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Worksheets8th grade Science EOG Review Part 1
Total questions: 20
Worksheet time: 15mins
Which is a compound?
hydrogen
air
sugar
calcium
Two different liquids are poured together. Bubbles and a mist forms. A few minutes later, the solution is weighed, and the weight is less than before the liquids were mixed. Why?
Atoms were destroyed in the mist.
Atoms became lighter when they turned into a gas.
Some atoms escaped into the air.
Some of the atoms became brand new substances that weigh less.
The decomposition of carbonic acid changes into water and carbon dioxide.
H2CO3 ------> H2O + CO2
Which statement is true?
The product is greater than the reactant
The product is less than the reactant
The product is equal to the reactant
The product destroyed the reactants.
Which of the following is classified as an element?
iron
Salt
water
air
Which best describes the seqence of the elements in Period 5 of the Periodic Table?
Highly reacive gases, relatively nonreactive metals, reactive gases, nonreactive metals
highly reacive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases
nonreactive gases, metalloids nonreactive metals, highly reactive metals, highly reactive gases
nonreactive gases, nonreactive metals, highly reactive metals, reactive gases
Chlorine has 7 valence electrons. With what group of elements will chlorine most readily bond?
Group 1
Group 2
Group 3
Group 17
Which is the best example of a chemical change?
balloon popping
crumpling up paper
water evaporating
a cake baking
Fill in the blanks to show a reaction that represents teh Law of Conservation of Mass.
(a) ---> (b)
2H2 + O2
2H2O
H +O
H2O
H2O2
A geologist identifies the identical index fossils in rock layers from 2 different areas. What can be concluded?
The deposition rate of the 2 layers was identical
The fossil organism evolved independently in the 2 separate layers
The two rock layers were deposited at approximately the same time.
The index fossils will also occur in sediment deposited on top of these layers.
Which supports the theory that the same mountains were once at the bottom of the ocean?
There are underwater mountains on the ocean floors today.
Freshwater rivers flow to the ocean
Fossils of marine organisms are found on top of some mountains
Moth mountains and ocean floors have similar minerals
Which is the most accurate method scientists use to predict the age of the earth?
Radioactive Dating
Relative Dating
Comparing the ages of fossils
investigating core samples
Which is the reason for scientists to study ice cores obtained in ice caps?
To study fossils
To stydy the age of dinosaurs
To study past climates
To study the solar system
Which best describes uniformitarianism?
The time it takes for erosion to occur has changed since Earh was first formed.
The movement of the continents no longer occurs because of ocean currents.
The processes that shape the earth continue as they hace since Earth was first formed
The formation of rock layers has slowed because of climate change.
What evidence supports that life on earth has continually evolved?
Evidence from tree rings
Evidence from rock layers, fossils, and ice cores
Evidence gathered from melting glaciers
Evidence that climate has changed over time.
Which would most likely increase the genetic variation in a population of an organism?
An increase in diseases
A decrease in diseases
An increase in mutations
A decrease in mutations
Which is the best evidence for evolution?
New rock layers containing fossils ofd simple organisms
New rock layers containing fossils unlike existing organisms
Old rock layers containing fossils unike existing organisms
Old rock layers containing fossils od complex organisms
Which best explains why mammals became dominant after the mass extinction of dinosaurs?
They had traits that allowed them to adapt and change to the environment.
They were bigger than dinosaurs.
They were able to hibernate for a long time.
They ate different foods than dinosaurs.
Which demonstrates how genetic variation may result from a change in an environment where an animal lives?
A slamon swims faster in cold water.
A snake increases body temperature when laying in the sun.
A beetle stands out to predators because its color is different than its surroundings.
An arctic fox changes it color over time because it migrates to a different climate.
If a bat, an alligator, and a bird evolved from a common ancestor, what can be concluded?
They have similar anatomical structures
They live in the same part of the world
They are in the same biological classification
They are able to survive changes in their environments
Recent changes in species can be found in the upper layers of rock. This privides a link between whch two scientific ideas?
Cell theory and the theory of evolution
The periodic nature of the elements and cell theory
the theory of evolution and the law of superposition
the law of superposition and the periodic nature of the elements
