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WorksheetsRevision-Structure of Atom + Ecosystem
Total questions: 80
Worksheet time: 3600secs
. What did Democritus believe an atom was?
a tiny nucleus with electrons surrounding it
. a nucleus surrounded by an electron cloud
a tiny particle with a nucleus
a solid, indivisible object
. Why were Rutherford’s students surprised by the results of the gold foil experiment?
They didn’t expect the alpha particles to bounce back from the foil.
They didn’t expect the alpha particles to continue in a straight path.
They expected only a few alpha particles to bounce back from the foil.
They expected the alpha particles to be deflected by electrons.
Which determines the identity of an element?
. its mass number
its mass number B. the charge of the atom
the number of its neutrons
the number of its protons
The figure below shows which of the following?
two different elements
. two different ions
two different isotopes
two different protons
Which best describes an atom?
a particle with a single negative charge
a particle with a single positive charge
the smallest particle that still represents a compound
the smallest particle that still represents an element
Use the figure below to answer question.
What is Structure X?
an electron
a neutron
a nucleus
a proton
Whose model for the atom is shown
Bohr’s
Dalton’s
Rutherford’s
J. J. Thomson’s
What structure did Rutherford discover?
the atom
the electron
the neutron
the nucleus
. What is an atom mostly made of?
. air
empty space
neutrons
protons
Which of these are parts of the atom?
Protons, ProAthletes, Neutrons
Neutrons, Protons, Electrons
Mitochondria, Electrons, Protons
Oxygen
Which of these has a negative charge?
Proton
Neutron
Electron
Oatmeal
Where are electrons found?
Outside the nucleus
Inside the nucleus
Inside a proton
Which charge does a proton have?
Neutral
Negative
No charge- battery is dead
Positive
Neutrons have a ____________ charge.
Neutral, or no charge
Positive
Negative
Neutron? I don't know what that is!
True or false: Atoms make up everything around you.
True
False
What is the smallest unit of matter?
An element
A drop of water
A speck of dust
An atom
The subatomic particles are called:
protons, nucleus and electrons
protons, electrons and neutrons
protons, positives and negatives
cloud, shell and quarks
The picture shows a model of a helium atom and a lithium atom. Which of the following statements is true about the lithium and helium atoms?
Helium has more protons, neutrons, and electrons.
Lithium is much smaller than helium.
There is no difference between helium and lithium.
Lithium has more protons, neutrons, and electrons
If you want to identify an element, which piece of information would best help you identify it?
how many protons the element has
what charge the element has
how many neutrons the element has
how many electrons the element has
Within an atom, electrons
are inside the nucleus and are motionless
are outside the nucleus and are motionless
are in motion outside the nucleus
are in motion inside the nucleus
A copper wire is made of copper (Cu) atoms. Which of the following best describes the copper atoms?
They would be mostly the same, but some would have more protons than others.
They are all basically the same, but the number of neutrons could vary.
They are all exactly the same.
They each have different numbers of protons, neutrons, and electrons.
What is the atomic mass defined as?
What is the atomic mass of this atom?
1
3
4
7
The fluorine atom has an atomic number of
19
9
Elements that have _____________ are in the same group
physical properties
chemical properties
An atom has an atomic number of 15 and a mass number that rounds to 31. How many protons are there in the atom?
15
31
16
47
Which piece of equipment can be used for estimating the number of plants in an area?
Light meter
Pitfall trap
Quadrat
Moisture meter
How can a representative sample of the plant species growing in a field be obtained?
By randomly placing a quadrat at many different locations around the field
By randomly placing many quadrats in one corner of the field
By placing one quadrat at a random location in the field
Which sampling technique is this?
Quadrat
Line transect
Pitfall trap
Tree beating
Abiotic is non-living
Biodiversity, usually refers to
the same species in a general location
the number of different species in a given area
the number of animal species in a given area
the number of plant species in a given area
What is a native species?
a species that is brought to a place by humans and becomes part of the local ecosystem
an introduced species that has a negative impact on an ecosystem
a kind of organism that has been part of an ecosystem for a long time
a species that is critical for the overall health of an ecosystem
What is an invasive species?
a species that is brought to a place by humans and becomes part of the local ecosystem
an introduced species that has a negative impact on an ecosystem
a kind of organism that has been part of an ecosystem for a long time
a species that is critical for the overall health of an ecosystem
Biodiversity means..
