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WorksheetsFall 23-24 DCA
Total questions: 47
Worksheet time: 35mins
The nucleus of an atom contains which subatomic particles?
protons and electrons
protons and neutrons
electrons and neutrons
protons, electrons, and neutrons
Which subatomic particle has a negative charge?
proton
neutron
electron
cybertron
An atom has 12 protons, 14 neutrons, and 12 electrons. What is the atomic number of this element?
24
26
12
38
The picture shows part of the periodic table. Which pair of elements are in the same period?
La and Ru
Ra and Sg
Y and Os
K and Mg
How many atoms of oxygen are in a molecule of glucose (C6H12O6)?
4
6
12
24
How many elements are in C6H12O6?
1
2
3
4
How many valence electrons does the atom of Carbon-14, shown above have?
14
10
6
4
How many valence electrons does Helium have?
1
2
3
4
5
How many valence electrons does Nitrogen have?
1
2
3
4
5
What type of particles are found in the cloud surrounding the atom's nucleus?
Neutral particles and positively charge particles
Positive charge particles only
Negatively charge particles and positively charge particles
Negatively charge particles only
How many atoms in all are found in the compound above?
3
4
5
6
How many elements are in C6H12O6?
1
2
3
4
Sodium sulfate is used in laundry detergent. It is a compound that contains 2 atoms of sodium, 1 atom of sulfur, and 4 atoms of oxygen. What is the correct chemical formula for sodium sulfate?
NA2SO4
Na2S2O4
Na2SO4
Na2SO8
An atom of which element is represented by this model?
Carbon (C)
Neon (Ne)
Sodium (Na)
Boron (B)
An atom consists of 12 protons, 12 electrons, and 12 neutrons. Which of the following can be used to identify the element?
Neutrons
Electrons
Atomic number
Atomic mass
A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?
The number of neutrons
The number of protons
The location of valence electrons
The number of valence electrons
Four students were asked to name the parts of an atom that determine the atom’s identity and chemical properties. The students’ responses are shown in the table below.
Student 1
Student 2
Student 3
Student 4
How many valence electrons does the atom of Carbon-14, shown above have?
14
10
6
4
An element’s reactivity and other chemical properties are determined by the number of -
isotopes it has.
oxidation states.
valence electrons.
orbitals in an atom.
What would be true if the rabbit population increased?
The bacteria population will decrease
The hawk population would increase
There may be increases in wolves, hawks, and snakes.
Grasshopper populations would increase
What could be changed about the food web to make it more accurate?
Remove bacteria because they are not in the forest
Change arrows to go in opposite direction
Show arrows going from all organisms to fungi and bacteria
Draw arrows from the Sun to all organisms
Which abiotic factor(s) do plants compete for in order to make their own food?
water ONLY
sunlight ONLY
wind ONLY
water AND sunlight
Which is a true statement?
Biotic factors only rely on abiotic factors to survive.
Abiotic factors include all living things in the ecosystem.
Abiotic factors include sun, water, and plants.
Biotic and abiotic factors are both necessary for a sustainable ecosystem.
Which is MOST likely to happen if a large number of phytoplankton are killed from runoff entering the ocean?
The number of zooplankton would increase
The number of salmon would probably decrease
The number of porpoises would probably stay the same
The Sun would probably not emit as much energy
What conclusion could you make based on the graph?
Nitrogen is NOT a problem in the Gulf of Mexico
Corn and soybeans are the only sources of Nitrogen pollution
Most nitrogen pollution found in the Gulf comes from farming crops.
Nitrogen that comes from the atmosphere is most harmful.
an inherited characteristic that increases an organism's chance of survival
biodiversity
environmental change
adaptation
Giant salvinia is an aquatic plant that floats on water and reproduces rapidly. When these plants die, decomposition by bacteria affects oxygen levels in the water. As more plants die, less oxygen is available in the water. Students observe a pond covered by giant salvinia.
Which statement is the best prediction the students can make about the immediate future of the pond?
The depth of the water in the pond will increase.
Fish populations in the pond will begin to decrease.
The amount of bacteria in the pond will suddenly decrease.
The number of different types of plants around the pond will increase.
Which organisms in the food web shown above compete for the same food source in this environment?
Grasshoppers and snakes
Hawks and frogs
Frogs and snakes
Decomposers and grasses
This diagram shows the variety of organisms that live in different tide zones. Mussels are common organisms that compete for space in intertidal (middle) tide zones. If all of the mussels were removed from zone A, which organisms would likely compete for the space in Zone A?
Periwinkle and Limpets
Sea lettuce and Chiton
Sea urchins and Hermit crabs
Rock louse and Periwinkle
What is an example of how organisms respond to short term changes in the environment?
Animals tend to eat a lot more.
Animals will hibernate.
Animals must be able to adapt to a new environment.
Animals will go extinct or die due to the short term change.
A type of environmental change where changes occur quickly and do not give time for organisms to develop adaptations, which can sometimes lead to die-offs or extinctions.
Long-term
Short-term
Segment A-B The bus is _________________.
at rest
returning (to original position)
moving forward
Segment O-A The bus is _________________.
at rest
returning (to original position)
moving forward
Which runner won the race?
Albert
Bob
Charlie
