
Protons have what kind of charge?
variable
neutral
negative
positive
positive
The answer is positive.
Protons have a positive charge.
Neutrons have a neutral charge.
Electrons have a negative charge.
Example Question #2 : Describe Atomic Composition
Neutrons have what kind of charge?
positive
negative
neutral
variable
neutral
The answer is neutral.
Protons have a positive charge.
Neutrons have a neutral charge.
Electrons have a negative charge.
Example Question #3 : Describe Atomic Composition
Electrons have what kind of charge?
variable
negative
positive
neutral
negative
The answer is negative.
Protons have a positive charge.
Neutrons have a neutral charge.
Electrons have a negative charge.
Example Question #1 : Describe Atomic Composition
Where are the protons and neutrons located in an atom?
the nucleus
attached to proteins
the electron cloud
inside the cell wall
the nucleus
Atoms are made of smaller particles called protons, neutrons, and electrons. Protons and neutrons exist in the atom's nucleus, while electrons exist in the electron cloud. The answer is not cells because cells are a building block of organisms and are made of atoms.
Example Question #2 : Describe Atomic Composition
What is the overall charge of the atom in the image shown?
negative, -1
positive, +2
positive, +1
neutral, or zero charge
neutral, or zero charge
The overall charge of the atom is neutral. The atom has two positively charged protons and two negatively charged electrons which result in a net charge of zero. The neutron does not have a charge.
Example Question #6 : Describe Atomic Composition
The atomic number of an atom is equal to the number of _________ in an atom.
electrons
protons
neutrons
all the subatomic particles added together
protons
The atomic number of an atom is equal to the number of protons in an atom. If the number of protons changes, it is a different element and therefore has a different atomic number.
Example Question #7 : Describe Atomic Composition
Which answer choice is NOT part of an atom?
neutrons
electrons
cells
protons
cells
Atoms are made of smaller particles called protons, neutrons, and electrons. Protons and neutrons exist in the atom's nucleus, while electrons exist in the electron cloud. The answer is not cells because cells are a building block of organisms and are made of atoms.
Example Question #3 : Describe Atomic Composition
An atom is_______
the smallest unit of matter.
a type of energy.
tiny particles that make up only living things.
a molecule of a chemical.
the smallest unit of matter.
Atoms are defined as the smallest unit of matter. They make up everything that takes up space, whether it is living or nonliving. A molecule is more than one atom combined, and therefore is not the same as a single atom. Energy is not made of atoms because it does not take up space.
Example Question #9 : Describe Atomic Composition
Which answer choice is the smallest?
atoms
electrons
neutrons
protons
electrons
Electrons are the smallest. An atom is made of smaller particles called protons, neutrons and electrons. Protons and Neutrons are roughly the same size and have a mass of one amu (atomic mass unit). Electrons are much smaller and have a mass of 0 amu.
Example Question #10 : Describe Atomic Composition
Which answer choice is the smallest?
elements
cells
molecules
atoms
atoms
Atoms are the smallest. Molecules are two or more atoms. Elements are many of the same type of atom. Cells are often referred to as "the smallest unit of life" because all living things are made of cells. However, cells are made of smaller particles like atoms and molecules as well.
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