The variety of life in an ecosystem
How an ecosystem changes over time
Differences among humans
Diversity of a select few species in a deserted area
When biodiversity increases
Sustainability decreases
Sustainability remains the same
Sustainability also increases
Sustainability becomes greater by 2
When biodiversity decreases
Sustainability also decreases
Sustainability remains the same
Sustainability increases
Sustainability is not impacted
Pollutants (Mercury, PCB, DDT's) are easily removed from aquatic ecosystems.
True
False
Chemical pollutants in Bioaccumulation effect which part of the food chain?
Micro-organisms/
Insects
Fish populations
All parts of the food chain are affected by Bioaccumulation
Predators/Humans
If a mouse eats poison, will it affect the snake's health when it eats the mouse.
True
False
Explain why the relative concentration of toxic substance is much higher in the otter than in the big fish.
The otters can remove toxic waste
The otters eat lots of big fish
The otters can eat other animals
The otters have low toxicity levels
Name one impact of increasing the concentration of toxic substances in an ecosystem.
The ecosystem will thrive
The ecosystem will disappear
There will be more organisms at lower levels
There will be loss of species and biodiversity
What are examples of toxins? (choose all that apply)
water
salt
pesticides
mercury
insecticides
In which organism would biomagnification be the most concentrated? (Remember the lab: Rabbits eat the grass, the snake eats the rabbit, the hawk eats the snake--the hawk is the apex predator)
grass
rabbit
snake
hawk
Pesticides and herbicides eventually show up in higher-level consumers (i.e. as you go up the food chain) due to
biomagnification
climate change
habitat destruction
bioaccumulation
Toxin concentrations _____________ as you go up the food chain.
do not change
increase
decrease
Pollutants (Mercury, PCB, DDT's) are easily removed from aquatic ecosystems.
True
False
If two balloons have the same charge, what will happen if you place them close to each other?
Nothing
They will be attracted
They will pop
They will push each other away.
the will move faster towards each other
they will move away from each other
they will move towards each other at a slow speed
Who discover the electron?
Dalton
Rutherford
Thomson
Bohr
What did Rutherford discover in his experiment?
nucleus
electrons
neutrons
protons
In which model are atoms imagined as tiny balls?
Dalton
Thomson
Rutherford
Bohr
What does atom mean?
small
visible
indivisible
particle
Rutherford's "gold-foil" experiment using alpha particle scattering concluded that
the center of the atom is empty
atomic mass is spread over the whole atom
the center of the atom has a negative charge
most of the atom is empty
Rutherford realized that the atomic nucleus was positively charged because
it attracted alpha particles.
it deflected alpha particles.
it had no effect on alpha particles.
it produced alpha particles.
What results did Rutherford observe in his Gold-Foil experiment?
He observed that all alpha particles did go through a gold-foil in straight lines
He observed that most alpha particles did not go through a gold-foil and stopped on one side of the gold foil.
He observed that a small number of alpha particles bounced off the gold-foil at very large angles
He observed that all alpha particles slightly deflected from the straight line when going through a gold-foil
Why did Ernest Rutherford and his colleagues perform the Gold-Foil Experiment?
They wanted to test and confirm the Plum-Pudding model
They wanted to test John Dalton's Model
They were looking for electrons
They wanted to come up with their own Atomic Model
This model was the first to show a nucleus, consisting of protons and neutron. Electrons surround the nucleus but are not shown in distinct energy levels.
The "Rutherford Model" of the atom
The "Plum Pudding Model" of the atom
The "Quantum Mechanical Modell" of the atom
Democritus's model of the atom
According to Dalton's atomic theory, all matter is made of ________.
Molecules
Protons, neutrons, and electrons
Atoms
Subatomic particles
Dalton proposed that all atoms of a given element are ________ in mass and properties.
Different
Similar
Identical
Varied
According to Dalton's atomic theory, a chemical reaction is ________.
The creation of new atoms
The destruction of atoms
The rearrangement of atoms
The conversion of atoms into energy
What is the law of conservation of mass?
Matter is not created or destroyed in a closed system
A pure compound will always have the same proportion of the same elements
Atoms are indivisible and solid spheres
A chemical reaction is a rearrangement of atoms
