_______can only be separated by a chemical reaction.
_______can only be separated by a chemical reaction.
_______can only be separated by a chemical reaction.
Steel is a metal that is made from iron and carbon. During the steel making process, iron & carbon are melted together, and the allowed to harden into a solid. The iron and the carbon DO NOT chemically react with each other. After the steel was made, 20 samples were taken from one piece and tested. Each sample contained 98% iron and 2% carbon.Which of the following terms BEST describes steel?
After a chemical reaction occurs in an open test tube, measurements indicate that the mass of the reactants is greater than the mass of the products remaining in the test tube. What most likely explains the measurements?
Describes the number of protons and neutrons in the nucleus of an atom.
What does the formula 6H2O2 mean?
When magnesium (Mg) metal is burned in the presence of oxygen (O), magnesium oxide is produced. The properties of magnesium oxide are different than the individual properties of magnesium and oxygen because magnesium oxide (MgO) is a(n)
Which pair of these geological activities are caused by movement of continental plates? 1.soil erosion 2.delta formation 3.chain of volcanoes 4.mountain formation
Scientists use radioactive dating to....
Fossils provide evidence for all of the following EXCEPT for....
Beneficial (helpful)____________ can lead to natural selection and a new organism.
The convergence of two continental plates would produce…
The _____________Era is when creation took place and life began.
Fossils are usually found in what type of rock?
What process is most responsible for the extinction of most species of plants and animals that have lived on Earth?
Which would least likely have an impact on global climate changes? Why?
Fossils left by ancient mammal species show that they had many of the same physical characteristics. What conclusion is supported by this evidence?
Some resources used to produce energy are considered non-renewable. Once they are used up, people will have to find other ways to make energy. Why will people have to find other energy resources rather than renewing the resources we already use?
Earth has limited resources from which to draw energy. Some resources cannot be easily renewed once they are depleted, or used up. Which energy resource can be used freely because it cannot be depleted?
Hydroelectric dams create nearly 20% of the world's electricity. They are also the cheapest way to create electricity. Once the dam is in place, there is limited cost to maintaining it and the source of the energy is renewable. What is one negative consequence of using dams to produce electricity?
Nuclear power plants can provide a large amount of energy to the communities they serve. What is one of the consequences of using nuclear power plants?
If we continue to use fossil fuels at the current rate of consumption, they will eventually run out. Which is not a way to prevent the depletion of our fossil fuel resources?
Which of the following would be classified as a renewable resource?
Which of the following is a property of a nonrenewable resource?
Which of the following energy sources would have the least ecological impact when used in the production of electricity?
Which would most likely cause a reduction in the amount of coal and natural gas on Earth?
Which is the best example of a pure substance?
Which statement best explains how periods on the periodic table are organized?
Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?
Which pair of elements has the most similar properties?
A scientist finds the bones of a dinosaur. What could help the scientist determine the approximate age of the dinosaur bones?
Which best describes how ice cores are important to the study of geologic history?
What do transitional fossils best support?
Scientists find dinosaur fossils in the bottom rock layers of a cliff and mammal fossils in the middle rock layer of the cliff. Which could best be concluded from this evidence?
Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis?
How does a balanced chemical equation satisfy the Law of Conservation of Mass?
Which statement best describes the Law of Superposition?
Which would indicate that a series of fossils represent the evolution of the horse?
Which is a problem with using wind turbines to produce energy?
What characteristic of aluminum allows it to be made into aluminum foil?
Which best explains how geologic time scales can help scientists study the evolution of life on Earth?
The theory of global warming is based on an increase of what atmospheric gas?
Process of determining the age of certain archeological artifacts of a biological origin (such as bone, cloth, wood and plant fibers) up to about 50,000 years old.
Collision between two of Earth's tectonic plates, where one plate sinks underneath the other plate
Body part in different species that is similar in function but not in structure.
Phase of matter in which atoms can collide and move past (flow) one another freely.
Describes the number of protons in the nucleus of an atom
Arrangement of elements according to their properties
Can be recognized only when substances undergo a change in composition.
Matter isn't created or destroyed during a chemical reaction; the atoms are just rearranged by chemical changes.
Finding a way to use a resource (or product from a resource) again without changing it or reprocessing it.
Organic material, which can be recycled and converted to energy; includes crops, crop wastes, trees, wood waste and animal waste.
Anything that takes up space; all things all made of
The theory that Earth's outer layer is made up of plates, which have moved throughout Earth's history.
Darwin's theory that the Earth's species have changed and diversified through time under the influence of natural selection.
Mixture that is not the uniform (same) throughout; parts can be visibly seen.
Resources that are extracted and used at a much faster rate than in which they were formed.